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class="vector-main-menu-container"> <div id="mw-navigation"> <nav id="mw-panel" class="vector-main-menu-landmark" aria-label="Site"> <div id="vector-main-menu-pinned-container" class="vector-pinned-container"> </div> </nav> </div> </div> </div> <div class="mw-content-container"> <main id="content" class="mw-body"> <header class="mw-body-header vector-page-titlebar"> <h1 id="firstHeading" class="firstHeading mw-first-heading">Module:parser: difference between revisions</h1> <div id="p-lang-btn" class="vector-dropdown mw-portlet mw-portlet-lang" > <input type="checkbox" id="p-lang-btn-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-p-lang-btn" class="vector-dropdown-checkbox mw-interlanguage-selector" aria-label="Go to an article in another language. Available in 18 languages" > <label id="p-lang-btn-label" for="p-lang-btn-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--action-progressive mw-portlet-lang-heading-18" aria-hidden="true" > 18 languages </label> <div class="vector-dropdown-content"> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li class="interlanguage-link interwiki-ar mw-list-item"><a href="https://ar.wiktionary.org/wiki/%D9%88%D8%AD%D8%AF%D8%A9:parser" title="وحدة:parser – Arabic" lang="ar" hreflang="ar" data-title="وحدة:parser" data-language-autonym="العربية" data-language-local-name="Arabic" class="interlanguage-link-target">العربية</a></li><li class="interlanguage-link interwiki-bn mw-list-item"><a href="https://bn.wiktionary.org/wiki/%E0%A6%AE%E0%A6%A1%E0%A6%BF%E0%A6%89%E0%A6%B2:parser" title="মডিউল:parser – Bangla" lang="bn" hreflang="bn" data-title="মডিউল:parser" data-language-autonym="বাংলা" data-language-local-name="Bangla" class="interlanguage-link-target">বাংলা</a></li><li class="interlanguage-link interwiki-bjn mw-list-item"><a href="https://bjn.wiktionary.org/wiki/Modul:parser" title="Modul:parser – Banjar" lang="bjn" hreflang="bjn" data-title="Modul:parser" data-language-autonym="Banjar" data-language-local-name="Banjar" class="interlanguage-link-target">Banjar</a></li><li class="interlanguage-link interwiki-hsb mw-list-item"><a href="https://hsb.wiktionary.org/wiki/Modul:parser" title="Modul:parser – Upper Sorbian" lang="hsb" hreflang="hsb" data-title="Modul:parser" data-language-autonym="Hornjoserbsce" data-language-local-name="Upper Sorbian" class="interlanguage-link-target">Hornjoserbsce</a></li><li class="interlanguage-link interwiki-ky mw-list-item"><a href="https://ky.wiktionary.org/wiki/%D0%9C%D0%BE%D0%B4%D1%83%D0%BB%D1%8C:parser" title="Модуль:parser – Kyrgyz" lang="ky" hreflang="ky" data-title="Модуль:parser" data-language-autonym="Кыргызча" data-language-local-name="Kyrgyz" class="interlanguage-link-target">Кыргызча</a></li><li class="interlanguage-link interwiki-mt mw-list-item"><a href="https://mt.wiktionary.org/wiki/Module:parser" title="Module:parser – Maltese" lang="mt" hreflang="mt" data-title="Module:parser" data-language-autonym="Malti" data-language-local-name="Maltese" class="interlanguage-link-target">Malti</a></li><li class="interlanguage-link interwiki-mnw mw-list-item"><a href="https://mnw.wiktionary.org/wiki/%E1%80%99%E1%80%9D%E1%80%BA%E1%80%82%E1%80%BB%E1%80%B0:parser" title="မဝ်ဂျူ:parser – Mon" lang="mnw" hreflang="mnw" data-title="မဝ်ဂျူ:parser" data-language-autonym="ဘာသာမန်" data-language-local-name="Mon" class="interlanguage-link-target">ဘာသာမန်</a></li><li class="interlanguage-link interwiki-ms mw-list-item"><a href="https://ms.wiktionary.org/wiki/Modul:parser" title="Modul:parser – Malay" lang="ms" hreflang="ms" data-title="Modul:parser" data-language-autonym="Bahasa Melayu" data-language-local-name="Malay" class="interlanguage-link-target">Bahasa Melayu</a></li><li class="interlanguage-link interwiki-my mw-list-item"><a href="https://my.wiktionary.org/wiki/%E1%80%99%E1%80%B1%E1%80%AC%E1%80%BA%E1%80%82%E1%80%BB%E1%80%B0%E1%80%B8:parser" title="မော်ဂျူး:parser – Burmese" lang="my" hreflang="my" data-title="မော်ဂျူး:parser" data-language-autonym="မြန်မာဘာသာ" data-language-local-name="Burmese" class="interlanguage-link-target">မြန်မာဘာသာ</a></li><li class="interlanguage-link interwiki-ja mw-list-item"><a href="https://ja.wiktionary.org/wiki/%E3%83%A2%E3%82%B8%E3%83%A5%E3%83%BC%E3%83%AB:parser" title="モジュール:parser – Japanese" lang="ja" hreflang="ja" data-title="モジュール:parser" data-language-autonym="日本語" data-language-local-name="Japanese" class="interlanguage-link-target">日本語</a></li><li class="interlanguage-link interwiki-pa mw-list-item"><a href="https://pa.wiktionary.org/wiki/%E0%A8%AE%E0%A9%8C%E0%A8%A1%E0%A8%BF%E0%A8%8A%E0%A8%B2:parser" title="ਮੌਡਿਊਲ:parser – Punjabi" lang="pa" hreflang="pa" data-title="ਮੌਡਿਊਲ:parser" data-language-autonym="ਪੰਜਾਬੀ" data-language-local-name="Punjabi" class="interlanguage-link-target">ਪੰਜਾਬੀ</a></li><li class="interlanguage-link interwiki-si mw-list-item"><a href="https://si.wiktionary.org/wiki/Module:parser" title="Module:parser – Sinhala" lang="si" hreflang="si" data-title="Module:parser" data-language-autonym="සිංහල" data-language-local-name="Sinhala" class="interlanguage-link-target">සිංහල</a></li><li class="interlanguage-link interwiki-ckb mw-list-item"><a href="https://ckb.wiktionary.org/wiki/%D9%85%DB%86%D8%AF%DB%8C%D9%88%D9%88%D9%84:parser" title="مۆدیوول:parser – Central Kurdish" lang="ckb" hreflang="ckb" data-title="مۆدیوول:parser" data-language-autonym="کوردی" data-language-local-name="Central Kurdish" class="interlanguage-link-target">کوردی</a></li><li class="interlanguage-link interwiki-sr mw-list-item"><a href="https://sr.wiktionary.org/wiki/%D0%9C%D0%BE%D0%B4%D1%83%D0%BB:parser" title="Модул:parser – Serbian" lang="sr" hreflang="sr" data-title="Модул:parser" data-language-autonym="Српски / srpski" data-language-local-name="Serbian" class="interlanguage-link-target">Српски / srpski</a></li><li class="interlanguage-link interwiki-shn mw-list-item"><a href="https://shn.wiktionary.org/wiki/%E1%80%99%E1%80%B1%E1%82%83%E1%82%87%E1%81%B5%E1%80%BB%E1%80%B0%E1%80%B8:parser" title="မေႃႇၵျူး:parser – Shan" lang="shn" hreflang="shn" data-title="မေႃႇၵျူး:parser" data-language-autonym="ၽႃႇသႃႇတႆး " data-language-local-name="Shan" class="interlanguage-link-target">ၽႃႇသႃႇတႆး </a></li><li class="interlanguage-link interwiki-th mw-list-item"><a href="https://th.wiktionary.org/wiki/%E0%B8%A1%E0%B8%AD%E0%B8%94%E0%B8%B9%E0%B8%A5:parser" title="มอดูล:parser – Thai" lang="th" hreflang="th" data-title="มอดูล:parser" data-language-autonym="ไทย" 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data-mw="interface"> <col class="diff-marker" /> <col class="diff-content" /> <col class="diff-marker" /> <col class="diff-content" /> <tr class="diff-title" lang="en"> <td colspan="2" class="diff-otitle diff-side-deleted"><div id="mw-diff-otitle1"><a href="/w/index.php?title=Module:parser&oldid=82790606" title="Module:parser">Revision as of 06:00, 29 November 2024</a> <a href="/w/index.php?title=Module:parser&action=edit&oldid=82790606" title="Module:parser">view source</a></div><div id="mw-diff-otitle2"><a href="/wiki/User:Theknightwho" class="mw-userlink" title="User:Theknightwho" data-mw-revid="82790606"><bdi>Theknightwho</bdi></a> (<a href="/wiki/User_talk:Theknightwho" class="mw-usertoollinks-talk" title="User talk:Theknightwho">talk</a> | <a href="/wiki/Special:Contributions/Theknightwho" class="mw-usertoollinks-contribs" title="Special:Contributions/Theknightwho">contribs</a>)<div class="mw-diff-usermetadata"><div class="mw-diff-userroles"><a href="/wiki/Wiktionary:Autopatrollers" title="Wiktionary:Autopatrollers">Autopatrollers</a>, <a href="/wiki/Wiktionary:Administrators" title="Wiktionary:Administrators">Administrators</a>, <a href="/wiki/Wiktionary:Template_editors" title="Wiktionary:Template editors">Template editors</a></div><div class="mw-diff-usereditcount">171,892 edits</div></div></div><div id="mw-diff-otitle3">No edit summary</div><div id="mw-diff-otitle5"></div><div id="mw-diff-otitle4"><a href="/w/index.php?title=Module:parser&diff=prev&oldid=82790606" title="Module:parser" id="differences-prevlink">← Go to previous edit</a></div></td> <td colspan="2" class="diff-ntitle diff-side-added"><div id="mw-diff-ntitle1"><a href="/w/index.php?title=Module:parser&oldid=82792584" title="Module:parser">Revision as of 11:24, 29 November 2024</a> <a href="/w/index.php?title=Module:parser&action=edit&oldid=82792584" title="Module:parser">view source</a> </div><div id="mw-diff-ntitle2"><a href="/wiki/User:Theknightwho" class="mw-userlink" title="User:Theknightwho" data-mw-revid="82792584"><bdi>Theknightwho</bdi></a> (<a href="/wiki/User_talk:Theknightwho" class="mw-usertoollinks-talk" title="User talk:Theknightwho">talk</a> | <a href="/wiki/Special:Contributions/Theknightwho" class="mw-usertoollinks-contribs" title="Special:Contributions/Theknightwho">contribs</a>)<div class="mw-diff-usermetadata"><div class="mw-diff-userroles"><a href="/wiki/Wiktionary:Autopatrollers" title="Wiktionary:Autopatrollers">Autopatrollers</a>, <a href="/wiki/Wiktionary:Administrators" title="Wiktionary:Administrators">Administrators</a>, <a href="/wiki/Wiktionary:Template_editors" title="Wiktionary:Template editors">Template editors</a></div><div class="mw-diff-usereditcount">171,892 edits</div></div></div><div id="mw-diff-ntitle3">No edit summary</div><div id="mw-diff-ntitle5"></div><div id="mw-diff-ntitle4"><a href="/w/index.php?title=Module:parser&diff=next&oldid=82792584" title="Module:parser" id="differences-nextlink">Go to next edit →</a></div></td> </tr><tr> <td colspan="2" class="diff-lineno">Line 135:</td> <td colspan="2" class="diff-lineno">Line 135:</td> </tr> <tr> <td class="diff-marker"></td> <td class="diff-context diff-side-deleted"><div>function Node:iterate(test)</div></td> <td class="diff-marker"></td> <td class="diff-context diff-side-added"><div>function Node:iterate(test)</div></td> </tr> <tr> <td class="diff-marker"></td> <td class="diff-context diff-side-deleted"><div> local node, k, n, nodes, keys, returned_self = self, 0, 0</div></td> <td class="diff-marker"></td> <td class="diff-context diff-side-added"><div> local node, k, n, nodes, keys, returned_self = self, 0, 0</div></td> </tr> <tr> <td colspan="2" class="diff-empty diff-side-deleted"></td> <td class="diff-marker" data-marker="+"></td> <td class="diff-addedline diff-side-added"><div> -- Special case if `test` is `is_node`.