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6.166 2.093.584.235 1.077.546 1.474.952.85.869 1.132 2.037 1.132 3.368 0 .368-.014.733-.052 1.086.23.462.477 1.088.644 1.517 1.258.364 2.233 1.721 2.605 2.656a.832.832 0 0 1 .053.22v2.869a.641.641 0 0 1-.078.256ZM12.172 11h-.344a4.323 4.323 0 0 1-.355.508C10.703 12.455 9.555 13 7.965 13c-1.725 0-2.989-.359-3.782-1.259a2.005 2.005 0 0 1-.085-.104L4 11.741v6.585c1.435.779 4.514 2.179 8 2.179 3.486 0 6.565-1.4 8-2.179v-6.585l-.098-.104s-.033.045-.085.104c-.793.9-2.057 1.259-3.782 1.259-1.59 0-2.738-.545-3.508-1.492a4.323 4.323 0 0 1-.355-.508h-.016.016Zm.641-2.935c.136 1.057.403 1.913.878 2.497.442.544 1.134.938 2.344.938 1.573 0 2.292-.337 2.657-.751.384-.435.558-1.15.558-2.361 0-1.14-.243-1.847-.705-2.319-.477-.488-1.319-.862-2.824-1.025-1.487-.161-2.192.138-2.533.529-.269.307-.437.808-.438 1.578v.021c0 .265.021.562.063.893Zm-1.626 0c.042-.331.063-.628.063-.894v-.02c-.001-.77-.169-1.271-.438-1.578-.341-.391-1.046-.69-2.533-.529-1.505.163-2.347.537-2.824 1.025-.462.472-.705 1.179-.705 2.319 0 1.211.175 1.926.558 2.361.365.414 1.084.751 2.657.751 1.21 0 1.902-.394 2.344-.938.475-.584.742-1.44.878-2.497Z"></path><path d="M14.5 14.25a1 1 0 0 1 1 1v2a1 1 0 0 1-2 0v-2a1 1 0 0 1 1-1Zm-5 0a1 1 0 0 1 1 1v2a1 1 0 0 1-2 0v-2a1 1 0 0 1 1-1Z"></path> </svg> <div> <div class="color-fg-default h4">GitHub Copilot</div> Write better code with AI </div> </a></li> <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary d-flex flex-items-center Link--has-description pb-lg-3" data-analytics-event="{"location":"navbar","action":"security","context":"product","tag":"link","label":"security_link_product_navbar"}" href="https://github.com/features/security"> <svg aria-hidden="true" height="24" viewBox="0 0 24 24" version="1.1" width="24" data-view-component="true" class="octicon octicon-shield-check color-fg-subtle mr-3"> <path d="M16.53 9.78a.75.75 0 0 0-1.06-1.06L11 13.19l-1.97-1.97a.75.75 0 0 0-1.06 1.06l2.5 2.5a.75.75 0 0 0 1.06 0l5-5Z"></path><path d="m12.54.637 8.25 2.675A1.75 1.75 0 0 1 22 4.976V10c0 6.19-3.771 10.704-9.401 12.83a1.704 1.704 0 0 1-1.198 0C5.77 20.705 2 16.19 2 10V4.976c0-.758.489-1.43 1.21-1.664L11.46.637a1.748 1.748 0 0 1 1.08 0Zm-.617 1.426-8.25 2.676a.249.249 0 0 0-.173.237V10c0 5.46 3.28 9.483 8.43 11.426a.199.199 0 0 0 .14 0C17.22 19.483 20.5 15.461 20.5 10V4.976a.25.25 0 0 0-.173-.237l-8.25-2.676a.253.253 0 0 0-.154 0Z"></path> </svg> <div> <div class="color-fg-default h4">Security</div> Find and fix vulnerabilities </div> </a></li> <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary d-flex flex-items-center Link--has-description pb-lg-3" data-analytics-event="{"location":"navbar","action":"actions","context":"product","tag":"link","label":"actions_link_product_navbar"}" href="https://github.com/features/actions"> <svg aria-hidden="true" height="24" viewBox="0 0 24 24" version="1.1" width="24" data-view-component="true" class="octicon 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20H10.75A1.75 1.75 0 0 1 9 18.25v-1.465a.75.75 0 0 1 1.5 0v1.465c0 .138.112.25.25.25h5.5a.75.75 0 0 1 .53.22l2.72 2.72v-2.19a.75.75 0 0 1 .75-.75h2a.25.25 0 0 0 .25-.25v-9.5Z"></path> </svg> <div> <div class="color-fg-default h4">Discussions</div> Collaborate outside of code </div> </a></li> <li> <a class="HeaderMenu-dropdown-link d-block no-underline position-relative py-2 Link--secondary d-flex flex-items-center Link--has-description" data-analytics-event="{"location":"navbar","action":"code_search","context":"product","tag":"link","label":"code_search_link_product_navbar"}" href="https://github.com/features/code-search"> <svg aria-hidden="true" height="24" viewBox="0 0 24 24" version="1.1" width="24" data-view-component="true" class="octicon octicon-code-square color-fg-subtle mr-3"> <path d="M10.3 8.24a.75.75 0 0 1-.04 1.06L7.352 12l2.908 2.7a.75.75 0 1 1-1.02 1.1l-3.5-3.25a.75.75 0 0 1 0-1.1l3.5-3.25a.75.75 0 0 1 1.06.04Zm3.44 1.06a.75.75 0 1 1 1.02-1.1l3.5 3.25a.75.75 0 0 1 0 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calculation","anchor":"more-complex-calculation","htmlText":"More complex calculation"},{"level":5,"text":"Right Guard","anchor":"right-guard","htmlText":"Right Guard"},{"level":5,"text":"Left Guard","anchor":"left-guard","htmlText":"Left Guard"},{"level":5,"text":"Left Kern","anchor":"left-kern","htmlText":"Left Kern"},{"level":4,"text":"Indexed substitution using a different slot in the stream","anchor":"indexed-substitution-using-a-different-slot-in-the-stream","htmlText":"Indexed substitution using a different slot in the stream"},{"level":5,"text":"Myanmar Great Ya","anchor":"myanmar-great-ya","htmlText":"Myanmar Great Ya"},{"level":5,"text":"Advance for Ldot on U","anchor":"advance-for-ldot-on-u","htmlText":"Advance for Ldot on U"},{"level":3,"text":"def","anchor":"def","htmlText":"def"},{"level":4,"text":"python support","anchor":"python-support","htmlText":"python support"},{"level":3,"text":"kernpairs","anchor":"kernpairs","htmlText":"kernpairs"},{"level":2,"text":"Capabilities","anchor":"capabilities","htmlText":"Capabilities"},{"level":3,"text":"Permit classes on both sides of GSUB type 2 (multiple) and type 4 (ligature) lookups","anchor":"permit-classes-on-both-sides-of-gsub-type-2-multiple-and-type-4-ligature-lookups","htmlText":"Permit classes on both sides of GSUB type 2 (multiple) and type 4 (ligature) lookups"},{"level":4,"text":"Processing","anchor":"processing","htmlText":"Processing"},{"level":4,"text":"Example","anchor":"example","htmlText":"Example"},{"level":3,"text":"Support classes in alternate lookups","anchor":"support-classes-in-alternate-lookups","htmlText":"Support classes in alternate lookups"},{"level":3,"text":"groups.plist","anchor":"groupsplist","htmlText":"groups.plist"}],"lineInfo":{"truncatedLoc":"575","truncatedSloc":"412"},"mode":"file"},"image":false,"isCodeownersFile":null,"isPlain":false,"isValidLegacyIssueTemplate":false,"issueTemplate":null,"discussionTemplate":null,"language":"Markdown","languageID":222,"large":false,"planSupportInfo":{"repoIsFork":null,"repoOwnedByCurrentUser":null,"requestFullPath":"/silnrsi/feax/blob/main/docs/feaextensions.md","showFreeOrgGatedFeatureMessage":null,"showPlanSupportBanner":null,"upgradeDataAttributes":null,"upgradePath":null},"publishBannersInfo":{"dismissActionNoticePath":"/settings/dismiss-notice/publish_action_from_dockerfile","releasePath":"/silnrsi/feax/releases/new?marketplace=true","showPublishActionBanner":false},"rawBlobUrl":"https://github.com/silnrsi/feax/raw/refs/heads/main/docs/feaextensions.md","renderImageOrRaw":false,"richText":"\u003carticle class=\"markdown-body entry-content container-lg\" itemprop=\"text\"\u003e\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch1 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eFEA Extensions Current\u003c/h1\u003e\u003ca id=\"user-content-fea-extensions-current\" class=\"anchor\" aria-label=\"Permalink: FEA Extensions Current\" href=\"#fea-extensions-current\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThis document describes the functionality of \u003ccode\u003emakefea\u003c/code\u003e and lists the extensions to fea that are currently supported.\u003c/p\u003e\n\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003e\u003ca href=\"#generated-classes\"\u003eGenerated Classes\u003c/a\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003e\u003ca href=\"#variant-glyph-classes\"\u003eVariant glyph classes\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"#ligatures\"\u003eLigatures\u003c/a\u003e\u003c/li\u003e\n\u003c/ul\u003e\n\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"#statements\"\u003eStatements\u003c/a\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003e\u003ca href=\"#baseclass\"\u003ebaseclass\u003c/a\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003e\u003ca href=\"#cursive-attachment\"\u003eCursive Attachment\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"#mark-attachment\"\u003eMark Attachment\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"#ligature-attachment\"\u003eLigature Attachment\u003c/a\u003e\u003c/li\u003e\n\u003c/ul\u003e\n\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"#ifinfo\"\u003eifinfo\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"#ifclass\"\u003eifclass\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"#do\"\u003edo\u003c/a\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003e\u003ca href=\"#substatements\"\u003eSubStatements\u003c/a\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003e\u003ca href=\"#for\"\u003efor\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"#let\"\u003elet\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"#forlet\"\u003eforlet\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"#if\"\u003eif\u003c/a\u003e\u003c/li\u003e\n\u003c/ul\u003e\n\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"#examples\"\u003eExamples\u003c/a\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003e\u003ca href=\"#simple-calculation\"\u003eSimple calculation\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"#more-complex-calculation\"\u003eMore complex calculation\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"#right-guard\"\u003eRight Guard\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"#left-guard\"\u003eLeft Guard\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"#left-kern\"\u003eLeft Kern\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"#myanmar-great-ya\"\u003eMyanmar Great Ya\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"#advance-for-ldot-on-u\"\u003eAdvance for Ldot on U\u003c/a\u003e\u003c/li\u003e\n\u003c/ul\u003e\n\u003c/li\u003e\n\u003c/ul\u003e\n\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"#def\"\u003edef\u003c/a\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003e\u003ca href=\"#python-support\"\u003epython support\u003c/a\u003e\u003c/li\u003e\n\u003c/ul\u003e\n\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"#kernpairs\"\u003ekernpairs\u003c/a\u003e\u003c/li\u003e\n\u003c/ul\u003e\n\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"#capabilities\"\u003eCapabilities\u003c/a\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003e\u003ca href=\"#permit-classes-on-both-sides-of-gsub-type-2-multiple-and-type-4-ligature-lookups\"\u003ePermit classes on both sides of GSUB type 2 (multiple) and type 4 (ligature) lookups\u003c/a\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003e\u003ca href=\"#processing\"\u003eProcessing\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"#example\"\u003eExample\u003c/a\u003e\u003c/li\u003e\n\u003c/ul\u003e\n\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"#support-classes-in-alternate-lookups\"\u003eSupport classes in alternate lookups\u003c/a\u003e\u003c/li\u003e\n\u003cli\u003e\u003ca href=\"#groupsplist\"\u003egroups.plist\u003c/a\u003e\u003c/li\u003e\n\u003c/ul\u003e\n\u003c/li\u003e\n\u003c/ul\u003e\n\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eGenerated Classes\u003c/h2\u003e\u003ca id=\"user-content-generated-classes\" class=\"anchor\" aria-label=\"Permalink: Generated Classes\" href=\"#generated-classes\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003e\u003ccode\u003emakefea\u003c/code\u003e simplifies the hand creation of fea code by analysing the glyphs in the input font, particularly with regard to their names. Names are assumed to conform to the Adobe Glyph List conventions regarding \u003ccode\u003e_\u003c/code\u003e for ligatures and \u003ccode\u003e.\u003c/code\u003e for glyph variants.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eVariant glyph classes\u003c/h3\u003e\u003ca id=\"user-content-variant-glyph-classes\" class=\"anchor\" aria-label=\"Permalink: Variant glyph classes\" href=\"#variant-glyph-classes\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eIf a font contains a glyph with a final variant (there may be more than one listed for a glyph, in sequence) and also a glyph without that final variant, then \u003ccode\u003emakefea\u003c/code\u003e will create two classes based on the variant name: @c_\u003cem\u003evariant\u003c/em\u003e contains the glyph with the variant and @cno_\u003cem\u003evariant\u003c/em\u003e contains the glyph without the variant. The two lists are aligned such that a simple classes based replacement will change all the glyphs without the variant into ones with the variant.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eFor example, U+025B is an open e that occurs in some African languages. Consider a font that contains the glyphs \u003ccode\u003euni025B\u003c/code\u003e and \u003ccode\u003euni025B.smcp\u003c/code\u003e for a small caps version of the glyph. \u003ccode\u003emakefea\u003c/code\u003e will create two classes:\u003c/p\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\"@c_smcp = [uni025B.scmp];\n@cno_smcp = [uni025B];\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode\u003e@c_smcp = [uni025B.scmp];\n@cno_smcp = [uni025B];\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eIn addition, if this font contains two other glyphs \u003ccode\u003euni025B.alt\u003c/code\u003e, an alternative shape to \u003ccode\u003euni025B\u003c/code\u003e and \u003ccode\u003euni025B.alt.smcp\u003c/code\u003e, the small caps version of the alternate. \u003ccode\u003emakefea\u003c/code\u003e will create the following classes:\u003c/p\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\"@c_smcp = [uni025B.scmp uni025B.alt.smcp];\n@cno_smcp = [uni025B uni025B.alt];\n@c_alt = [uni025B.alt];\n@cno_alt = [uni025B];\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode\u003e@c_smcp = [uni025B.scmp uni025B.alt.smcp];\n@cno_smcp = [uni025B uni025B.alt];\n@c_alt = [uni025B.alt];\n@cno_alt = [uni025B];\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eNotice that the classes with multiple glyphs, while keeping the alignment, do not guarantee any particular order of the glyphs in one of the classes. Only that the other class will align its glyph order correctly. Notice also that \u003ccode\u003euni025B.alt.smcp\u003c/code\u003e does not appear in the \u003ccode\u003e@c_alt\u003c/code\u003e class. This latter behaviour may change.