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Module:parser: difference between revisions - Wiktionary, the free dictionary

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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" ><span class="vector-icon mw-ui-icon-language-progressive mw-ui-icon-wikimedia-language-progressive"></span> <span class="vector-dropdown-label-text">18 languages</span> </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"><span>العربية</span></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"><span>বাংলা</span></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"><span>Banjar</span></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"><span>Hornjoserbsce</span></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"><span>Кыргызча</span></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"><span>Malti</span></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"><span>ဘာသာမန်</span></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"><span>Bahasa Melayu</span></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"><span>မြန်မာဘာသာ</span></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"><span>日本語</span></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"><span>ਪੰਜਾਬੀ</span></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"><span>සිංහල</span></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"><span>کوردی</span></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"><span>Српски / srpski</span></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"><span>ၽႃႇသႃႇတႆး </span></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" data-language-local-name="Thai" class="interlanguage-link-target"><span>ไทย</span></a></li><li class="interlanguage-link interwiki-vi mw-list-item"><a href="https://vi.wiktionary.org/wiki/M%C3%B4_%C4%91un:parser" title="Mô đun:parser – Vietnamese" lang="vi" hreflang="vi" data-title="Mô đun:parser" data-language-autonym="Tiếng Việt" data-language-local-name="Vietnamese" class="interlanguage-link-target"><span>Tiếng Việt</span></a></li><li class="interlanguage-link interwiki-zh mw-list-item"><a href="https://zh.wiktionary.org/wiki/Module:Parser" title="Module:Parser – Chinese" lang="zh" hreflang="zh" data-title="Module:Parser" data-language-autonym="中文" data-language-local-name="Chinese" 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href="/wiki/User:Theknightwho" class="mw-userlink" title="User:Theknightwho" data-mw-revid="82788777"><bdi>Theknightwho</bdi></a> <span class="mw-usertoollinks">(<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>)</span><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"><span>171,887</span> edits</div></div></div><div id="mw-diff-otitle3"> <span class="comment comment--without-parentheses">Remove now-unused __pairs metamethod and unused rawpairs method.</span></div><div id="mw-diff-otitle5"></div><div id="mw-diff-otitle4"><a href="/w/index.php?title=Module:parser&amp;diff=prev&amp;oldid=82788777" 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"><strong><a href="/w/index.php?title=Module:parser&amp;oldid=82789053" title="Module:parser">Revision as of 22:41, 28 November 2024</a> <span class="mw-diff-edit"><a href="/w/index.php?title=Module:parser&amp;action=edit&amp;oldid=82789053" title="Module:parser">view source</a></span><span class="mw-diff-timestamp" data-timestamp="2024-11-28T22:41:11Z"></span> </strong></div><div id="mw-diff-ntitle2"><a href="/wiki/User:Theknightwho" class="mw-userlink" title="User:Theknightwho" data-mw-revid="82789053"><bdi>Theknightwho</bdi></a> <span class="mw-usertoollinks">(<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>)</span><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"><span>171,887</span> edits</div></div></div><div id="mw-diff-ntitle3"> <span class="comment comment--without-parentheses">Optimise the node iterators, to reduce the number of unnecessary function calls.</span></div><div id="mw-diff-ntitle5"></div><div id="mw-diff-ntitle4"><a href="/w/index.php?title=Module:parser&amp;diff=next&amp;oldid=82789053" title="Module:parser" id="differences-nextlink">Go to next edit →</a></div></td> </tr><tr> <td colspan="2" class="diff-lineno">Line 118:</td> <td colspan="2" class="diff-lineno">Line 118:</td> </tr> <tr> <td class="diff-marker"></td> <td class="diff-context diff-side-deleted"><div>do</div></td> <td class="diff-marker"></td> <td class="diff-context diff-side-added"><div>do</div></td> </tr> <tr> <td class="diff-marker"></td> <td class="diff-context diff-side-deleted"><div> local Iterator1, Iterator2 = {}, {}</div></td> <td class="diff-marker"></td> <td class="diff-context diff-side-added"><div> local Iterator1, Iterator2 = {}, {}</div></td> </tr> <tr> <td class="diff-marker" data-marker="−"></td> <td class="diff-deletedline diff-side-deleted"><div> Iterator1.__index = Iterator2 -- Not a typo.</div></td> <td colspan="2" class="diff-empty diff-side-added"></td> </tr> <tr> <td class="diff-marker"></td> <td class="diff-context diff-side-deleted"><div> Iterator2.__index = Iterator2</div></td> <td class="diff-marker"></td> <td class="diff-context diff-side-added"><div> Iterator2.__index = Iterator2</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 colspan="2" class="diff-empty diff-side-deleted"></td> <td class="diff-marker" data-marker="+"></td> <td class="diff-addedline diff-side-added"><div> -- Only called on the first iteration, to return the calling node.</div></td> </tr> <tr> <td class="diff-marker"></td> <td class="diff-context diff-side-deleted"><div> function Iterator1:__call()</div></td> <td class="diff-marker"></td> <td class="diff-context diff-side-added"><div> function Iterator1:__call()</div></td> </tr> <tr> <td class="diff-marker"></td> <td class="diff-context diff-side-deleted"><div> setmetatable(self, Iterator2)</div></td> <td class="diff-marker"></td> <td class="diff-context diff-side-added"><div> setmetatable(self, Iterator2)</div></td> </tr> <tr> <td colspan="2" class="diff-lineno">Line 126:</td> <td colspan="2" class="diff-lineno">Line 126:</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> <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 colspan="2" class="diff-empty diff-side-deleted"></td> <td class="diff-marker" data-marker="+"></td> <td class="diff-addedline diff-side-added"><div> -- Catches an arbitrary number of returned values, which avoids the need to do it with a new table each time.</div></td> </tr> <tr> <td class="diff-marker" data-marker="−"></td> <td class="diff-deletedline diff-side-deleted"><div> function Iterator2:<del class="diffchange diffchange-inline">push</del>(<del class="diffchange diffchange-inline">node</del>)</div></td> <td class="diff-marker" data-marker="+"></td> <td class="diff-addedline diff-side-added"><div> function Iterator2:<ins class="diffchange diffchange-inline">catch_values</ins>(<ins class="diffchange diffchange-inline">layer, ...</ins>)</div></td> </tr> <tr> <td class="diff-marker"><a class="mw-diff-movedpara-left" title="Paragraph was moved. Click to jump to new location." href="#movedpara_27_0_rhs">&#x26AB;</a></td> <td class="diff-deletedline diff-side-deleted"><div><a name="movedpara_8_0_lhs"></a> local layer = {</div></td> <td colspan="2" class="diff-empty diff-side-added"></td> </tr> <tr> <td class="diff-marker"><a class="mw-diff-movedpara-left" title="Paragraph was moved. Click to jump to new location." href="#movedpara_29_0_rhs">&#x26AB;</a></td> <td class="diff-deletedline diff-side-deleted"><div><a name="movedpara_9_0_lhs"></a> <del class="diffchange diffchange-inline">k = 0</del>,</div></td> <td colspan="2" class="diff-empty diff-side-added"></td> </tr> <tr> <td class="diff-marker" data-marker="−"></td> <td class="diff-deletedline diff-side-deleted"><div> node = node</div></td> <td colspan="2" class="diff-empty diff-side-added"></td> </tr> <tr> <td class="diff-marker" data-marker="−"></td> <td class="diff-deletedline diff-side-deleted"><div> }</div></td> <td colspan="2" class="diff-empty diff-side-added"></td> </tr> <tr> <td class="diff-marker"><a class="mw-diff-movedpara-left" title="Paragraph was moved. Click to jump to new location." href="#movedpara_31_0_rhs">&#x26AB;</a></td> <td class="diff-deletedline diff-side-deleted"><div><a name="movedpara_9_3_lhs"></a> <del class="diffchange diffchange-inline">self</del>[<del class="diffchange diffchange-inline">#self + </del>1] = layer</div></td> <td colspan="2" class="diff-empty diff-side-added"></td> </tr> <tr> <td class="diff-marker" data-marker="−"></td> <td class="diff-deletedline diff-side-deleted"><div> self[-1] = layer</div></td> <td colspan="2" class="diff-empty diff-side-added"></td> </tr> <tr> <td class="diff-marker" data-marker="−"></td> <td class="diff-deletedline diff-side-deleted"><div> return self</div></td> <td colspan="2" class="diff-empty diff-side-added"></td> </tr> <tr> <td class="diff-marker"><a class="mw-diff-movedpara-left" title="Paragraph was moved. Click to jump to new location." href="#movedpara_39_0_rhs">&#x26AB;</a></td> <td class="diff-deletedline diff-side-deleted"><div><a name="movedpara_9_6_lhs"></a><del class="diffchange diffchange-inline"> </del>end</div></td> <td colspan="2" class="diff-empty diff-side-added"></td> </tr> <tr> <td class="diff-marker" data-marker="−"></td> <td class="diff-deletedline diff-side-deleted"><div> </div></td> <td colspan="2" class="diff-empty diff-side-added"></td> </tr> <tr> <td class="diff-marker" data-marker="−"></td> <td class="diff-deletedline diff-side-deleted"><div> function Iterator2:pop()</div></td> <td colspan="2" class="diff-empty diff-side-added"></td> </tr> <tr> <td class="diff-marker" data-marker="−"></td> <td class="diff-deletedline diff-side-deleted"><div> local len = #self</div></td> <td colspan="2" class="diff-empty diff-side-added"></td> </tr> <tr> <td class="diff-marker" data-marker="−"></td> <td class="diff-deletedline diff-side-deleted"><div> self[len] = nil</div></td> <td colspan="2" class="diff-empty diff-side-added"></td> </tr> <tr> <td class="diff-marker"><a class="mw-diff-movedpara-left" title="Paragraph was moved. Click to jump to new location." href="#movedpara_14_0_rhs">&#x26AB;</a></td> <td class="diff-deletedline diff-side-deleted"><div><a name="movedpara_9_11_lhs"></a> <del class="diffchange diffchange-inline">self[-1]</del> = self[<del class="diffchange diffchange-inline">len</del> - 1]</div></td> <td colspan="2" class="diff-empty diff-side-added"></td> </tr> <tr> <td class="diff-marker" data-marker="−"></td> <td class="diff-deletedline diff-side-deleted"><div> end</div></td> <td colspan="2" class="diff-empty diff-side-added"></td> </tr> <tr> <td class="diff-marker" data-marker="−"></td> <td class="diff-deletedline diff-side-deleted"><div> </div></td> <td colspan="2" class="diff-empty diff-side-added"></td> </tr> <tr> <td class="diff-marker" data-marker="−"></td> <td class="diff-deletedline diff-side-deleted"><div> function Iterator2:iterate(layer, ...)</div></td> <td colspan="2" class="diff-empty diff-side-added"></td> </tr> <tr> <td class="diff-marker"></td> <td class="diff-context diff-side-deleted"><div> local v, node, k = ...</div></td> <td class="diff-marker"></td> <td class="diff-context diff-side-added"><div> local v, node, k = ...</div></td> </tr> <tr> <td class="diff-marker"></td> <td class="diff-context diff-side-deleted"><div> if v ~= nil then</div></td> <td class="diff-marker"></td> <td class="diff-context diff-side-added"><div> if v ~= nil then</div></td> </tr> <tr> <td colspan="2" class="diff-lineno">Line 148:</td> <td colspan="2" class="diff-lineno">Line 133:</td> </tr> <tr> <td class="diff-marker"></td> <td class="diff-context diff-side-deleted"><div> return ...</div></td> <td class="diff-marker"></td> <td class="diff-context diff-side-added"><div> return ...</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> <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> -- If `v` is nil, pop the stack, and continue iterating over the layer below if there is one; otherwise, terminate.</div></td> </tr> <tr> <td class="diff-marker" data-marker="−"></td> <td class="diff-deletedline diff-side-deleted"><div> self:pop()</div></td> <td colspan="2" class="diff-empty diff-side-added"></td> </tr> <tr> <td class="diff-marker" data-marker="−"></td> <td class="diff-deletedline diff-side-deleted"><div> <del class="diffchange diffchange-inline">layer</del> = self<del class="diffchange diffchange-inline">[-1]</del></div></td> <td class="diff-marker" data-marker="+"></td> <td class="diff-addedline diff-side-added"><div> <ins class="diffchange diffchange-inline">local self_len</ins> = <ins class="diffchange diffchange-inline">#</ins>self</div></td> </tr> <tr> <td colspan="2" class="diff-empty diff-side-deleted"></td> <td class="diff-marker"><a class="mw-diff-movedpara-right" title="Paragraph was moved. Click to jump to old location." href="#movedpara_9_11_lhs">&#x26AB;</a></td> <td class="diff-addedline diff-side-added"><div><a name="movedpara_14_0_rhs"></a> <ins class="diffchange diffchange-inline">layer</ins> = self[<ins class="diffchange diffchange-inline">self_len</ins> - 1]</div></td> </tr> <tr> <td class="diff-marker"></td> <td class="diff-context diff-side-deleted"><div> if layer ~= nil then</div></td> <td class="diff-marker"></td> <td class="diff-context diff-side-added"><div> if layer ~= nil then</div></td> </tr> <tr> <td class="diff-marker" data-marker="−"></td> <td class="diff-deletedline diff-side-deleted"><div> node = layer.node</div></td> <td class="diff-marker" data-marker="+"></td> <td class="diff-addedline diff-side-added"><div> <ins class="diffchange diffchange-inline">self[self_len], self[-1], </ins>node =<ins class="diffchange diffchange-inline"> nil, layer,</ins> layer.node</div></td> </tr> <tr> <td class="diff-marker" data-marker="−"></td> <td class="diff-deletedline diff-side-deleted"><div> return self:<del class="diffchange diffchange-inline">iterate</del>(layer, node[self.next_func](node, layer.k))</div></td> <td class="diff-marker" data-marker="+"></td> <td class="diff-addedline diff-side-added"><div> return self:<ins class="diffchange diffchange-inline">catch_values</ins>(layer, node[self.next_func](node, layer.k))</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> <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> <tr> <td colspan="2" class="diff-lineno">Line 159:</td> <td colspan="2" class="diff-lineno">Line 145:</td> </tr> <tr> <td class="diff-marker"></td> <td class="diff-context diff-side-deleted"><div> local layer = self[-1]</div></td> <td class="diff-marker"></td> <td class="diff-context diff-side-added"><div> local layer = self[-1]</div></td> </tr> <tr> <td class="diff-marker"></td> <td class="diff-context diff-side-deleted"><div> local node, k = layer.node, layer.k</div></td> <td class="diff-marker"></td> <td class="diff-context diff-side-added"><div> local node, k = layer.node, layer.k</div></td> </tr> <tr> <td class="diff-marker" data-marker="−"></td> <td class="diff-deletedline diff-side-deleted"><div> local <del class="diffchange diffchange-inline">curr_val</del> = node[k]</div></td> <td class="diff-marker" data-marker="+"></td> <td class="diff-addedline diff-side-added"><div> local <ins class="diffchange diffchange-inline">v</ins> = node[k]</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> -- If `v` is a node, push a new layer onto the stack and iterate over it.