</div></td> </tr> <tr> <td colspan="2" class="diff-empty diff-side-deleted"></td> <td class="diff-marker" data-marker="+"></td> <td class="diff-addedline diff-side-added"><div> local is_node_is_test = test == is_node</div></td> </tr> <tr> <td class="diff-marker"></td> <td class="diff-context diff-side-deleted"><div> </div></td> <td class="diff-marker"></td> <td class="diff-context diff-side-added"><div> </div></td> </tr> <tr> <td class="diff-marker"></td> <td class="diff-context diff-side-deleted"><div> return function()</div></td> <td class="diff-marker"></td> <td class="diff-context diff-side-added"><div> return function()</div></td> </tr> <tr> <td colspan="2" class="diff-lineno">Line 167:</td> <td colspan="2" class="diff-lineno">Line 169:</td> </tr> <tr> <td class="diff-marker"></td> <td class="diff-context diff-side-deleted"><div> return v, node, k</div></td> <td class="diff-marker"></td> <td class="diff-context diff-side-added"><div> return v, node, k</div></td> </tr> <tr> <td class="diff-marker"></td> <td class="diff-context diff-side-deleted"><div> -- If `test` is `is_node`, there's no point checking it again on the next loop.</div></td> <td class="diff-marker"></td> <td class="diff-context diff-side-added"><div> -- If `test` is `is_node`, there's no point checking it again on the next loop.</div></td> </tr> <tr> <td class="diff-marker" data-marker="−"></td> <td class="diff-deletedline diff-side-deleted"><div> elseif node_check and <del class="diffchange diffchange-inline">test == is_node</del> then</div></td> <td class="diff-marker" data-marker="+"></td> <td class="diff-addedline diff-side-added"><div> elseif node_check and <ins class="diffchange diffchange-inline">is_node_is_test</ins> then</div></td> </tr> <tr> <td class="diff-marker"></td> <td class="diff-context diff-side-deleted"><div> node_check = false</div></td> <td class="diff-marker"></td> <td class="diff-context diff-side-added"><div> node_check = false</div></td> </tr> <tr> <td class="diff-marker"></td> <td class="diff-context diff-side-deleted"><div> end</div></td> <td class="diff-marker"></td> <td class="diff-context diff-side-added"><div> end</div></td> </tr>  </table><hr class='diff-hr' id='mw-oldid' /> <h2 class='diff-currentversion-title'>Revision as of 11:24, 29 November 2024</h2> <div class="mw-content-ltr mw-parser-output" lang="en" dir="ltr"><div class="documentation" style="display:block; clear:both"> <hr /> <dl class="plainlinks" style="font-size: smaller;"><dd>The following <a href="/wiki/Help:Documenting_templates_and_modules" title="Help:Documenting templates and modules">documentation</a> is located at <a href="/wiki/Module:parser/documentation" title="Module:parser/documentation">Module:parser/documentation</a>. [<a class="external text" href="https://en.wiktionary.org/w/index.php?title=Module:parser/documentation&action=edit">edit</a>]</dd><dd> Useful links: <a href="/wiki/Special:PrefixIndex/Module:parser/" title="Special:PrefixIndex/Module:parser/">subpage list</a> • <a class="external text" href="https://en.wiktionary.org/w/index.php?title=Special%3AWhatLinksHere%2FModule%3Aparser&hideredirs=1&hidetrans=1">links</a> • <a class="external text" href="https://en.wiktionary.org/w/index.php?title=Special%3AWhatLinksHere%2FModule%3Aparser&hidelinks=1&hideredirs=1">transclusions</a> • <a href="/w/index.php?title=Module:parser/testcases&action=edit&redlink=1" class="new" title="Module:parser/testcases (page does not exist)">testcases</a> • <a href="/w/index.php?title=Module:parser/sandbox&action=edit&redlink=1" class="new" title="Module:parser/sandbox (page does not exist)">sandbox</a></dd></dl> <style data-mw-deduplicate="TemplateStyles:r82267123">.mw-parser-output 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.maintenance-box-orange{background-color:#44301D;border-color:#7F7973}}</style><div class="noprint maintenance-box maintenance-box-blue"> <table> <tbody><tr> <td rowspan="2"><a href="/wiki/File:Text-x-generic_with_pencil.svg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/2/20/Text-x-generic_with_pencil.svg/40px-Text-x-generic_with_pencil.svg.png" decoding="async" width="40" height="40" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/2/20/Text-x-generic_with_pencil.svg/60px-Text-x-generic_with_pencil.