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eLigatures\u003c/h3\u003e\u003ca id=\"user-content-ligatures\" class=\"anchor\" aria-label=\"Permalink: Ligatures\" href=\"#ligatures\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eUnless instructed on the command line via the \u003ccode\u003e-L\u003c/code\u003e or \u003ccode\u003e--ligmode\u003c/code\u003e option, \u003ccode\u003emakefea\u003c/code\u003e does nothing special with ligatures and treats them simply as glyphs that may take variants. There are four ligature modes. The most commonly used is \u003ccode\u003e-L last\u003c/code\u003e. This says to create classes based on the last components in all ligatures. Thus if the font from the previous section also included \u003ccode\u003euni025B_acutecomb\u003c/code\u003e and the corresponding small caps \u003ccode\u003euni025B_acutecomb.smcp\u003c/code\u003e. We also need an \u003ccode\u003eacutecomb\u003c/code\u003e. If the command line included \u003ccode\u003e-L last\u003c/code\u003e, the generated classes would be:\u003c/p\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\"@c_smcp = [uni025B.scmp uni025B.alt.smcp uni025B_acutecomb.smcp];\n@cno_smcp = [uni025B uni025B.alt uni025B_acutecomb];\n@c_alt = [uni025B.alt];\n@cno_alt = [uni025B];\n@clig_acutecomb = [uni025B_acutecomb];\n@cligno_acutecomb = [uni025B];\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode\u003e@c_smcp = [uni025B.scmp uni025B.alt.smcp uni025B_acutecomb.smcp];\n@cno_smcp = [uni025B uni025B.alt uni025B_acutecomb];\n@c_alt = [uni025B.alt];\n@cno_alt = [uni025B];\n@clig_acutecomb = [uni025B_acutecomb];\n@cligno_acutecomb = [uni025B];\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eAnd if the command line option were \u003ccode\u003e-L first\u003c/code\u003e, the last two lines of the above code fragment would become:\u003c/p\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\"@clig_uni025B = [uni025B_acutecomb];\n@cligno_uni025B = [acutecomb];\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode\u003e@clig_uni025B = [uni025B_acutecomb];\n@cligno_uni025B = [acutecomb];\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003ewhile the variant classes would remain the same.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThere are two other ligaturemodes: \u003ccode\u003elastcomp\u003c/code\u003e and \u003ccode\u003efirstcomp\u003c/code\u003e. These act like \u003ccode\u003elast\u003c/code\u003e and \u003ccode\u003efirst\u003c/code\u003e, but in addition they say that any final variants must be handled differently. Instead of seeing the final variants (those on the last ligature component) as applying to the whole ligature, they are only to be treated as applying to the last component. To demonstrate this we need to add the nonsensical \u003ccode\u003eacutecomb.smcp\u003c/code\u003e. With either \u003ccode\u003e-L last\u003c/code\u003e or \u003ccode\u003e-L first\u003c/code\u003e we get the same ligature classes as above. (Although we would add \u003ccode\u003eacutecomb.smcp\u003c/code\u003e to the \u003ccode\u003e@c_smcp\u003c/code\u003e and \u003ccode\u003eacutecomb\u003c/code\u003e to \u003ccode\u003e@cno_smcp\u003c/code\u003e) With \u003ccode\u003e-L firstcomp\u003c/code\u003e we get:\u003c/p\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\"@c_smcp = [uni025B.scmp uni025B.alt.smcp acutecomb.smcp];\n@cno_smcp = [uni025B uni025B.alt acutecomb];\n@c_alt = [uni025B.alt];\n@cno_alt = [uni025B];\n@clig_uni025B = [uni025B_acutecomb uni025B_acutecomb.smcp];\n@cligno_uni025B = [acutecomb acutecomb.smcp];\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode\u003e@c_smcp = [uni025B.scmp uni025B.alt.smcp acutecomb.smcp];\n@cno_smcp = [uni025B uni025B.alt acutecomb];\n@c_alt = [uni025B.alt];\n@cno_alt = [uni025B];\n@clig_uni025B = [uni025B_acutecomb uni025B_acutecomb.smcp];\n@cligno_uni025B = [acutecomb acutecomb.smcp];\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eNotice the removal of \u003ccode\u003euni025B_acutecomb.smcp\u003c/code\u003e from \u003ccode\u003e@c_smcp\u003c/code\u003e, since \u003ccode\u003euni025B_acutecomb.smcp\u003c/code\u003e is considered by \u003ccode\u003e-L firstcomp\u003c/code\u003e to be a ligature of \u003ccode\u003euni025B\u003c/code\u003e and \u003ccode\u003eacutecomb.smcp\u003c/code\u003e there is no overall ligature \u003ccode\u003euni025B_acutecomb\u003c/code\u003e with a variant \u003ccode\u003e.smcp\u003c/code\u003e that would fit into \u003ccode\u003e@c_smcp\u003c/code\u003e. If we use \u003ccode\u003e-L lastcomp\u003c/code\u003e we change the last two classes to:\u003c/p\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\"@clig_acutecomb = [uni025B_acutecomb];\n@cligno_acutecomb = [uni025B];\n@clig_acutecomb_smcp = [uni025B_acutecomb.smcp];\n@cligno_acutecomb_smcp = [un025B];\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode\u003e@clig_acutecomb = [uni025B_acutecomb];\n@cligno_acutecomb = [uni025B];\n@clig_acutecomb_smcp = [uni025B_acutecomb.smcp];\n@cligno_acutecomb_smcp = [un025B];\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eWith any \u003ccode\u003e.\u003c/code\u003e in the variant being changed to \u003ccode\u003e_\u003c/code\u003e in the class name.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eIn our example, if the author wanted to use \u003ccode\u003e-L lastcomp\u003c/code\u003e or \u003ccode\u003e-L firstcomp\u003c/code\u003e, they might find it more helpful to rename \u003ccode\u003euni025B_acutecomb.smcp\u003c/code\u003e to \u003ccode\u003euni025B.smcp_acutecomb\u003c/code\u003e and remove the nonsensical \u003ccode\u003eacutecomb.smcp\u003c/code\u003e. This would give, for \u003ccode\u003e-L lastcomp\u003c/code\u003e:\u003c/p\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\"@c_smcp = [uni025B.scmp uni025B.alt.smcp];\n@cno_smcp = [uni025B uni025B.alt];\n@c_alt = [uni025B.alt];\n@cno_alt = [uni025B];\n@clig_acutecomb = [uni025B_acutecomb uni025B.smcp_acutecomb];\n@cligno_acutecomb = [uni025B uni025B.smcp];\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode\u003e@c_smcp = [uni025B.scmp uni025B.alt.smcp];\n@cno_smcp = [uni025B uni025B.alt];\n@c_alt = [uni025B.alt];\n@cno_alt = [uni025B];\n@clig_acutecomb = [uni025B_acutecomb uni025B.smcp_acutecomb];\n@cligno_acutecomb = [uni025B uni025B.smcp];\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eand for \u003ccode\u003e-L firstcomp\u003c/code\u003e, the last two classes become:\u003c/p\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\"@clig_uni025B = [uni025B_acutecomb];\n@cligno_uni025B = [acutecomb];\n@clig_uni025B_smcp = [uni025B.smcp_acutecomb];\n@cligno_uni025B_smcp = [acutecomb];\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode\u003e@clig_uni025B = [uni025B_acutecomb];\n@cligno_uni025B = [acutecomb];\n@clig_uni025B_smcp = [uni025B.smcp_acutecomb];\n@cligno_uni025B_smcp = [acutecomb];\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eStatements\u003c/h2\u003e\u003ca id=\"user-content-statements\" class=\"anchor\" aria-label=\"Permalink: Statements\" href=\"#statements\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003ebaseclass\u003c/h3\u003e\u003ca id=\"user-content-baseclass\" class=\"anchor\" aria-label=\"Permalink: baseclass\" href=\"#baseclass\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eA baseclass is the base equivalent of a markclass. It specifies the position of a particular class of anchor points on a base, be that a true base or a mark base. The syntax is the same as for a markclass, but it is used differently in a pos rule:\u003c/p\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\"markClass [acute] \u0026lt;anchor 350 0\u0026gt; @TOP_MARKS;\nbaseClass [a] \u0026lt;anchor 500 500\u0026gt; @BASE_TOPS;\nbaseClass b \u0026lt;anchor 500 750\u0026gt; @BASE_TOPS;\n\nfeature test {\n pos base @BASE_TOPS mark @TOP_MARKS;\n} test;\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode\u003emarkClass [acute] \u0026lt;anchor 350 0\u0026gt; @TOP_MARKS;\nbaseClass [a] \u0026lt;anchor 500 500\u0026gt; @BASE_TOPS;\nbaseClass b \u0026lt;anchor 500 750\u0026gt; @BASE_TOPS;\n\nfeature test {\n pos base @BASE_TOPS mark @TOP_MARKS;\n} test;\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eWhich is the functional equivalent of:\u003c/p\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\"markClass [acute] \u0026lt;anchor 350 0\u0026gt; @TOP_MARKS;\n\nfeature test {\n pos base [a] \u0026lt;anchor 500 500\u0026gt; mark @TOP_MARKS;\n pos base b \u0026lt;anchor 500 750\u0026gt; mark @TOP_MARKS;\n} test;\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode\u003emarkClass [acute] \u0026lt;anchor 350 0\u0026gt; @TOP_MARKS;\n\nfeature test {\n pos base [a] \u0026lt;anchor 500 500\u0026gt; mark @TOP_MARKS;\n pos base b \u0026lt;anchor 500 750\u0026gt; mark @TOP_MARKS;\n} test;\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eIt should be borne in mind that both markClasses and baseClasses can also be used as normal glyph classes and as such use the same namespace.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThe baseClass statement is a high priority need in order to facilitate auto generation of attachment point information without having to create what might be redundant lookups in the wrong order.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eGiven a set of base glyphs with attachment point A and marks with attachment point _A, makefea will generate the following:\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003ebaseClass A - containing all bases with attachment point A\u003c/li\u003e\n\u003cli\u003emarkClass _A - containing all marks with attachment point _A\u003c/li\u003e\n\u003cli\u003ebaseClass A_MarkBase - containing all marks with attachment point A\u003c/li\u003e\n\u003c/ul\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch4 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eCursive Attachment\u003c/h4\u003e\u003ca id=\"user-content-cursive-attachment\" class=\"anchor\" aria-label=\"Permalink: Cursive Attachment\" href=\"#cursive-attachment\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eCursive attachment involves two base anchors, one for the entry and one for the exit. We can extend the use of baseClasses to support this, by passing two baseClasses to the pos cursive statement:\u003c/p\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\"baseClass meem.medial \u0026lt;anchor 700 50\u0026gt; @ENTRIES;\nbaseClass meem.medial \u0026lt;anchor 0 10\u0026gt; @EXITS;\n\nfeature test {\n pos cursive @ENTRIES @EXITS;\n} test;\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode\u003ebaseClass meem.medial \u0026lt;anchor 700 50\u0026gt; @ENTRIES;\nbaseClass meem.medial \u0026lt;anchor 0 10\u0026gt; @EXITS;\n\nfeature test {\n pos cursive @ENTRIES @EXITS;\n} test;\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eHere we have two base classes for the two anchor points, and the pos cursive processing code works out which glyphs are in both classes, and which are in one or the other and generates the necessary pos cursive statement for each glyph. I.e. there will be statements for the union of the two classes but with null anchors for those only in one (according to which baseClass they are in). This has the added advantage that any code generating baseClasses does not need to know whether a particular attachment point is being used in a cursive attachment. That is entirely up to the user of the baseClass.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch4 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eMark Attachment\u003c/h4\u003e\u003ca id=\"user-content-mark-attachment\" class=\"anchor\" aria-label=\"Permalink: Mark Attachment\" href=\"#mark-attachment\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThe current mark attachment syntax is related to the base mark attachment in that the base mark has to be specified explicitly and we cannot currently use a markclass as the base mark in a mark attachment lookup. We can extend the mark attachment in the same way as we extend the base attachment, by allowing the mark base to be a markclass. Thus:\u003c/p\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\"pos mark @MARK_BASE_CLASS mark @MARK_MARK_CLASS;\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode\u003epos mark @MARK_BASE_CLASS mark @MARK_MARK_CLASS;\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eWould expand out to a list of mark mark attachment rules.