</div></td> </tr> <tr> <td class="diff-marker" data-marker="−"></td> <td class="diff-deletedline diff-side-deleted"><div> if is_node(<del class="diffchange diffchange-inline">curr_val</del>) then</div></td> <td class="diff-marker" data-marker="+"></td> <td class="diff-addedline diff-side-added"><div> if is_node(<ins class="diffchange diffchange-inline">v</ins>) then</div></td> </tr> <tr> <td class="diff-marker" data-marker="−"></td> <td class="diff-deletedline diff-side-deleted"><div> self:push(curr_val)</div></td> <td colspan="2" class="diff-empty diff-side-added"></td> </tr> <tr> <td class="diff-marker" data-marker="−"></td> <td class="diff-deletedline diff-side-deleted"><div> layer = <del class="diffchange diffchange-inline">self[-1]</del></div></td> <td class="diff-marker" data-marker="+"></td> <td class="diff-addedline diff-side-added"><div> layer<ins class="diffchange diffchange-inline">, k, node</ins> = <ins class="diffchange diffchange-inline">{k = 0, node = v}, 0, v</ins></div></td> </tr> <tr> <td class="diff-marker" data-marker="−"></td> <td class="diff-deletedline diff-side-deleted"><div> <del class="diffchange diffchange-inline">node</del>, <del class="diffchange diffchange-inline">k</del> = layer<del class="diffchange diffchange-inline">.node</del>, layer<del class="diffchange diffchange-inline">.k</del></div></td> <td class="diff-marker" data-marker="+"></td> <td class="diff-addedline diff-side-added"><div> <ins class="diffchange diffchange-inline">self[#self + 1]</ins>, <ins class="diffchange diffchange-inline">self[-1]</ins> = layer, layer</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> <tr> <td class="diff-marker" data-marker="−"></td> <td class="diff-deletedline diff-side-deleted"><div> return self:<del class="diffchange diffchange-inline">iterate</del>(layer, node[self.next_func](node, k))</div></td> <td class="diff-marker" data-marker="+"></td> <td class="diff-addedline diff-side-added"><div> return self:<ins class="diffchange diffchange-inline">catch_values</ins>(layer, node[self.next_func](node, k))</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> <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> function Node:iterate(next_func)</div></td> <td class="diff-marker"></td> <td class="diff-context diff-side-added"><div> function Node:iterate(next_func)</div></td> </tr> <tr> <td colspan="2" class="diff-empty diff-side-deleted"></td> <td class="diff-marker"><a class="mw-diff-movedpara-right" title="Paragraph was moved. Click to jump to old location." href="#movedpara_8_0_lhs">&#x26AB;</a></td> <td class="diff-addedline diff-side-added"><div><a name="movedpara_27_0_rhs"></a> local layer = {<ins class="diffchange diffchange-inline">k = 0, node = self}</ins></div></td> </tr> <tr> <td class="diff-marker"></td> <td class="diff-context diff-side-deleted"><div> return setmetatable({</div></td> <td class="diff-marker"></td> <td class="diff-context diff-side-added"><div> return setmetatable({</div></td> </tr> <tr> <td colspan="2" class="diff-empty diff-side-deleted"></td> <td class="diff-marker"><a class="mw-diff-movedpara-right" title="Paragraph was moved. Click to jump to old location." href="#movedpara_9_0_lhs">&#x26AB;</a></td> <td class="diff-addedline diff-side-added"><div><a name="movedpara_29_0_rhs"></a> <ins class="diffchange diffchange-inline">layer</ins>,</div></td> </tr> <tr> <td class="diff-marker"><a class="mw-diff-movedpara-left" title="Paragraph was moved. Click to jump to new location." href="#movedpara_33_0_rhs">&#x26AB;</a></td> <td class="diff-deletedline diff-side-deleted"><div><a name="movedpara_30_0_lhs"></a> next_func = next_func == nil and "next" or next_func</div></td> <td colspan="2" class="diff-empty diff-side-added"></td> </tr> <tr> <td colspan="2" class="diff-empty diff-side-deleted"></td> <td class="diff-marker"><a class="mw-diff-movedpara-right" title="Paragraph was moved. Click to jump to old location." href="#movedpara_9_3_lhs">&#x26AB;</a></td> <td class="diff-addedline diff-side-added"><div><a name="movedpara_31_0_rhs"></a> <ins class="diffchange diffchange-inline"> </ins>[<ins class="diffchange diffchange-inline">-</ins>1] = layer<ins class="diffchange diffchange-inline">,</ins></div></td> </tr> <tr> <td class="diff-marker"><a class="mw-diff-movedpara-left" title="Paragraph was moved. Click to jump to new location." href="#movedpara_35_0_rhs">&#x26AB;</a></td> <td class="diff-deletedline diff-side-deleted"><div><a name="movedpara_32_0_lhs"></a> }, Iterator1<del class="diffchange diffchange-inline">):push(self</del>)</div></td> <td colspan="2" class="diff-empty diff-side-added"></td> </tr> <tr> <td colspan="2" class="diff-empty diff-side-deleted"></td> <td class="diff-marker"><a class="mw-diff-movedpara-right" title="Paragraph was moved. Click to jump to old location." href="#movedpara_30_0_lhs">&#x26AB;</a></td> <td class="diff-addedline diff-side-added"><div><a name="movedpara_33_0_rhs"></a> next_func = next_func == nil and "next" or next_func<ins class="diffchange diffchange-inline">,</ins></div></td> </tr> <tr> <td class="diff-marker" data-marker="−"></td> <td class="diff-deletedline diff-side-deleted"><div> end</div></td> <td colspan="2" class="diff-empty diff-side-added"></td> </tr> <tr> <td colspan="2" class="diff-empty diff-side-deleted"></td> <td class="diff-marker"><a class="mw-diff-movedpara-right" title="Paragraph was moved. Click to jump to old location." href="#movedpara_32_0_lhs">&#x26AB;</a></td> <td class="diff-addedline diff-side-added"><div><a name="movedpara_35_0_rhs"></a> }, Iterator1)</div></td> </tr> <tr> <td class="diff-marker" data-marker="−"></td> <td class="diff-deletedline diff-side-deleted"><div> </div></td> <td colspan="2" class="diff-empty diff-side-added"></td> </tr> <tr> <td class="diff-marker"><a class="mw-diff-movedpara-left" title="Paragraph was moved. Click to jump to new location." href="#movedpara_39_2_rhs">&#x26AB;</a></td> <td class="diff-deletedline diff-side-deleted"><div><a name="movedpara_37_0_lhs"></a><del class="diffchange diffchange-inline"> </del>function Node:iterate_nodes()</div></td> <td colspan="2" class="diff-empty diff-side-added"></td> </tr> <tr> <td class="diff-marker"><a class="mw-diff-movedpara-left" title="Paragraph was moved. Click to jump to new location." href="#movedpara_39_3_rhs">&#x26AB;</a></td> <td class="diff-deletedline diff-side-deleted"><div><a name="movedpara_37_1_lhs"></a><del class="diffchange diffchange-inline"> </del>return self:iterate("next_node")</div></td> <td colspan="2" class="diff-empty diff-side-added"></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> <tr> <td colspan="2" class="diff-empty diff-side-deleted"></td> <td class="diff-marker"><a class="mw-diff-movedpara-right" title="Paragraph was moved. Click to jump to old location." href="#movedpara_9_6_lhs">&#x26AB;</a></td> <td class="diff-addedline diff-side-added"><div><a name="movedpara_39_0_rhs"></a>end</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"><br /></td> </tr> <tr> <td colspan="2" class="diff-empty diff-side-deleted"></td> <td class="diff-marker"><a class="mw-diff-movedpara-right" title="Paragraph was moved. Click to jump to old location." href="#movedpara_37_0_lhs">&#x26AB;</a></td> <td class="diff-addedline diff-side-added"><div><a name="movedpara_39_2_rhs"></a>function Node:iterate_nodes()</div></td> </tr> <tr> <td colspan="2" class="diff-empty diff-side-deleted"></td> <td class="diff-marker"><a class="mw-diff-movedpara-right" title="Paragraph was moved. Click to jump to old location." href="#movedpara_37_1_lhs">&#x26AB;</a></td> <td class="diff-addedline diff-side-added"><div><a name="movedpara_39_3_rhs"></a><ins class="diffchange diffchange-inline"> </ins>return self:iterate("next_node")</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> <tr> <td class="diff-marker"></td> <td class="diff-context diff-side-deleted"><br /></td> <td class="diff-marker"></td> <td class="diff-context diff-side-added"><br /></td> </tr> <!-- diff cache key enwiktionary:diff:1.41:old-82788777:rev-82789053:wikidiff2=table:1.14.1:ff290eae --> </table><hr class='diff-hr' id='mw-oldid' /> <h2 class='diff-currentversion-title'>Revision as of 22:41, 28 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><i style="font-size: larger;">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>. <sup>[<a class="external text" href="https://en.wiktionary.org/w/index.php?title=Module:parser/documentation&amp;action=edit">edit</a>]</sup></i></dd><dd> <i>Useful links</i>: <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&amp;hideredirs=1&amp;hidetrans=1">links</a> • <a class="external text" href="https://en.wiktionary.org/w/index.php?title=Special%3AWhatLinksHere%2FModule%3Aparser&amp;hidelinks=1&amp;hideredirs=1">transclusions</a> • <a href="/w/index.php?title=Module:parser/testcases&amp;action=edit&amp;redlink=1" class="new" title="Module:parser/testcases (page does not exist)">testcases</a> • <a href="/w/index.php?title=Module:parser/sandbox&amp;action=edit&amp;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 .maintenance-box{width:90%;margin:0.75em auto;border-width:1px;border-style:dashed;padding:0.25em}.mw-parser-output .request-box{width:90%;margin:0.75em auto;border:1px dashed var(--border-color-base,#999999);padding:0.25em;background:var(--background-color-base,#FFFFFF)}body.skin-minerva .mw-parser-output .request-box table{margin-top:0.25em;margin-bottom:0.25em}.mw-parser-output .maintenance-box-blue{background-color:#E6E6FF;border-color:#000061}.mw-parser-output .maintenance-box-red{background-color:#FFE6E6;border-color:#610000}.mw-parser-output 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.maintenance-box-blue{background-color:#1D1D44;border-color:#73737F}html.skin-theme-clientpref-os .mw-parser-output .maintenance-box-red{background-color:#441D1D;border-color:#7F7373}html.skin-theme-clientpref-os .mw-parser-output .maintenance-box-yellow{background-color:#323216;border-color:#7F7F73}html.skin-theme-clientpref-os .mw-parser-output .maintenance-box-grey{background-color:#303030;border-color:#797979}html.skin-theme-clientpref-os .mw-parser-output .maintenance-box-orange{background-color:#44301D;border-color:#7F7973}}</style><div class="noprint maintenance-box maintenance-box-blue"> <table> <tbody><tr> <td rowspan="2"><span typeof="mw:File"><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></span> </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> <br style="clear: both;" /></div> <div class="mw-highlight mw-highlight-lang-lua mw-content-ltr mw-highlight-lines" dir="ltr"><pre><span></span><span id="L-1"><a href="#L-1"><span class="linenos" data-line="1"></span></a><span class="kd">local</span> <span class="n">export</span> <span class="o">=</span> <span class="p">{}</span> </span><span id="L-2"><a href="#L-2"><span class="linenos" data-line="2"></span></a> </span><span id="L-3"><a href="#L-3"><span class="linenos" data-line="3"></span></a><span class="kd">local</span> <span class="n">concat</span> <span class="o">=</span> <span class="nb">table.concat</span> </span><span id="L-4"><a href="#L-4"><span class="linenos" data-line="4"></span></a><span class="kd">local</span> <span class="n">deepcopy</span> <span class="c1">-- Assigned when needed.</span> </span><span id="L-5"><a href="#L-5"><span class="linenos" data-line="5"></span></a><span class="kd">local</span> <span class="nb">getmetatable</span> <span class="o">=</span> <span class="nb">getmetatable</span> </span><span id="L-6"><a href="#L-6"><span class="linenos" data-line="6"></span></a><span class="kd">local</span> <span class="n">insert</span> <span class="o">=</span> <span class="nb">table.insert</span> </span><span id="L-7"><a href="#L-7"><span class="linenos" data-line="7"></span></a><span class="kd">local</span> <span class="nb">next</span> <span class="o">=</span> <span class="nb">next</span> </span><span id="L-8"><a href="#L-8"><span class="linenos" data-line="8"></span></a><span class="kd">local</span> <span class="nb">rawget</span> <span class="o">=</span> <span class="nb">rawget</span> </span><span id="L-9"><a href="#L-9"><span class="linenos" data-line="9"></span></a><span class="kd">local</span> <span class="nb">rawset</span> <span class="o">=</span> <span class="nb">rawset</span> </span><span id="L-10"><a href="#L-10"><span class="linenos" data-line="10"></span></a><span class="kd">local</span> <span class="n">remove</span> <span class="o">=</span> <span class="nb">table.remove</span> </span><span id="L-11"><a href="#L-11"><span class="linenos" data-line="11"></span></a><span class="kd">local</span> <span class="nb">setmetatable</span> <span class="o">=</span> <span class="nb">setmetatable</span> </span><span id="L-12"><a href="#L-12"><span class="linenos" data-line="12"></span></a><span class="kd">local</span> <span class="nb">type</span> <span class="o">=</span> <span class="nb">type</span> </span><span id="L-13"><a href="#L-13"><span class="linenos" data-line="13"></span></a><span class="kd">local</span> <span class="n">unpack</span> <span class="o">=</span> <span class="n">unpack</span> </span><span id="L-14"><a href="#L-14"><span class="linenos" data-line="14"></span></a> </span><span id="L-15"><a href="#L-15"><span class="linenos" data-line="15"></span></a><span class="kd">local</span> <span class="n">classes</span> <span class="o">=</span> <span class="p">{}</span> </span><span id="L-16"><a href="#L-16"><span class="linenos" data-line="16"></span></a><span class="kd">local</span> <span class="n">metamethods</span> <span class="o">=</span> <span class="n">mw</span><span class="p">.</span><span class="n">loadData</span><span class="p">(</span><span class="s2">&quot;Module:data/metamethods&quot;</span><span class="p">)</span> </span><span id="L-17"><a href="#L-17"><span class="linenos" data-line="17"></span></a> </span><span id="L-18"><a href="#L-18"><span class="linenos" data-line="18"></span></a><span class="c1">------------------------------------------------------------------------------------</span> </span><span id="L-19"><a href="#L-19"><span class="linenos" data-line="19"></span></a><span class="c1">--</span> </span><span id="L-20"><a href="#L-20"><span class="linenos" data-line="20"></span></a><span class="c1">-- Helper functions</span> </span><span id="L-21"><a href="#L-21"><span class="linenos" data-line="21"></span></a><span class="c1">--</span> </span><span id="L-22"><a href="#L-22"><span class="linenos" data-line="22"></span></a><span class="c1">------------------------------------------------------------------------------------</span> </span><span id="L-23"><a href="#L-23"><span class="linenos" data-line="23"></span></a> </span><span id="L-24"><a href="#L-24"><span class="linenos" data-line="24"></span></a><span class="kd">local</span> <span class="kr">function</span> <span class="nf">get_nested</span><span class="p">(</span><span class="n">t</span><span class="p">,</span> <span class="n">k</span><span class="p">,</span> <span class="p">...)</span> </span><span id="L-25"><a href="#L-25"><span class="linenos" data-line="25"></span></a> <span class="kr">if</span> <span class="n">t</span> <span class="o">==</span> <span class="kc">nil</span> <span class="kr">then</span> </span><span id="L-26"><a href="#L-26"><span class="linenos" data-line="26"></span></a> <span class="kr">return</span> <span class="kc">nil</span> </span><span id="L-27"><a href="#L-27"><span class="linenos" data-line="27"></span></a> <span class="kr">elseif</span> <span class="p">...</span> <span class="o">==</span> <span class="kc">nil</span> <span class="kr">then</span> </span><span id="L-28"><a href="#L-28"><span class="linenos" data-line="28"></span></a> <span class="kr">return</span> <span class="n">t</span><span class="p">[</span><span class="n">k</span><span class="p">]</span> </span><span id="L-29"><a href="#L-29"><span class="linenos" data-line="29"></span></a> <span class="kr">end</span> </span><span id="L-30"><a href="#L-30"><span class="linenos" data-line="30"></span></a> <span class="kr">return</span> <span class="n">get_nested</span><span class="p">(</span><span class="n">t</span><span class="p">[</span><span class="n">k</span><span class="p">],</span> <span class="p">...)</span> </span><span id="L-31"><a href="#L-31"><span class="linenos" data-line="31"></span></a><span class="kr">end</span> </span><span id="L-32"><a href="#L-32"><span class="linenos" data-line="32"></span></a> </span><span id="L-33"><a href="#L-33"><span class="linenos" data-line="33"></span></a><span class="kd">local</span> <span class="kr">function</span> <span class="nf">set_nested</span><span class="p">(</span><span class="n">t</span><span class="p">,</span> <span class="n">k</span><span class="p">,</span> <span class="n">v</span><span class="p">,</span> <span class="p">...)</span> </span><span id="L-34"><a href="#L-34"><span class="linenos" data-line="34"></span></a> <span class="kr">if</span> <span class="p">...</span> <span class="o">~=</span> <span class="kc">nil</span> <span class="kr">then</span> </span><span id="L-35"><a href="#L-35"><span class="linenos" data-line="35"></span></a> <span class="kd">local</span> <span class="n">t_next</span> <span class="o">=</span> <span class="n">t</span><span class="p">[</span><span class="n">k</span><span class="p">]</span> </span><span id="L-36"><a href="#L-36"><span class="linenos" data-line="36"></span></a> <span class="kr">if</span> <span class="n">t_next</span> <span class="o">==</span> <span class="kc">nil</span> <span class="kr">then</span> </span><span id="L-37"><a href="#L-37"><span class="linenos" data-line="37"></span></a> <span class="n">t_next</span> <span class="o">=</span> <span class="p">{}</span> </span><span id="L-38"><a href="#L-38"><span class="linenos" data-line="38"></span></a> <span class="n">t</span><span class="p">[</span><span class="n">k</span><span class="p">]</span> <span class="o">=</span> <span class="n">t_next</span> </span><span id="L-39"><a href="#L-39"><span class="linenos" data-line="39"></span></a> <span class="kr">end</span> </span><span id="L-40"><a href="#L-40"><span class="linenos" data-line="40"></span></a> <span class="kr">return</span> <span class="n">set_nested</span><span class="p">(</span><span class="n">t_next</span><span class="p">,</span> <span class="n">v</span><span class="p">,</span> <span class="p">...)