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/2/20/Text-x-generic_with_pencil.svg/80px-Text-x-generic_with_pencil.svg.png 2x" data-file-width="48" data-file-height="48" /></a> </td> <th style="text-align: left;">This module needs documentation. </th></tr> <tr> <td>Please <a href="/wiki/Help:Documenting_templates_and_modules" title="Help:Documenting templates and modules">document</a> this module by describing its purpose and usage on the <a href="/wiki/Module:parser/documentation" title="Module:parser/documentation">documentation page</a>. </td></tr></tbody></table></div> </div> <div class="mw-highlight mw-highlight-lang-lua mw-content-ltr mw-highlight-lines" dir="ltr"><pre><a href="#L-1"></a>local export = {} <a href="#L-2"></a> <a href="#L-3"></a>local metamethods_data_module = "Module:data/metamethods" <a href="#L-4"></a>local table_module = "Module:table" <a href="#L-5"></a> <a href="#L-6"></a>local concat = table.concat <a href="#L-7"></a>local getmetatable = getmetatable <a href="#L-8"></a>local insert = table.insert <a href="#L-9"></a>local next = next <a href="#L-10"></a>local rawget = rawget <a href="#L-11"></a>local rawset = rawset <a href="#L-12"></a>local remove = table.remove <a href="#L-13"></a>local setmetatable = setmetatable <a href="#L-14"></a>local type = type <a href="#L-15"></a>local unpack = unpack <a href="#L-16"></a> <a href="#L-17"></a>local classes = {} <a href="#L-18"></a> <a href="#L-19"></a>--[==[ <a href="#L-20"></a>Loaders for functions in other modules, which overwrite themselves with the target function when called. This ensures modules are only loaded when needed, retains the speed/convenience of locally-declared pre-loaded functions, and has no overhead after the first call, since the target functions are called directly in any subsequent calls.]==] <a href="#L-21"></a> local function deepcopy(...) <a href="#L-22"></a> deepcopy = require(table_module).deepcopy <a href="#L-23"></a> return deepcopy(...) <a href="#L-24"></a> end <a href="#L-25"></a> <a href="#L-26"></a>--[==[ <a href="#L-27"></a>Loaders for objects, which load data (or some other object) into some variable, which can then be accessed as "foo or get_foo()", where the function get_foo sets the object to "foo" and then returns it. This ensures they are only loaded when needed, and avoids the need to check for the existence of the object each time, since once "foo" has been set, "get_foo" will not be called again.]==] <a href="#L-28"></a> local metamethods <a href="#L-29"></a> local function get_metamethods() <a href="#L-30"></a> metamethods, get_metamethods = mw.loadData(metamethods_data_module), nil <a href="#L-31"></a> return metamethods <a href="#L-32"></a> end <a href="#L-33"></a> <a href="#L-34"></a>------------------------------------------------------------------------------------ <a href="#L-35"></a>-- <a href="#L-36"></a>-- Helper functions <a href="#L-37"></a>-- <a href="#L-38"></a>------------------------------------------------------------------------------------ <a href="#L-39"></a> <a href="#L-40"></a>local function get_nested(t, k, ...) <a href="#L-41"></a> if t == nil then <a href="#L-42"></a> return nil <a href="#L-43"></a> elseif ... == nil then <a href="#L-44"></a> return t[k] <a href="#L-45"></a> end <a href="#L-46"></a> return get_nested(t[k], ...) <a href="#L-47"></a>end <a href="#L-48"></a> <a href="#L-49"></a>local function set_nested(t, k, v, ...) <a href="#L-50"></a> if ... ~= nil then <a href="#L-51"></a> local t_next = t[k] <a href="#L-52"></a> if t_next == nil then <a href="#L-53"></a> t_next = {} <a href="#L-54"></a> t[k] = t_next <a href="#L-55"></a> end <a href="#L-56"></a> return set_nested(t_next, v, ...) <a href="#L-57"></a> end <a href="#L-58"></a> t[k] = v <a href="#L-59"></a>end <a href="#L-60"></a> <a href="#L-61"></a>local function inherit_metamethods(child, parent) <a href="#L-62"></a> if parent then <a href="#L-63"></a> for method, value in next, parent do <a href="#L-64"></a> if child[method] == nil and (metamethods or get_metamethods())[method] ~= nil then <a href="#L-65"></a> child[method] = value <a href="#L-66"></a> end <a href="#L-67"></a> end <a href="#L-68"></a> end <a href="#L-69"></a> return child <a href="#L-70"></a>end <a href="#L-71"></a> <a href="#L-72"></a>local function signed_index(t, n) <a href="#L-73"></a> return n and n <= 0 and #t + 1 + n or n <a href="#L-74"></a>end <a href="#L-75"></a> <a href="#L-76"></a>local function is_node(value) <a href="#L-77"></a> if value == nil then <a href="#L-78"></a> return false <a href="#L-79"></a> end <a href="#L-80"></a> local mt = getmetatable(value) <a href="#L-81"></a> return not (mt == nil or classes[mt] == nil) <a href="#L-82"></a>end <a href="#L-83"></a> <a href="#L-84"></a>-- Recursively calling tostring() adds to the C stack (limit: 200), whereas <a href="#L-85"></a>-- calling __tostring metamethods directly does not. Occasionally relevant when <a href="#L-86"></a>-- dealing with very deep nesting. <a href="#L-87"></a>local tostring <a href="#L-88"></a>do <a href="#L-89"></a> local _tostring = _G.tostring <a href="#L-90"></a> <a href="#L-91"></a> function tostring(value) <a href="#L-92"></a> if is_node(value) then <a href="#L-93"></a> return value:__tostring(value) <a href="#L-94"></a> end <a href="#L-95"></a> return _tostring(value) <a href="#L-96"></a> end <a href="#L-97"></a>end <a href="#L-98"></a> <a href="#L-99"></a>local function class_else_type(value) <a href="#L-100"></a> if value == nil then <a href="#L-101"></a> return type(value) <a href="#L-102"></a> end <a href="#L-103"></a> local mt = getmetatable(value) <a href="#L-104"></a> if mt == nil then <a href="#L-105"></a> return type(value) <a href="#L-106"></a> end <a href="#L-107"></a> local class = classes[mt] <a href="#L-108"></a> return class == nil and type(value) or class <a href="#L-109"></a>end <a href="#L-110"></a> <a href="#L-111"></a>------------------------------------------------------------------------------------ <a href="#L-112"></a>-- <a href="#L-113"></a>-- Nodes <a href="#L-114"></a>-- <a href="#L-115"></a>------------------------------------------------------------------------------------ <a href="#L-116"></a> <a href="#L-117"></a>local Node = {} <a href="#L-118"></a>Node.