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch4 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eLigature Attachment\u003c/h4\u003e\u003ca id=\"user-content-ligature-attachment\" class=\"anchor\" aria-label=\"Permalink: Ligature Attachment\" href=\"#ligature-attachment\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eLigature attachment involves all the attachments to a ligature in a single rule. Given a list of possible ligature glyphs, the ligature positioning rule has been extended to allow the use of baseClasses instead of the base anchor on the ligature. For a noddy example:\u003c/p\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\"baseClass a \u0026lt;anchor 200 200\u0026gt; @TOP_1;\nbaseClass fi \u0026lt;anchor 200 0\u0026gt; @BOTTOM_1;\nbaseClass fi \u0026lt;anchor 400 0\u0026gt; @BOTTOM_2;\nmarkClass acute \u0026lt;anchor 0 200\u0026gt; @TOP;\nmarkClass circumflex \u0026lt;anchor 200 0\u0026gt; @BOTTOM;\n\npos ligature [a fi] @BOTTOM_1 mark @BOTTOM @TOP_1 mark @TOP\n ligComponent @BOTTOM_2 mark @BOTTOM;\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode\u003ebaseClass a \u0026lt;anchor 200 200\u0026gt; @TOP_1;\nbaseClass fi \u0026lt;anchor 200 0\u0026gt; @BOTTOM_1;\nbaseClass fi \u0026lt;anchor 400 0\u0026gt; @BOTTOM_2;\nmarkClass acute \u0026lt;anchor 0 200\u0026gt; @TOP;\nmarkClass circumflex \u0026lt;anchor 200 0\u0026gt; @BOTTOM;\n\npos ligature [a fi] @BOTTOM_1 mark @BOTTOM @TOP_1 mark @TOP\n ligComponent @BOTTOM_2 mark @BOTTOM;\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003ebecomes\u003c/p\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\"pos ligature a \u0026lt;anchor 200 200\u0026gt; mark @TOP\n ligComponent \u0026lt;anchor NULL\u0026gt;;\npos ligature fi \u0026lt;anchor 200 0\u0026gt; mark @BOTTOM\n ligComponent \u0026lt;anchor 400 0\u0026gt; mark @BOTTOM;\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode\u003epos ligature a \u0026lt;anchor 200 200\u0026gt; mark @TOP\n ligComponent \u0026lt;anchor NULL\u0026gt;;\npos ligature fi \u0026lt;anchor 200 0\u0026gt; mark @BOTTOM\n ligComponent \u0026lt;anchor 400 0\u0026gt; mark @BOTTOM;\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eifinfo\u003c/h3\u003e\u003ca id=\"user-content-ifinfo\" class=\"anchor\" aria-label=\"Permalink: ifinfo\" href=\"#ifinfo\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThis statement initiates a block either of statements or within another block. The block is only processed if the ifinfo condition is met. ifinfo takes two parameters. The first is a name that is an entry in a fontinfo.plist. The second is a string containing a regular expression that is matched against the given value in the fontinfo.plist. If there is a match, the condition is considered to be met.\u003c/p\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\"ifinfo(familyName, \u0026quot;Doulos\u0026quot;) {\n\n# statements\n\n}\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode\u003eifinfo(familyName, \"Doulos\") {\n\n# statements\n\n}\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eNotice the lack of a \u003ccode\u003e;\u003c/code\u003e after the block close.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eifinfo acts as a kind of macro, this means that the test is executed in the parser rather than collecting everything inside the block and processing it later like say the \u003ccode\u003edo\u003c/code\u003e statement. Notice that if you want to do something more complex than a regular expression test, then you may need to use a \u003ccode\u003edo\u003c/code\u003e statement and the \u003ccode\u003einfo()\u003c/code\u003e function.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eifclass\u003c/h3\u003e\u003ca id=\"user-content-ifclass\" class=\"anchor\" aria-label=\"Permalink: ifclass\" href=\"#ifclass\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThis statement initiates a block either of statements or within another block. The block is only processed if the given @class is defined and contains at least one glyph.\u003c/p\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\"ifclass(@oddities) {\n\n# statements\n\n}\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode\u003eifclass(@oddities) {\n\n# statements\n\n}\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eNotice the lack of a \u003ccode\u003e;\u003c/code\u003e after the block close.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003edo\u003c/h3\u003e\u003ca id=\"user-content-do\" class=\"anchor\" aria-label=\"Permalink: do\" href=\"#do\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThe \u003ccode\u003edo\u003c/code\u003e statement is a means of setting variables and repeating statement groups with variable expansion. A \u003ccode\u003edo\u003c/code\u003e statement is followed by various substatements that are in effect nested statements. The basic structure of the \u003ccode\u003edo\u003c/code\u003e statement is:\u003c/p\u003e\n\u003cp dir=\"auto\"\u003e\u003ccode\u003edo\u003c/code\u003e \u003cem\u003esubstatement\u003c/em\u003e \u003cem\u003esubstatement\u003c/em\u003e \u003cem\u003e...\u003c/em\u003e [ \u003ccode\u003e{\u003c/code\u003e \u003cem\u003estatements\u003c/em\u003e \u003ccode\u003e}\u003c/code\u003e ]\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eWhere \u003cem\u003estatements\u003c/em\u003e is a sequence of FEA statements. Within these statements, variables may be referenced by preceding them with a \u003ccode\u003e$\u003c/code\u003e. Anything, including statement words, can be the result of variable expantion. The only constraints are:\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eThe item expands to one or more complete tokens. It cannot be joined to something preceding or following it to create a single name, token, whatever.\u003c/li\u003e\n\u003c/ul\u003e\n\u003cp dir=\"auto\"\u003eIn effect a \u003ccode\u003e{}\u003c/code\u003e type block following a \u003ccode\u003efor\u003c/code\u003e or \u003ccode\u003elet\u003c/code\u003e substatement is the equivalent of inserting the substatement \u003ccode\u003eif True;\u003c/code\u003e before the block.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch4 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eSubStatements\u003c/h4\u003e\u003ca id=\"user-content-substatements\" class=\"anchor\" aria-label=\"Permalink: SubStatements\" href=\"#substatements\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eEach substatement is terminated by a \u003ccode\u003e;\u003c/code\u003e. The various substatements are:\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch5 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003efor\u003c/h5\u003e\u003ca id=\"user-content-for\" class=\"anchor\" aria-label=\"Permalink: for\" href=\"#for\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThe \u003ccode\u003efor\u003c/code\u003e substatement is structured as:\u003c/p\u003e\n\u003cp dir=\"auto\"\u003e\u003ccode\u003efor\u003c/code\u003e \u003cem\u003evar\u003c/em\u003e \u003ccode\u003e=\u003c/code\u003e \u003cem\u003eglyphlist\u003c/em\u003e \u003ccode\u003e;\u003c/code\u003e\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThis creates a variable \u003cem\u003evar\u003c/em\u003e that will iterate over the \u003cem\u003eglyphlist\u003c/em\u003e.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eWith the addition of \u003ccode\u003eforlet\u003c/code\u003e (see below), there is also \u003ccode\u003eforgroup\u003c/code\u003e that is a synonym for the \u003ccode\u003efor\u003c/code\u003e substatement defined here.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch5 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003elet\u003c/h5\u003e\u003ca id=\"user-content-let\" class=\"anchor\" aria-label=\"Permalink: let\" href=\"#let\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThe \u003ccode\u003elet\u003c/code\u003e substatement executes a short python expression (via \u003ccode\u003eeval\u003c/code\u003e), storing the result in the given variable, or variable list. The structure of the substatement is:\u003c/p\u003e\n\u003cp dir=\"auto\"\u003e\u003ccode\u003elet\u003c/code\u003e \u003cem\u003evar\u003c/em\u003e [\u003ccode\u003e,\u003c/code\u003e \u003cem\u003evar\u003c/em\u003e]* \u003ccode\u003e=\u003c/code\u003e \u003cem\u003eexpression\u003c/em\u003e \u003ccode\u003e;\u003c/code\u003e\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThere are various python functions that are especially supported, along with the builtins. These are:\u003c/p\u003e\n\u003cmarkdown-accessiblity-table\u003e\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eFunction\u003c/th\u003e\n\u003cth\u003eParameters\u003c/th\u003e\n\u003cth\u003eDescription\u003c/th\u003e\n\u003c/tr\u003e\n\u003c/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eADVx\u003c/td\u003e\n\u003ctd\u003e\u003cem\u003eglyphname\u003c/em\u003e\u003c/td\u003e\n\u003ctd\u003eReturns the advanced width of the given glyph\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eallglyphs\u003c/td\u003e\n\u003ctd\u003e\u003c/td\u003e\n\u003ctd\u003eReturns a list of all the glyph names in the font\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAPx\u003c/td\u003e\n\u003ctd\u003e\u003cem\u003eglyphname\u003c/em\u003e, \"\u003cem\u003eapname\u003c/em\u003e\"\u003c/td\u003e\n\u003ctd\u003eReturns the x coordinate of the given attachment point on the given glyph\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAPy\u003c/td\u003e\n\u003ctd\u003e\u003cem\u003eglyphname\u003c/em\u003e, \"\u003cem\u003eapname\u003c/em\u003e\"\u003c/td\u003e\n\u003ctd\u003eReturns the y coordinate of the given attachment point on the given glyph\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003efeaclass\u003c/td\u003e\n\u003ctd\u003e\u003cem\u003eclassname\u003c/em\u003e\u003c/td\u003e\n\u003ctd\u003eReturns a list of the glyph names in a class as a python list\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003einfo\u003c/td\u003e\n\u003ctd\u003e\u003cem\u003efinfoelement\u003c/em\u003e\u003c/td\u003e\n\u003ctd\u003eLooks up the entry in the fontinfo plist and returns its value\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ekerninfo\u003c/td\u003e\n\u003ctd\u003e\u003c/td\u003e\n\u003ctd\u003eReturns a list of tuples (left, right, kern_value)\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eopt\u003c/td\u003e\n\u003ctd\u003e\u003cem\u003edefined\u003c/em\u003e\u003c/td\u003e\n\u003ctd\u003eLooks up a given -D/--define variable. Returns empty string if missing\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMINx\u003c/td\u003e\n\u003ctd\u003e\u003cem\u003eglyphname\u003c/em\u003e\u003c/td\u003e\n\u003ctd\u003eReturns the minimum x value of the bounding box of the glyph\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMINy\u003c/td\u003e\n\u003ctd\u003e\u003cem\u003eglyphname\u003c/em\u003e\u003c/td\u003e\n\u003ctd\u003eReturns the minimum y value of the bounding box of the glyph\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMAXx\u003c/td\u003e\n\u003ctd\u003e\u003cem\u003eglyphname\u003c/em\u003e\u003c/td\u003e\n\u003ctd\u003eReturns the maximum x value of the bounding box of the glyph\u003c/td\u003e\n\u003c/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMAXy\u003c/td\u003e\n\u003ctd\u003e\u003cem\u003eglyphname\u003c/em\u003e\u003c/td\u003e\n\u003ctd\u003eReturns the maximum y value of the bounding box of the glyph\u003c/td\u003e\n\u003c/tr\u003e\n\u003c/tbody\u003e\n\u003c/table\u003e\u003c/markdown-accessiblity-table\u003e\n\u003cp dir=\"auto\"\u003eSee the section on python in the \u003ccode\u003edef\u003c/code\u003e command section following.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch5 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eforlet\u003c/h5\u003e\u003ca id=\"user-content-forlet\" class=\"anchor\" aria-label=\"Permalink: forlet\" href=\"#forlet\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThe \u003ccode\u003efor\u003c/code\u003e substatement only allows iteration over a group of glyphs. There are situations in which someone would want to iterate over a true python expression, for example, over the return value of a function. The \u003ccode\u003eforlet\u003c/code\u003e substatement is structured identically to a \u003ccode\u003elet\u003c/code\u003e substatement, but instead of setting the variable once, the following substatements are executed once for each value of the expression, with the variable set to each in turn. For example:\u003c/p\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\"def optlist(*alist) {\n if len(alist) \u0026gt; 0:\n for r in optlist(*alist[1:]):\n yield [alist[0]] + r\n yield r\n else:\n yield alist\n} optlist;\n\nlookup example {\ndo\n forlet l = optlist(\u0026quot;uni17CC\u0026quot;, \u0026quot;@coeng_no_ro\u0026quot;, \u0026quot;[uni17C9 uni17CA]\u0026quot;, \u0026quot;@below_vowels\u0026quot;, \u0026quot;@above_vowels\u0026quot;);\n let s = \u0026quot; \u0026quot;.join(l)\n {\n sub uni17C1 @coeng_ro @base_cons $s uni17B8' lookup insert_dotted_circle;\n sub uni17C1 @base_cons $s uni17B8' lookup insert_dotted_circle;\n }\n} example;\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode\u003edef optlist(*alist) {\n if len(alist) \u0026gt; 0:\n for r in optlist(*alist[1:]):\n yield [alist[0]] + r\n yield r\n else:\n yield alist\n} optlist;\n\nlookup example {\ndo\n forlet l = optlist(\"uni17CC\", \"@coeng_no_ro\", \"[uni17C9 uni17CA]\", \"@below_vowels\", \"@above_vowels\");\n let s = \" \".join(l)\n {\n sub uni17C1 @coeng_ro @base_cons $s uni17B8' lookup insert_dotted_circle;\n sub uni17C1 @base_cons $s uni17B8' lookup insert_dotted_circle;\n }\n} example;\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThis examples uses a \u003ccode\u003edef\u003c/code\u003e statement as defined below. The example produces rules for each of the possible subsequences of the optlist parameters, where each element is treated as being optional. It is a way of writing:\u003c/p\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\"sub uni17C1 @base_cons uni17CC? @coeng_no_ro [uni17C9 uni17CA]? @below_vowels? @above_vowels? uni17B8' lookup insert_dotted_circle;\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode\u003esub uni17C1 @base_cons uni17CC? @coeng_no_ro [uni17C9 uni17CA]? @below_vowels? @above_vowels? uni17B8' lookup insert_dotted_circle;\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThe structure of a \u003ccode\u003eforlet\u003c/code\u003e substatement is:\u003c/p\u003e\n\u003cp dir=\"auto\"\u003e\u003ccode\u003eforlet\u003c/code\u003e \u003cem\u003evar\u003c/em\u003e [\u003ccode\u003e,\u003c/code\u003e \u003cem\u003evar\u003c/em\u003e]* \u003ccode\u003e=\u003c/code\u003e \u003cem\u003eexpression\u003c/em\u003e \u003ccode\u003e;\u003c/code\u003e\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eA \u003ccode\u003eforlet\u003c/code\u003e substatement has the same access to functions that the \u003ccode\u003elet\u003c/code\u003e statement has, included those listed above under \u003ccode\u003elet\u003c/code\u003e.