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66 lines
1.5 KiB
66 lines
1.5 KiB
// Process ~subscript~ |
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'use strict'; |
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// same as UNESCAPE_MD_RE plus a space |
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var UNESCAPE_RE = /\\([ \\!"#$%&'()*+,.\/:;<=>?@[\]^_`{|}~-])/g; |
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function subscript(state, silent) { |
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var found, |
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content, |
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token, |
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max = state.posMax, |
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start = state.pos; |
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if (state.src.charCodeAt(start) !== 0x7E/* ~ */) { return false; } |
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if (silent) { return false; } // don't run any pairs in validation mode |
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if (start + 2 >= max) { return false; } |
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state.pos = start + 1; |
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while (state.pos < max) { |
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if (state.src.charCodeAt(state.pos) === 0x7E/* ~ */) { |
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found = true; |
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break; |
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} |
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state.md.inline.skipToken(state); |
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} |
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if (!found || start + 1 === state.pos) { |
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state.pos = start; |
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return false; |
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} |
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content = state.src.slice(start + 1, state.pos); |
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// don't allow unescaped spaces/newlines inside |
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if (content.match(/(^|[^\\])(\\\\)*\s/)) { |
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state.pos = start; |
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return false; |
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} |
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// found! |
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state.posMax = state.pos; |
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state.pos = start + 1; |
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// Earlier we checked !silent, but this implementation does not need it |
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token = state.push('sub_open', 'sub', 1); |
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token.markup = '~'; |
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token = state.push('text', '', 0); |
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token.content = content.replace(UNESCAPE_RE, '$1'); |
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token = state.push('sub_close', 'sub', -1); |
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token.markup = '~'; |
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state.pos = state.posMax + 1; |
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state.posMax = max; |
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return true; |
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} |
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module.exports = function sub_plugin(md) { |
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md.inline.ruler.after('emphasis', 'sub', subscript); |
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};
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