__index = Node <a href="#L-119"></a> <a href="#L-120"></a>function Node:next(i) <a href="#L-121"></a> i = i + 1 <a href="#L-122"></a> return self[i], self, i <a href="#L-123"></a>end <a href="#L-124"></a> <a href="#L-125"></a>--[==[ <a href="#L-126"></a>Implements recursive iteration over a node tree. <a href="#L-127"></a> <a href="#L-128"></a>By default, when a node is encountered (which may contain other nodes), it is returned on the first iteration, and then any child nodes are returned on each subsequent iteration; the same process is then followed if any of those children contain nodes themselves. Once a particular node has been fully traversed, the iterator then continues with any sibling nodes. The iterator will use the `next` method of each node to traverse it, which may differ depending on the node class. <a href="#L-129"></a> <a href="#L-130"></a>Each iteration returns three values: `value`, `node` and `key`. Together, these can be used to manipulate the node tree at any given point without needing to know the full structure. Note that when the input node is returned on the first iteration, `node` and `key` will be nil. <a href="#L-131"></a> <a href="#L-132"></a>The optional argument `test` can be used to limit the return values. This should be a function that returns a boolean value, where a return value of true means that the child will be returned by the iterator. If a node is not returned by the iterator, it will still be traversed, as it may contain children that should be returned. <a href="#L-133"></a> <a href="#L-134"></a>The method `iterate_nodes` is provided as a special instance of iterate which uses `is_node` as the test.]==] <a href="#L-135"></a>function Node:iterate(test) <a href="#L-136"></a> local node, k, n, nodes, keys, returned_self = self, 0, 0 <a href="#L-137"></a> -- Special case if `test` is `is_node`. <a href="#L-138"></a> local is_node_is_test = test == is_node <a href="#L-139"></a> <a href="#L-140"></a> return function() <a href="#L-141"></a> if not returned_self then <a href="#L-142"></a> returned_self = true <a href="#L-143"></a> if test == nil or test(self) then <a href="#L-144"></a> return self <a href="#L-145"></a> end <a href="#L-146"></a> end <a href="#L-147"></a> -- Get `v`, which is the value at the current key of the current node. This is probably the first value returned on the last iteration, but checking it manually accounts for any changes made, so that if (for example) the first returned value was a node which is then swapped out or removed in the parent node `node`, the recursive iteration will occur over the new node in its position (if any), not the old node. This allows node trees to be modified dynamically. <a href="#L-148"></a> local v, node_check = node[k], true <a href="#L-149"></a> while true do <a href="#L-150"></a> -- If `v` is a node, memoize the current node and key, then iterate over it. <a href="#L-151"></a> if node_check and is_node(v) then <a href="#L-152"></a> -- `n` is the current memo level. <a href="#L-153"></a> n = n + 1 <a href="#L-154"></a> if nodes then <a href="#L-155"></a> nodes[n], keys[n] = node, k <a href="#L-156"></a> else <a href="#L-157"></a> nodes, keys = {node}, {k} <a href="#L-158"></a> end <a href="#L-159"></a> node, k = v, 0 <a href="#L-160"></a> end <a href="#L-161"></a> v, node, k = node:next(k) <a href="#L-162"></a> -- If `v` is nil, move down one level, then continue iterating the node on that level (if any), or otherwise terminate the loop. <a href="#L-163"></a> if v == nil then <a href="#L-164"></a> if n == 0 then <a href="#L-165"></a> return nil <a href="#L-166"></a> end <a href="#L-167"></a> node, k, n = nodes[n], keys[n], n - 1 <a href="#L-168"></a> elseif test == nil or test(v) then <a href="#L-169"></a> return v, node, k <a href="#L-170"></a> -- If `test` is `is_node`, there's no point checking it again on the next loop. <a href="#L-171"></a> elseif node_check and is_node_is_test then <a href="#L-172"></a> node_check = false <a href="#L-173"></a> end <a href="#L-174"></a> end <a href="#L-175"></a> end <a href="#L-176"></a>end <a href="#L-177"></a> <a href="#L-178"></a>function Node:iterate_nodes() <a href="#L-179"></a> return self:iterate(is_node) <a href="#L-180"></a>end <a href="#L-181"></a> <a href="#L-182"></a>function Node:__tostring() <a href="#L-183"></a> local output = {} <a href="#L-184"></a> for i = 1, #self do <a href="#L-185"></a> insert(output, tostring(self[i])) <a href="#L-186"></a> end <a href="#L-187"></a> return concat(output) <a href="#L-188"></a>end <a href="#L-189"></a> <a href="#L-190"></a>function Node:clone() <a href="#L-191"></a> return deepcopy(self, "keep", true) <a href="#L-192"></a>end <a href="#L-193"></a> <a href="#L-194"></a>function Node:new_class(class) <a href="#L-195"></a> local t = {type = class} <a href="#L-196"></a> t.