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch5 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eif\u003c/h5\u003e\u003ca id=\"user-content-if\" class=\"anchor\" aria-label=\"Permalink: if\" href=\"#if\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThe \u003ccode\u003eif\u003c/code\u003e substatement consists of an expression and a block of statements. \u003ccode\u003eif\u003c/code\u003e substatements only make sense at the end of a sequence of substatements and are executed at the end of the \u003ccode\u003edo\u003c/code\u003e statement, in the order they occur but after all other \u003ccode\u003efor\u003c/code\u003e and \u003ccode\u003elet\u003c/code\u003e substatements. The expression is calculated and if the result is True then the \u003cem\u003estatements\u003c/em\u003e are expanded using variable expansion.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003e\u003ccode\u003eif\u003c/code\u003e \u003cem\u003eexpression\u003c/em\u003e \u003ccode\u003e;\u003c/code\u003e \u003ccode\u003e{\u003c/code\u003e \u003cem\u003estatements\u003c/em\u003e \u003ccode\u003e}\u003c/code\u003e\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThere can be multiple \u003ccode\u003eif\u003c/code\u003e substatements, each with their own block, in a \u003ccode\u003edo\u003c/code\u003e statement.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch4 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eExamples\u003c/h4\u003e\u003ca id=\"user-content-examples\" class=\"anchor\" aria-label=\"Permalink: Examples\" href=\"#examples\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThe \u003ccode\u003edo\u003c/code\u003e statement is best understood through some examples.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch5 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eSimple calculation\u003c/h5\u003e\u003ca id=\"user-content-simple-calculation\" class=\"anchor\" aria-label=\"Permalink: Simple calculation\" href=\"#simple-calculation\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThis calculates a simple offset shift and creates a lookup to apply it:\u003c/p\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\"do let a = -int(ADVx(\u0026quot;u16F61\u0026quot;) / 2);\n {\n lookup left_shift_vowel {\n pos @_H \u0026lt;$a 0 0 0\u0026gt;;\n } left_shift_vowel;\n }\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode\u003edo let a = -int(ADVx(\"u16F61\") / 2);\n {\n lookup left_shift_vowel {\n pos @_H \u0026lt;$a 0 0 0\u0026gt;;\n } left_shift_vowel;\n }\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eNotice the lack of iteration here.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch5 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eMore complex calculation\u003c/h5\u003e\u003ca id=\"user-content-more-complex-calculation\" class=\"anchor\" aria-label=\"Permalink: More complex calculation\" href=\"#more-complex-calculation\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThis calculates the guard spaces on either side of a base glyph in response to applied diacritics.\u003c/p\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\"lookup advance_base {\ndo for g = @H;\n let a = APx(g, \u0026quot;H\u0026quot;) - ADVx(g) + int(1.5 * ADVx(\u0026quot;u16F61\u0026quot;));\n let b = int(1.5 * ADVx(\u0026quot;u16F61\u0026quot;)) - APx(g, \u0026quot;H\u0026quot;);\n let c = a + b;\n {\n pos $g \u0026lt;$b 0 $c 0\u0026gt;;\n }\n} advance_base;\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode\u003elookup advance_base {\ndo for g = @H;\n let a = APx(g, \"H\") - ADVx(g) + int(1.5 * ADVx(\"u16F61\"));\n let b = int(1.5 * ADVx(\"u16F61\")) - APx(g, \"H\");\n let c = a + b;\n {\n pos $g \u0026lt;$b 0 $c 0\u0026gt;;\n }\n} advance_base;\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch5 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eRight Guard\u003c/h5\u003e\u003ca id=\"user-content-right-guard\" class=\"anchor\" aria-label=\"Permalink: Right Guard\" href=\"#right-guard\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eIt is often desirable to give a base character extra advance width to account for a diacritic hanging over the right hand side of the glyph. Calculating this can be very difficult by hand. This code achieves this:\u003c/p\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\"do for b = @bases;\n for d = @diacritics;\n let v = (ADVx(d) - APx(d, \u0026quot;_U\u0026quot;)) - (ADVx(b) - APx(b, \u0026quot;U\u0026quot;));\n if v \u0026gt; 0; {\n pos $b' $v $d;\n }\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode\u003edo for b = @bases;\n for d = @diacritics;\n let v = (ADVx(d) - APx(d, \"_U\")) - (ADVx(b) - APx(b, \"U\"));\n if v \u0026gt; 0; {\n pos $b' $v $d;\n }\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch5 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eLeft Guard\u003c/h5\u003e\u003ca id=\"user-content-left-guard\" class=\"anchor\" aria-label=\"Permalink: Left Guard\" href=\"#left-guard\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eA corresponding guarding of space for diacritics may be done on the left side of a glyph:\u003c/p\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\"do for b = @bases;\n for d = @diacritics;\n let v = APx(d, \u0026quot;_U\u0026quot;) - APx(b, \u0026quot;U\u0026quot;);\n if v \u0026gt; 0; {\n pos $b' \u0026lt;$v 0 $v 0\u0026gt; $d;\n }\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode\u003edo for b = @bases;\n for d = @diacritics;\n let v = APx(d, \"_U\") - APx(b, \"U\");\n if v \u0026gt; 0; {\n pos $b' \u0026lt;$v 0 $v 0\u0026gt; $d;\n }\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch5 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eLeft Kern\u003c/h5\u003e\u003ca id=\"user-content-left-kern\" class=\"anchor\" aria-label=\"Permalink: Left Kern\" href=\"#left-kern\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eConsider the case where someone has used an attachment point as a kerning point. In some context they want to adjust the advance of the left glyph based on the position of the attachment point in the right glyph:\u003c/p\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\"do for r = @rights;\n let v = APx(r, \u0026quot;K\u0026quot;); {\n pos @lefts' $v $r;\n pos @lefts' $v @diacritics $r;\n }\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode\u003edo for r = @rights;\n let v = APx(r, \"K\"); {\n pos @lefts' $v $r;\n pos @lefts' $v @diacritics $r;\n }\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch4 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eIndexed substitution using a different slot in the stream\u003c/h4\u003e\u003ca id=\"user-content-indexed-substitution-using-a-different-slot-in-the-stream\" class=\"anchor\" aria-label=\"Permalink: Indexed substitution using a different slot in the stream\" href=\"#indexed-substitution-using-a-different-slot-in-the-stream\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eSometimes it is necessary to perform a substution in one slot in the stream based on a different slot. In this case case we want to replace members of class @A with corresponding members of @A1 @A2, where @A2 is indexed identically to @A1.\u003c/p\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\"lookup splitA {\ndo forlet i,a = enumerate(feaclass('A'));\n let a1 = feaclass('A1')[i];\n let a2 = feaclass('A2')[i];\n {\n sub @A by $a1 $a2;\n }\n} splitA;\n\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode\u003elookup splitA {\ndo forlet i,a = enumerate(feaclass('A'));\n let a1 = feaclass('A1')[i];\n let a2 = feaclass('A2')[i];\n {\n sub @A by $a1 $a2;\n }\n} splitA;\n\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch5 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eMyanmar Great Ya\u003c/h5\u003e\u003ca id=\"user-content-myanmar-great-ya\" class=\"anchor\" aria-label=\"Permalink: Myanmar Great Ya\" href=\"#myanmar-great-ya\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eOne obscure situation is the Great Ya (U+103C) in the Myanmar script, that visual wraps around the following base glyph. The great ya is given a small advance to then position the following consonant glyph within it. The advance of this consonant needs to be enough to place the next character outside the great ya. So we create an A attachment point on the great ya to emulate this intended final advance. Note that there are many variants of the great ya glyph. Thus:\u003c/p\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\"do for y = @c103C_nar;\n for c = @cCons_nar;\n let v = APx(y, \u0026quot;A\u0026quot;) - (ADVx(y) + ADVx(c));\n if v \u0026gt; 0; {\n pos $y' $v $c;\n }\n\ndo for y = @c103C_wide;\n for c = @cCons_wide;\n let v = APx(y, \u0026quot;A\u0026quot;) - (ADVx(y) + ADVx(c));\n if v \u0026gt; 0; {\n pos $y' $v $c;\n }\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode\u003edo for y = @c103C_nar;\n for c = @cCons_nar;\n let v = APx(y, \"A\") - (ADVx(y) + ADVx(c));\n if v \u0026gt; 0; {\n pos $y' $v $c;\n }\n\ndo for y = @c103C_wide;\n for c = @cCons_wide;\n let v = APx(y, \"A\") - (ADVx(y) + ADVx(c));\n if v \u0026gt; 0; {\n pos $y' $v $c;\n }\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch5 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eAdvance for Ldot on U\u003c/h5\u003e\u003ca id=\"user-content-advance-for-ldot-on-u\" class=\"anchor\" aria-label=\"Permalink: Advance for Ldot on U\" href=\"#advance-for-ldot-on-u\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThis example mirrors that used in the proposed \u003ca href=\"/silnrsi/feax/blob/main/docs/feax_future.md#setadvance\"\u003e\u003ccode\u003esetadvance\u003c/code\u003e\u003c/a\u003e statement. Here we want to add sufficient advance on the base to correspond to attaching an u vowel which in turn has a lower dot attached to it.\u003c/p\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\"do for b = @cBases;\n for u = @cLVowels;\n let v = APx(b, \u0026quot;L\u0026quot;) - APx(u, \u0026quot;_L\u0026quot;) + APx(u, \u0026quot;LD\u0026quot;) - APx(\u0026quot;ldot\u0026quot;, \u0026quot;_LD\u0026quot;) + ADVx(\u0026quot;ldot\u0026quot;) - ADVx(b);\n if v \u0026gt; 0; {\n pos $b' $v $u ldot;\n }\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode\u003edo for b = @cBases;\n for u = @cLVowels;\n let v = APx(b, \"L\") - APx(u, \"_L\") + APx(u, \"LD\") - APx(\"ldot\", \"_LD\") + ADVx(\"ldot\") - ADVx(b);\n if v \u0026gt; 0; {\n pos $b' $v $u ldot;\n }\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003edef\u003c/h3\u003e\u003ca id=\"user-content-def\" class=\"anchor\" aria-label=\"Permalink: def\" href=\"#def\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThe \u003ccode\u003edef\u003c/code\u003e statement allows for the creation of python functions for use in \u003ccode\u003elet\u003c/code\u003e substatements of the \u003ccode\u003edo\u003c/code\u003e statement. The syntax of the \u003ccode\u003edef\u003c/code\u003e statement is:\u003c/p\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\"def \u0026lt;fn\u0026gt;(\u0026lt;param_list\u0026gt;) {\n ... python code ...\n} \u0026lt;fn\u0026gt;;\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode\u003edef \u0026lt;fn\u0026gt;(\u0026lt;param_list\u0026gt;) {\n ... python code ...\n} \u0026lt;fn\u0026gt;;\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThe \u003ccode\u003efn\u003c/code\u003e must conform to a FEA name (not starting with a digit, etc.) and is repeated at the end of the block to mark the end of the function. The parameter is a standard python parameter list and the python code is standard python code, indented as if under a \u003ccode\u003edef\u003c/code\u003e statement.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch4 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003epython support\u003c/h4\u003e\u003ca id=\"user-content-python-support\" class=\"anchor\" aria-label=\"Permalink: python support\" href=\"#python-support\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eHere and in \u003ccode\u003elet\u003c/code\u003e and \u003ccode\u003eforlet\u003c/code\u003e substatements, the python that is allowed to be executed is limited. Only a subset of functions from builtins is supported and the \u003ccode\u003e__\u003c/code\u003e may not occur in any attribute. This is to stop people escaping the sandbox in which python code is interpreted. The \u003ccode\u003emath\u003c/code\u003e and \u003ccode\u003ere\u003c/code\u003e modules are also included along with the functions available to a \u003ccode\u003elet\u003c/code\u003e and \u003ccode\u003eforlet\u003c/code\u003e substatement. The full list of builtins supported are:\u003c/p\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\"True, False, None, int, float, str, abs, bool, dict, enumerate, filter, hex, isinstance, len, list,\nmap, max, min, ord, range, set, sorted, sum, tuple, type, zip\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode\u003eTrue, False, None, int, float, str, abs, bool, dict, enumerate, filter, hex, isinstance, len, list,\nmap, max, min, ord, range, set, sorted, sum, tuple, type, zip\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003ekernpairs\u003c/h3\u003e\u003ca id=\"user-content-kernpairs\" class=\"anchor\" aria-label=\"Permalink: kernpairs\" href=\"#kernpairs\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThe \u003ccode\u003ekernpairs\u003c/code\u003e statement expands all the kerning pairs in the font into \u003ccode\u003epos\u003c/code\u003e statements. For example:\u003c/p\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\"lookup kernpairs {\n lookupflag IgnoreMarks;\n kernpairs;\n} kernpairs;\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode\u003elookup kernpairs {\n lookupflag IgnoreMarks;\n kernpairs;\n} kernpairs;\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eMight produce:\u003c/p\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\"lookup kernpairs {\n lookupflag IgnoreMarks;\n pos @MMK_L_afii57929 -164 @MMK_R_uniA4F8;\n pos @MMK_L_uniA4D1 -164 @MMK_R_uniA4F8;\n pos @MMK_L_uniA4D5 -164 @MMK_R_afii57929;\n pos @MMK_L_uniA4FA -148 @MMK_R_space;\n} kernpairs;\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode\u003elookup kernpairs {\n lookupflag IgnoreMarks;\n pos @MMK_L_afii57929 -164 @MMK_R_uniA4F8;\n pos @MMK_L_uniA4D1 -164 @MMK_R_uniA4F8;\n pos @MMK_L_uniA4D5 -164 @MMK_R_afii57929;\n pos @MMK_L_uniA4FA -148 @MMK_R_space;\n} kernpairs;\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eCurrently, kerning information is only available from .ufo files.