</span> </span><span id="L-41"><a href="#L-41"><span class="linenos" data-line="41"></span></a> <span class="kr">end</span> </span><span id="L-42"><a href="#L-42"><span class="linenos" data-line="42"></span></a> <span class="n">t</span><span class="p">[</span><span class="n">k</span><span class="p">]</span> <span class="o">=</span> <span class="n">v</span> </span><span id="L-43"><a href="#L-43"><span class="linenos" data-line="43"></span></a><span class="kr">end</span> </span><span id="L-44"><a href="#L-44"><span class="linenos" data-line="44"></span></a> </span><span id="L-45"><a href="#L-45"><span class="linenos" data-line="45"></span></a><span class="kd">local</span> <span class="kr">function</span> <span class="nf">inherit_metamethods</span><span class="p">(</span><span class="n">child</span><span class="p">,</span> <span class="n">parent</span><span class="p">)</span> </span><span id="L-46"><a href="#L-46"><span class="linenos" data-line="46"></span></a> <span class="kr">if</span> <span class="n">parent</span> <span class="kr">then</span> </span><span id="L-47"><a href="#L-47"><span class="linenos" data-line="47"></span></a> <span class="kr">for</span> <span class="n">method</span><span class="p">,</span> <span class="n">value</span> <span class="kr">in</span> <span class="nb">next</span><span class="p">,</span> <span class="n">parent</span> <span class="kr">do</span> </span><span id="L-48"><a href="#L-48"><span class="linenos" data-line="48"></span></a> <span class="kr">if</span> <span class="n">child</span><span class="p">[</span><span class="n">method</span><span class="p">]</span> <span class="o">==</span> <span class="kc">nil</span> <span class="ow">and</span> <span class="n">metamethods</span><span class="p">[</span><span class="n">method</span><span class="p">]</span> <span class="o">~=</span> <span class="kc">nil</span> <span class="kr">then</span> </span><span id="L-49"><a href="#L-49"><span class="linenos" data-line="49"></span></a> <span class="n">child</span><span class="p">[</span><span class="n">method</span><span class="p">]</span> <span class="o">=</span> <span class="n">value</span> </span><span id="L-50"><a href="#L-50"><span class="linenos" data-line="50"></span></a> <span class="kr">end</span> </span><span id="L-51"><a href="#L-51"><span class="linenos" data-line="51"></span></a> <span class="kr">end</span> </span><span id="L-52"><a href="#L-52"><span class="linenos" data-line="52"></span></a> <span class="kr">end</span> </span><span id="L-53"><a href="#L-53"><span class="linenos" data-line="53"></span></a> <span class="kr">return</span> <span class="n">child</span> </span><span id="L-54"><a href="#L-54"><span class="linenos" data-line="54"></span></a><span class="kr">end</span> </span><span id="L-55"><a href="#L-55"><span class="linenos" data-line="55"></span></a> </span><span id="L-56"><a href="#L-56"><span class="linenos" data-line="56"></span></a><span class="kd">local</span> <span class="kr">function</span> <span class="nf">signed_index</span><span class="p">(</span><span class="n">t</span><span class="p">,</span> <span class="n">n</span><span class="p">)</span> </span><span id="L-57"><a href="#L-57"><span class="linenos" data-line="57"></span></a> <span class="kr">return</span> <span class="n">n</span> <span class="ow">and</span> <span class="n">n</span> <span class="o">&lt;=</span> <span class="mi">0</span> <span class="ow">and</span> <span class="o">#</span><span class="n">t</span> <span class="o">+</span> <span class="mi">1</span> <span class="o">+</span> <span class="n">n</span> <span class="ow">or</span> <span class="n">n</span> </span><span id="L-58"><a href="#L-58"><span class="linenos" data-line="58"></span></a><span class="kr">end</span> </span><span id="L-59"><a href="#L-59"><span class="linenos" data-line="59"></span></a> </span><span id="L-60"><a href="#L-60"><span class="linenos" data-line="60"></span></a><span class="kd">local</span> <span class="kr">function</span> <span class="nf">is_node</span><span class="p">(</span><span class="n">value</span><span class="p">)</span> </span><span id="L-61"><a href="#L-61"><span class="linenos" data-line="61"></span></a> <span class="kr">return</span> <span class="n">classes</span><span class="p">[</span><span class="nb">getmetatable</span><span class="p">(</span><span class="n">value</span><span class="p">)]</span> <span class="o">~=</span> <span class="kc">nil</span> </span><span id="L-62"><a href="#L-62"><span class="linenos" data-line="62"></span></a><span class="kr">end</span> </span><span id="L-63"><a href="#L-63"><span class="linenos" data-line="63"></span></a> </span><span id="L-64"><a href="#L-64"><span class="linenos" data-line="64"></span></a><span class="c1">-- Recursively calling tostring() adds to the C stack (limit: 200), whereas</span> </span><span id="L-65"><a href="#L-65"><span class="linenos" data-line="65"></span></a><span class="c1">-- calling __tostring metamethods directly does not. Occasionally relevant when</span> </span><span id="L-66"><a href="#L-66"><span class="linenos" data-line="66"></span></a><span class="c1">-- dealing with very deep nesting.</span> </span><span id="L-67"><a href="#L-67"><span class="linenos" data-line="67"></span></a><span class="kd">local</span> <span class="nb">tostring</span> </span><span id="L-68"><a href="#L-68"><span class="linenos" data-line="68"></span></a><span class="kr">do</span> </span><span id="L-69"><a href="#L-69"><span class="linenos" data-line="69"></span></a> <span class="kd">local</span> <span class="n">_tostring</span> <span class="o">=</span> <span class="n">_G</span><span class="p">.</span><span class="n">tostring</span> </span><span id="L-70"><a href="#L-70"><span class="linenos" data-line="70"></span></a> </span><span id="L-71"><a href="#L-71"><span class="linenos" data-line="71"></span></a> <span class="kr">function</span> <span class="nf">tostring</span><span class="p">(</span><span class="n">value</span><span class="p">)</span> </span><span id="L-72"><a href="#L-72"><span class="linenos" data-line="72"></span></a> <span class="kr">if</span> <span class="n">is_node</span><span class="p">(</span><span class="n">value</span><span class="p">)</span> <span class="kr">then</span> </span><span id="L-73"><a href="#L-73"><span class="linenos" data-line="73"></span></a> <span class="kr">return</span> <span class="n">value</span><span class="p">:</span><span class="n">__tostring</span><span class="p">(</span><span class="n">value</span><span class="p">)</span> </span><span id="L-74"><a href="#L-74"><span class="linenos" data-line="74"></span></a> <span class="kr">end</span> </span><span id="L-75"><a href="#L-75"><span class="linenos" data-line="75"></span></a> <span class="kr">return</span> <span class="n">_tostring</span><span class="p">(</span><span class="n">value</span><span class="p">)</span> </span><span id="L-76"><a href="#L-76"><span class="linenos" data-line="76"></span></a> <span class="kr">end</span> </span><span id="L-77"><a href="#L-77"><span class="linenos" data-line="77"></span></a><span class="kr">end</span> </span><span id="L-78"><a href="#L-78"><span class="linenos" data-line="78"></span></a> </span><span id="L-79"><a href="#L-79"><span class="linenos" data-line="79"></span></a><span class="kd">local</span> <span class="kr">function</span> <span class="nf">class_else_type</span><span class="p">(</span><span class="n">value</span><span class="p">)</span> </span><span id="L-80"><a href="#L-80"><span class="linenos" data-line="80"></span></a> <span class="kd">local</span> <span class="n">class</span> <span class="o">=</span> <span class="n">classes</span><span class="p">[</span><span class="nb">getmetatable</span><span class="p">(</span><span class="n">value</span><span class="p">)]</span> </span><span id="L-81"><a href="#L-81"><span class="linenos" data-line="81"></span></a> <span class="kr">if</span> <span class="n">class</span> <span class="o">~=</span> <span class="kc">nil</span> <span class="kr">then</span> </span><span id="L-82"><a href="#L-82"><span class="linenos" data-line="82"></span></a> <span class="kr">return</span> <span class="n">class</span> </span><span id="L-83"><a href="#L-83"><span class="linenos" data-line="83"></span></a> <span class="kr">end</span> </span><span id="L-84"><a href="#L-84"><span class="linenos" data-line="84"></span></a> <span class="kr">return</span> <span class="nb">type</span><span class="p">(</span><span class="n">value</span><span class="p">)</span> </span><span id="L-85"><a href="#L-85"><span class="linenos" data-line="85"></span></a><span class="kr">end</span> </span><span id="L-86"><a href="#L-86"><span class="linenos" data-line="86"></span></a> </span><span id="L-87"><a href="#L-87"><span class="linenos" data-line="87"></span></a><span class="c1">------------------------------------------------------------------------------------</span> </span><span id="L-88"><a href="#L-88"><span class="linenos" data-line="88"></span></a><span class="c1">--</span> </span><span id="L-89"><a href="#L-89"><span class="linenos" data-line="89"></span></a><span class="c1">-- Nodes</span> </span><span id="L-90"><a href="#L-90"><span class="linenos" data-line="90"></span></a><span class="c1">--</span> </span><span id="L-91"><a href="#L-91"><span class="linenos" data-line="91"></span></a><span class="c1">------------------------------------------------------------------------------------</span> </span><span id="L-92"><a href="#L-92"><span class="linenos" data-line="92"></span></a> </span><span id="L-93"><a href="#L-93"><span class="linenos" data-line="93"></span></a><span class="kd">local</span> <span class="n">Node</span> <span class="o">=</span> <span class="p">{}</span> </span><span id="L-94"><a href="#L-94"><span class="linenos" data-line="94"></span></a><span class="n">Node</span><span class="p">.</span><span class="n">__index</span> <span class="o">=</span> <span class="n">Node</span> </span><span id="L-95"><a href="#L-95"><span class="linenos" data-line="95"></span></a> </span><span id="L-96"><a href="#L-96"><span class="linenos" data-line="96"></span></a><span class="kr">function</span> <span class="nc">Node</span><span class="p">:</span><span class="nf">next</span><span class="p">(</span><span class="n">i</span><span class="p">)</span> </span><span id="L-97"><a href="#L-97"><span class="linenos" data-line="97"></span></a> <span class="n">i</span> <span class="o">=</span> <span class="n">i</span> <span class="o">+</span> <span class="mi">1</span> </span><span id="L-98"><a href="#L-98"><span class="linenos" data-line="98"></span></a> <span class="kr">return</span> <span class="n">self</span><span class="p">[</span><span class="n">i</span><span class="p">],</span> <span class="n">self</span><span class="p">,</span> <span class="n">i</span> </span><span id="L-99"><a href="#L-99"><span class="linenos" data-line="99"></span></a><span class="kr">end</span> </span><span id="L-100"><a href="#L-100"><span class="linenos" data-line="100"></span></a> </span><span id="L-101"><a href="#L-101"><span class="linenos" data-line="101"></span></a><span class="kr">function</span> <span class="nc">Node</span><span class="p">:</span><span class="nf">next_node</span><span class="p">(</span><span class="n">i</span><span class="p">)</span> </span><span id="L-102"><a href="#L-102"><span class="linenos" data-line="102"></span></a> <span class="kd">local</span> <span class="n">v</span> </span><span id="L-103"><a href="#L-103"><span class="linenos" data-line="103"></span></a> <span class="kr">repeat</span> </span><span id="L-104"><a href="#L-104"><span class="linenos" data-line="104"></span></a> <span class="n">v</span><span class="p">,</span> <span class="n">self</span><span class="p">,</span> <span class="n">i</span> <span class="o">=</span> <span class="n">self</span><span class="p">:</span><span class="nb">next</span><span class="p">(</span><span class="n">i</span><span class="p">)</span> </span><span id="L-105"><a href="#L-105"><span class="linenos" data-line="105"></span></a> <span class="kr">until</span> <span class="n">v</span> <span class="o">==</span> <span class="kc">nil</span> <span class="ow">or</span> <span class="n">is_node</span><span class="p">(</span><span class="n">v</span><span class="p">)</span> </span><span id="L-106"><a href="#L-106"><span class="linenos" data-line="106"></span></a> <span class="kr">return</span> <span class="n">v</span><span class="p">,</span> <span class="n">self</span><span class="p">,</span> <span class="n">i</span> </span><span id="L-107"><a href="#L-107"><span class="linenos" data-line="107"></span></a><span class="kr">end</span> </span><span id="L-108"><a href="#L-108"><span class="linenos" data-line="108"></span></a> </span><span id="L-109"><a href="#L-109"><span class="linenos" data-line="109"></span></a><span class="c1">-- Implements recursive iteration over a node tree, using functors to maintain state (which uses a lot less memory than closures). Iterator1 exists only to return the calling node on the first iteration, while Iterator2 uses a stack to store the state of each layer in the tree.</span> </span><span id="L-110"><a href="#L-110"><span class="linenos" data-line="110"></span></a> </span><span id="L-111"><a href="#L-111"><span class="linenos" data-line="111"></span></a><span class="c1">-- 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 followed if any of those children contain nodes themselves. Once a particular node has been fully traversed, the iterator moves back up one layer and continues with any sibling nodes.</span> </span><span id="L-112"><a href="#L-112"><span class="linenos" data-line="112"></span></a> </span><span id="L-113"><a href="#L-113"><span class="linenos" data-line="113"></span></a><span class="c1">-- 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.</span> </span><span id="L-114"><a href="#L-114"><span class="linenos" data-line="114"></span></a> </span><span id="L-115"><a href="#L-115"><span class="linenos" data-line="115"></span></a><span class="c1">-- By default, the iterator will use the `next` method of each node, but this can be changed with the `next_func` parameter, which accepts a string argument with the name of a next method. This is because trees might consist of several different classes of node, and each might have different next methods that are tailored to their particular structures. In addition, each class of node might have multiple different next methods, which can be named according to their purposes. `next_func` ensures that the iterator uses equivalent next methods between different types of node.</span> </span><span id="L-116"><a href="#L-116"><span class="linenos" data-line="116"></span></a> </span><span id="L-117"><a href="#L-117"><span class="linenos" data-line="117"></span></a><span class="c1">-- Currently, two next methods are available: `next`, which simply iterates over the node conventionally, and `next_node`, which only returns children that are themselves nodes. Custom next methods can be declared by any calling module.</span> </span><span id="L-118"><a href="#L-118"><span class="linenos" data-line="118"></span></a><span class="kr">do</span> </span><span id="L-119"><a href="#L-119"><span class="linenos" data-line="119"></span></a> <span class="kd">local</span> <span class="n">Iterator1</span><span class="p">,</span> <span class="n">Iterator2</span> <span class="o">=</span> <span class="p">{},</span> <span class="p">{}</span> </span><span id="L-120"><a href="#L-120"><span class="linenos" data-line="120"></span></a> <span class="n">Iterator2</span><span class="p">.</span><span class="n">__index</span> <span class="o">=</span> <span class="n">Iterator2</span> </span><span id="L-121"><a href="#L-121"><span class="linenos" data-line="121"></span></a> </span><span id="L-122"><a href="#L-122"><span class="linenos" data-line="122"></span></a> <span class="c1">-- Only called on the first iteration, to return the calling node.</span> </span><span id="L-123"><a href="#L-123"><span class="linenos" data-line="123"></span></a> <span class="kr">function</span> <span class="nc">Iterator1</span><span class="p">:</span><span class="nf">__call</span><span class="p">()</span> </span><span id="L-124"><a href="#L-124"><span class="linenos" data-line="124"></span></a> <span class="nb">setmetatable</span><span class="p">(</span><span class="n">self</span><span class="p">,</span> <span class="n">Iterator2</span><span class="p">)</span> </span><span id="L-125"><a href="#L-125"><span class="linenos" data-line="125"></span></a> <span class="kr">return</span> <span class="n">self</span><span class="p">[</span><span class="mi">1</span><span class="p">].