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// Simple typographic replacements
//
// (c) (C) → ©
// (tm) (TM) → ™
// (r) (R) → ®
// +- → ±
// ... → … (also ?.... → ?.., !.... → !..)
// ???????? → ???, !!!!! → !!!, `,,` → `,`
// -- → –, --- → —
//
// TODO:
// - fractionals 1/2, 1/4, 3/4 -> ½, ¼, ¾
// - multiplications 2 x 4 -> 2 × 4
const RARE_RE = /\+-|\.\.|\?\?\?\?|!!!!|,,|--/
// Workaround for phantomjs - need regex without /g flag,
// or root check will fail every second time
const SCOPED_ABBR_TEST_RE = /\((c|tm|r)\)/i
const SCOPED_ABBR_RE = /\((c|tm|r)\)/ig
const SCOPED_ABBR = {
c: '©',
r: '®',
tm: '™'
}
function replaceFn (match, name) {
return SCOPED_ABBR[name.toLowerCase()]
}
function replace_scoped (inlineTokens) {
let inside_autolink = 0
for (let i = inlineTokens.length - 1; i >= 0; i--) {
const token = inlineTokens[i]
if (token.type === 'text' && !inside_autolink) {
token.content = token.content.replace(SCOPED_ABBR_RE, replaceFn)
}
if (token.type === 'link_open' && token.info === 'auto') {
inside_autolink--
}
if (token.type === 'link_close' && token.info === 'auto') {
inside_autolink++
}
}
}
function replace_rare (inlineTokens) {
let inside_autolink = 0
for (let i = inlineTokens.length - 1; i >= 0; i--) {
const token = inlineTokens[i]
if (token.type === 'text' && !inside_autolink) {
if (RARE_RE.test(token.content)) {
token.content = token.content
.replace(/\+-/g, '±')
// .., ..., ....... -> …
// but ?..... & !..... -> ?.. & !..
.replace(/\.{2,}/g, '…').replace(/([?!])…/g, '$1..')
.replace(/([?!]){4,}/g, '$1$1$1').replace(/,{2,}/g, ',')
// em-dash
.replace(/(^|[^-])---(?=[^-]|$)/mg, '$1\u2014')
// en-dash
.replace(/(^|\s)--(?=\s|$)/mg, '$1\u2013')
.replace(/(^|[^-\s])--(?=[^-\s]|$)/mg, '$1\u2013')
}
}
if (token.type === 'link_open' && token.info === 'auto') {
inside_autolink--
}
if (token.type === 'link_close' && token.info === 'auto') {
inside_autolink++
}
}
}
export default function replace (state) {
let blkIdx
if (!state.md.options.typographer) { return }
for (blkIdx = state.tokens.length - 1; blkIdx >= 0; blkIdx--) {
if (state.tokens[blkIdx].type !== 'inline') { continue }
if (SCOPED_ABBR_TEST_RE.test(state.tokens[blkIdx].content)) {
replace_scoped(state.tokens[blkIdx].children)
}
if (RARE_RE.test(state.tokens[blkIdx].content)) {
replace_rare(state.tokens[blkIdx].children)
}
}
}
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