__index = t <a href="#L-197"></a> t = inherit_metamethods(t, self) <a href="#L-198"></a> classes[t] = class <a href="#L-199"></a> return setmetatable(t, self) <a href="#L-200"></a>end <a href="#L-201"></a> <a href="#L-202"></a>Node.keys_to_remove = {"fail", "handler", "head", "override", "route"} <a href="#L-203"></a> <a href="#L-204"></a>function Node:new(t) <a href="#L-205"></a> setmetatable(t, nil) <a href="#L-206"></a> local keys_to_remove = self.keys_to_remove <a href="#L-207"></a> for i = 1, #keys_to_remove do <a href="#L-208"></a> t[keys_to_remove[i]] = nil <a href="#L-209"></a> end <a href="#L-210"></a> return setmetatable(t, self) <a href="#L-211"></a>end <a href="#L-212"></a> <a href="#L-213"></a>do <a href="#L-214"></a> local Proxy = {} <a href="#L-215"></a> <a href="#L-216"></a> function Proxy:__index(k) <a href="#L-217"></a> local v = Proxy[k] <a href="#L-218"></a> if v ~= nil then <a href="#L-219"></a> return v <a href="#L-220"></a> end <a href="#L-221"></a> return self.__chars[k] <a href="#L-222"></a> end <a href="#L-223"></a> <a href="#L-224"></a> function Proxy:__newindex(k, v) <a href="#L-225"></a> local key = self.__keys[k] <a href="#L-226"></a> if key then <a href="#L-227"></a> self.__chars[k] = v <a href="#L-228"></a> self.__parents[key] = v <a href="#L-229"></a> elseif key == false then <a href="#L-230"></a> error("Character is immutable.") <a href="#L-231"></a> else <a href="#L-232"></a> error("Invalid key.") <a href="#L-233"></a> end <a href="#L-234"></a> end <a href="#L-235"></a> <a href="#L-236"></a> function Proxy:build(a, b, c) <a href="#L-237"></a> local len = self.__len + 1 <a href="#L-238"></a> self.__chars[len] = a <a href="#L-239"></a> self.__parents[len] = b <a href="#L-240"></a> self.__keys[len] = c <a href="#L-241"></a> self.__len = len <a href="#L-242"></a> end <a href="#L-243"></a> <a href="#L-244"></a> function Proxy:iter(i) <a href="#L-245"></a> i = i + 1 <a href="#L-246"></a> local char = self.__chars[i] <a href="#L-247"></a> if char ~= nil then <a href="#L-248"></a> return i, self[i], self, self.__parents[i], self.__keys[i] <a href="#L-249"></a> end <a href="#L-250"></a> end <a href="#L-251"></a> <a href="#L-252"></a> function Node:new_proxy() <a href="#L-253"></a> return setmetatable({ <a href="#L-254"></a> __node = self, <a href="#L-255"></a> __chars = {}, <a href="#L-256"></a> __parents = {}, <a href="#L-257"></a> __keys = {}, <a href="#L-258"></a> __len = 0 <a href="#L-259"></a> }, Proxy) <a href="#L-260"></a> end <a href="#L-261"></a>end <a href="#L-262"></a> <a href="#L-263"></a>------------------------------------------------------------------------------------ <a href="#L-264"></a>-- <a href="#L-265"></a>-- Parser <a href="#L-266"></a>-- <a href="#L-267"></a>------------------------------------------------------------------------------------ <a href="#L-268"></a> <a href="#L-269"></a>local Parser = {} <a href="#L-270"></a>Parser.__index = Parser <a href="#L-271"></a> <a href="#L-272"></a>function Parser:read(delta) <a href="#L-273"></a> local v = self.text[self.head + (delta or 0)] <a href="#L-274"></a> return v == nil and "" or v <a href="#L-275"></a>end <a href="#L-276"></a> <a href="#L-277"></a>function Parser:advance(n) <a href="#L-278"></a> self.head = self.head + (n == nil and 1 or n) <a href="#L-279"></a>end <a href="#L-280"></a> <a href="#L-281"></a>function Parser:layer(n) <a href="#L-282"></a> if n ~= nil then <a href="#L-283"></a> return rawget(self, #self + n) <a href="#L-284"></a> end <a href="#L-285"></a> return self[-1] <a href="#L-286"></a>end <a href="#L-287"></a> <a href="#L-288"></a>function Parser:emit(a, b) <a href="#L-289"></a> local layer = self[-1] <a href="#L-290"></a> if b ~= nil then <a href="#L-291"></a> insert(layer, signed_index(layer, a), b) <a href="#L-292"></a> else <a href="#L-293"></a> rawset(layer, #layer + 1, a) <a href="#L-294"></a> end <a href="#L-295"></a>end <a href="#L-296"></a> <a href="#L-297"></a>function Parser:emit_tokens(a, b) <a href="#L-298"></a> local layer = self[-1] <a href="#L-299"></a> if b ~= nil then <a href="#L-300"></a> a = signed_index(layer, a) <a href="#L-301"></a> for i = 1, #b do <a href="#L-302"></a> insert(layer, a + i - 1, b[i]) <a href="#L-303"></a> end <a href="#L-304"></a> else <a href="#L-305"></a> local len = #layer <a href="#L-306"></a> for i = 1, #a do <a href="#L-307"></a> len = len + 1 <a href="#L-308"></a> rawset(layer, len, a[i]) <a href="#L-309"></a> end <a href="#L-310"></a> end <a href="#L-311"></a>end <a href="#L-312"></a> <a href="#L-313"></a>function Parser:remove(n) <a