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eCapabilities\u003c/h2\u003e\u003ca id=\"user-content-capabilities\" class=\"anchor\" aria-label=\"Permalink: Capabilities\" href=\"#capabilities\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003ePermit classes on both sides of GSUB type 2 (multiple) and type 4 (ligature) lookups\u003c/h3\u003e\u003ca id=\"user-content-permit-classes-on-both-sides-of-gsub-type-2-multiple-and-type-4-ligature-lookups\" class=\"anchor\" aria-label=\"Permalink: Permit classes on both sides of GSUB type 2 (multiple) and type 4 (ligature) lookups\" href=\"#permit-classes-on-both-sides-of-gsub-type-2-multiple-and-type-4-ligature-lookups\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eAdobe doesn't permit compact notation using groups in 1-to-many (decomposition) rules e.g:\u003c/p\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\" sub @AlefPlusMark by absAlef @AlefMark ;\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode\u003e sub @AlefPlusMark by absAlef @AlefMark ;\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eor many-to-1 (ligature) rules, e.g.:\u003c/p\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\" sub @ShaddaKasraMarks absShadda by @ShaddaKasraLigatures ;\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode\u003e sub @ShaddaKasraMarks absShadda by @ShaddaKasraLigatures ;\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThis is implemented in FEAX as follows.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch4 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eProcessing\u003c/h4\u003e\u003ca id=\"user-content-processing\" class=\"anchor\" aria-label=\"Permalink: Processing\" href=\"#processing\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eOf the four simple (i.e., non-contextual) substitution lookups, Types 2 and 4\nare the only ones using the 'by' keyword that have a \u003cem\u003esequence\u003c/em\u003e of glyphs or\nclasses on one side of the rule. The other side will, necessarily, contain a\nsingle term -- which Adobe currently requires to be a glyph. For convenience of\nexpression, we'll call the sides of the rule the \u003cem\u003esequence side\u003c/em\u003e and the \u003cem\u003esingleton side\u003c/em\u003e.\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eNon-contextual substitution\u003c/li\u003e\n\u003cli\u003eUses the 'by' keyword\u003c/li\u003e\n\u003cli\u003eSingleton side references a glyph class.\u003c/li\u003e\n\u003c/ul\u003e\n\u003cp dir=\"auto\"\u003eSuch rules are expanded by enumerating the singleton side class and the corresponding\nclass(es) on the sequence side and writing a set of Adobe-compliant rules to give\nthe same result. It is an error if the singleton and corresponding classes do\nnot have the same number of glyphs.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch4 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eExample\u003c/h4\u003e\u003ca id=\"user-content-example\" class=\"anchor\" aria-label=\"Permalink: Example\" href=\"#example\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eGiven:\u003c/p\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\" @class1 = [ g1 g2 ] ;\n @class2 = [ g1a g2a ] ;\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode\u003e @class1 = [ g1 g2 ] ;\n @class2 = [ g1a g2a ] ;\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003ethen\u003c/p\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\" sub @class1 gOther by @class2 ;\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode\u003e sub @class1 gOther by @class2 ;\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003ewould be rewritten as:\u003c/p\u003e\n\u003cdiv class=\"snippet-clipboard-content notranslate position-relative overflow-auto\" data-snippet-clipboard-copy-content=\" sub g1 gOther by g1a ;\n sub g2 gOther by g2a ;\"\u003e\u003cpre class=\"notranslate\"\u003e\u003ccode\u003e sub g1 gOther by g1a ;\n sub g2 gOther by g2a ;\n\u003c/code\u003e\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eSupport classes in alternate lookups\u003c/h3\u003e\u003ca id=\"user-content-support-classes-in-alternate-lookups\" class=\"anchor\" aria-label=\"Permalink: Support classes in alternate lookups\" href=\"#support-classes-in-alternate-lookups\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThe default behaviour in FEA is for a \u003ccode\u003esub x from [x.a x.b];\u003c/code\u003e to only allow a single glyph before the \u003ccode\u003efrom\u003c/code\u003e keyword. But it is often useful to do things like: \u003ccode\u003esub @a from [@a.lower @a.upper];\u003c/code\u003e. Feax supports this by treating the right hand side list of glyphs as a single list and dividing it equally by the list on the left. Thus if \u003ccode\u003e@a\u003c/code\u003e is of length 3 then the first 3 glyphs in the right hand list will go one each as the first alternate for each glyph in \u003ccode\u003e@a\u003c/code\u003e, then the next 3 go as the second alternate, and so on until they are all consumed. If any are left over in that one of the glyphs ends up with a different number of alternates to another, then an error is given.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003egroups.plist\u003c/h3\u003e\u003ca id=\"user-content-groupsplist\" class=\"anchor\" aria-label=\"Permalink: groups.plist\" href=\"#groupsplist\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eIf a .ufo file contains a \u003ccode\u003egroups.plist\u003c/code\u003e file, the groups declared there are propagated straight through to the output file and can be referenced within a source file.\u003c/p\u003e\n\u003c/article\u003e","renderedFileInfo":null,"shortPath":null,"symbolsEnabled":true,"tabSize":8,"topBannersInfo":{"overridingGlobalFundingFile":false,"globalPreferredFundingPath":null,"showInvalidCitationWarning":false,"citationHelpUrl":"https://docs.github.com/github/creating-cloning-and-archiving-repositories/creating-a-repository-on-github/about-citation-files","actionsOnboardingTip":null},"truncated":false,"viewable":true,"workflowRedirectUrl":null,"symbols":{"timed_out":false,"not_analyzed":false,"symbols":[{"name":"FEA Extensions Current","kind":"section_1","ident_start":2,"ident_end":24,"extent_start":0,"extent_end":23932,"fully_qualified_name":"FEA Extensions Current","ident_utf16":{"start":{"line_number":0,"utf16_col":2},"end":{"line_number":0,"utf16_col":24}},"extent_utf16":{"start":{"line_number":0,"utf16_col":0},"end":{"line_number":575,"utf16_col":0}}},{"name":"Generated Classes","kind":"section_2","ident_start":1602,"ident_end":1619,"extent_start":1599,"extent_end":6538,"fully_qualified_name":"Generated Classes","ident_utf16":{"start":{"line_number":40,"utf16_col":3},"end":{"line_number":40,"utf16_col":20}},"extent_utf16":{"start":{"line_number":40,"utf16_col":0},"end":{"line_number":130,"utf16_col":0}}},{"name":"Variant glyph classes","kind":"section_3","ident_start":1882,"ident_end":1903,"extent_start":1878,"extent_end":3326,"fully_qualified_name":"Variant glyph 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class="markdown-heading" dir="auto"><h1 tabindex="-1" class="heading-element" dir="auto">FEA Extensions Current</h1><a id="user-content-fea-extensions-current" class="anchor" aria-label="Permalink: FEA Extensions Current" href="#fea-extensions-current"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">This document describes the functionality of <code>makefea</code> and lists the extensions to fea that are currently supported.</p> <ul dir="auto"> <li><a href="#generated-classes">Generated Classes</a> <ul dir="auto"> <li><a href="#variant-glyph-classes">Variant glyph classes</a></li> <li><a href="#ligatures">Ligatures</a></li> </ul> </li> <li><a href="#statements">Statements</a> <ul dir="auto"> <li><a href="#baseclass">baseclass</a> <ul dir="auto"> <li><a href="#cursive-attachment">Cursive Attachment</a></li> <li><a href="#mark-attachment">Mark Attachment</a></li> <li><a href="#ligature-attachment">Ligature Attachment</a></li> </ul> </li> <li><a href="#ifinfo">ifinfo</a></li> <li><a href="#ifclass">ifclass</a></li> <li><a href="#do">do</a> <ul dir="auto"> <li><a href="#substatements">SubStatements</a> <ul dir="auto"> <li><a href="#for">for</a></li> <li><a href="#let">let</a></li> <li><a href="#forlet">forlet</a></li> <li><a href="#if">if</a></li> </ul> </li> <li><a href="#examples">Examples</a> <ul dir="auto"> <li><a href="#simple-calculation">Simple calculation</a></li> <li><a href="#more-complex-calculation">More complex calculation</a></li> <li><a href="#right-guard">Right Guard</a></li> <li><a href="#left-guard">Left Guard</a></li> <li><a href="#left-kern">Left Kern</a></li> <li><a href="#myanmar-great-ya">Myanmar Great Ya</a></li> <li><a href="#advance-for-ldot-on-u">Advance for Ldot on U</a></li> </ul> </li> </ul> </li> <li><a href="#def">def</a> <ul dir="auto"> <li><a href="#python-support">python support</a></li> </ul> </li> <li><a href="#kernpairs">kernpairs</a></li> </ul> </li> <li><a href="#capabilities">Capabilities</a> <ul dir="auto"> <li><a href="#permit-classes-on-both-sides-of-gsub-type-2-multiple-and-type-4-ligature-lookups">Permit classes on both sides of GSUB type 2 (multiple) and type 4 (ligature) lookups</a> <ul dir="auto"> <li><a href="#processing">Processing</a></li> <li><a href="#example">Example</a></li> </ul> </li> <li><a href="#support-classes-in-alternate-lookups">Support classes in alternate lookups</a></li> <li><a href="#groupsplist">groups.plist</a></li> </ul> </li> </ul> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Generated Classes</h2><a id="user-content-generated-classes" class="anchor" aria-label="Permalink: Generated Classes" href="#generated-classes"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto"><code>makefea</code> simplifies the hand creation of fea code by analysing the glyphs in the input font, particularly with regard to their names. Names are assumed to conform to the Adobe Glyph List conventions regarding <code>_</code> for ligatures and <code>.</code> for glyph variants.</p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Variant glyph classes</h3><a id="user-content-variant-glyph-classes" class="anchor" aria-label="Permalink: Variant glyph classes" href="#variant-glyph-classes"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">If a font contains a glyph with a final variant (there may be more than one listed for a glyph, in sequence) and also a glyph without that final variant, then <code>makefea</code> will create two classes based on the variant name: @c_<em>variant</em> contains the glyph with the variant and @cno_<em>variant</em> contains the glyph without the variant. The two lists are aligned such that a simple classes based replacement will change all the glyphs without the variant into ones with the variant.</p> <p dir="auto">For example, U+025B is an open e that occurs in some African languages. Consider a font that contains the glyphs <code>uni025B</code> and <code>uni025B.smcp</code> for a small caps version of the glyph. <code>makefea</code> will create two classes:</p> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="@c_smcp = [uni025B.scmp]; @cno_smcp = [uni025B];"><pre class="notranslate"><code>@c_smcp = [uni025B.scmp]; @cno_smcp = [uni025B]; </code></pre></div> <p dir="auto">In addition, if this font contains two other glyphs <code>uni025B.alt</code>, an alternative shape to <code>uni025B</code> and <code>uni025B.alt.smcp</code>, the small caps version of the alternate. <code>makefea</code> will create the following classes:</p> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="@c_smcp = [uni025B.scmp uni025B.alt.smcp]; @cno_smcp = [uni025B uni025B.alt]; @c_alt = [uni025B.alt]; @cno_alt = [uni025B];"><pre class="notranslate"><code>@c_smcp = [uni025B.scmp uni025B.alt.smcp]; @cno_smcp = [uni025B uni025B.alt]; @c_alt = [uni025B.alt]; @cno_alt = [uni025B]; </code></pre></div> <p dir="auto">Notice that the classes with multiple glyphs, while keeping the alignment, do not guarantee any particular order of the glyphs in one of the classes. Only that the other class will align its glyph order correctly. Notice also that <code>uni025B.alt.smcp</code> does not appear in the <code>@c_alt</code> class. This latter behaviour may change.