141 lines
3.9 KiB
JavaScript
141 lines
3.9 KiB
JavaScript
// Test if potential opening or closing delimieter
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// Assumes that there is a "$" at state.src[pos]
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function isValidDelim (state, pos) {
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let prevChar
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let nextChar
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let max = state.posMax
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let canOpen = true
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let canClose = true
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prevChar = pos > 0 ? state.src.charCodeAt(pos - 1) : -1
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nextChar = pos + 1 <= max ? state.src.charCodeAt(pos + 1) : -1
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// Check non-whitespace conditions for opening and closing, and
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// check that closing delimeter isn't followed by a number
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if (prevChar === 0x20/* " " */ || prevChar === 0x09/* \t */ ||
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(nextChar >= 0x30/* "0" */ && nextChar <= 0x39/* "9" */)) {
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canClose = false
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}
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if (nextChar === 0x20/* " " */ || nextChar === 0x09/* \t */) {
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canOpen = false
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}
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return {
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canOpen: canOpen,
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canClose: canClose
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}
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}
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export default {
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katexInline (state, silent) {
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let start, match, token, res, pos
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if (state.src[state.pos] !== '$') { return false }
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res = isValidDelim(state, state.pos)
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if (!res.canOpen) {
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if (!silent) { state.pending += '$' }
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state.pos += 1
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return true
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}
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// First check for and bypass all properly escaped delimieters
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// This loop will assume that the first leading backtick can not
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// be the first character in state.src, which is known since
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// we have found an opening delimieter already.
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start = state.pos + 1
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match = start
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while ((match = state.src.indexOf('$', match)) !== -1) {
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// Found potential $, look for escapes, pos will point to
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// first non escape when complete
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pos = match - 1
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while (state.src[pos] === '\\') { pos -= 1 }
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// Even number of escapes, potential closing delimiter found
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if (((match - pos) % 2) === 1) { break }
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match += 1
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}
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// No closing delimter found. Consume $ and continue.
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if (match === -1) {
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if (!silent) { state.pending += '$' }
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state.pos = start
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return true
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}
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// Check if we have empty content, ie: $$. Do not parse.
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if (match - start === 0) {
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if (!silent) { state.pending += '$$' }
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state.pos = start + 1
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return true
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}
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// Check for valid closing delimiter
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res = isValidDelim(state, match)
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if (!res.canClose) {
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if (!silent) { state.pending += '$' }
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state.pos = start
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return true
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}
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if (!silent) {
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token = state.push('katex_inline', 'math', 0)
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token.markup = '$'
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token.content = state.src.slice(start, match)
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}
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state.pos = match + 1
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return true
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},
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katexBlock (state, start, end, silent) {
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let firstLine; let lastLine; let next; let lastPos; let found = false; let token
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let pos = state.bMarks[start] + state.tShift[start]
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let max = state.eMarks[start]
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if (pos + 2 > max) { return false }
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if (state.src.slice(pos, pos + 2) !== '$$') { return false }
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pos += 2
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firstLine = state.src.slice(pos, max)
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if (silent) { return true }
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if (firstLine.trim().slice(-2) === '$$') {
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// Single line expression
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firstLine = firstLine.trim().slice(0, -2)
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found = true
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}
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for (next = start; !found;) {
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next++
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if (next >= end) { break }
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pos = state.bMarks[next] + state.tShift[next]
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max = state.eMarks[next]
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if (pos < max && state.tShift[next] < state.blkIndent) {
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// non-empty line with negative indent should stop the list:
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break
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}
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if (state.src.slice(pos, max).trim().slice(-2) === '$$') {
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lastPos = state.src.slice(0, max).lastIndexOf('$$')
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lastLine = state.src.slice(pos, lastPos)
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found = true
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}
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}
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state.line = next + 1
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token = state.push('katex_block', 'math', 0)
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token.block = true
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token.content = (firstLine && firstLine.trim() ? firstLine + '\n' : '') +
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state.getLines(start + 1, next, state.tShift[start], true) +
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(lastLine && lastLine.trim() ? lastLine : '')
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token.map = [ start, state.line ]
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token.markup = '$$'
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return true
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}
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}
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