</span><span class="n">node</span> </span><span id="L-126"><a href="#L-126"><span class="linenos" data-line="126"></span></a> <span class="kr">end</span> </span><span id="L-127"><a href="#L-127"><span class="linenos" data-line="127"></span></a> </span><span id="L-128"><a href="#L-128"><span class="linenos" data-line="128"></span></a> <span class="c1">-- Catches an arbitrary number of returned values, which avoids the need to do it with a new table each time.</span> </span><span id="L-129"><a href="#L-129"><span class="linenos" data-line="129"></span></a> <span class="kr">function</span> <span class="nc">Iterator2</span><span class="p">:</span><span class="nf">catch_values</span><span class="p">(</span><span class="n">layer</span><span class="p">,</span> <span class="p">...)</span> </span><span id="L-130"><a href="#L-130"><span class="linenos" data-line="130"></span></a> <span class="kd">local</span> <span class="n">v</span><span class="p">,</span> <span class="n">node</span><span class="p">,</span> <span class="n">k</span> <span class="o">=</span> <span class="p">...</span> </span><span id="L-131"><a href="#L-131"><span class="linenos" data-line="131"></span></a> <span class="kr">if</span> <span class="n">v</span> <span class="o">~=</span> <span class="kc">nil</span> <span class="kr">then</span> </span><span id="L-132"><a href="#L-132"><span class="linenos" data-line="132"></span></a> <span class="n">layer</span><span class="p">.</span><span class="n">k</span> <span class="o">=</span> <span class="n">k</span> </span><span id="L-133"><a href="#L-133"><span class="linenos" data-line="133"></span></a> <span class="kr">return</span> <span class="p">...</span> </span><span id="L-134"><a href="#L-134"><span class="linenos" data-line="134"></span></a> <span class="kr">end</span> </span><span id="L-135"><a href="#L-135"><span class="linenos" data-line="135"></span></a> <span class="c1">-- If `v` is nil, pop the stack, and continue iterating over the layer below if there is one; otherwise, terminate.</span> </span><span id="L-136"><a href="#L-136"><span class="linenos" data-line="136"></span></a> <span class="kd">local</span> <span class="n">self_len</span> <span class="o">=</span> <span class="o">#</span><span class="n">self</span> </span><span id="L-137"><a href="#L-137"><span class="linenos" data-line="137"></span></a> <span class="n">layer</span> <span class="o">=</span> <span class="n">self</span><span class="p">[</span><span class="n">self_len</span> <span class="o">-</span> <span class="mi">1</span><span class="p">]</span> </span><span id="L-138"><a href="#L-138"><span class="linenos" data-line="138"></span></a> <span class="kr">if</span> <span class="n">layer</span> <span class="o">~=</span> <span class="kc">nil</span> <span class="kr">then</span> </span><span id="L-139"><a href="#L-139"><span class="linenos" data-line="139"></span></a> <span class="n">self</span><span class="p">[</span><span class="n">self_len</span><span class="p">],</span> <span class="n">self</span><span class="p">[</span><span class="o">-</span><span class="mi">1</span><span class="p">],</span> <span class="n">node</span> <span class="o">=</span> <span class="kc">nil</span><span class="p">,</span> <span class="n">layer</span><span class="p">,</span> <span class="n">layer</span><span class="p">.</span><span class="n">node</span> </span><span id="L-140"><a href="#L-140"><span class="linenos" data-line="140"></span></a> <span class="kr">return</span> <span class="n">self</span><span class="p">:</span><span class="n">catch_values</span><span class="p">(</span><span class="n">layer</span><span class="p">,</span> <span class="n">node</span><span class="p">[</span><span class="n">self</span><span class="p">.</span><span class="n">next_func</span><span class="p">](</span><span class="n">node</span><span class="p">,</span> <span class="n">layer</span><span class="p">.</span><span class="n">k</span><span class="p">))</span> </span><span id="L-141"><a href="#L-141"><span class="linenos" data-line="141"></span></a> <span class="kr">end</span> </span><span id="L-142"><a href="#L-142"><span class="linenos" data-line="142"></span></a> <span class="kr">end</span> </span><span id="L-143"><a href="#L-143"><span class="linenos" data-line="143"></span></a> </span><span id="L-144"><a href="#L-144"><span class="linenos" data-line="144"></span></a> <span class="kr">function</span> <span class="nc">Iterator2</span><span class="p">:</span><span class="nf">__call</span><span class="p">()</span> </span><span id="L-145"><a href="#L-145"><span class="linenos" data-line="145"></span></a> <span class="kd">local</span> <span class="n">layer</span> <span class="o">=</span> <span class="n">self</span><span class="p">[</span><span class="o">-</span><span class="mi">1</span><span class="p">]</span> </span><span id="L-146"><a href="#L-146"><span class="linenos" data-line="146"></span></a> <span class="kd">local</span> <span class="n">node</span><span class="p">,</span> <span class="n">k</span> <span class="o">=</span> <span class="n">layer</span><span class="p">.</span><span class="n">node</span><span class="p">,</span> <span class="n">layer</span><span class="p">.</span><span class="n">k</span> </span><span id="L-147"><a href="#L-147"><span class="linenos" data-line="147"></span></a> <span class="kd">local</span> <span class="n">v</span> <span class="o">=</span> <span class="n">node</span><span class="p">[</span><span class="n">k</span><span class="p">]</span> </span><span id="L-148"><a href="#L-148"><span class="linenos" data-line="148"></span></a> <span class="c1">-- If `v` is a node, push a new layer onto the stack and iterate over it.</span> </span><span id="L-149"><a href="#L-149"><span class="linenos" data-line="149"></span></a> <span class="kr">if</span> <span class="n">is_node</span><span class="p">(</span><span class="n">v</span><span class="p">)</span> <span class="kr">then</span> </span><span id="L-150"><a href="#L-150"><span class="linenos" data-line="150"></span></a> <span class="n">layer</span><span class="p">,</span> <span class="n">k</span><span class="p">,</span> <span class="n">node</span> <span class="o">=</span> <span class="p">{</span><span class="n">k</span> <span class="o">=</span> <span class="mi">0</span><span class="p">,</span> <span class="n">node</span> <span class="o">=</span> <span class="n">v</span><span class="p">},</span> <span class="mi">0</span><span class="p">,</span> <span class="n">v</span> </span><span id="L-151"><a href="#L-151"><span class="linenos" data-line="151"></span></a> <span class="n">self</span><span class="p">[</span><span class="o">#</span><span class="n">self</span> <span class="o">+</span> <span class="mi">1</span><span class="p">],</span> <span class="n">self</span><span class="p">[</span><span class="o">-</span><span class="mi">1</span><span class="p">]</span> <span class="o">=</span> <span class="n">layer</span><span class="p">,</span> <span class="n">layer</span> </span><span id="L-152"><a href="#L-152"><span class="linenos" data-line="152"></span></a> <span class="kr">end</span> </span><span id="L-153"><a href="#L-153"><span class="linenos" data-line="153"></span></a> <span class="kr">return</span> <span class="n">self</span><span class="p">:</span><span class="n">catch_values</span><span class="p">(</span><span class="n">layer</span><span class="p">,</span> <span class="n">node</span><span class="p">[</span><span class="n">self</span><span class="p">.</span><span class="n">next_func</span><span class="p">](</span><span class="n">node</span><span class="p">,</span> <span class="n">k</span><span class="p">))</span> </span><span id="L-154"><a href="#L-154"><span class="linenos" data-line="154"></span></a> <span class="kr">end</span> </span><span id="L-155"><a href="#L-155"><span class="linenos" data-line="155"></span></a> </span><span id="L-156"><a href="#L-156"><span class="linenos" data-line="156"></span></a> <span class="kr">function</span> <span class="nc">Node</span><span class="p">:</span><span class="nf">iterate</span><span class="p">(</span><span class="n">next_func</span><span class="p">)</span> </span><span id="L-157"><a href="#L-157"><span class="linenos" data-line="157"></span></a> <span class="kd">local</span> <span class="n">layer</span> <span class="o">=</span> <span class="p">{</span><span class="n">k</span> <span class="o">=</span> <span class="mi">0</span><span class="p">,</span> <span class="n">node</span> <span class="o">=</span> <span class="n">self</span><span class="p">}</span> </span><span id="L-158"><a href="#L-158"><span class="linenos" data-line="158"></span></a> <span class="kr">return</span> <span class="nb">setmetatable</span><span class="p">({</span> </span><span id="L-159"><a href="#L-159"><span class="linenos" data-line="159"></span></a> <span class="n">layer</span><span class="p">,</span> </span><span id="L-160"><a href="#L-160"><span class="linenos" data-line="160"></span></a> <span class="p">[</span><span class="o">-</span><span class="mi">1</span><span class="p">]</span> <span class="o">=</span> <span class="n">layer</span><span class="p">,</span> </span><span id="L-161"><a href="#L-161"><span class="linenos" data-line="161"></span></a> <span class="n">next_func</span> <span class="o">=</span> <span class="n">next_func</span> <span class="o">==</span> <span class="kc">nil</span> <span class="ow">and</span> <span class="s2">&quot;next&quot;</span> <span class="ow">or</span> <span class="n">next_func</span><span class="p">,</span> </span><span id="L-162"><a href="#L-162"><span class="linenos" data-line="162"></span></a> <span class="p">},</span> <span class="n">Iterator1</span><span class="p">)</span> </span><span id="L-163"><a href="#L-163"><span class="linenos" data-line="163"></span></a> <span class="kr">end</span> </span><span id="L-164"><a href="#L-164"><span class="linenos" data-line="164"></span></a><span class="kr">end</span> </span><span id="L-165"><a href="#L-165"><span class="linenos" data-line="165"></span></a> </span><span id="L-166"><a href="#L-166"><span class="linenos" data-line="166"></span></a><span class="kr">function</span> <span class="nc">Node</span><span class="p">:</span><span class="nf">iterate_nodes</span><span class="p">()</span> </span><span id="L-167"><a href="#L-167"><span class="linenos" data-line="167"></span></a> <span class="kr">return</span> <span class="n">self</span><span class="p">:</span><span class="n">iterate</span><span class="p">(</span><span class="s2">&quot;next_node&quot;</span><span class="p">)</span> </span><span id="L-168"><a href="#L-168"><span class="linenos" data-line="168"></span></a><span class="kr">end</span> </span><span id="L-169"><a href="#L-169"><span class="linenos" data-line="169"></span></a> </span><span id="L-170"><a href="#L-170"><span class="linenos" data-line="170"></span></a><span class="kr">function</span> <span class="nc">Node</span><span class="p">:</span><span class="nf">__tostring</span><span class="p">()</span> </span><span id="L-171"><a href="#L-171"><span class="linenos" data-line="171"></span></a> <span class="kd">local</span> <span class="n">output</span> <span class="o">=</span> <span class="p">{}</span> </span><span id="L-172"><a href="#L-172"><span class="linenos" data-line="172"></span></a> <span class="kr">for</span> <span class="n">i</span> <span class="o">=</span> <span class="mi">1</span><span class="p">,</span> <span class="o">#</span><span class="n">self</span> <span class="kr">do</span> </span><span id="L-173"><a href="#L-173"><span class="linenos" data-line="173"></span></a> <span class="n">insert</span><span class="p">(</span><span class="n">output</span><span class="p">,</span> <span class="nb">tostring</span><span class="p">(</span><span class="n">self</span><span class="p">[</span><span class="n">i</span><span class="p">]))</span> </span><span id="L-174"><a href="#L-174"><span class="linenos" data-line="174"></span></a> <span class="kr">end</span> </span><span id="L-175"><a href="#L-175"><span class="linenos" data-line="175"></span></a> <span class="kr">return</span> <span class="n">concat</span><span class="p">(</span><span class="n">output</span><span class="p">)</span> </span><span id="L-176"><a href="#L-176"><span class="linenos" data-line="176"></span></a><span class="kr">end</span> </span><span id="L-177"><a href="#L-177"><span class="linenos" data-line="177"></span></a> </span><span id="L-178"><a href="#L-178"><span class="linenos" data-line="178"></span></a><span class="kr">function</span> <span class="nc">Node</span><span class="p">:</span><span class="nf">clone</span><span class="p">()</span> </span><span id="L-179"><a href="#L-179"><span class="linenos" data-line="179"></span></a> <span class="kr">if</span> <span class="ow">not</span> <span class="n">deepcopy</span> <span class="kr">then</span> </span><span id="L-180"><a href="#L-180"><span class="linenos" data-line="180"></span></a> <span class="n">deepcopy</span> <span class="o">=</span> <span class="nb">require</span><span class="p">(</span><span class="s2">&quot;Module:table&quot;</span><span class="p">).</span><span class="n">deepcopy</span> </span><span id="L-181"><a href="#L-181"><span class="linenos" data-line="181"></span></a> <span class="kr">end</span> </span><span id="L-182"><a href="#L-182"><span class="linenos" data-line="182"></span></a> <span class="kr">return</span> <span class="n">deepcopy</span><span class="p">(</span><span class="n">self</span><span class="p">,</span> <span class="s2">&quot;keep&quot;</span><span class="p">,</span> <span class="kc">true</span><span class="p">)</span> </span><span id="L-183"><a href="#L-183"><span class="linenos" data-line="183"></span></a><span class="kr">end</span> </span><span id="L-184"><a href="#L-184"><span class="linenos" data-line="184"></span></a> </span><span id="L-185"><a href="#L-185"><span class="linenos" data-line="185"></span></a><span class="kr">function</span> <span class="nc">Node</span><span class="p">:</span><span class="nf">new_class</span><span class="p">(</span><span class="n">class</span><span class="p">)</span> </span><span id="L-186"><a href="#L-186"><span class="linenos" data-line="186"></span></a> <span class="kd">local</span> <span class="n">t</span> <span class="o">=</span> <span class="p">{</span><span class="nb">type</span> <span class="o">=</span> <span class="n">class</span><span class="p">}</span> </span><span id="L-187"><a href="#L-187"><span class="linenos" data-line="187"></span></a> <span class="n">t</span><span class="p">.</span><span class="n">__index</span> <span class="o">=</span> <span class="n">t</span> </span><span id="L-188"><a href="#L-188"><span class="linenos" data-line="188"></span></a> <span class="n">t</span> <span class="o">=</span> <span class="n">inherit_metamethods</span><span class="p">(</span><span class="n">t</span><span class="p">,</span> <span class="n">self</span><span class="p">)</span> </span><span id="L-189"><a href="#L-189"><span class="linenos" data-line="189"></span></a> <span class="n">classes</span><span class="p">[</span><span class="n">t</span><span class="p">]</span> <span class="o">=</span> <span class="n">class</span> </span><span id="L-190"><a href="#L-190"><span class="linenos" data-line="190"></span></a> <span class="kr">return</span> <span class="nb">setmetatable</span><span class="p">(</span><span class="n">t</span><span class="p">,</span> <span class="n">self</span><span class="p">)</span> </span><span id="L-191"><a href="#L-191"><span class="linenos" data-line="191"></span></a><span class="kr">end</span> </span><span id="L-192"><a href="#L-192"><span class="linenos" data-line="192"></span></a> </span><span id="L-193"><a href="#L-193"><span class="linenos" data-line="193"></span></a><span class="n">Node</span><span class="p">.</span><span class="n">keys_to_remove</span> <span class="o">=</span> <span class="p">{</span><span class="s2">&quot;fail&quot;</span><span class="p">,</span> <span class="s2">&quot;handler&quot;</span><span class="p">,</span> <span class="s2">&quot;head&quot;</span><span class="p">,</span> <span class="s2">&quot;override&quot;</span><span class="p">,</span> <span class="s2">&quot;route&quot;</span><span class="p">}</span> </span><span id="L-194"><a href="#L-194"><span class="linenos" data-line="194"></span></a> </span><span id="L-195"><a href="#L-195"><span class="linenos" data-line="195"></span></a><span class="kr">function</span> <span class="nc">Node</span><span class="p">:</span><span class="nf">new</span><span class="p">(</span><span class="n">t</span><span class="p">)</span> </span><span id="L-196"><a href="#L-196"><span class="linenos" data-line="196"></span></a> <span class="nb">setmetatable</span><span class="p">(</span><span class="n">t</span><span class="p">,</span> <span class="kc">nil</span><span class="p">)</span> </span><span id="L-197"><a href="#L-197"><span class="linenos" data-line="197"></span></a> <span class="kd">local</span> <span class="n">keys_to_remove</span> <span class="o">=</span> <span class="n">self</span><span class="p">.