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Diffstat (limited to '')
| -rw-r--r-- | public/vendor/markdown-it-mathjax.js | 120 |
1 files changed, 120 insertions, 0 deletions
diff --git a/public/vendor/markdown-it-mathjax.js b/public/vendor/markdown-it-mathjax.js new file mode 100644 index 00000000..01c6fa43 --- /dev/null +++ b/public/vendor/markdown-it-mathjax.js @@ -0,0 +1,120 @@ +// modified from https://github.com/classeur/markdown-it-mathjax + +(function(root, factory) { + if (typeof exports === 'object') { + module.exports = factory() + } else { + root.markdownitMathjax = factory() + } +})(this, function() { + function math(state, silent) { + var startMathPos = state.pos + if (state.src.charCodeAt(startMathPos) !== 0x5C /* \ */) { + return false + } + var match = state.src.slice(++startMathPos).match(/^(?:\\\[|\\\(|begin\{([^}]*)\})/) + if (!match) { + return false + } + startMathPos += match[0].length + var type, endMarker, includeMarkers + if (match[0] === '\\[') { + type = 'display_math' + endMarker = '\\\\]' + } else if (match[0] === '\\(') { + type = 'inline_math' + endMarker = '\\\\)' + } else if (match[1]) { + type = 'math' + endMarker = '\\end{' + match[1] + '}' + includeMarkers = true + } + var endMarkerPos = state.src.indexOf(endMarker, startMathPos) + if (endMarkerPos === -1) { + return false + } + var nextPos = endMarkerPos + endMarker.length + if (!silent) { + var token = state.push(type + '_open', 'span', 1); + token.attrs = [ ['class', 'mathjax raw'] ]; + token = state.push(type, '', 0); + token.content = includeMarkers ? + state.src.slice(state.pos, nextPos) : state.src.slice(startMathPos, endMarkerPos) + token = state.push(type + '_close', 'span', -1); + } + state.pos = nextPos + return true + } + + function texMath(state, silent) { + var startMathPos = state.pos + if (state.src.charCodeAt(startMathPos) !== 0x24 /* $ */) { + return false + } + + // Parse tex math according to http://pandoc.org/README.html#math + var endMarker = '$' + var afterStartMarker = state.src.charCodeAt(++startMathPos) + if (afterStartMarker === 0x24 /* $ */) { + endMarker = '$$' + if (state.src.charCodeAt(++startMathPos) === 0x24 /* $ */) { + // 3 markers are too much + return false + } + } else { + // Skip if opening $ is succeeded by a space character + if (afterStartMarker === 0x20 /* space */ || afterStartMarker === 0x09 /* \t */ || afterStartMarker === 0x0a /* \n */) { + return false + } + } + var endMarkerPos = state.src.indexOf(endMarker, startMathPos) + if (endMarkerPos === -1) { + return false + } + if (state.src.charCodeAt(endMarkerPos - 1) === 0x5C /* \ */) { + return false + } + var nextPos = endMarkerPos + endMarker.length + if (endMarker.length === 1) { + // Skip if $ is preceded by a space character + var beforeEndMarker = state.src.charCodeAt(endMarkerPos - 1) + if (beforeEndMarker === 0x20 /* space */ || beforeEndMarker === 0x09 /* \t */ || beforeEndMarker === 0x0a /* \n */) { + return false + } + // Skip if closing $ is succeeded by a digit (eg $5 $10 ...) + var suffix = state.src.charCodeAt(nextPos) + if (suffix >= 0x30 && suffix < 0x3A) { + return false + } + } + + if (!silent) { + var type = endMarker.length === 1 ? 'inline_math' : 'display_math'; + var token = state.push(type + '_open', 'span', 1) + token.attrs = [ ['class', 'mathjax raw'] ] + token = state.push(type, '', 0); + token.content = state.src.slice(startMathPos, endMarkerPos); + token = state.push(type + '_close', 'span', -1); + } + state.pos = nextPos + return true + } + + function escapeHtml(html) { + return html.replace(/&/g, '&').replace(/</g, '<').replace(/\u00a0/g, ' ') + } + + return function(md) { + md.inline.ruler.before('escape', 'math', math) + md.inline.ruler.push('texMath', texMath) + md.renderer.rules.math = function(tokens, idx) { + return escapeHtml(tokens[idx].content) + } + md.renderer.rules.inline_math = function(tokens, idx) { + return '\\(' + escapeHtml(tokens[idx].content) + '\\)' + } + md.renderer.rules.display_math = function(tokens, idx) { + return '\\[' + escapeHtml(tokens[idx].content) + '\\]' + } + } +}) |