href="#L-314"></a> local layer = self[-1] <a href="#L-315"></a> if n ~= nil then <a href="#L-316"></a> return remove(layer, signed_index(layer, n)) <a href="#L-317"></a> end <a href="#L-318"></a> local len = #layer <a href="#L-319"></a> local token = layer[len] <a href="#L-320"></a> layer[len] = nil <a href="#L-321"></a> return token <a href="#L-322"></a>end <a href="#L-323"></a> <a href="#L-324"></a>function Parser:replace(a, b) <a href="#L-325"></a> local layer = self[-1] <a href="#L-326"></a> layer[signed_index(layer, a)] = b <a href="#L-327"></a>end <a href="#L-328"></a> <a href="#L-329"></a>-- Unlike default table.concat, this respects __tostring metamethods. <a href="#L-330"></a>function Parser:concat(a, b, c) <a href="#L-331"></a> if a == nil or a > 0 then <a href="#L-332"></a> return self:concat(0, a, b) <a href="#L-333"></a> end <a href="#L-334"></a> local layer, ret, n = self:layer(a), {}, 0 <a href="#L-335"></a> for i = b and signed_index(layer, b) or 1, c and signed_index(layer, c) or #layer do <a href="#L-336"></a> n = n + 1 <a href="#L-337"></a> ret[n] = tostring(layer[i]) <a href="#L-338"></a> end <a href="#L-339"></a> return concat(ret) <a href="#L-340"></a>end <a href="#L-341"></a> <a href="#L-342"></a>function Parser:emitted(delta) <a href="#L-343"></a> if delta == nil then <a href="#L-344"></a> delta = -1 <a href="#L-345"></a> end <a href="#L-346"></a> local i = 0 <a href="#L-347"></a> while true do <a href="#L-348"></a> local layer = self:layer(i) <a href="#L-349"></a> if layer == nil then <a href="#L-350"></a> return nil <a href="#L-351"></a> end <a href="#L-352"></a> local layer_len = #layer <a href="#L-353"></a> if -delta <= layer_len then <a href="#L-354"></a> return rawget(layer, layer_len + delta + 1) <a href="#L-355"></a> end <a href="#L-356"></a> delta = delta + layer_len <a href="#L-357"></a> i = i - 1 <a href="#L-358"></a> end <a href="#L-359"></a>end <a href="#L-360"></a> <a href="#L-361"></a>function Parser:push(route) <a href="#L-362"></a> local layer = { <a href="#L-363"></a> head = self.head, <a href="#L-364"></a> route = route <a href="#L-365"></a> } <a href="#L-366"></a> self[#self + 1] = layer <a href="#L-367"></a> self[-1] = layer <a href="#L-368"></a>end <a href="#L-369"></a> <a href="#L-370"></a>function Parser:push_sublayer(handler, inherit) <a href="#L-371"></a> local sublayer = { <a href="#L-372"></a> handler = handler, <a href="#L-373"></a> sublayer = true <a href="#L-374"></a> } <a href="#L-375"></a> if inherit then <a href="#L-376"></a> local layer = self[-1] <a href="#L-377"></a> setmetatable(sublayer, inherit_metamethods({ <a href="#L-378"></a> __index = layer, <a href="#L-379"></a> __newindex = layer <a href="#L-380"></a> }, getmetatable(layer))) <a href="#L-381"></a> end <a href="#L-382"></a> self[#self + 1] = sublayer <a href="#L-383"></a> self[-1] = sublayer <a href="#L-384"></a>end <a href="#L-385"></a> <a href="#L-386"></a>function Parser:pop() <a href="#L-387"></a> local len, layer = #self <a href="#L-388"></a> while true do <a href="#L-389"></a> layer = self[len] <a href="#L-390"></a> self[len] = nil <a href="#L-391"></a> len = len - 1 <a href="#L-392"></a> local new = self[len] <a href="#L-393"></a> self[-1] = new == nil and self or new <a href="#L-394"></a> if layer.sublayer == nil then <a href="#L-395"></a> break <a href="#L-396"></a> end <a href="#L-397"></a> self:emit_tokens(layer) <a href="#L-398"></a> end <a href="#L-399"></a> return layer <a href="#L-400"></a>end <a href="#L-401"></a> <a href="#L-402"></a>function Parser:pop_sublayer() <a href="#L-403"></a> local len, layer = #self, self[-1] <a href="#L-404"></a> self[len] = nil <a href="#L-405"></a> local new = self[len - 1] <a href="#L-406"></a> self[-1] = new == nil and self or new <a href="#L-407"></a> setmetatable(layer, nil) <a href="#L-408"></a> layer.sublayer = nil <a href="#L-409"></a> return layer <a href="#L-410"></a>end <a href="#L-411"></a> <a href="#L-412"></a>function Parser:get(route, ...) <a href="#L-413"></a> self:push(route) <a href="#L-414"></a> local layer = route(self, ...) <a href="#L-415"></a> if layer == nil then <a href="#L-416"></a> layer = self:traverse() <a href="#L-417"></a> end <a href="#L-418"></a> return layer <a href="#L-419"></a>end <a href="#L-420"></a> <a href="#L-421"></a>function Parser:try(route, ...) <a href="#L-422"></a> local failed_layer = get_nested(self.failed_routes, route, self.head) <a href="#L-423"></a> if failed_layer ~= nil then <a href="#L-424"></a> return false, failed_layer <a href="#L-425"></a> end <a href="#L-426"></a> local layer = self:get(route, ...) <a href="#L-427"></a> return not layer.fail, layer <a href="#L-428"></a>end <a href="#L-429"></a> <a href="#L-430"></a>function Parser:consume(this, ...) <a href="#L-431"></a> local layer = self[-1] <a href="#L-432"></a> if this == nil then <a href="#L-433"></a> this = self:read() <a href="#L-434"></a> end <a href="#L-435"></a> return (layer.override or layer.handler)(self, this, ...) <a href="#L-436"></a>end <a href="#L-437"></a> <a href="#L-438"></a>function