127 lines
3.9 KiB
JavaScript
127 lines
3.9 KiB
JavaScript
// modified from https://github.com/classeur/markdown-it-mathjax
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(function(root, factory) {
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if (typeof exports === 'object') {
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module.exports = factory()
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} else {
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root.markdownitMathjax = factory()
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}
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})(this, function() {
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function math(state, silent) {
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if (state.md.meta.mathjax === false) {
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return false
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}
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var startMathPos = state.pos
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if (state.src.charCodeAt(startMathPos) !== 0x5C /* \ */) {
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return false
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}
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var match = state.src.slice(++startMathPos).match(/^(?:\\\[|\\\(|begin\{([^}]*)\})/)
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if (!match) {
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return false
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}
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startMathPos += match[0].length
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var type, endMarker, includeMarkers
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if (match[0] === '\\[') {
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type = 'display_math'
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endMarker = '\\\\]'
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} else if (match[0] === '\\(') {
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type = 'inline_math'
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endMarker = '\\\\)'
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} else if (match[1]) {
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type = 'math'
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endMarker = '\\end{' + match[1] + '}'
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includeMarkers = true
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}
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var endMarkerPos = state.src.indexOf(endMarker, startMathPos)
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if (endMarkerPos === -1) {
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return false
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}
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var nextPos = endMarkerPos + endMarker.length
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if (!silent) {
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var token = state.push(type + '_open', 'span', 1);
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token.attrs = [ ['class', 'mathjax raw'] ];
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token = state.push(type, '', 0);
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token.content = includeMarkers ?
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state.src.slice(state.pos, nextPos) : state.src.slice(startMathPos, endMarkerPos)
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token = state.push(type + '_close', 'span', -1);
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}
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state.pos = nextPos
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return true
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}
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function texMath(state, silent) {
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if (state.md.meta.mathjax === false) {
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return false
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}
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var startMathPos = state.pos
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if (state.src.charCodeAt(startMathPos) !== 0x24 /* $ */) {
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return false
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}
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// Parse tex math according to http://pandoc.org/README.html#math
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var endMarker = '$'
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var afterStartMarker = state.src.charCodeAt(++startMathPos)
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if (afterStartMarker === 0x24 /* $ */) {
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endMarker = '$$'
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if (state.src.charCodeAt(++startMathPos) === 0x24 /* $ */) {
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// 3 markers are too much
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return false
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}
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} else {
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// Skip if opening $ is succeeded by a space character
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if (afterStartMarker === 0x20 /* space */ || afterStartMarker === 0x09 /* \t */ || afterStartMarker === 0x0a /* \n */) {
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return false
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}
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}
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var endMarkerPos = state.src.indexOf(endMarker, startMathPos)
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if (endMarkerPos === -1) {
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return false
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}
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if (state.src.charCodeAt(endMarkerPos - 1) === 0x5C /* \ */) {
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return false
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}
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var nextPos = endMarkerPos + endMarker.length
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if (endMarker.length === 1) {
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// Skip if $ is preceded by a space character
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var beforeEndMarker = state.src.charCodeAt(endMarkerPos - 1)
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if (beforeEndMarker === 0x20 /* space */ || beforeEndMarker === 0x09 /* \t */ || beforeEndMarker === 0x0a /* \n */) {
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return false
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}
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// Skip if closing $ is succeeded by a digit (eg $5 $10 ...)
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var suffix = state.src.charCodeAt(nextPos)
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if (suffix >= 0x30 && suffix < 0x3A) {
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return false
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}
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}
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if (!silent) {
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var type = endMarker.length === 1 ? 'inline_math' : 'display_math';
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var token = state.push(type + '_open', 'span', 1)
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token.attrs = [ ['class', 'mathjax raw'] ]
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token = state.push(type, '', 0);
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token.content = state.src.slice(startMathPos, endMarkerPos);
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token = state.push(type + '_close', 'span', -1);
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}
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state.pos = nextPos
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return true
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}
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function escapeHtml(html) {
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return html.replace(/&/g, '&').replace(/</g, '<').replace(/\u00a0/g, ' ')
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}
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return function(md) {
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md.inline.ruler.before('escape', 'math', math)
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md.inline.ruler.push('texMath', texMath)
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md.renderer.rules.math = function(tokens, idx) {
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return escapeHtml(tokens[idx].content)
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}
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md.renderer.rules.inline_math = function(tokens, idx) {
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return '\\(' + escapeHtml(tokens[idx].content) + '\\)'
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}
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md.renderer.rules.display_math = function(tokens, idx) {
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return '\\[' + escapeHtml(tokens[idx].content) + '\\]'
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}
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}
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})
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