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