Parser:fail_route() <a href="#L-439"></a> local layer = self:pop() <a href="#L-440"></a> layer.fail = true <a href="#L-441"></a> set_nested(self, "failed_routes", layer.route, layer.head, layer) <a href="#L-442"></a> self.head = layer.head <a href="#L-443"></a> return layer <a href="#L-444"></a>end <a href="#L-445"></a> <a href="#L-446"></a>function Parser:traverse() <a href="#L-447"></a> while true do <a href="#L-448"></a> local layer = self:consume() <a href="#L-449"></a> if layer ~= nil then <a href="#L-450"></a> return layer <a href="#L-451"></a> end <a href="#L-452"></a> self:advance() <a href="#L-453"></a> end <a href="#L-454"></a>end <a href="#L-455"></a> <a href="#L-456"></a>-- Converts a handler into a switch table the first time it's called, which avoids creating unnecessary objects, and prevents any scoping issues caused by parser methods being assigned to table keys before they've been declared. <a href="#L-457"></a>-- false is used as the default key. <a href="#L-458"></a>do <a href="#L-459"></a> local Switch = {} <a href="#L-460"></a> <a href="#L-461"></a> function Switch:__call(parser, this) <a href="#L-462"></a> return (self[this] or self[false])(parser, this) <a href="#L-463"></a> end <a href="#L-464"></a> <a href="#L-465"></a> function Parser:switch(func, t) <a href="#L-466"></a> local layer = self[-1] <a href="#L-467"></a> -- Point handler to the new switch table if the calling function is the current handler. <a href="#L-468"></a> if layer.handler == func then <a href="#L-469"></a> layer.handler = t <a href="#L-470"></a> end <a href="#L-471"></a> return setmetatable(t, Switch) <a href="#L-472"></a> end <a href="#L-473"></a>end <a href="#L-474"></a> <a href="#L-475"></a>-- Generate a new parser class object, which is used as the template for any parser objects. These should be customized with additional/modified methods as needed. <a href="#L-476"></a>function Parser:new_class() <a href="#L-477"></a> local t = {} <a href="#L-478"></a> t.__index = t <a href="#L-479"></a> return setmetatable(inherit_metamethods(t, self), self) <a href="#L-480"></a>end <a href="#L-481"></a> <a href="#L-482"></a>-- Generate a new parser object, which is used for a specific parse. <a href="#L-483"></a>function Parser:new(text) <a href="#L-484"></a> return setmetatable({ <a href="#L-485"></a> text = text, <a href="#L-486"></a> head = 1 <a href="#L-487"></a> }, self) <a href="#L-488"></a>end <a href="#L-489"></a> <a href="#L-490"></a>function Parser:parse(data) <a href="#L-491"></a> local parser = self:new(data.text) <a href="#L-492"></a> local success, tokens = parser:try(unpack(data.route)) <a href="#L-493"></a> if #parser > 0 then <a href="#L-494"></a> -- This shouldn't happen. <a href="#L-495"></a> error("Parser exited with non-empty stack.") <a href="#L-496"></a> elseif success then <a href="#L-497"></a> local node = data.node <a href="#L-498"></a> return true, node[1]:new(tokens, unpack(node, 2)), parser <a href="#L-499"></a> elseif data.allow_fail then <a href="#L-500"></a> return false, nil, parser <a href="#L-501"></a> end <a href="#L-502"></a> error("Parser exited with failed route.") <a href="#L-503"></a>end <a href="#L-504"></a> <a href="#L-505"></a>export.class_else_type = class_else_type <a href="#L-506"></a>export.is_node = is_node <a href="#L-507"></a>export.tostring = tostring <a href="#L-508"></a> <a href="#L-509"></a>function export.new() <a href="#L-510"></a> return Parser:new_class(), Node:new_class("node") <a href="#L-511"></a>end <a href="#L-512"></a> <a href="#L-513"></a>return export </pre></div></div><noscript><img src="https://login.wikimedia.org/wiki/Special:CentralAutoLogin/start?type=1x1&useformat=desktop" alt="" width="1" height="1" style="border: none; position: absolute;"></noscript> <div class="printfooter" data-nosnippet="">Retrieved from "<a dir="ltr" href="https://en.wiktionary.org/w/index.php?title=Module:parser&oldid=82792584">https://en.wiktionary.org/w/index.php?title=Module:parser&oldid=82792584</a>"</div></div> <div id="catlinks" class="catlinks" data-mw="interface"><div id="mw-normal-catlinks" class="mw-normal-catlinks"><a href="/wiki/Special:Categories" title="Special:Categories">Categories</a>: <ul><li><a href="/wiki/Category:Templates_and_modules_needing_documentation" title="Category:Templates and modules needing documentation">Templates and modules needing documentation</a></li><li><a href="/wiki/Category:Wikitext_parsing_modules" title="Category:Wikitext parsing modules">Wikitext parsing modules</a></li></ul></div></div> </div> </main> </div> <div class="mw-footer-container"> <footer id="footer" class="mw-footer" > <ul id="footer-info"> <li id="footer-info-lastmod"> This page was last edited on 29 November 2024, at 11:24.</li> <li id="footer-info-copyright">Definitions and other text are available under the <a rel="nofollow" class="external text" href="//creativecommons.org/licenses/by-sa/4.0/">Creative Commons Attribution-ShareAlike License</a>; additional terms may apply. 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