</span><span class="n">keys_to_remove</span> </span><span id="L-198"><a href="#L-198"><span class="linenos" data-line="198"></span></a> <span class="kr">for</span> <span class="n">i</span> <span class="o">=</span> <span class="mi">1</span><span class="p">,</span> <span class="o">#</span><span class="n">keys_to_remove</span> <span class="kr">do</span> </span><span id="L-199"><a href="#L-199"><span class="linenos" data-line="199"></span></a> <span class="n">t</span><span class="p">[</span><span class="n">keys_to_remove</span><span class="p">[</span><span class="n">i</span><span class="p">]]</span> <span class="o">=</span> <span class="kc">nil</span> </span><span id="L-200"><a href="#L-200"><span class="linenos" data-line="200"></span></a> <span class="kr">end</span> </span><span id="L-201"><a href="#L-201"><span class="linenos" data-line="201"></span></a> <span class="kr">return</span> <span class="nb">setmetatable</span><span class="p">(</span><span class="n">t</span><span class="p">,</span> <span class="n">self</span><span class="p">)</span> </span><span id="L-202"><a href="#L-202"><span class="linenos" data-line="202"></span></a><span class="kr">end</span> </span><span id="L-203"><a href="#L-203"><span class="linenos" data-line="203"></span></a> </span><span id="L-204"><a href="#L-204"><span class="linenos" data-line="204"></span></a><span class="kr">do</span> </span><span id="L-205"><a href="#L-205"><span class="linenos" data-line="205"></span></a> <span class="kd">local</span> <span class="n">Proxy</span> <span class="o">=</span> <span class="p">{}</span> </span><span id="L-206"><a href="#L-206"><span class="linenos" data-line="206"></span></a> </span><span id="L-207"><a href="#L-207"><span class="linenos" data-line="207"></span></a> <span class="kr">function</span> <span class="nc">Proxy</span><span class="p">:</span><span class="nf">__index</span><span class="p">(</span><span class="n">k</span><span class="p">)</span> </span><span id="L-208"><a href="#L-208"><span class="linenos" data-line="208"></span></a> <span class="kd">local</span> <span class="n">v</span> <span class="o">=</span> <span class="n">Proxy</span><span class="p">[</span><span class="n">k</span><span class="p">]</span> </span><span id="L-209"><a href="#L-209"><span class="linenos" data-line="209"></span></a> <span class="kr">if</span> <span class="n">v</span> <span class="o">~=</span> <span class="kc">nil</span> <span class="kr">then</span> </span><span id="L-210"><a href="#L-210"><span class="linenos" data-line="210"></span></a> <span class="kr">return</span> <span class="n">v</span> </span><span id="L-211"><a href="#L-211"><span class="linenos" data-line="211"></span></a> <span class="kr">end</span> </span><span id="L-212"><a href="#L-212"><span class="linenos" data-line="212"></span></a> <span class="kr">return</span> <span class="n">self</span><span class="p">.</span><span class="n">__chars</span><span class="p">[</span><span class="n">k</span><span class="p">]</span> </span><span id="L-213"><a href="#L-213"><span class="linenos" data-line="213"></span></a> <span class="kr">end</span> </span><span id="L-214"><a href="#L-214"><span class="linenos" data-line="214"></span></a> </span><span id="L-215"><a href="#L-215"><span class="linenos" data-line="215"></span></a> <span class="kr">function</span> <span class="nc">Proxy</span><span class="p">:</span><span class="nf">__newindex</span><span class="p">(</span><span class="n">k</span><span class="p">,</span> <span class="n">v</span><span class="p">)</span> </span><span id="L-216"><a href="#L-216"><span class="linenos" data-line="216"></span></a> <span class="kd">local</span> <span class="n">key</span> <span class="o">=</span> <span class="n">self</span><span class="p">.</span><span class="n">__keys</span><span class="p">[</span><span class="n">k</span><span class="p">]</span> </span><span id="L-217"><a href="#L-217"><span class="linenos" data-line="217"></span></a> <span class="kr">if</span> <span class="n">key</span> <span class="kr">then</span> </span><span id="L-218"><a href="#L-218"><span class="linenos" data-line="218"></span></a> <span class="n">self</span><span class="p">.</span><span class="n">__chars</span><span class="p">[</span><span class="n">k</span><span class="p">]</span> <span class="o">=</span> <span class="n">v</span> </span><span id="L-219"><a href="#L-219"><span class="linenos" data-line="219"></span></a> <span class="n">self</span><span class="p">.</span><span class="n">__parents</span><span class="p">[</span><span class="n">key</span><span class="p">]</span> <span class="o">=</span> <span class="n">v</span> </span><span id="L-220"><a href="#L-220"><span class="linenos" data-line="220"></span></a> <span class="kr">elseif</span> <span class="n">key</span> <span class="o">==</span> <span class="kc">false</span> <span class="kr">then</span> </span><span id="L-221"><a href="#L-221"><span class="linenos" data-line="221"></span></a> <span class="nb">error</span><span class="p">(</span><span class="s2">&quot;Character is immutable.&quot;</span><span class="p">)</span> </span><span id="L-222"><a href="#L-222"><span class="linenos" data-line="222"></span></a> <span class="kr">else</span> </span><span id="L-223"><a href="#L-223"><span class="linenos" data-line="223"></span></a> <span class="nb">error</span><span class="p">(</span><span class="s2">&quot;Invalid key.&quot;</span><span class="p">)</span> </span><span id="L-224"><a href="#L-224"><span class="linenos" data-line="224"></span></a> <span class="kr">end</span> </span><span id="L-225"><a href="#L-225"><span class="linenos" data-line="225"></span></a> <span class="kr">end</span> </span><span id="L-226"><a href="#L-226"><span class="linenos" data-line="226"></span></a> </span><span id="L-227"><a href="#L-227"><span class="linenos" data-line="227"></span></a> <span class="kr">function</span> <span class="nc">Proxy</span><span class="p">:</span><span class="nf">build</span><span class="p">(</span><span class="n">a</span><span class="p">,</span> <span class="n">b</span><span class="p">,</span> <span class="n">c</span><span class="p">)</span> </span><span id="L-228"><a href="#L-228"><span class="linenos" data-line="228"></span></a> <span class="kd">local</span> <span class="n">len</span> <span class="o">=</span> <span class="n">self</span><span class="p">.</span><span class="n">__len</span> <span class="o">+</span> <span class="mi">1</span> </span><span id="L-229"><a href="#L-229"><span class="linenos" data-line="229"></span></a> <span class="n">self</span><span class="p">.</span><span class="n">__chars</span><span class="p">[</span><span class="n">len</span><span class="p">]</span> <span class="o">=</span> <span class="n">a</span> </span><span id="L-230"><a href="#L-230"><span class="linenos" data-line="230"></span></a> <span class="n">self</span><span class="p">.</span><span class="n">__parents</span><span class="p">[</span><span class="n">len</span><span class="p">]</span> <span class="o">=</span> <span class="n">b</span> </span><span id="L-231"><a href="#L-231"><span class="linenos" data-line="231"></span></a> <span class="n">self</span><span class="p">.</span><span class="n">__keys</span><span class="p">[</span><span class="n">len</span><span class="p">]</span> <span class="o">=</span> <span class="n">c</span> </span><span id="L-232"><a href="#L-232"><span class="linenos" data-line="232"></span></a> <span class="n">self</span><span class="p">.</span><span class="n">__len</span> <span class="o">=</span> <span class="n">len</span> </span><span id="L-233"><a href="#L-233"><span class="linenos" data-line="233"></span></a> <span class="kr">end</span> </span><span id="L-234"><a href="#L-234"><span class="linenos" data-line="234"></span></a> </span><span id="L-235"><a href="#L-235"><span class="linenos" data-line="235"></span></a> <span class="kr">function</span> <span class="nc">Proxy</span><span class="p">:</span><span class="nf">iter</span><span class="p">(</span><span class="n">i</span><span class="p">)</span> </span><span id="L-236"><a href="#L-236"><span class="linenos" data-line="236"></span></a> <span class="n">i</span> <span class="o">=</span> <span class="n">i</span> <span class="o">+</span> <span class="mi">1</span> </span><span id="L-237"><a href="#L-237"><span class="linenos" data-line="237"></span></a> <span class="kd">local</span> <span class="n">char</span> <span class="o">=</span> <span class="n">self</span><span class="p">.</span><span class="n">__chars</span><span class="p">[</span><span class="n">i</span><span class="p">]</span> </span><span id="L-238"><a href="#L-238"><span class="linenos" data-line="238"></span></a> <span class="kr">if</span> <span class="n">char</span> <span class="o">~=</span> <span class="kc">nil</span> <span class="kr">then</span> </span><span id="L-239"><a href="#L-239"><span class="linenos" data-line="239"></span></a> <span class="kr">return</span> <span class="n">i</span><span class="p">,</span> <span class="n">self</span><span class="p">[</span><span class="n">i</span><span class="p">],</span> <span class="n">self</span><span class="p">,</span> <span class="n">self</span><span class="p">.</span><span class="n">__parents</span><span class="p">[</span><span class="n">i</span><span class="p">],</span> <span class="n">self</span><span class="p">.</span><span class="n">__keys</span><span class="p">[</span><span class="n">i</span><span class="p">]</span> </span><span id="L-240"><a href="#L-240"><span class="linenos" data-line="240"></span></a> <span class="kr">end</span> </span><span id="L-241"><a href="#L-241"><span class="linenos" data-line="241"></span></a> <span class="kr">end</span> </span><span id="L-242"><a href="#L-242"><span class="linenos" data-line="242"></span></a> </span><span id="L-243"><a href="#L-243"><span class="linenos" data-line="243"></span></a> <span class="kr">function</span> <span class="nc">Node</span><span class="p">:</span><span class="nf">new_proxy</span><span class="p">()</span> </span><span id="L-244"><a href="#L-244"><span class="linenos" data-line="244"></span></a> <span class="kr">return</span> <span class="nb">setmetatable</span><span class="p">({</span> </span><span id="L-245"><a href="#L-245"><span class="linenos" data-line="245"></span></a> <span class="n">__node</span> <span class="o">=</span> <span class="n">self</span><span class="p">,</span> </span><span id="L-246"><a href="#L-246"><span class="linenos" data-line="246"></span></a> <span class="n">__chars</span> <span class="o">=</span> <span class="p">{},</span> </span><span id="L-247"><a href="#L-247"><span class="linenos" data-line="247"></span></a> <span class="n">__parents</span> <span class="o">=</span> <span class="p">{},</span> </span><span id="L-248"><a href="#L-248"><span class="linenos" data-line="248"></span></a> <span class="n">__keys</span> <span class="o">=</span> <span class="p">{},</span> </span><span id="L-249"><a href="#L-249"><span class="linenos" data-line="249"></span></a> <span class="n">__len</span> <span class="o">=</span> <span class="mi">0</span> </span><span id="L-250"><a href="#L-250"><span class="linenos" data-line="250"></span></a> <span class="p">},</span> <span class="n">Proxy</span><span class="p">)</span> </span><span id="L-251"><a href="#L-251"><span class="linenos" data-line="251"></span></a> <span class="kr">end</span> </span><span id="L-252"><a href="#L-252"><span class="linenos" data-line="252"></span></a><span class="kr">end</span> </span><span id="L-253"><a href="#L-253"><span class="linenos" data-line="253"></span></a> </span><span id="L-254"><a href="#L-254"><span class="linenos" data-line="254"></span></a><span class="c1">------------------------------------------------------------------------------------</span> </span><span id="L-255"><a href="#L-255"><span class="linenos" data-line="255"></span></a><span class="c1">--</span> </span><span id="L-256"><a href="#L-256"><span class="linenos" data-line="256"></span></a><span class="c1">-- Parser</span> </span><span id="L-257"><a href="#L-257"><span class="linenos" data-line="257"></span></a><span class="c1">--</span> </span><span id="L-258"><a href="#L-258"><span class="linenos" data-line="258"></span></a><span class="c1">------------------------------------------------------------------------------------</span> </span><span id="L-259"><a href="#L-259"><span class="linenos" data-line="259"></span></a> </span><span id="L-260"><a href="#L-260"><span class="linenos" data-line="260"></span></a><span class="kd">local</span> <span class="n">Parser</span> <span class="o">=</span> <span class="p">{}</span> </span><span id="L-261"><a href="#L-261"><span class="linenos" data-line="261"></span></a><span class="n">Parser</span><span class="p">.</span><span class="n">__index</span> <span class="o">=</span> <span class="n">Parser</span> </span><span id="L-262"><a href="#L-262"><span class="linenos" data-line="262"></span></a> </span><span id="L-263"><a href="#L-263"><span class="linenos" data-line="263"></span></a><span class="kr">function</span> <span class="nc">Parser</span><span class="p">:</span><span class="nf">read</span><span class="p">(</span><span class="n">delta</span><span class="p">)</span> </span><span id="L-264"><a href="#L-264"><span class="linenos" data-line="264"></span></a> <span class="kd">local</span> <span class="n">v</span> <span class="o">=</span> <span class="n">self</span><span class="p">.</span><span class="n">text</span><span class="p">[</span><span class="n">self</span><span class="p">.</span><span class="n">head</span> <span class="o">+</span> <span class="p">(</span><span class="n">delta</span> <span class="ow">or</span> <span class="mi">0</span><span class="p">)]</span> </span><span id="L-265"><a href="#L-265"><span class="linenos" data-line="265"></span></a> <span class="kr">return</span> <span class="n">v</span> <span class="o">==</span> <span class="kc">nil</span> <span class="ow">and</span> <span class="s2">&quot;&quot;</span> <span class="ow">or</span> <span class="n">v</span> </span><span id="L-266"><a href="#L-266"><span class="linenos" data-line="266"></span></a><span class="kr">end</span> </span><span id="L-267"><a href="#L-267"><span class="linenos" data-line="267"></span></a> </span><span id="L-268"><a href="#L-268"><span class="linenos" data-line="268"></span></a><span class="kr">function</span> <span class="nc">Parser</span><span class="p">:</span><span class="nf">advance</span><span class="p">(</span><span class="n">n</span><span class="p">)</span> </span><span id="L-269"><a href="#L-269"><span class="linenos" data-line="269"></span></a> <span class="n">self</span><span class="p">.</span><span class="n">head</span> <span class="o">=</span> <span class="n">self</span><span class="p">.