stackedit转为TeX表达式的正则替换规则
stackedit是一个比较好的在线数学编辑器, 可以随时写出漂亮的数学公式. 支持mathjax语法. 使用UserCustom extension中如下代码:
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userCustom.onPagedownConfigure = function (editor) { var thmCounter = { num: 0 }; var excsCounter = { num: 0 }; var environmentMap = { thm: { title: "Theorem" ,counter: thmCounter }, lem: { title: "Lemma" ,counter: thmCounter }, cor: { title: "Corollary" ,counter: thmCounter }, prop: { title: "Property" ,counter: thmCounter }, defn: { title: "Definition" ,counter: thmCounter }, rem: { title: "Remark" ,counter: thmCounter }, prob: { title: "Problem" ,counter: excsCounter }, excs: { title: "Exercise" ,counter: excsCounter }, examp: { title: "Example" ,counter: excsCounter }, proof: { title: "Proof" }, claim: { title: "Claim" } }; var converter = editor.getConverter(); // Save the preConversion callbacks stack var preConversion = converter.hooks.preConversion; converter.hooks.preConversion = function (text) { // Change \begin...\end to /begin.../end to avoid MathJax processing text = text.replace(/\\begin{(\w+)}([\s\S]*?)\\end{\1}/g, function (wholeMatch, m1, m2) { if(!environmentMap[m1]) return wholeMatch; // At this stage we need to keep the same number of characters for accurate section parsing return '/begin{' + m1 + '}' + m2 + '/end{' + m1 + '}'; }); // Transform \title and \section into markdown title to take benefit of partial rendering text = text.replace(/\\(\w+){([^\r\n}]+)}/g, function (wholeMatch, m1, m2) { // At this stage we need to keep the same number of characters for accurate section parsing if (m1 == 'section') { // \section{} has to be replaced by 10 chars return '\n### ' + m2 + '\n'; } if (m1 == 'subsection') { // \subsection{} has to be replaced by 13 chars return '\n#### ' + m2 + '\n'; } if (m1 == 'subsubsection') { // \subsubsection{} has to be replaced by 16 chars return '\n##### ' + m2 + '\n'; } if (m1 == 'title') { // \title{} has to be replaced by 8 chars return '\n## ' + m2 + '\n'; } return wholeMatch; }); // We are replacing the preConversion stack, call the other preConversion callbacks from the old stack return preConversion(text); }; converter.hooks.chain("preBlockGamut", function (text, blockGamutHookCallback) { text = text.replace(/\\ref{(\w+):(\d+)}/g, function (wholeMatch, m1, m2) { if(!environmentMap[m1]) return wholeMatch; return '<a class="latex_ref" href="#' + m1 + ':' + m2 + '">' + environmentMap[m1].title + ' ' + m2 + '</a>'; }); text = text.replace(/\\(author|date){([\s\S]*?)}/g, '<div class="latex_$1">$2</div>'); return text.replace(/\/begin{(\w+)}([\s\S]*?)\/end{\1}/g, function (wholeMatch, m1, m2) { if(!environmentMap[m1]) return wholeMatch; var result = '<div class="latex_' + m1 + '"><span class="latex_title"></span>' + blockGamutHookCallback(m2); if (m1 == "proof") { result += '<span class="latex_proofend" style="float:right">$■$</span>'; } return result + '</div>'; }); }); var previewContentsElt = document.getElementById('preview-contents'); editor.hooks.chain('onPreviewRefresh', function() { thmCounter.num = 0; excsCounter.num = 0; _.each(previewContentsElt.querySelectorAll('[class^="latex_"]'), function(elt) { var key = elt.className.match(/^latex_(\S+)/)[1]; var environment = environmentMap[key]; if(!environment) return; var title = environment.title; if(environment.counter) { environment.counter.num++; title += ' ' + environment.counter.num; elt.id = key + ':' + environment.counter.num; } elt.querySelector('.latex_title').innerHTML = title + '.'; }); }); }; userCustom.onReady = function () { var style = [ '.latex_thm, .latex_lem, .latex_cor, .latex_defn, .latex_prop, .latex_rem, .latex_claim {', ' font-style:italic;', ' display: block;', ' margin:15px 0;', '}', '.latex_prob, .latex_examp, .latex_excs, .latex_proof {', ' font-style:normal;', ' margin: 10px 0;', ' display: block;', '}', '.latex_title {', ' float:left;', ' font-weight:bold;', ' padding-right: 10px;', '}', '.latex_proofend {', ' float:right;', '}', ].join('\n'); $("head").append($('<style type="text/css">').html(style)); }; |
可以非常容易的写出定理等环境: 例如/begin{thm}.../end{thm}, 可以看到与TeX的写法略有不同.
下面我利用WinEdt的正则表达式, 将上述/begin{thm}.../end{thm}转换为标准的\begin{thm}...\end{thm}.
设置如图所示, 然后点击Replace All即可.
需要注意的是WinEdt默认的就是非贪婪(non-greedy)模式, 这与传统的RegEx是不同的.
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