134 lines
3.6 KiB
JavaScript
134 lines
3.6 KiB
JavaScript
// 这一步非常耗时
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try {
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// mobile不要
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if(!Mobile.isMobile()) {
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require(['//cdn.mathjax.org/mathjax/latest/MathJax.js?config=TeX-AMS-MML_HTMLorMML']);
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}
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} catch(e) {
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}
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function bindMathJaxHooks(converter) {
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var msie = /msie/.test(navigator.userAgent.toLowerCase());
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var inline = "$"; // the inline math delimiter
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//
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// The pattern for math delimiters and special symbols
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// needed for searching for math in the page.
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//
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var SPLIT = /(\$\$?|\\(?:begin|end)\{[a-z]*\*?\}|\\[\\{}$]|[{}]|(?:\n\s*)+|@@\d+@@)/i;
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//
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// The math is in blocks i through j, so
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// collect it into one block and clear the others.
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// Replace &, <, and > by named entities.
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// For IE, put <br> at the ends of comments since IE removes \n.
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// Clear the current math positions and store the index of the
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// math, then push the math string onto the storage array.
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//
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function processMath(i, j) {
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var block = blocks.slice(i, j + 1).join("").replace(/&/g, "&") // use
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// HTML
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// entity
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// for
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// &
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.replace(/</g, "<") // use HTML entity for <
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.replace(/>/g, ">") // use HTML entity for >
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;
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if (msie) {
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block = block.replace(/(%[^\n]*)\n/g, "$1<br/>\n")
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}
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while (j > i) {
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blocks[j] = "";
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j--
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}
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blocks[i] = "@@" + math.length + "@@";
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math.push(block);
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start = end = last = null;
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}
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//
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// Break up the text into its component parts and search
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// through them for math delimiters, braces, linebreaks, etc.
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// Math delimiters must match and braces must balance.
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// Don't allow math to pass through a double linebreak
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// (which will be a paragraph).
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//
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function removeMath(text) {
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start = end = last = null; // for tracking math delimiters
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math = []; // stores math strings for latter
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blocks = text.replace(/\r\n?/g, "\n").split(SPLIT);
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for ( var i = 1, m = blocks.length; i < m; i += 2) {
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var block = blocks[i];
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if (block.charAt(0) === "@") {
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//
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// Things that look like our math markers will get
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// stored and then retrieved along with the math.
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//
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blocks[i] = "@@" + math.length + "@@";
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math.push(block);
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} else if (start) {
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//
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// If we are in math, look for the end delimiter,
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// but don't go past double line breaks, and
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// and balance braces within the math.
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//
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if (block === end) {
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if (braces) {
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last = i
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} else {
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processMath(start, i)
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}
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} else if (block.match(/\n.*\n/)) {
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if (last) {
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i = last;
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processMath(start, i)
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}
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start = end = last = null;
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braces = 0;
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} else if (block === "{") {
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braces++
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} else if (block === "}" && braces) {
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braces--
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}
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} else {
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//
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// Look for math start delimiters and when
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// found, set up the end delimiter.
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//
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// jiawzhang: to avoid handle $LaTex expression$, since sometimes, it conflicts. Handle $$LaTeX expression$$ only.
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// if (block === inline || block === "$$") {
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if (block === "$$") {
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start = i;
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end = block;
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braces = 0;
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} else if (block.substr(1, 5) === "begin") {
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start = i;
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end = "\\end" + block.substr(6);
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braces = 0;
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}
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}
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}
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if (last) {
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processMath(start, last)
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}
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return blocks.join("");
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}
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//
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// Put back the math strings that were saved,
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// and clear the math array (no need to keep it around).
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//
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function replaceMath(text) {
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text = text.replace(/@@(\d+)@@/g, function(match, n) {
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return math[n]
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});
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math = null;
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return text;
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}
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converter.hooks.chain("preConversion", removeMath);
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converter.hooks.chain("postConversion", replaceMath);
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}
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