</span><span class="n">head</span> <span class="o">+</span> <span class="p">(</span><span class="n">n</span> <span class="o">==</span> <span class="kc">nil</span> <span class="ow">and</span> <span class="mi">1</span> <span class="ow">or</span> <span class="n">n</span><span class="p">)</span> </span><span id="L-270"><a href="#L-270"><span class="linenos" data-line="270"></span></a><span class="kr">end</span> </span><span id="L-271"><a href="#L-271"><span class="linenos" data-line="271"></span></a> </span><span id="L-272"><a href="#L-272"><span class="linenos" data-line="272"></span></a><span class="kr">function</span> <span class="nc">Parser</span><span class="p">:</span><span class="nf">layer</span><span class="p">(</span><span class="n">n</span><span class="p">)</span> </span><span id="L-273"><a href="#L-273"><span class="linenos" data-line="273"></span></a> <span class="kr">if</span> <span class="n">n</span> <span class="o">~=</span> <span class="kc">nil</span> <span class="kr">then</span> </span><span id="L-274"><a href="#L-274"><span class="linenos" data-line="274"></span></a> <span class="kr">return</span> <span class="nb">rawget</span><span class="p">(</span><span class="n">self</span><span class="p">,</span> <span class="o">#</span><span class="n">self</span> <span class="o">+</span> <span class="n">n</span><span class="p">)</span> </span><span id="L-275"><a href="#L-275"><span class="linenos" data-line="275"></span></a> <span class="kr">end</span> </span><span id="L-276"><a href="#L-276"><span class="linenos" data-line="276"></span></a> <span class="kr">return</span> <span class="n">self</span><span class="p">[</span><span class="o">-</span><span class="mi">1</span><span class="p">]</span> </span><span id="L-277"><a href="#L-277"><span class="linenos" data-line="277"></span></a><span class="kr">end</span> </span><span id="L-278"><a href="#L-278"><span class="linenos" data-line="278"></span></a> </span><span id="L-279"><a href="#L-279"><span class="linenos" data-line="279"></span></a><span class="kr">function</span> <span class="nc">Parser</span><span class="p">:</span><span class="nf">emit</span><span class="p">(</span><span class="n">a</span><span class="p">,</span> <span class="n">b</span><span class="p">)</span> </span><span id="L-280"><a href="#L-280"><span class="linenos" data-line="280"></span></a> <span class="kd">local</span> <span class="n">layer</span> <span class="o">=</span> <span class="n">self</span><span class="p">[</span><span class="o">-</span><span class="mi">1</span><span class="p">]</span> </span><span id="L-281"><a href="#L-281"><span class="linenos" data-line="281"></span></a> <span class="kr">if</span> <span class="n">b</span> <span class="o">~=</span> <span class="kc">nil</span> <span class="kr">then</span> </span><span id="L-282"><a href="#L-282"><span class="linenos" data-line="282"></span></a> <span class="n">insert</span><span class="p">(</span><span class="n">layer</span><span class="p">,</span> <span class="n">signed_index</span><span class="p">(</span><span class="n">layer</span><span class="p">,</span> <span class="n">a</span><span class="p">),</span> <span class="n">b</span><span class="p">)</span> </span><span id="L-283"><a href="#L-283"><span class="linenos" data-line="283"></span></a> <span class="kr">else</span> </span><span id="L-284"><a href="#L-284"><span class="linenos" data-line="284"></span></a> <span class="nb">rawset</span><span class="p">(</span><span class="n">layer</span><span class="p">,</span> <span class="o">#</span><span class="n">layer</span> <span class="o">+</span> <span class="mi">1</span><span class="p">,</span> <span class="n">a</span><span class="p">)</span> </span><span id="L-285"><a href="#L-285"><span class="linenos" data-line="285"></span></a> <span class="kr">end</span> </span><span id="L-286"><a href="#L-286"><span class="linenos" data-line="286"></span></a><span class="kr">end</span> </span><span id="L-287"><a href="#L-287"><span class="linenos" data-line="287"></span></a> </span><span id="L-288"><a href="#L-288"><span class="linenos" data-line="288"></span></a><span class="kr">function</span> <span class="nc">Parser</span><span class="p">:</span><span class="nf">emit_tokens</span><span class="p">(</span><span class="n">a</span><span class="p">,</span> <span class="n">b</span><span class="p">)</span> </span><span id="L-289"><a href="#L-289"><span class="linenos" data-line="289"></span></a> <span class="kd">local</span> <span class="n">layer</span> <span class="o">=</span> <span class="n">self</span><span class="p">[</span><span class="o">-</span><span class="mi">1</span><span class="p">]</span> </span><span id="L-290"><a href="#L-290"><span class="linenos" data-line="290"></span></a> <span class="kr">if</span> <span class="n">b</span> <span class="o">~=</span> <span class="kc">nil</span> <span class="kr">then</span> </span><span id="L-291"><a href="#L-291"><span class="linenos" data-line="291"></span></a> <span class="n">a</span> <span class="o">=</span> <span class="n">signed_index</span><span class="p">(</span><span class="n">layer</span><span class="p">,</span> <span class="n">a</span><span class="p">)</span> </span><span id="L-292"><a href="#L-292"><span class="linenos" data-line="292"></span></a> <span class="kr">for</span> <span class="n">i</span> <span class="o">=</span> <span class="mi">1</span><span class="p">,</span> <span class="o">#</span><span class="n">b</span> <span class="kr">do</span> </span><span id="L-293"><a href="#L-293"><span class="linenos" data-line="293"></span></a> <span class="n">insert</span><span class="p">(</span><span class="n">layer</span><span class="p">,</span> <span class="n">a</span> <span class="o">+</span> <span class="n">i</span> <span class="o">-</span> <span class="mi">1</span><span class="p">,</span> <span class="n">b</span><span class="p">[</span><span class="n">i</span><span class="p">])</span> </span><span id="L-294"><a href="#L-294"><span class="linenos" data-line="294"></span></a> <span class="kr">end</span> </span><span id="L-295"><a href="#L-295"><span class="linenos" data-line="295"></span></a> <span class="kr">else</span> </span><span id="L-296"><a href="#L-296"><span class="linenos" data-line="296"></span></a> <span class="kd">local</span> <span class="n">len</span> <span class="o">=</span> <span class="o">#</span><span class="n">layer</span> </span><span id="L-297"><a href="#L-297"><span class="linenos" data-line="297"></span></a> <span class="kr">for</span> <span class="n">i</span> <span class="o">=</span> <span class="mi">1</span><span class="p">,</span> <span class="o">#</span><span class="n">a</span> <span class="kr">do</span> </span><span id="L-298"><a href="#L-298"><span class="linenos" data-line="298"></span></a> <span class="n">len</span> <span class="o">=</span> <span class="n">len</span> <span class="o">+</span> <span class="mi">1</span> </span><span id="L-299"><a href="#L-299"><span class="linenos" data-line="299"></span></a> <span class="nb">rawset</span><span class="p">(</span><span class="n">layer</span><span class="p">,</span> <span class="n">len</span><span class="p">,</span> <span class="n">a</span><span class="p">[</span><span class="n">i</span><span class="p">])</span> </span><span id="L-300"><a href="#L-300"><span class="linenos" data-line="300"></span></a> <span class="kr">end</span> </span><span id="L-301"><a href="#L-301"><span class="linenos" data-line="301"></span></a> <span class="kr">end</span> </span><span id="L-302"><a href="#L-302"><span class="linenos" data-line="302"></span></a><span class="kr">end</span> </span><span id="L-303"><a href="#L-303"><span class="linenos" data-line="303"></span></a> </span><span id="L-304"><a href="#L-304"><span class="linenos" data-line="304"></span></a><span class="kr">function</span> <span class="nc">Parser</span><span class="p">:</span><span class="nf">remove</span><span class="p">(</span><span class="n">n</span><span class="p">)</span> </span><span id="L-305"><a href="#L-305"><span class="linenos" data-line="305"></span></a> <span class="kd">local</span> <span class="n">layer</span> <span class="o">=</span> <span class="n">self</span><span class="p">[</span><span class="o">-</span><span class="mi">1</span><span class="p">]</span> </span><span id="L-306"><a href="#L-306"><span class="linenos" data-line="306"></span></a> <span class="kr">if</span> <span class="n">n</span> <span class="o">~=</span> <span class="kc">nil</span> <span class="kr">then</span> </span><span id="L-307"><a href="#L-307"><span class="linenos" data-line="307"></span></a> <span class="kr">return</span> <span class="n">remove</span><span class="p">(</span><span class="n">layer</span><span class="p">,</span> <span class="n">signed_index</span><span class="p">(</span><span class="n">layer</span><span class="p">,</span> <span class="n">n</span><span class="p">))</span> </span><span id="L-308"><a href="#L-308"><span class="linenos" data-line="308"></span></a> <span class="kr">end</span> </span><span id="L-309"><a href="#L-309"><span class="linenos" data-line="309"></span></a> <span class="kd">local</span> <span class="n">len</span> <span class="o">=</span> <span class="o">#</span><span class="n">layer</span> </span><span id="L-310"><a href="#L-310"><span class="linenos" data-line="310"></span></a> <span class="kd">local</span> <span class="n">token</span> <span class="o">=</span> <span class="n">layer</span><span class="p">[</span><span class="n">len</span><span class="p">]</span> </span><span id="L-311"><a href="#L-311"><span class="linenos" data-line="311"></span></a> <span class="n">layer</span><span class="p">[</span><span class="n">len</span><span class="p">]</span> <span class="o">=</span> <span class="kc">nil</span> </span><span id="L-312"><a href="#L-312"><span class="linenos" data-line="312"></span></a> <span class="kr">return</span> <span class="n">token</span> </span><span id="L-313"><a href="#L-313"><span class="linenos" data-line="313"></span></a><span class="kr">end</span> </span><span id="L-314"><a href="#L-314"><span class="linenos" data-line="314"></span></a> </span><span id="L-315"><a href="#L-315"><span class="linenos" data-line="315"></span></a><span class="kr">function</span> <span class="nc">Parser</span><span class="p">:</span><span class="nf">replace</span><span class="p">(</span><span class="n">a</span><span class="p">,</span> <span class="n">b</span><span class="p">)</span> </span><span id="L-316"><a href="#L-316"><span class="linenos" data-line="316"></span></a> <span class="kd">local</span> <span class="n">layer</span> <span class="o">=</span> <span class="n">self</span><span class="p">[</span><span class="o">-</span><span class="mi">1</span><span class="p">]</span> </span><span id="L-317"><a href="#L-317"><span class="linenos" data-line="317"></span></a> <span class="n">layer</span><span class="p">[</span><span class="n">signed_index</span><span class="p">(</span><span class="n">layer</span><span class="p">,</span> <span class="n">a</span><span class="p">)]</span> <span class="o">=</span> <span class="n">b</span> </span><span id="L-318"><a href="#L-318"><span class="linenos" data-line="318"></span></a><span class="kr">end</span> </span><span id="L-319"><a href="#L-319"><span class="linenos" data-line="319"></span></a> </span><span id="L-320"><a href="#L-320"><span class="linenos" data-line="320"></span></a><span class="c1">-- Unlike default table.concat, this respects __tostring metamethods.</span> </span><span id="L-321"><a href="#L-321"><span class="linenos" data-line="321"></span></a><span class="kr">function</span> <span class="nc">Parser</span><span class="p">:</span><span class="nf">concat</span><span class="p">(</span><span class="n">a</span><span class="p">,</span> <span class="n">b</span><span class="p">,</span> <span class="n">c</span><span class="p">)</span> </span><span id="L-322"><a href="#L-322"><span class="linenos" data-line="322"></span></a> <span class="kr">if</span> <span class="n">a</span> <span class="o">==</span> <span class="kc">nil</span> <span class="ow">or</span> <span class="n">a</span> <span class="o">&gt;</span> <span class="mi">0</span> <span class="kr">then</span> </span><span id="L-323"><a href="#L-323"><span class="linenos" data-line="323"></span></a> <span class="kr">return</span> <span class="n">self</span><span class="p">:</span><span class="n">concat</span><span class="p">(</span><span class="mi">0</span><span class="p">,</span> <span class="n">a</span><span class="p">,</span> <span class="n">b</span><span class="p">)</span> </span><span id="L-324"><a href="#L-324"><span class="linenos" data-line="324"></span></a> <span class="kr">end</span> </span><span id="L-325"><a href="#L-325"><span class="linenos" data-line="325"></span></a> <span class="kd">local</span> <span class="n">layer</span><span class="p">,</span> <span class="n">ret</span><span class="p">,</span> <span class="n">n</span> <span class="o">=</span> <span class="n">self</span><span class="p">:</span><span class="n">layer</span><span class="p">(</span><span class="n">a</span><span class="p">),</span> <span class="p">{},</span> <span class="mi">0</span> </span><span id="L-326"><a href="#L-326"><span class="linenos" data-line="326"></span></a> <span class="kr">for</span> <span class="n">i</span> <span class="o">=</span> <span class="n">b</span> <span class="ow">and</span> <span class="n">signed_index</span><span class="p">(</span><span class="n">layer</span><span class="p">,</span> <span class="n">b</span><span class="p">)</span> <span class="ow">or</span> <span class="mi">1</span><span class="p">,</span> <span class="n">c</span> <span class="ow">and</span> <span class="n">signed_index</span><span class="p">(</span><span class="n">layer</span><span class="p">,</span> <span class="n">c</span><span class="p">)</span> <span class="ow">or</span> <span class="o">#</span><span class="n">layer</span> <span class="kr">do</span> </span><span id="L-327"><a href="#L-327"><span class="linenos" data-line="327"></span></a> <span class="n">n</span> <span class="o">=</span> <span class="n">n</span> <span class="o">+</span> <span class="mi">1</span> </span><span id="L-328"><a href="#L-328"><span class="linenos" data-line="328"></span></a> <span class="n">ret</span><span class="p">[</span><span class="n">n</span><span class="p">]</span> <span class="o">=</span> <span class="nb">tostring</span><span class="p">(</span><span class="n">layer</span><span class="p">[</span><span class="n">i</span><span class="p">])</span> </span><span id="L-329"><a href="#L-329"><span class="linenos" data-line="329"></span></a> <span class="kr">end</span> </span><span id="L-330"><a href="#L-330"><span class="linenos" data-line="330"></span></a> <span class="kr">return</span> <span class="n">concat</span><span class="p">(</span><span class="n">ret</span><span class="p">)</span> </span><span id="L-331"><a href="#L-331"><span class="linenos" data-line="331"></span></a><span class="kr">end</span> </span><span id="L-332"><a href="#L-332"><span class="linenos" data-line="332"></span></a> </span><span id="L-333"><a href="#L-333"><span class="linenos" data-line="333"></span></a><span class="kr">function</span> <span class="nc">Parser</span><span class="p">:</span><span class="nf">emitted</span><span class="p">(</span><span class="n">delta</span><span class="p">)</span> </span><span id="L-334"><a href="#L-334"><span class="linenos" data-line="334"></span></a> <span class="kr">if</span> <span class="n">delta</span> <span class="o">==</span> <span class="kc">nil</span> <span class="kr">then</span> </span><span id="L-335"><a href="#L-335"><span class="linenos" data-line="335"></span></a> <span class="n">delta</span> <span class="o">=</span> <span class="o">-</span><span class="mi">1</span> </span><span id="L-336"><a href="#L-336"><span class="linenos" data-line="336"></span></a> <span class="kr">end</span> </span><span id="L-337"><a href="#L-337"><span class="linenos" data-line="337"></span></a> <span class="kd">local</span> <span class="n">i</span> <span class="o">=</span> <span class="mi">0</span> </span><span id="L-338"><a href="#L-338"><span class="linenos" data-line="338"></span></a> <span class="kr">while</span> <span class="kc">true</span> <span class="kr">do</span> </span><span id="L-339"><a href="#L-339"><span class="linenos" data-line="339"></span></a> <span class="kd">local</span> <span class="n">layer</span> <span class="o">=</span> <span class="n">self</span><span class="p">:</span><span class="n">layer</span><span class="p">(</span><span class="n">i</span><span class="p">)</span> </span><span id="L-340"><a href="#L-340"><span class="linenos" data-line="340"></span></a> <span class="kr">if</span> <span class="n">layer</span> <span class="o">==</span> <span class="kc">nil</span> <span class="kr">then</span> </span><span id="L-341"><a href="#L-341"><span class="linenos" data-line="341"></span></a> <span class="kr">return</span> <span class="kc">nil</span> </span><span id="L-342"><a href="#L-342"><span class="linenos" data-line="342"></span></a> <span class="kr">end</span> </span><span id="L-343"><a href="#L-343"><span class="linenos" data-line="343"></span></a> <span class="kd">local</span> <span class="n">layer_len</span> <span class="o">=</span> <span class="o">#</span><span class="n">layer</span> </span><span id="L-344"><a href="#L-344"><span class="linenos" data-line="344"></span></a> <span class="kr">if</span> <span class="o">-</span><span class="n">delta</span> <span class="o">&lt;=</span> <span class="n">layer_len</span> <span class="kr">then</span> </span><span id="L-345"><a href="#L-345"><span class="linenos" data-line="345"></span></a> <span class="kr">return</span> <span class="nb">rawget</span><span class="p">(</span><span class="n">layer</span><span class="p">,</span> <span class="n">layer_len</span> <span class="o">+</span> <span class="n">delta</span> <span class="o">+</span> <span class="mi">1</span><span class="p">)</span> </span><span id="L-346"><a href="#L-346"><span class="linenos" data-line="346"></span></a> <span class="kr">end</span> </span><span id="L-347"><a href="#L-347"><span class="linenos" data-line="347"></span></a> <span class="n">delta</span> <span class="o">=</span> <span class="n">delta</span> <span class="o">+</span> <span class="n">layer_len</span> </span><span id="L-348"><a href="#L-348"><span class="linenos" data-line="348"></span></a> <span class="n">i</span> <span class="o">=</span> <span class="n">i</span> <span class="o">-</span> <span class="mi">1</span> </span><span id="L-349"><a href="#L-349"><span class="linenos" data-line="349"></span></a> <span class="kr">end</span> </span><span id="L-350"><a href="#L-350"><span class="linenos" data-line="350"></span></a><span class="kr">end</span> </span><span id="L-351"><a href="#L-351"><span class="linenos" data-line="351"></span></a> </span><span id="L-352"><a href="#L-352"><span class="linenos" data-line="352"></span></a><span class="kr">function</span> <span class="nc">Parser</span><span class="p">:</span><span class="nf">push</span><span class="p">(</span><span class="n">route</span><span class="p">)</span> </span><span id="L-353"><a href="#L-353"><span class="linenos" data-line="353"></span></a> <span class="kd">local</span> <span class="n">layer</span> <span class="o">=</span> <span class="p">{</span> </span><span id="L-354"><a href="#L-354"><span class="linenos" data-line="354"></span></a> <span class="n">head</span> <span class="o">=</span> <span class="n">self</span><span class="p">.