</p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Ligatures</h3><a id="user-content-ligatures" class="anchor" aria-label="Permalink: Ligatures" href="#ligatures"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Unless instructed on the command line via the <code>-L</code> or <code>--ligmode</code> option, <code>makefea</code> does nothing special with ligatures and treats them simply as glyphs that may take variants. There are four ligature modes. The most commonly used is <code>-L last</code>. This says to create classes based on the last components in all ligatures. Thus if the font from the previous section also included <code>uni025B_acutecomb</code> and the corresponding small caps <code>uni025B_acutecomb.smcp</code>. We also need an <code>acutecomb</code>. If the command line included <code>-L last</code>, the generated classes would be:</p> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="@c_smcp = [uni025B.scmp uni025B.alt.smcp uni025B_acutecomb.smcp]; @cno_smcp = [uni025B uni025B.alt uni025B_acutecomb]; @c_alt = [uni025B.alt]; @cno_alt = [uni025B]; @clig_acutecomb = [uni025B_acutecomb]; @cligno_acutecomb = [uni025B];"><pre class="notranslate"><code>@c_smcp = [uni025B.scmp uni025B.alt.smcp uni025B_acutecomb.smcp]; @cno_smcp = [uni025B uni025B.alt uni025B_acutecomb]; @c_alt = [uni025B.alt]; @cno_alt = [uni025B]; @clig_acutecomb = [uni025B_acutecomb]; @cligno_acutecomb = [uni025B]; </code></pre></div> <p dir="auto">And if the command line option were <code>-L first</code>, the last two lines of the above code fragment would become:</p> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="@clig_uni025B = [uni025B_acutecomb]; @cligno_uni025B = [acutecomb];"><pre class="notranslate"><code>@clig_uni025B = [uni025B_acutecomb]; @cligno_uni025B = [acutecomb]; </code></pre></div> <p dir="auto">while the variant classes would remain the same.</p> <p dir="auto">There are two other ligaturemodes: <code>lastcomp</code> and <code>firstcomp</code>. These act like <code>last</code> and <code>first</code>, but in addition they say that any final variants must be handled differently. Instead of seeing the final variants (those on the last ligature component) as applying to the whole ligature, they are only to be treated as applying to the last component. To demonstrate this we need to add the nonsensical <code>acutecomb.smcp</code>. With either <code>-L last</code> or <code>-L first</code> we get the same ligature classes as above. (Although we would add <code>acutecomb.smcp</code> to the <code>@c_smcp</code> and <code>acutecomb</code> to <code>@cno_smcp</code>) With <code>-L firstcomp</code> we get:</p> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="@c_smcp = [uni025B.scmp uni025B.alt.smcp acutecomb.smcp]; @cno_smcp = [uni025B uni025B.alt acutecomb]; @c_alt = [uni025B.alt]; @cno_alt = [uni025B]; @clig_uni025B = [uni025B_acutecomb uni025B_acutecomb.smcp]; @cligno_uni025B = [acutecomb acutecomb.smcp];"><pre class="notranslate"><code>@c_smcp = [uni025B.scmp uni025B.alt.smcp acutecomb.smcp]; @cno_smcp = [uni025B uni025B.alt acutecomb]; @c_alt = [uni025B.alt]; @cno_alt = [uni025B]; @clig_uni025B = [uni025B_acutecomb uni025B_acutecomb.smcp]; @cligno_uni025B = [acutecomb acutecomb.smcp]; </code></pre></div> <p dir="auto">Notice the removal of <code>uni025B_acutecomb.smcp</code> from <code>@c_smcp</code>, since <code>uni025B_acutecomb.smcp</code> is considered by <code>-L firstcomp</code> to be a ligature of <code>uni025B</code> and <code>acutecomb.smcp</code> there is no overall ligature <code>uni025B_acutecomb</code> with a variant <code>.smcp</code> that would fit into <code>@c_smcp</code>. If we use <code>-L lastcomp</code> we change the last two classes to:</p> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="@clig_acutecomb = [uni025B_acutecomb]; @cligno_acutecomb = [uni025B]; @clig_acutecomb_smcp = [uni025B_acutecomb.smcp]; @cligno_acutecomb_smcp = [un025B];"><pre class="notranslate"><code>@clig_acutecomb = [uni025B_acutecomb]; @cligno_acutecomb = [uni025B]; @clig_acutecomb_smcp = [uni025B_acutecomb.smcp]; @cligno_acutecomb_smcp = [un025B]; </code></pre></div> <p dir="auto">With any <code>.</code> in the variant being changed to <code>_</code> in the class name.</p> <p dir="auto">In our example, if the author wanted to use <code>-L lastcomp</code> or <code>-L firstcomp</code>, they might find it more helpful to rename <code>uni025B_acutecomb.smcp</code> to <code>uni025B.smcp_acutecomb</code> and remove the nonsensical <code>acutecomb.smcp</code>. This would give, for <code>-L lastcomp</code>:</p> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="@c_smcp = [uni025B.scmp uni025B.alt.smcp]; @cno_smcp = [uni025B uni025B.alt]; @c_alt = [uni025B.alt]; @cno_alt = [uni025B]; @clig_acutecomb = [uni025B_acutecomb uni025B.smcp_acutecomb]; @cligno_acutecomb = [uni025B uni025B.smcp];"><pre class="notranslate"><code>@c_smcp = [uni025B.scmp uni025B.alt.smcp]; @cno_smcp = [uni025B uni025B.alt]; @c_alt = [uni025B.alt]; @cno_alt = [uni025B]; @clig_acutecomb = [uni025B_acutecomb uni025B.smcp_acutecomb]; @cligno_acutecomb = [uni025B uni025B.smcp]; </code></pre></div> <p dir="auto">and for <code>-L firstcomp</code>, the last two classes become:</p> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="@clig_uni025B = [uni025B_acutecomb]; @cligno_uni025B = [acutecomb]; @clig_uni025B_smcp = [uni025B.smcp_acutecomb]; @cligno_uni025B_smcp = [acutecomb];"><pre class="notranslate"><code>@clig_uni025B = [uni025B_acutecomb]; @cligno_uni025B = [acutecomb]; @clig_uni025B_smcp = [uni025B.smcp_acutecomb]; @cligno_uni025B_smcp = [acutecomb]; </code></pre></div> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Statements</h2><a id="user-content-statements" class="anchor" aria-label="Permalink: Statements" href="#statements"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">baseclass</h3><a id="user-content-baseclass" class="anchor" aria-label="Permalink: baseclass" href="#baseclass"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">A baseclass is the base equivalent of a markclass. It specifies the position of a particular class of anchor points on a base, be that a true base or a mark base. The syntax is the same as for a markclass, but it is used differently in a pos rule:</p> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="markClass [acute] <anchor 350 0> @TOP_MARKS; baseClass [a] <anchor 500 500> @BASE_TOPS; baseClass b <anchor 500 750> @BASE_TOPS; feature test { pos base @BASE_TOPS mark @TOP_MARKS; } test;"><pre class="notranslate"><code>markClass [acute] <anchor 350 0> @TOP_MARKS; baseClass [a] <anchor 500 500> @BASE_TOPS; baseClass b <anchor 500 750> @BASE_TOPS; feature test { pos base @BASE_TOPS mark @TOP_MARKS; } test; </code></pre></div> <p dir="auto">Which is the functional equivalent of:</p> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="markClass [acute] <anchor 350 0> @TOP_MARKS; feature test { pos base [a] <anchor 500 500> mark @TOP_MARKS; pos base b <anchor 500 750> mark @TOP_MARKS; } test;"><pre class="notranslate"><code>markClass [acute] <anchor 350 0> @TOP_MARKS; feature test { pos base [a] <anchor 500 500> mark @TOP_MARKS; pos base b <anchor 500 750> mark @TOP_MARKS; } test; </code></pre></div> <p dir="auto">It should be borne in mind that both markClasses and baseClasses can also be used as normal glyph classes and as such use the same namespace.</p> <p dir="auto">The baseClass statement is a high priority need in order to facilitate auto generation of attachment point information without having to create what might be redundant lookups in the wrong order.</p> <p dir="auto">Given a set of base glyphs with attachment point A and marks with attachment point _A, makefea will generate the following:</p> <ul dir="auto"> <li>baseClass A - containing all bases with attachment point A</li> <li>markClass _A - containing all marks with attachment point _A</li> <li>baseClass A_MarkBase - containing all marks with attachment point A</li> </ul> <div class="markdown-heading" dir="auto"><h4 tabindex="-1" class="heading-element" dir="auto">Cursive Attachment</h4><a id="user-content-cursive-attachment" class="anchor" aria-label="Permalink: Cursive Attachment" href="#cursive-attachment"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Cursive attachment involves two base anchors, one for the entry and one for the exit. We can extend the use of baseClasses to support this, by passing two baseClasses to the pos cursive statement:</p> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="baseClass meem.medial <anchor 700 50> @ENTRIES; baseClass meem.medial <anchor 0 10> @EXITS; feature test { pos cursive @ENTRIES @EXITS; } test;"><pre class="notranslate"><code>baseClass meem.medial <anchor 700 50> @ENTRIES; baseClass meem.medial <anchor 0 10> @EXITS; feature test { pos cursive @ENTRIES @EXITS; } test; </code></pre></div> <p dir="auto">Here we have two base classes for the two anchor points, and the pos cursive processing code works out which glyphs are in both classes, and which are in one or the other and generates the necessary pos cursive statement for each glyph. I.e. there will be statements for the union of the two classes but with null anchors for those only in one (according to which baseClass they are in). This has the added advantage that any code generating baseClasses does not need to know whether a particular attachment point is being used in a cursive attachment. That is entirely up to the user of the baseClass.</p> <div class="markdown-heading" dir="auto"><h4 tabindex="-1" class="heading-element" dir="auto">Mark Attachment</h4><a id="user-content-mark-attachment" class="anchor" aria-label="Permalink: Mark Attachment" href="#mark-attachment"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">The current mark attachment syntax is related to the base mark attachment in that the base mark has to be specified explicitly and we cannot currently use a markclass as the base mark in a mark attachment lookup. We can extend the mark attachment in the same way as we extend the base attachment, by allowing the mark base to be a markclass. Thus:</p> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="pos mark @MARK_BASE_CLASS mark @MARK_MARK_CLASS;"><pre class="notranslate"><code>pos mark @MARK_BASE_CLASS mark @MARK_MARK_CLASS; </code></pre></div> <p dir="auto">Would expand out to a list of mark mark attachment rules.</p> <div class="markdown-heading" dir="auto"><h4 tabindex="-1" class="heading-element" dir="auto">Ligature Attachment</h4><a id="user-content-ligature-attachment" class="anchor" aria-label="Permalink: Ligature Attachment" href="#ligature-attachment"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Ligature attachment involves all the attachments to a ligature in a single rule. Given a list of possible ligature glyphs, the ligature positioning rule has been extended to allow the use of baseClasses instead of the base anchor on the ligature. For a noddy example:</p> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="baseClass a <anchor 200 200> @TOP_1; baseClass fi <anchor 200 0> @BOTTOM_1; baseClass fi <anchor 400 0> @BOTTOM_2; markClass acute <anchor 0 200> @TOP; markClass circumflex <anchor 200 0> @BOTTOM; pos ligature [a fi] @BOTTOM_1 mark @BOTTOM @TOP_1 mark @TOP ligComponent @BOTTOM_2 mark @BOTTOM;"><pre class="notranslate"><code>baseClass a <anchor 200 200> @TOP_1; baseClass fi <anchor 200 0> @BOTTOM_1; baseClass fi <anchor 400 0> @BOTTOM_2; markClass acute <anchor 0 200> @TOP; markClass circumflex <anchor 200 0> @BOTTOM; pos ligature [a fi] @BOTTOM_1 mark @BOTTOM @TOP_1 mark @TOP ligComponent @BOTTOM_2 mark @BOTTOM; </code></pre></div> <p dir="auto">becomes</p> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="pos ligature a <anchor 200 200> mark @TOP ligComponent <anchor NULL>; pos ligature fi <anchor 200 0> mark @BOTTOM ligComponent <anchor 400 0> mark @BOTTOM;"><pre class="notranslate"><code>pos ligature a <anchor 200 200> mark @TOP ligComponent <anchor NULL>; pos ligature fi <anchor 200 0> mark @BOTTOM ligComponent <anchor 400 0> mark @BOTTOM; </code></pre></div> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">ifinfo</h3><a id="user-content-ifinfo" class="anchor" aria-label="Permalink: ifinfo" href="#ifinfo"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">This statement initiates a block either of statements or within another block. The block is only processed if the ifinfo condition is met. ifinfo takes two parameters. The first is a name that is an entry in a fontinfo.plist. The second is a string containing a regular expression that is matched against the given value in the fontinfo.plist. If there is a match, the condition is considered to be met.</p> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="ifinfo(familyName, "Doulos") { # statements }"><pre class="notranslate"><code>ifinfo(familyName, "Doulos") { # statements } </code></pre></div> <p dir="auto">Notice the lack of a <code>;</code> after the block close.</p> <p dir="auto">ifinfo acts as a kind of macro, this means that the test is executed in the parser rather than collecting everything inside the block and processing it later like say the <code>do</code> statement. Notice that if you want to do something more complex than a regular expression test, then you may need to use a <code>do</code> statement and the <code>info()</code> function.</p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">ifclass</h3><a id="user-content-ifclass" class="anchor" aria-label="Permalink: ifclass" href="#ifclass"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">This statement initiates a block either of statements or within another block. The block is only processed if the given @class is defined and contains at least one glyph.