78 lines
2.1 KiB
JavaScript
78 lines
2.1 KiB
JavaScript
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/**
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* @typedef {import('mdast').InlineCode} InlineCode
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* @typedef {import('mdast').Parents} Parents
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* @typedef {import('../types.js').State} State
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*/
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inlineCode.peek = inlineCodePeek
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/**
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* @param {InlineCode} node
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* @param {Parents | undefined} _
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* @param {State} state
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* @returns {string}
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*/
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export function inlineCode(node, _, state) {
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let value = node.value || ''
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let sequence = '`'
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let index = -1
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// If there is a single grave accent on its own in the code, use a fence of
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// two.
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// If there are two in a row, use one.
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while (new RegExp('(^|[^`])' + sequence + '([^`]|$)').test(value)) {
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sequence += '`'
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}
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// If this is not just spaces or eols (tabs don’t count), and either the
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// first or last character are a space, eol, or tick, then pad with spaces.
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if (
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/[^ \r\n]/.test(value) &&
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((/^[ \r\n]/.test(value) && /[ \r\n]$/.test(value)) || /^`|`$/.test(value))
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) {
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value = ' ' + value + ' '
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}
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// We have a potential problem: certain characters after eols could result in
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// blocks being seen.
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// For example, if someone injected the string `'\n# b'`, then that would
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// result in an ATX heading.
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// We can’t escape characters in `inlineCode`, but because eols are
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// transformed to spaces when going from markdown to HTML anyway, we can swap
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// them out.
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while (++index < state.unsafe.length) {
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const pattern = state.unsafe[index]
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const expression = state.compilePattern(pattern)
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/** @type {RegExpExecArray | null} */
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let match
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// Only look for `atBreak`s.
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// Btw: note that `atBreak` patterns will always start the regex at LF or
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// CR.
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if (!pattern.atBreak) continue
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while ((match = expression.exec(value))) {
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let position = match.index
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// Support CRLF (patterns only look for one of the characters).
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if (
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value.charCodeAt(position) === 10 /* `\n` */ &&
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value.charCodeAt(position - 1) === 13 /* `\r` */
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) {
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position--
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}
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value = value.slice(0, position) + ' ' + value.slice(match.index + 1)
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}
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}
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return sequence + value + sequence
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}
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/**
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* @returns {string}
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*/
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function inlineCodePeek() {
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return '`'
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}
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