</span><span class="n">head</span><span class="p">,</span> </span><span id="L-355"><a href="#L-355"><span class="linenos" data-line="355"></span></a> <span class="n">route</span> <span class="o">=</span> <span class="n">route</span> </span><span id="L-356"><a href="#L-356"><span class="linenos" data-line="356"></span></a> <span class="p">}</span> </span><span id="L-357"><a href="#L-357"><span class="linenos" data-line="357"></span></a> <span class="n">self</span><span class="p">[</span><span class="o">#</span><span class="n">self</span> <span class="o">+</span> <span class="mi">1</span><span class="p">]</span> <span class="o">=</span> <span class="n">layer</span> </span><span id="L-358"><a href="#L-358"><span class="linenos" data-line="358"></span></a> <span class="n">self</span><span class="p">[</span><span class="o">-</span><span class="mi">1</span><span class="p">]</span> <span class="o">=</span> <span class="n">layer</span> </span><span id="L-359"><a href="#L-359"><span class="linenos" data-line="359"></span></a><span class="kr">end</span> </span><span id="L-360"><a href="#L-360"><span class="linenos" data-line="360"></span></a> </span><span id="L-361"><a href="#L-361"><span class="linenos" data-line="361"></span></a><span class="kr">function</span> <span class="nc">Parser</span><span class="p">:</span><span class="nf">push_sublayer</span><span class="p">(</span><span class="n">handler</span><span class="p">,</span> <span class="n">inherit</span><span class="p">)</span> </span><span id="L-362"><a href="#L-362"><span class="linenos" data-line="362"></span></a> <span class="kd">local</span> <span class="n">sublayer</span> <span class="o">=</span> <span class="p">{</span> </span><span id="L-363"><a href="#L-363"><span class="linenos" data-line="363"></span></a> <span class="n">handler</span> <span class="o">=</span> <span class="n">handler</span><span class="p">,</span> </span><span id="L-364"><a href="#L-364"><span class="linenos" data-line="364"></span></a> <span class="n">sublayer</span> <span class="o">=</span> <span class="kc">true</span> </span><span id="L-365"><a href="#L-365"><span class="linenos" data-line="365"></span></a> <span class="p">}</span> </span><span id="L-366"><a href="#L-366"><span class="linenos" data-line="366"></span></a> <span class="kr">if</span> <span class="n">inherit</span> <span class="kr">then</span> </span><span id="L-367"><a href="#L-367"><span class="linenos" data-line="367"></span></a> <span class="kd">local</span> <span class="n">layer</span> <span class="o">=</span> <span class="n">self</span><span class="p">[</span><span class="o">-</span><span class="mi">1</span><span class="p">]</span> </span><span id="L-368"><a href="#L-368"><span class="linenos" data-line="368"></span></a> <span class="nb">setmetatable</span><span class="p">(</span><span class="n">sublayer</span><span class="p">,</span> <span class="n">inherit_metamethods</span><span class="p">({</span> </span><span id="L-369"><a href="#L-369"><span class="linenos" data-line="369"></span></a> <span class="n">__index</span> <span class="o">=</span> <span class="n">layer</span><span class="p">,</span> </span><span id="L-370"><a href="#L-370"><span class="linenos" data-line="370"></span></a> <span class="n">__newindex</span> <span class="o">=</span> <span class="n">layer</span> </span><span id="L-371"><a href="#L-371"><span class="linenos" data-line="371"></span></a> <span class="p">},</span> <span class="nb">getmetatable</span><span class="p">(</span><span class="n">layer</span><span class="p">)))</span> </span><span id="L-372"><a href="#L-372"><span class="linenos" data-line="372"></span></a> <span class="kr">end</span> </span><span id="L-373"><a href="#L-373"><span class="linenos" data-line="373"></span></a> <span class="n">self</span><span class="p">[</span><span class="o">#</span><span class="n">self</span> <span class="o">+</span> <span class="mi">1</span><span class="p">]</span> <span class="o">=</span> <span class="n">sublayer</span> </span><span id="L-374"><a href="#L-374"><span class="linenos" data-line="374"></span></a> <span class="n">self</span><span class="p">[</span><span class="o">-</span><span class="mi">1</span><span class="p">]</span> <span class="o">=</span> <span class="n">sublayer</span> </span><span id="L-375"><a href="#L-375"><span class="linenos" data-line="375"></span></a><span class="kr">end</span> </span><span id="L-376"><a href="#L-376"><span class="linenos" data-line="376"></span></a> </span><span id="L-377"><a href="#L-377"><span class="linenos" data-line="377"></span></a><span class="kr">function</span> <span class="nc">Parser</span><span class="p">:</span><span class="nf">pop</span><span class="p">()</span> </span><span id="L-378"><a href="#L-378"><span class="linenos" data-line="378"></span></a> <span class="kd">local</span> <span class="n">len</span><span class="p">,</span> <span class="n">layer</span> <span class="o">=</span> <span class="o">#</span><span class="n">self</span> </span><span id="L-379"><a href="#L-379"><span class="linenos" data-line="379"></span></a> <span class="kr">while</span> <span class="kc">true</span> <span class="kr">do</span> </span><span id="L-380"><a href="#L-380"><span class="linenos" data-line="380"></span></a> <span class="n">layer</span> <span class="o">=</span> <span class="n">self</span><span class="p">[</span><span class="n">len</span><span class="p">]</span> </span><span id="L-381"><a href="#L-381"><span class="linenos" data-line="381"></span></a> <span class="n">self</span><span class="p">[</span><span class="n">len</span><span class="p">]</span> <span class="o">=</span> <span class="kc">nil</span> </span><span id="L-382"><a href="#L-382"><span class="linenos" data-line="382"></span></a> <span class="n">len</span> <span class="o">=</span> <span class="n">len</span> <span class="o">-</span> <span class="mi">1</span> </span><span id="L-383"><a href="#L-383"><span class="linenos" data-line="383"></span></a> <span class="kd">local</span> <span class="n">new</span> <span class="o">=</span> <span class="n">self</span><span class="p">[</span><span class="n">len</span><span class="p">]</span> </span><span id="L-384"><a href="#L-384"><span class="linenos" data-line="384"></span></a> <span class="n">self</span><span class="p">[</span><span class="o">-</span><span class="mi">1</span><span class="p">]</span> <span class="o">=</span> <span class="n">new</span> <span class="o">==</span> <span class="kc">nil</span> <span class="ow">and</span> <span class="n">self</span> <span class="ow">or</span> <span class="n">new</span> </span><span id="L-385"><a href="#L-385"><span class="linenos" data-line="385"></span></a> <span class="kr">if</span> <span class="n">layer</span><span class="p">.</span><span class="n">sublayer</span> <span class="o">==</span> <span class="kc">nil</span> <span class="kr">then</span> </span><span id="L-386"><a href="#L-386"><span class="linenos" data-line="386"></span></a> <span class="kr">break</span> </span><span id="L-387"><a href="#L-387"><span class="linenos" data-line="387"></span></a> <span class="kr">end</span> </span><span id="L-388"><a href="#L-388"><span class="linenos" data-line="388"></span></a> <span class="n">self</span><span class="p">:</span><span class="n">emit_tokens</span><span class="p">(</span><span class="n">layer</span><span class="p">)</span> </span><span id="L-389"><a href="#L-389"><span class="linenos" data-line="389"></span></a> <span class="kr">end</span> </span><span id="L-390"><a href="#L-390"><span class="linenos" data-line="390"></span></a> <span class="kr">return</span> <span class="n">layer</span> </span><span id="L-391"><a href="#L-391"><span class="linenos" data-line="391"></span></a><span class="kr">end</span> </span><span id="L-392"><a href="#L-392"><span class="linenos" data-line="392"></span></a> </span><span id="L-393"><a href="#L-393"><span class="linenos" data-line="393"></span></a><span class="kr">function</span> <span class="nc">Parser</span><span class="p">:</span><span class="nf">pop_sublayer</span><span class="p">()</span> </span><span id="L-394"><a href="#L-394"><span class="linenos" data-line="394"></span></a> <span class="kd">local</span> <span class="n">len</span><span class="p">,</span> <span class="n">layer</span> <span class="o">=</span> <span class="o">#</span><span class="n">self</span><span class="p">,</span> <span class="n">self</span><span class="p">[</span><span class="o">-</span><span class="mi">1</span><span class="p">]</span> </span><span id="L-395"><a href="#L-395"><span class="linenos" data-line="395"></span></a> <span class="n">self</span><span class="p">[</span><span class="n">len</span><span class="p">]</span> <span class="o">=</span> <span class="kc">nil</span> </span><span id="L-396"><a href="#L-396"><span class="linenos" data-line="396"></span></a> <span class="kd">local</span> <span class="n">new</span> <span class="o">=</span> <span class="n">self</span><span class="p">[</span><span class="n">len</span> <span class="o">-</span> <span class="mi">1</span><span class="p">]</span> </span><span id="L-397"><a href="#L-397"><span class="linenos" data-line="397"></span></a> <span class="n">self</span><span class="p">[</span><span class="o">-</span><span class="mi">1</span><span class="p">]</span> <span class="o">=</span> <span class="n">new</span> <span class="o">==</span> <span class="kc">nil</span> <span class="ow">and</span> <span class="n">self</span> <span class="ow">or</span> <span class="n">new</span> </span><span id="L-398"><a href="#L-398"><span class="linenos" data-line="398"></span></a> <span class="nb">setmetatable</span><span class="p">(</span><span class="n">layer</span><span class="p">,</span> <span class="kc">nil</span><span class="p">)</span> </span><span id="L-399"><a href="#L-399"><span class="linenos" data-line="399"></span></a> <span class="n">layer</span><span class="p">.</span><span class="n">sublayer</span> <span class="o">=</span> <span class="kc">nil</span> </span><span id="L-400"><a href="#L-400"><span class="linenos" data-line="400"></span></a> <span class="kr">return</span> <span class="n">layer</span> </span><span id="L-401"><a href="#L-401"><span class="linenos" data-line="401"></span></a><span class="kr">end</span> </span><span id="L-402"><a href="#L-402"><span class="linenos" data-line="402"></span></a> </span><span id="L-403"><a href="#L-403"><span class="linenos" data-line="403"></span></a><span class="kr">function</span> <span class="nc">Parser</span><span class="p">:</span><span class="nf">get</span><span class="p">(</span><span class="n">route</span><span class="p">,</span> <span class="p">...)</span> </span><span id="L-404"><a href="#L-404"><span class="linenos" data-line="404"></span></a> <span class="n">self</span><span class="p">:</span><span class="n">push</span><span class="p">(</span><span class="n">route</span><span class="p">)</span> </span><span id="L-405"><a href="#L-405"><span class="linenos" data-line="405"></span></a> <span class="kd">local</span> <span class="n">layer</span> <span class="o">=</span> <span class="n">route</span><span class="p">(</span><span class="n">self</span><span class="p">,</span> <span class="p">...)</span> </span><span id="L-406"><a href="#L-406"><span class="linenos" data-line="406"></span></a> <span class="kr">if</span> <span class="n">layer</span> <span class="o">==</span> <span class="kc">nil</span> <span class="kr">then</span> </span><span id="L-407"><a href="#L-407"><span class="linenos" data-line="407"></span></a> <span class="n">layer</span> <span class="o">=</span> <span class="n">self</span><span class="p">:</span><span class="n">traverse</span><span class="p">()</span> </span><span id="L-408"><a href="#L-408"><span class="linenos" data-line="408"></span></a> <span class="kr">end</span> </span><span id="L-409"><a href="#L-409"><span class="linenos" data-line="409"></span></a> <span class="kr">return</span> <span class="n">layer</span> </span><span id="L-410"><a href="#L-410"><span class="linenos" data-line="410"></span></a><span class="kr">end</span> </span><span id="L-411"><a href="#L-411"><span class="linenos" data-line="411"></span></a> </span><span id="L-412"><a href="#L-412"><span class="linenos" data-line="412"></span></a><span class="kr">function</span> <span class="nc">Parser</span><span class="p">:</span><span class="nf">try</span><span class="p">(</span><span class="n">route</span><span class="p">,</span> <span class="p">...)</span> </span><span id="L-413"><a href="#L-413"><span class="linenos" data-line="413"></span></a> <span class="kd">local</span> <span class="n">failed_layer</span> <span class="o">=</span> <span class="n">get_nested</span><span class="p">(</span><span class="n">self</span><span class="p">.</span><span class="n">failed_routes</span><span class="p">,</span> <span class="n">route</span><span class="p">,</span> <span class="n">self</span><span class="p">.</span><span class="n">head</span><span class="p">)</span> </span><span id="L-414"><a href="#L-414"><span class="linenos" data-line="414"></span></a> <span class="kr">if</span> <span class="n">failed_layer</span> <span class="o">~=</span> <span class="kc">nil</span> <span class="kr">then</span> </span><span id="L-415"><a href="#L-415"><span class="linenos" data-line="415"></span></a> <span class="kr">return</span> <span class="kc">false</span><span class="p">,</span> <span class="n">failed_layer</span> </span><span id="L-416"><a href="#L-416"><span class="linenos" data-line="416"></span></a> <span class="kr">end</span> </span><span id="L-417"><a href="#L-417"><span class="linenos" data-line="417"></span></a> <span class="kd">local</span> <span class="n">layer</span> <span class="o">=</span> <span class="n">self</span><span class="p">:</span><span class="n">get</span><span class="p">(</span><span class="n">route</span><span class="p">,</span> <span class="p">...)</span> </span><span id="L-418"><a href="#L-418"><span class="linenos" data-line="418"></span></a> <span class="kr">return</span> <span class="ow">not</span> <span class="n">layer</span><span class="p">.</span><span class="n">fail</span><span class="p">,</span> <span class="n">layer</span> </span><span id="L-419"><a href="#L-419"><span class="linenos" data-line="419"></span></a><span class="kr">end</span> </span><span id="L-420"><a href="#L-420"><span class="linenos" data-line="420"></span></a> </span><span id="L-421"><a href="#L-421"><span class="linenos" data-line="421"></span></a><span class="kr">function</span> <span class="nc">Parser</span><span class="p">:</span><span class="nf">consume</span><span class="p">(</span><span class="n">this</span><span class="p">,</span> <span class="p">...)</span> </span><span id="L-422"><a href="#L-422"><span class="linenos" data-line="422"></span></a> <span class="kd">local</span> <span class="n">layer</span> <span class="o">=</span> <span class="n">self</span><span class="p">[</span><span class="o">-</span><span class="mi">1</span><span class="p">]</span> </span><span id="L-423"><a href="#L-423"><span class="linenos" data-line="423"></span></a> <span class="kr">if</span> <span class="n">this</span> <span class="o">==</span> <span class="kc">nil</span> <span class="kr">then</span> </span><span id="L-424"><a href="#L-424"><span class="linenos" data-line="424"></span></a> <span class="n">this</span> <span class="o">=</span> <span class="n">self</span><span class="p">:</span><span class="n">read</span><span class="p">()</span> </span><span id="L-425"><a href="#L-425"><span class="linenos" data-line="425"></span></a> <span class="kr">end</span> </span><span id="L-426"><a href="#L-426"><span class="linenos" data-line="426"></span></a> <span class="kr">return</span> <span class="p">(</span><span class="n">layer</span><span class="p">.</span><span class="n">override</span> <span class="ow">or</span> <span class="n">layer</span><span class="p">.