</p> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="ifclass(@oddities) { # statements }"><pre class="notranslate"><code>ifclass(@oddities) { # statements } </code></pre></div> <p dir="auto">Notice the lack of a <code>;</code> after the block close.</p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">do</h3><a id="user-content-do" class="anchor" aria-label="Permalink: do" href="#do"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">The <code>do</code> statement is a means of setting variables and repeating statement groups with variable expansion. A <code>do</code> statement is followed by various substatements that are in effect nested statements. The basic structure of the <code>do</code> statement is:</p> <p dir="auto"><code>do</code> <em>substatement</em> <em>substatement</em> <em>...</em> [ <code>{</code> <em>statements</em> <code>}</code> ]</p> <p dir="auto">Where <em>statements</em> is a sequence of FEA statements. Within these statements, variables may be referenced by preceding them with a <code>$</code>. Anything, including statement words, can be the result of variable expantion. The only constraints are:</p> <ul dir="auto"> <li>The item expands to one or more complete tokens. It cannot be joined to something preceding or following it to create a single name, token, whatever.</li> </ul> <p dir="auto">In effect a <code>{}</code> type block following a <code>for</code> or <code>let</code> substatement is the equivalent of inserting the substatement <code>if True;</code> before the block.</p> <div class="markdown-heading" dir="auto"><h4 tabindex="-1" class="heading-element" dir="auto">SubStatements</h4><a id="user-content-substatements" class="anchor" aria-label="Permalink: SubStatements" href="#substatements"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Each substatement is terminated by a <code>;</code>. The various substatements are:</p> <div class="markdown-heading" dir="auto"><h5 tabindex="-1" class="heading-element" dir="auto">for</h5><a id="user-content-for" class="anchor" aria-label="Permalink: for" href="#for"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">The <code>for</code> substatement is structured as:</p> <p dir="auto"><code>for</code> <em>var</em> <code>=</code> <em>glyphlist</em> <code>;</code></p> <p dir="auto">This creates a variable <em>var</em> that will iterate over the <em>glyphlist</em>.</p> <p dir="auto">With the addition of <code>forlet</code> (see below), there is also <code>forgroup</code> that is a synonym for the <code>for</code> substatement defined here.</p> <div class="markdown-heading" dir="auto"><h5 tabindex="-1" class="heading-element" dir="auto">let</h5><a id="user-content-let" class="anchor" aria-label="Permalink: let" href="#let"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">The <code>let</code> substatement executes a short python expression (via <code>eval</code>), storing the result in the given variable, or variable list. The structure of the substatement is:</p> <p dir="auto"><code>let</code> <em>var</em> [<code>,</code> <em>var</em>]* <code>=</code> <em>expression</em> <code>;</code></p> <p dir="auto">There are various python functions that are especially supported, along with the builtins. These are:</p> <markdown-accessiblity-table><table> <thead> <tr> <th>Function</th> <th>Parameters</th> <th>Description</th> </tr> </thead> <tbody> <tr> <td>ADVx</td> <td><em>glyphname</em></td> <td>Returns the advanced width of the given glyph</td> </tr> <tr> <td>allglyphs</td> <td></td> <td>Returns a list of all the glyph names in the font</td> </tr> <tr> <td>APx</td> <td><em>glyphname</em>, "<em>apname</em>"</td> <td>Returns the x coordinate of the given attachment point on the given glyph</td> </tr> <tr> <td>APy</td> <td><em>glyphname</em>, "<em>apname</em>"</td> <td>Returns the y coordinate of the given attachment point on the given glyph</td> </tr> <tr> <td>feaclass</td> <td><em>classname</em></td> <td>Returns a list of the glyph names in a class as a python list</td> </tr> <tr> <td>info</td> <td><em>finfoelement</em></td> <td>Looks up the entry in the fontinfo plist and returns its value</td> </tr> <tr> <td>kerninfo</td> <td></td> <td>Returns a list of tuples (left, right, kern_value)</td> </tr> <tr> <td>opt</td> <td><em>defined</em></td> <td>Looks up a given -D/--define variable. Returns empty string if missing</td> </tr> <tr> <td>MINx</td> <td><em>glyphname</em></td> <td>Returns the minimum x value of the bounding box of the glyph</td> </tr> <tr> <td>MINy</td> <td><em>glyphname</em></td> <td>Returns the minimum y value of the bounding box of the glyph</td> </tr> <tr> <td>MAXx</td> <td><em>glyphname</em></td> <td>Returns the maximum x value of the bounding box of the glyph</td> </tr> <tr> <td>MAXy</td> <td><em>glyphname</em></td> <td>Returns the maximum y value of the bounding box of the glyph</td> </tr> </tbody> </table></markdown-accessiblity-table> <p dir="auto">See the section on python in the <code>def</code> command section following.</p> <div class="markdown-heading" dir="auto"><h5 tabindex="-1" class="heading-element" dir="auto">forlet</h5><a id="user-content-forlet" class="anchor" aria-label="Permalink: forlet" href="#forlet"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">The <code>for</code> substatement only allows iteration over a group of glyphs. There are situations in which someone would want to iterate over a true python expression, for example, over the return value of a function. The <code>forlet</code> substatement is structured identically to a <code>let</code> substatement, but instead of setting the variable once, the following substatements are executed once for each value of the expression, with the variable set to each in turn. For example:</p> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="def optlist(*alist) { if len(alist) > 0: for r in optlist(*alist[1:]): yield [alist[0]] + r yield r else: yield alist } optlist; lookup example { do forlet l = optlist("uni17CC", "@coeng_no_ro", "[uni17C9 uni17CA]", "@below_vowels", "@above_vowels"); let s = " ".join(l) { sub uni17C1 @coeng_ro @base_cons $s uni17B8' lookup insert_dotted_circle; sub uni17C1 @base_cons $s uni17B8' lookup insert_dotted_circle; } } example;"><pre class="notranslate"><code>def optlist(*alist) { if len(alist) > 0: for r in optlist(*alist[1:]): yield [alist[0]] + r yield r else: yield alist } optlist; lookup example { do forlet l = optlist("uni17CC", "@coeng_no_ro", "[uni17C9 uni17CA]", "@below_vowels", "@above_vowels"); let s = " ".join(l) { sub uni17C1 @coeng_ro @base_cons $s uni17B8' lookup insert_dotted_circle; sub uni17C1 @base_cons $s uni17B8' lookup insert_dotted_circle; } } example; </code></pre></div> <p dir="auto">This examples uses a <code>def</code> statement as defined below. The example produces rules for each of the possible subsequences of the optlist parameters, where each element is treated as being optional. It is a way of writing:</p> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="sub uni17C1 @base_cons uni17CC? @coeng_no_ro [uni17C9 uni17CA]? @below_vowels? @above_vowels? uni17B8' lookup insert_dotted_circle;"><pre class="notranslate"><code>sub uni17C1 @base_cons uni17CC? @coeng_no_ro [uni17C9 uni17CA]? @below_vowels? @above_vowels? uni17B8' lookup insert_dotted_circle; </code></pre></div> <p dir="auto">The structure of a <code>forlet</code> substatement is:</p> <p dir="auto"><code>forlet</code> <em>var</em> [<code>,</code> <em>var</em>]* <code>=</code> <em>expression</em> <code>;</code></p> <p dir="auto">A <code>forlet</code> substatement has the same access to functions that the <code>let</code> statement has, included those listed above under <code>let</code>.</p> <div class="markdown-heading" dir="auto"><h5 tabindex="-1" class="heading-element" dir="auto">if</h5><a id="user-content-if" class="anchor" aria-label="Permalink: if" href="#if"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">The <code>if</code> substatement consists of an expression and a block of statements. <code>if</code> substatements only make sense at the end of a sequence of substatements and are executed at the end of the <code>do</code> statement, in the order they occur but after all other <code>for</code> and <code>let</code> substatements. The expression is calculated and if the result is True then the <em>statements</em> are expanded using variable expansion.</p> <p dir="auto"><code>if</code> <em>expression</em> <code>;</code> <code>{</code> <em>statements</em> <code>}</code></p> <p dir="auto">There can be multiple <code>if</code> substatements, each with their own block, in a <code>do</code> statement.</p> <div class="markdown-heading" dir="auto"><h4 tabindex="-1" class="heading-element" dir="auto">Examples</h4><a id="user-content-examples" class="anchor" aria-label="Permalink: Examples" href="#examples"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">The <code>do</code> statement is best understood through some examples.</p> <div class="markdown-heading" dir="auto"><h5 tabindex="-1" class="heading-element" dir="auto">Simple calculation</h5><a id="user-content-simple-calculation" class="anchor" aria-label="Permalink: Simple calculation" href="#simple-calculation"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">This calculates a simple offset shift and creates a lookup to apply it:</p> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="do let a = -int(ADVx("u16F61") / 2); { lookup left_shift_vowel { pos @_H <$a 0 0 0>; } left_shift_vowel; }"><pre class="notranslate"><code>do let a = -int(ADVx("u16F61") / 2); { lookup left_shift_vowel { pos @_H <$a 0 0 0>; } left_shift_vowel; } </code></pre></div> <p dir="auto">Notice the lack of iteration here.</p> <div class="markdown-heading" dir="auto"><h5 tabindex="-1" class="heading-element" dir="auto">More complex calculation</h5><a id="user-content-more-complex-calculation" class="anchor" aria-label="Permalink: More complex calculation" href="#more-complex-calculation"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">This calculates the guard spaces on either side of a base glyph in response to applied diacritics.</p> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="lookup advance_base { do for g = @H; let a = APx(g, "H") - ADVx(g) + int(1.5 * ADVx("u16F61")); let b = int(1.5 * ADVx("u16F61")) - APx(g, "H"); let c = a + b; { pos $g <$b 0 $c 0>; } } advance_base;"><pre class="notranslate"><code>lookup advance_base { do for g = @H; let a = APx(g, "H") - ADVx(g) + int(1.5 * ADVx("u16F61")); let b = int(1.5 * ADVx("u16F61")) - APx(g, "H"); let c = a + b; { pos $g <$b 0 $c 0>; } } advance_base; </code></pre></div> <div class="markdown-heading" dir="auto"><h5 tabindex="-1" class="heading-element" dir="auto">Right Guard</h5><a id="user-content-right-guard" class="anchor" aria-label="Permalink: Right Guard" href="#right-guard"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">It is often desirable to give a base character extra advance width to account for a diacritic hanging over the right hand side of the glyph. Calculating this can be very difficult by hand. This code achieves this:</p> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="do for b = @bases; for d = @diacritics; let v = (ADVx(d) - APx(d, "_U")) - (ADVx(b) - APx(b, "U")); if v > 0; { pos $b' $v $d; }"><pre class="notranslate"><code>do for b = @bases; for d = @diacritics; let v = (ADVx(d) - APx(d, "_U")) - (ADVx(b) - APx(b, "U")); if v > 0; { pos $b' $v $d; } </code></pre></div> <div class="markdown-heading" dir="auto"><h5 tabindex="-1" class="heading-element" dir="auto">Left Guard</h5><a id="user-content-left-guard" class="anchor" aria-label="Permalink: Left Guard" href="#left-guard"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">A corresponding guarding of space for diacritics may be done on the left side of a glyph:</p> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="do for b = @bases; for d = @diacritics; let v = APx(d, "_U") - APx(b, "U"); if v > 0; { pos $b' <$v 0 $v 0> $d; }"><pre class="notranslate"><code>do for b = @bases; for d = @diacritics; let v = APx(d, "_U") - APx(b, "U"); if v > 0; { pos $b' <$v 0 $v 0> $d; } </code></pre></div> <div class="markdown-heading" dir="auto"><h5 tabindex="-1" class="heading-element" dir="auto">Left Kern</h5><a id="user-content-left-kern" class="anchor" aria-label="Permalink: Left Kern" href="#left-kern"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Consider the case where someone has used an attachment point as a kerning point. In some context they want to adjust the advance of the left glyph based on the position of the attachment point in the right glyph:</p> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="do for r = @rights; let v = APx(r, "K"); { pos @lefts' $v $r; pos @lefts' $v @diacritics $r; }"><pre class="notranslate"><code>do for r = @rights; let v = APx(r, "K"); { pos @lefts' $v $r; pos @lefts' $v @diacritics $r; } </code></pre></div> <div class="markdown-heading" dir="auto"><h4 tabindex="-1" class="heading-element" dir="auto">Indexed substitution using a different slot in the stream</h4><a id="user-content-indexed-substitution-using-a-different-slot-in-the-stream" class="anchor" aria-label="Permalink: Indexed substitution using a different slot in the stream" href="#indexed-substitution-using-a-different-slot-in-the-stream"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Sometimes it is necessary to perform a substution in one slot in the stream based on a different slot. In this case case we want to replace members of class @A with corresponding members of @A1 @A2, where @A2 is indexed identically to @A1.