60 lines
1.5 KiB
JavaScript
60 lines
1.5 KiB
JavaScript
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'use strict';
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// Process ~subscript~
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// same as UNESCAPE_MD_RE plus a space
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const UNESCAPE_RE = /\\([ \\!"#$%&'()*+,./:;<=>?@[\]^_`{|}~-])/g;
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function subscript(state, silent) {
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const max = state.posMax;
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const start = state.pos;
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if (state.src.charCodeAt(start) !== 0x7E /* ~ */) {
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return false;
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}
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if (silent) {
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return false;
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} // don't run any pairs in validation mode
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if (start + 2 >= max) {
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return false;
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}
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state.pos = start + 1;
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let found = false;
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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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const 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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const token_so = state.push('sub_open', 'sub', 1);
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token_so.markup = '~';
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const token_t = state.push('text', '', 0);
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token_t.content = content.replace(UNESCAPE_RE, '$1');
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const token_sc = state.push('sub_close', 'sub', -1);
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token_sc.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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function sub_plugin(md) {
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md.inline.ruler.after('emphasis', 'sub', subscript);
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}
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module.exports = sub_plugin;
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