87 lines
1.7 KiB
JavaScript
87 lines
1.7 KiB
JavaScript
'use strict'
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var trim = require('trim')
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var word = require('is-word-character')
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var whitespace = require('is-whitespace-character')
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var locate = require('../locate/emphasis')
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module.exports = emphasis
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emphasis.locator = locate
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var asterisk = '*'
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var underscore = '_'
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var backslash = '\\'
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function emphasis(eat, value, silent) {
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var self = this
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var index = 0
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var character = value.charAt(index)
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var now
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var pedantic
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var marker
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var queue
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var subvalue
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var length
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var previous
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if (character !== asterisk && character !== underscore) {
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return
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}
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pedantic = self.options.pedantic
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subvalue = character
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marker = character
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length = value.length
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index++
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queue = ''
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character = ''
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if (pedantic && whitespace(value.charAt(index))) {
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return
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}
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while (index < length) {
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previous = character
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character = value.charAt(index)
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if (character === marker && (!pedantic || !whitespace(previous))) {
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character = value.charAt(++index)
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if (character !== marker) {
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if (!trim(queue) || previous === marker) {
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return
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}
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if (!pedantic && marker === underscore && word(character)) {
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queue += marker
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continue
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}
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/* istanbul ignore if - never used (yet) */
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if (silent) {
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return true
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}
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now = eat.now()
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now.column++
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now.offset++
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return eat(subvalue + queue + marker)({
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type: 'emphasis',
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children: self.tokenizeInline(queue, now)
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})
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}
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queue += marker
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}
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if (!pedantic && character === backslash) {
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queue += character
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character = value.charAt(++index)
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}
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queue += character
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index++
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}
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}
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