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// Convert straight quotation marks to typographic ones
//
import { isWhiteSpace, isPunctChar, isMdAsciiPunct } from '../common/utils.mjs'
const QUOTE_TEST_RE = /['"]/
const QUOTE_RE = /['"]/g
const APOSTROPHE = '\u2019' /* ’ */
function replaceAt (str, index, ch) {
return str.slice(0, index) + ch + str.slice(index + 1)
}
function process_inlines (tokens, state) {
let j
const stack = []
for (let i = 0; i < tokens.length; i++) {
const token = tokens[i]
const thisLevel = tokens[i].level
for (j = stack.length - 1; j >= 0; j--) {
if (stack[j].level <= thisLevel) { break }
}
stack.length = j + 1
if (token.type !== 'text') { continue }
let text = token.content
let pos = 0
let max = text.length
/* eslint no-labels:0,block-scoped-var:0 */
OUTER:
while (pos < max) {
QUOTE_RE.lastIndex = pos
const t = QUOTE_RE.exec(text)
if (!t) { break }
let canOpen = true
let canClose = true
pos = t.index + 1
const isSingle = (t[0] === "'")
// Find previous character,
// default to space if it's the beginning of the line
//
let lastChar = 0x20
if (t.index - 1 >= 0) {
lastChar = text.charCodeAt(t.index - 1)
} else {
for (j = i - 1; j >= 0; j--) {
if (tokens[j].type === 'softbreak' || tokens[j].type === 'hardbreak') break // lastChar defaults to 0x20
if (!tokens[j].content) continue // should skip all tokens except 'text', 'html_inline' or 'code_inline'
lastChar = tokens[j].content.charCodeAt(tokens[j].content.length - 1)
break
}
}
// Find next character,
// default to space if it's the end of the line
//
let nextChar = 0x20
if (pos < max) {
nextChar = text.charCodeAt(pos)
} else {
for (j = i + 1; j < tokens.length; j++) {
if (tokens[j].type === 'softbreak' || tokens[j].type === 'hardbreak') break // nextChar defaults to 0x20
if (!tokens[j].content) continue // should skip all tokens except 'text', 'html_inline' or 'code_inline'
nextChar = tokens[j].content.charCodeAt(0)
break
}
}
const isLastPunctChar = isMdAsciiPunct(lastChar) || isPunctChar(String.fromCharCode(lastChar))
const isNextPunctChar = isMdAsciiPunct(nextChar) || isPunctChar(String.fromCharCode(nextChar))
const isLastWhiteSpace = isWhiteSpace(lastChar)
const isNextWhiteSpace = isWhiteSpace(nextChar)
if (isNextWhiteSpace) {
canOpen = false
} else if (isNextPunctChar) {
if (!(isLastWhiteSpace || isLastPunctChar)) {
canOpen = false
}
}
if (isLastWhiteSpace) {
canClose = false
} else if (isLastPunctChar) {
if (!(isNextWhiteSpace || isNextPunctChar)) {
canClose = false
}
}
if (nextChar === 0x22 /* " */ && t[0] === '"') {
if (lastChar >= 0x30 /* 0 */ && lastChar <= 0x39 /* 9 */) {
// special case: 1"" - count first quote as an inch
canClose = canOpen = false
}
}
if (canOpen && canClose) {
// Replace quotes in the middle of punctuation sequence, but not
// in the middle of the words, i.e.:
//
// 1. foo " bar " baz - not replaced
// 2. foo-"-bar-"-baz - replaced
// 3. foo"bar"baz - not replaced
//
canOpen = isLastPunctChar
canClose = isNextPunctChar
}
if (!canOpen && !canClose) {
// middle of word
if (isSingle) {
token.content = replaceAt(token.content, t.index, APOSTROPHE)
}
continue
}
if (canClose) {
// this could be a closing quote, rewind the stack to get a match
for (j = stack.length - 1; j >= 0; j--) {
let item = stack[j]
if (stack[j].level < thisLevel) { break }
if (item.single === isSingle && stack[j].level === thisLevel) {
item = stack[j]
let openQuote
let closeQuote
if (isSingle) {
openQuote = state.md.options.quotes[2]
closeQuote = state.md.options.quotes[3]
} else {
openQuote = state.md.options.quotes[0]
closeQuote = state.md.options.quotes[1]
}
// replace token.content *before* tokens[item.token].content,
// because, if they are pointing at the same token, replaceAt
// could mess up indices when quote length != 1
token.content = replaceAt(token.content, t.index, closeQuote)
tokens[item.token].content = replaceAt(
tokens[item.token].content, item.pos, openQuote)
pos += closeQuote.length - 1
if (item.token === i) { pos += openQuote.length - 1 }
text = token.content
max = text.length
stack.length = j
continue OUTER
}
}
}
if (canOpen) {
stack.push({
token: i,
pos: t.index,
single: isSingle,
level: thisLevel
})
} else if (canClose && isSingle) {
token.content = replaceAt(token.content, t.index, APOSTROPHE)
}
}
}
}
export default function smartquotes (state) {
/* eslint max-depth:0 */
if (!state.md.options.typographer) { return }
for (let blkIdx = state.tokens.length - 1; blkIdx >= 0; blkIdx--) {
if (state.tokens[blkIdx].type !== 'inline' ||
!QUOTE_TEST_RE.test(state.tokens[blkIdx].content)) {
continue
}
process_inlines(state.tokens[blkIdx].children, state)
}
}
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