</span><span class="n">handler</span><span class="p">)(</span><span class="n">self</span><span class="p">,</span> <span class="n">this</span><span class="p">,</span> <span class="p">...)</span> </span><span id="L-427"><a href="#L-427"><span class="linenos" data-line="427"></span></a><span class="kr">end</span> </span><span id="L-428"><a href="#L-428"><span class="linenos" data-line="428"></span></a> </span><span id="L-429"><a href="#L-429"><span class="linenos" data-line="429"></span></a><span class="kr">function</span> <span class="nc">Parser</span><span class="p">:</span><span class="nf">fail_route</span><span class="p">()</span> </span><span id="L-430"><a href="#L-430"><span class="linenos" data-line="430"></span></a> <span class="kd">local</span> <span class="n">layer</span> <span class="o">=</span> <span class="n">self</span><span class="p">:</span><span class="n">pop</span><span class="p">()</span> </span><span id="L-431"><a href="#L-431"><span class="linenos" data-line="431"></span></a> <span class="n">layer</span><span class="p">.</span><span class="n">fail</span> <span class="o">=</span> <span class="kc">true</span> </span><span id="L-432"><a href="#L-432"><span class="linenos" data-line="432"></span></a> <span class="n">set_nested</span><span class="p">(</span><span class="n">self</span><span class="p">,</span> <span class="s2">&quot;failed_routes&quot;</span><span class="p">,</span> <span class="n">layer</span><span class="p">.</span><span class="n">route</span><span class="p">,</span> <span class="n">layer</span><span class="p">.</span><span class="n">head</span><span class="p">,</span> <span class="n">layer</span><span class="p">)</span> </span><span id="L-433"><a href="#L-433"><span class="linenos" data-line="433"></span></a> <span class="n">self</span><span class="p">.</span><span class="n">head</span> <span class="o">=</span> <span class="n">layer</span><span class="p">.</span><span class="n">head</span> </span><span id="L-434"><a href="#L-434"><span class="linenos" data-line="434"></span></a> <span class="kr">return</span> <span class="n">layer</span> </span><span id="L-435"><a href="#L-435"><span class="linenos" data-line="435"></span></a><span class="kr">end</span> </span><span id="L-436"><a href="#L-436"><span class="linenos" data-line="436"></span></a> </span><span id="L-437"><a href="#L-437"><span class="linenos" data-line="437"></span></a><span class="kr">function</span> <span class="nc">Parser</span><span class="p">:</span><span class="nf">traverse</span><span class="p">()</span> </span><span id="L-438"><a href="#L-438"><span class="linenos" data-line="438"></span></a> <span class="kr">while</span> <span class="kc">true</span> <span class="kr">do</span> </span><span id="L-439"><a href="#L-439"><span class="linenos" data-line="439"></span></a> <span class="kd">local</span> <span class="n">layer</span> <span class="o">=</span> <span class="n">self</span><span class="p">:</span><span class="n">consume</span><span class="p">()</span> </span><span id="L-440"><a href="#L-440"><span class="linenos" data-line="440"></span></a> <span class="kr">if</span> <span class="n">layer</span> <span class="o">~=</span> <span class="kc">nil</span> <span class="kr">then</span> </span><span id="L-441"><a href="#L-441"><span class="linenos" data-line="441"></span></a> <span class="kr">return</span> <span class="n">layer</span> </span><span id="L-442"><a href="#L-442"><span class="linenos" data-line="442"></span></a> <span class="kr">end</span> </span><span id="L-443"><a href="#L-443"><span class="linenos" data-line="443"></span></a> <span class="n">self</span><span class="p">:</span><span class="n">advance</span><span class="p">()</span> </span><span id="L-444"><a href="#L-444"><span class="linenos" data-line="444"></span></a> <span class="kr">end</span> </span><span id="L-445"><a href="#L-445"><span class="linenos" data-line="445"></span></a><span class="kr">end</span> </span><span id="L-446"><a href="#L-446"><span class="linenos" data-line="446"></span></a> </span><span id="L-447"><a href="#L-447"><span class="linenos" data-line="447"></span></a><span class="c1">-- Converts a handler into a switch table the first time it&#39;s called, which avoids creating unnecessary objects, and prevents any scoping issues caused by parser methods being assigned to table keys before they&#39;ve been declared.</span> </span><span id="L-448"><a href="#L-448"><span class="linenos" data-line="448"></span></a><span class="c1">-- false is used as the default key.</span> </span><span id="L-449"><a href="#L-449"><span class="linenos" data-line="449"></span></a><span class="kr">do</span> </span><span id="L-450"><a href="#L-450"><span class="linenos" data-line="450"></span></a> <span class="kd">local</span> <span class="n">Switch</span> <span class="o">=</span> <span class="p">{}</span> </span><span id="L-451"><a href="#L-451"><span class="linenos" data-line="451"></span></a> </span><span id="L-452"><a href="#L-452"><span class="linenos" data-line="452"></span></a> <span class="kr">function</span> <span class="nc">Switch</span><span class="p">:</span><span class="nf">__call</span><span class="p">(</span><span class="n">parser</span><span class="p">,</span> <span class="n">this</span><span class="p">)</span> </span><span id="L-453"><a href="#L-453"><span class="linenos" data-line="453"></span></a> <span class="kr">return</span> <span class="p">(</span><span class="n">self</span><span class="p">[</span><span class="n">this</span><span class="p">]</span> <span class="ow">or</span> <span class="n">self</span><span class="p">[</span><span class="kc">false</span><span class="p">])(</span><span class="n">parser</span><span class="p">,</span> <span class="n">this</span><span class="p">)</span> </span><span id="L-454"><a href="#L-454"><span class="linenos" data-line="454"></span></a> <span class="kr">end</span> </span><span id="L-455"><a href="#L-455"><span class="linenos" data-line="455"></span></a> </span><span id="L-456"><a href="#L-456"><span class="linenos" data-line="456"></span></a> <span class="kr">function</span> <span class="nc">Parser</span><span class="p">:</span><span class="nf">switch</span><span class="p">(</span><span class="n">func</span><span class="p">,</span> <span class="n">t</span><span class="p">)</span> </span><span id="L-457"><a href="#L-457"><span class="linenos" data-line="457"></span></a> <span class="kd">local</span> <span class="n">layer</span> <span class="o">=</span> <span class="n">self</span><span class="p">[</span><span class="o">-</span><span class="mi">1</span><span class="p">]</span> </span><span id="L-458"><a href="#L-458"><span class="linenos" data-line="458"></span></a> <span class="c1">-- Point handler to the new switch table if the calling function is the current handler.</span> </span><span id="L-459"><a href="#L-459"><span class="linenos" data-line="459"></span></a> <span class="kr">if</span> <span class="n">layer</span><span class="p">.</span><span class="n">handler</span> <span class="o">==</span> <span class="n">func</span> <span class="kr">then</span> </span><span id="L-460"><a href="#L-460"><span class="linenos" data-line="460"></span></a> <span class="n">layer</span><span class="p">.</span><span class="n">handler</span> <span class="o">=</span> <span class="n">t</span> </span><span id="L-461"><a href="#L-461"><span class="linenos" data-line="461"></span></a> <span class="kr">end</span> </span><span id="L-462"><a href="#L-462"><span class="linenos" data-line="462"></span></a> <span class="kr">return</span> <span class="nb">setmetatable</span><span class="p">(</span><span class="n">t</span><span class="p">,</span> <span class="n">Switch</span><span class="p">)</span> </span><span id="L-463"><a href="#L-463"><span class="linenos" data-line="463"></span></a> <span class="kr">end</span> </span><span id="L-464"><a href="#L-464"><span class="linenos" data-line="464"></span></a><span class="kr">end</span> </span><span id="L-465"><a href="#L-465"><span class="linenos" data-line="465"></span></a> </span><span id="L-466"><a href="#L-466"><span class="linenos" data-line="466"></span></a><span class="c1">-- 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.</span> </span><span id="L-467"><a href="#L-467"><span class="linenos" data-line="467"></span></a><span class="kr">function</span> <span class="nc">Parser</span><span class="p">:</span><span class="nf">new_class</span><span class="p">()</span> </span><span id="L-468"><a href="#L-468"><span class="linenos" data-line="468"></span></a> <span class="kd">local</span> <span class="n">t</span> <span class="o">=</span> <span class="p">{}</span> </span><span id="L-469"><a href="#L-469"><span class="linenos" data-line="469"></span></a> <span class="n">t</span><span class="p">.</span><span class="n">__index</span> <span class="o">=</span> <span class="n">t</span> </span><span id="L-470"><a href="#L-470"><span class="linenos" data-line="470"></span></a> <span class="kr">return</span> <span class="nb">setmetatable</span><span class="p">(</span><span class="n">inherit_metamethods</span><span class="p">(</span><span class="n">t</span><span class="p">,</span> <span class="n">self</span><span class="p">),</span> <span class="n">self</span><span class="p">)</span> </span><span id="L-471"><a href="#L-471"><span class="linenos" data-line="471"></span></a><span class="kr">end</span> </span><span id="L-472"><a href="#L-472"><span class="linenos" data-line="472"></span></a> </span><span id="L-473"><a href="#L-473"><span class="linenos" data-line="473"></span></a><span class="c1">-- Generate a new parser object, which is used for a specific parse.</span> </span><span id="L-474"><a href="#L-474"><span class="linenos" data-line="474"></span></a><span class="kr">function</span> <span class="nc">Parser</span><span class="p">:</span><span class="nf">new</span><span class="p">(</span><span class="n">text</span><span class="p">)</span> </span><span id="L-475"><a href="#L-475"><span class="linenos" data-line="475"></span></a> <span class="kr">return</span> <span class="nb">setmetatable</span><span class="p">({</span> </span><span id="L-476"><a href="#L-476"><span class="linenos" data-line="476"></span></a> <span class="n">text</span> <span class="o">=</span> <span class="n">text</span><span class="p">,</span> </span><span id="L-477"><a href="#L-477"><span class="linenos" data-line="477"></span></a> <span class="n">head</span> <span class="o">=</span> <span class="mi">1</span> </span><span id="L-478"><a href="#L-478"><span class="linenos" data-line="478"></span></a> <span class="p">},</span> <span class="n">self</span><span class="p">)</span> </span><span id="L-479"><a href="#L-479"><span class="linenos" data-line="479"></span></a><span class="kr">end</span> </span><span id="L-480"><a href="#L-480"><span class="linenos" data-line="480"></span></a> </span><span id="L-481"><a href="#L-481"><span class="linenos" data-line="481"></span></a><span class="kr">function</span> <span class="nc">Parser</span><span class="p">:</span><span class="nf">parse</span><span class="p">(</span><span class="n">data</span><span class="p">)</span> </span><span id="L-482"><a href="#L-482"><span class="linenos" data-line="482"></span></a> <span class="kd">local</span> <span class="n">parser</span> <span class="o">=</span> <span class="n">self</span><span class="p">:</span><span class="n">new</span><span class="p">(</span><span class="n">data</span><span class="p">.</span><span class="n">text</span><span class="p">)</span> </span><span id="L-483"><a href="#L-483"><span class="linenos" data-line="483"></span></a> <span class="kd">local</span> <span class="n">success</span><span class="p">,</span> <span class="n">tokens</span> <span class="o">=</span> <span class="n">parser</span><span class="p">:</span><span class="n">try</span><span class="p">(</span><span class="n">unpack</span><span class="p">(</span><span class="n">data</span><span class="p">.</span><span class="n">route</span><span class="p">))</span> </span><span id="L-484"><a href="#L-484"><span class="linenos" data-line="484"></span></a> <span class="kr">if</span> <span class="o">#</span><span class="n">parser</span> <span class="o">&gt;</span> <span class="mi">0</span> <span class="kr">then</span> </span><span id="L-485"><a href="#L-485"><span class="linenos" data-line="485"></span></a> <span class="c1">-- This shouldn&#39;t happen.</span> </span><span id="L-486"><a href="#L-486"><span class="linenos" data-line="486"></span></a> <span class="nb">error</span><span class="p">(</span><span class="s2">&quot;Parser exited with non-empty stack.&quot;</span><span class="p">)</span> </span><span id="L-487"><a href="#L-487"><span class="linenos" data-line="487"></span></a> <span class="kr">elseif</span> <span class="n">success</span> <span class="kr">then</span> </span><span id="L-488"><a href="#L-488"><span class="linenos" data-line="488"></span></a> <span class="kd">local</span> <span class="n">node</span> <span class="o">=</span> <span class="n">data</span><span class="p">.</span><span class="n">node</span> </span><span id="L-489"><a href="#L-489"><span class="linenos" data-line="489"></span></a> <span class="kr">return</span> <span class="kc">true</span><span class="p">,</span> <span class="n">node</span><span class="p">[</span><span class="mi">1</span><span class="p">]:</span><span class="n">new</span><span class="p">(</span><span class="n">tokens</span><span class="p">,</span> <span class="n">unpack</span><span class="p">(</span><span class="n">node</span><span class="p">,</span> <span class="mi">2</span><span class="p">)),</span> <span class="n">parser</span> </span><span id="L-490"><a href="#L-490"><span class="linenos" data-line="490"></span></a> <span class="kr">elseif</span> <span class="n">data</span><span class="p">.</span><span class="n">allow_fail</span> <span class="kr">then</span> </span><span id="L-491"><a href="#L-491"><span class="linenos" data-line="491"></span></a> <span class="kr">return</span> <span class="kc">false</span><span class="p">,</span> <span class="kc">nil</span><span class="p">,</span> <span class="n">parser</span> </span><span id="L-492"><a href="#L-492"><span class="linenos" data-line="492"></span></a> <span class="kr">end</span> </span><span id="L-493"><a href="#L-493"><span class="linenos" data-line="493"></span></a> <span class="nb">error</span><span class="p">(</span><span class="s2">&quot;Parser exited with failed route.&quot;</span><span class="p">)</span> </span><span id="L-494"><a href="#L-494"><span class="linenos" data-line="494"></span></a><span class="kr">end</span> </span><span id="L-495"><a href="#L-495"><span class="linenos" data-line="495"></span></a> </span><span id="L-496"><a href="#L-496"><span class="linenos" data-line="496"></span></a><span class="n">export</span><span class="p">.</span><span class="n">class_else_type</span> <span class="o">=</span> <span class="n">class_else_type</span> </span><span id="L-497"><a href="#L-497"><span class="linenos" data-line="497"></span></a><span class="n">export</span><span class="p">.</span><span class="n">is_node</span> <span class="o">=</span> <span class="n">is_node</span> </span><span id="L-498"><a href="#L-498"><span class="linenos" data-line="498"></span></a><span class="n">export</span><span class="p">.</span><span class="n">tostring</span> <span class="o">=</span> <span class="nb">tostring</span> </span><span id="L-499"><a href="#L-499"><span class="linenos" data-line="499"></span></a> </span><span id="L-500"><a href="#L-500"><span class="linenos" data-line="500"></span></a><span class="kr">function</span> <span class="nc">export</span><span class="p">.</span><span class="nf">new</span><span class="p">()</span> </span><span id="L-501"><a href="#L-501"><span class="linenos" data-line="501"></span></a> <span class="kr">return</span> <span class="n">Parser</span><span class="p">:</span><span class="n">new_class</span><span class="p">(),</span> <span class="n">Node</span><span class="p">:</span><span class="n">new_class</span><span class="p">(</span><span class="s2">&quot;node&quot;</span><span class="p">)</span> </span><span id="L-502"><a href="#L-502"><span class="linenos" data-line="502"></span></a><span class="kr">end</span> </span><span id="L-503"><a href="#L-503"><span class="linenos" data-line="503"></span></a> </span><span id="L-504"><a href="#L-504"><span class="linenos" data-line="504"></span></a><span class="kr">return</span> <span class="n">export</span> </span></pre></div></div><!--esi <esi:include src="/esitest-fa8a495983347898/content" /> --><noscript><img src="https://login.wikimedia.org/wiki/Special:CentralAutoLogin/start?type=1x1&amp;useformat=desktop" alt="" width="1" height="1" style="border: none; position: absolute;"></noscript> <div class="printfooter" data-nosnippet="">Retrieved from "<a dir="ltr" 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