</p> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="lookup splitA { do forlet i,a = enumerate(feaclass('A')); let a1 = feaclass('A1')[i]; let a2 = feaclass('A2')[i]; { sub @A by $a1 $a2; } } splitA; "><pre class="notranslate"><code>lookup splitA { do forlet i,a = enumerate(feaclass('A')); let a1 = feaclass('A1')[i]; let a2 = feaclass('A2')[i]; { sub @A by $a1 $a2; } } splitA; </code></pre></div> <div class="markdown-heading" dir="auto"><h5 tabindex="-1" class="heading-element" dir="auto">Myanmar Great Ya</h5><a id="user-content-myanmar-great-ya" class="anchor" aria-label="Permalink: Myanmar Great Ya" href="#myanmar-great-ya"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">One obscure situation is the Great Ya (U+103C) in the Myanmar script, that visual wraps around the following base glyph. The great ya is given a small advance to then position the following consonant glyph within it. The advance of this consonant needs to be enough to place the next character outside the great ya. So we create an A attachment point on the great ya to emulate this intended final advance. Note that there are many variants of the great ya glyph. Thus:</p> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="do for y = @c103C_nar; for c = @cCons_nar; let v = APx(y, "A") - (ADVx(y) + ADVx(c)); if v > 0; { pos $y' $v $c; } do for y = @c103C_wide; for c = @cCons_wide; let v = APx(y, "A") - (ADVx(y) + ADVx(c)); if v > 0; { pos $y' $v $c; }"><pre class="notranslate"><code>do for y = @c103C_nar; for c = @cCons_nar; let v = APx(y, "A") - (ADVx(y) + ADVx(c)); if v > 0; { pos $y' $v $c; } do for y = @c103C_wide; for c = @cCons_wide; let v = APx(y, "A") - (ADVx(y) + ADVx(c)); if v > 0; { pos $y' $v $c; } </code></pre></div> <div class="markdown-heading" dir="auto"><h5 tabindex="-1" class="heading-element" dir="auto">Advance for Ldot on U</h5><a id="user-content-advance-for-ldot-on-u" class="anchor" aria-label="Permalink: Advance for Ldot on U" href="#advance-for-ldot-on-u"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">This example mirrors that used in the proposed <a href="/silnrsi/feax/blob/main/docs/feax_future.md#setadvance"><code>setadvance</code></a> statement. Here we want to add sufficient advance on the base to correspond to attaching an u vowel which in turn has a lower dot attached to it.</p> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="do for b = @cBases; for u = @cLVowels; let v = APx(b, "L") - APx(u, "_L") + APx(u, "LD") - APx("ldot", "_LD") + ADVx("ldot") - ADVx(b); if v > 0; { pos $b' $v $u ldot; }"><pre class="notranslate"><code>do for b = @cBases; for u = @cLVowels; let v = APx(b, "L") - APx(u, "_L") + APx(u, "LD") - APx("ldot", "_LD") + ADVx("ldot") - ADVx(b); if v > 0; { pos $b' $v $u ldot; } </code></pre></div> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">def</h3><a id="user-content-def" class="anchor" aria-label="Permalink: def" href="#def"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">The <code>def</code> statement allows for the creation of python functions for use in <code>let</code> substatements of the <code>do</code> statement. The syntax of the <code>def</code> statement is:</p> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="def <fn>(<param_list>) { ... python code ... } <fn>;"><pre class="notranslate"><code>def <fn>(<param_list>) { ... python code ... } <fn>; </code></pre></div> <p dir="auto">The <code>fn</code> must conform to a FEA name (not starting with a digit, etc.) and is repeated at the end of the block to mark the end of the function. The parameter is a standard python parameter list and the python code is standard python code, indented as if under a <code>def</code> statement.</p> <div class="markdown-heading" dir="auto"><h4 tabindex="-1" class="heading-element" dir="auto">python support</h4><a id="user-content-python-support" class="anchor" aria-label="Permalink: python support" href="#python-support"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Here and in <code>let</code> and <code>forlet</code> substatements, the python that is allowed to be executed is limited. Only a subset of functions from builtins is supported and the <code>__</code> may not occur in any attribute. This is to stop people escaping the sandbox in which python code is interpreted. The <code>math</code> and <code>re</code> modules are also included along with the functions available to a <code>let</code> and <code>forlet</code> substatement. The full list of builtins supported are:</p> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="True, False, None, int, float, str, abs, bool, dict, enumerate, filter, hex, isinstance, len, list, map, max, min, ord, range, set, sorted, sum, tuple, type, zip"><pre class="notranslate"><code>True, False, None, int, float, str, abs, bool, dict, enumerate, filter, hex, isinstance, len, list, map, max, min, ord, range, set, sorted, sum, tuple, type, zip </code></pre></div> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">kernpairs</h3><a id="user-content-kernpairs" class="anchor" aria-label="Permalink: kernpairs" href="#kernpairs"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">The <code>kernpairs</code> statement expands all the kerning pairs in the font into <code>pos</code> statements. For example:</p> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="lookup kernpairs { lookupflag IgnoreMarks; kernpairs; } kernpairs;"><pre class="notranslate"><code>lookup kernpairs { lookupflag IgnoreMarks; kernpairs; } kernpairs; </code></pre></div> <p dir="auto">Might produce:</p> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="lookup kernpairs { lookupflag IgnoreMarks; pos @MMK_L_afii57929 -164 @MMK_R_uniA4F8; pos @MMK_L_uniA4D1 -164 @MMK_R_uniA4F8; pos @MMK_L_uniA4D5 -164 @MMK_R_afii57929; pos @MMK_L_uniA4FA -148 @MMK_R_space; } kernpairs;"><pre class="notranslate"><code>lookup kernpairs { lookupflag IgnoreMarks; pos @MMK_L_afii57929 -164 @MMK_R_uniA4F8; pos @MMK_L_uniA4D1 -164 @MMK_R_uniA4F8; pos @MMK_L_uniA4D5 -164 @MMK_R_afii57929; pos @MMK_L_uniA4FA -148 @MMK_R_space; } kernpairs; </code></pre></div> <p dir="auto">Currently, kerning information is only available from .ufo files.</p> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">Capabilities</h2><a id="user-content-capabilities" class="anchor" aria-label="Permalink: Capabilities" href="#capabilities"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Permit classes on both sides of GSUB type 2 (multiple) and type 4 (ligature) lookups</h3><a id="user-content-permit-classes-on-both-sides-of-gsub-type-2-multiple-and-type-4-ligature-lookups" class="anchor" aria-label="Permalink: Permit classes on both sides of GSUB type 2 (multiple) and type 4 (ligature) lookups" href="#permit-classes-on-both-sides-of-gsub-type-2-multiple-and-type-4-ligature-lookups"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Adobe doesn't permit compact notation using groups in 1-to-many (decomposition) rules e.g:</p> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content=" sub @AlefPlusMark by absAlef @AlefMark ;"><pre class="notranslate"><code> sub @AlefPlusMark by absAlef @AlefMark ; </code></pre></div> <p dir="auto">or many-to-1 (ligature) rules, e.g.:</p> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content=" sub @ShaddaKasraMarks absShadda by @ShaddaKasraLigatures ;"><pre class="notranslate"><code> sub @ShaddaKasraMarks absShadda by @ShaddaKasraLigatures ; </code></pre></div> <p dir="auto">This is implemented in FEAX as follows.</p> <div class="markdown-heading" dir="auto"><h4 tabindex="-1" class="heading-element" dir="auto">Processing</h4><a id="user-content-processing" class="anchor" aria-label="Permalink: Processing" href="#processing"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Of the four simple (i.e., non-contextual) substitution lookups, Types 2 and 4 are the only ones using the 'by' keyword that have a <em>sequence</em> of glyphs or classes on one side of the rule. The other side will, necessarily, contain a single term -- which Adobe currently requires to be a glyph. For convenience of expression, we'll call the sides of the rule the <em>sequence side</em> and the <em>singleton side</em>.</p> <ul dir="auto"> <li>Non-contextual substitution</li> <li>Uses the 'by' keyword</li> <li>Singleton side references a glyph class.</li> </ul> <p dir="auto">Such rules are expanded by enumerating the singleton side class and the corresponding class(es) on the sequence side and writing a set of Adobe-compliant rules to give the same result. It is an error if the singleton and corresponding classes do not have the same number of glyphs.</p> <div class="markdown-heading" dir="auto"><h4 tabindex="-1" class="heading-element" dir="auto">Example</h4><a id="user-content-example" class="anchor" aria-label="Permalink: Example" href="#example"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Given:</p> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content=" @class1 = [ g1 g2 ] ; @class2 = [ g1a g2a ] ;"><pre class="notranslate"><code> @class1 = [ g1 g2 ] ; @class2 = [ g1a g2a ] ; </code></pre></div> <p dir="auto">then</p> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content=" sub @class1 gOther by @class2 ;"><pre class="notranslate"><code> sub @class1 gOther by @class2 ; </code></pre></div> <p dir="auto">would be rewritten as:</p> <div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content=" sub g1 gOther by g1a ; sub g2 gOther by g2a ;"><pre class="notranslate"><code> sub g1 gOther by g1a ; sub g2 gOther by g2a ; </code></pre></div> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">Support classes in alternate lookups</h3><a id="user-content-support-classes-in-alternate-lookups" class="anchor" aria-label="Permalink: Support classes in alternate lookups" href="#support-classes-in-alternate-lookups"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">The default behaviour in FEA is for a <code>sub x from [x.a x.b];</code> to only allow a single glyph before the <code>from</code> keyword. But it is often useful to do things like: <code>sub @a from [@a.lower @a.upper];</code>. Feax supports this by treating the right hand side list of glyphs as a single list and dividing it equally by the list on the left. Thus if <code>@a</code> is of length 3 then the first 3 glyphs in the right hand list will go one each as the first alternate for each glyph in <code>@a</code>, then the next 3 go as the second alternate, and so on until they are all consumed. If any are left over in that one of the glyphs ends up with a different number of alternates to another, then an error is given.</p> <div class="markdown-heading" dir="auto"><h3 tabindex="-1" class="heading-element" dir="auto">groups.plist</h3><a id="user-content-groupsplist" class="anchor" aria-label="Permalink: groups.plist" href="#groupsplist"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">If a .ufo file contains a <code>groups.plist</code> file, the groups declared there are propagated straight through to the output file and can be referenced within a source file.</p> </article></div><button hidden=""></button></section></div></div></div>   </div></div></div><div class="Box-sc-g0xbh4-0"></div></div></div></div></div><div id="find-result-marks-container" class="Box-sc-g0xbh4-0 cCoXib"></div><button hidden="" data-testid="" data-hotkey-scope="read-only-cursor-text-area"></button><button hidden=""></button></div>   <script type="application/json" id="__PRIMER_DATA_:R0:__">{"resolvedServerColorMode":"day"}</script></div> </react-app> </turbo-frame> </div> </turbo-frame> </main> </div> </div> <footer class="footer pt-8 pb-6 f6 color-fg-muted p-responsive" role="contentinfo" > <h2 class='sr-only'>Footer</h2> <div class="d-flex flex-justify-center flex-items-center flex-column-reverse flex-lg-row flex-wrap flex-lg-nowrap"> <div 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1 5 9.25Zm1.75-.25a.25.25 0 0 0-.25.25v7.5c0 .138.112.25.25.25h7.5a.25.25 0 0 0 .25-.25v-7.5a.25.25 0 0 0-.25-.25Z"></path> </svg> <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-check js-clipboard-check-icon color-fg-success d-none m-2"> <path d="M13.78 4.22a.75.75 0 0 1 0 1.06l-7.25 7.25a.75.75 0 0 1-1.06 0L2.22 9.28a.751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018L6 10.94l6.72-6.72a.75.75 0 0 1 1.06 0Z"></path> </svg> </clipboard-copy> </div> </template> <template id="snippet-clipboard-copy-button-unpositioned"> <div class="zeroclipboard-container"> <clipboard-copy aria-label="Copy" class="ClipboardButton btn btn-invisible js-clipboard-copy m-2 p-0 d-flex flex-justify-center flex-items-center" data-copy-feedback="Copied!" data-tooltip-direction="w"> <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-copy js-clipboard-copy-icon"> <path d="M0 6.75C0 5.784.784 5 1.75 5h1.5a.75.75 0 0 1 0 1.5h-1.5a.25.25 0 0 0-.25.25v7.5c0 .138.112.25.25.25h7.5a.25.25 0 0 0 .25-.25v-1.5a.75.75 0 0 1 1.5 0v1.5A1.75 1.75 0 0 1 9.25 16h-7.5A1.75 1.75 0 0 1 0 14.25Z"></path><path d="M5 1.75C5 .784 5.784 0 6.75 0h7.5C15.216 0 16 .784 16 1.75v7.5A1.75 1.75 0 0 1 14.25 11h-7.5A1.75 1.75 0 0 1 5 9.25Zm1.75-.25a.25.25 0 0 0-.25.25v7.5c0 .138.112.25.25.25h7.5a.25.25 0 0 0 .25-.25v-7.5a.25.25 0 0 0-.25-.25Z"></path> </svg> <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-check js-clipboard-check-icon color-fg-success d-none"> <path d="M13.78 4.22a.75.75 0 0 1 0 1.06l-7.25 7.25a.75.75 0 0 1-1.06 0L2.22 9.28a.751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018L6 10.94l6.72-6.72a.75.75 0 0 1 1.06 0Z"></path> </svg> </clipboard-copy> </div> </template> </div> <div id="js-global-screen-reader-notice" class="sr-only mt-n1" aria-live="polite" aria-atomic="true" ></div> <div id="js-global-screen-reader-notice-assertive" class="sr-only mt-n1" aria-live="assertive" aria-atomic="true"></div> </body> </html>