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121 lines
2.8 KiB
121 lines
2.8 KiB
'use strict';
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module.exports = function ins_plugin(md) {
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// Insert each marker as a separate text token, and add it to delimiter list
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//
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function tokenize(state, silent) {
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var i, scanned, token, len, ch,
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start = state.pos,
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marker = state.src.charCodeAt(start);
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if (silent) { return false; }
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if (marker !== 0x3D/* = */) { return false; }
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scanned = state.scanDelims(state.pos, true);
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len = scanned.length;
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ch = String.fromCharCode(marker);
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if (len < 2) { return false; }
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if (len % 2) {
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token = state.push('text', '', 0);
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token.content = ch;
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len--;
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}
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for (i = 0; i < len; i += 2) {
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token = state.push('text', '', 0);
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token.content = ch + ch;
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state.delimiters.push({
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marker: marker,
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jump: i,
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token: state.tokens.length - 1,
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level: state.level,
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end: -1,
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open: scanned.can_open,
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close: scanned.can_close
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});
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}
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state.pos += scanned.length;
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return true;
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}
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// Walk through delimiter list and replace text tokens with tags
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//
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function postProcess(state) {
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var i, j,
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startDelim,
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endDelim,
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token,
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loneMarkers = [],
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delimiters = state.delimiters,
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max = state.delimiters.length;
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for (i = 0; i < max; i++) {
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startDelim = delimiters[i];
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if (startDelim.marker !== 0x3D/* = */) {
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continue;
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}
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if (startDelim.end === -1) {
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continue;
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}
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endDelim = delimiters[startDelim.end];
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token = state.tokens[startDelim.token];
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token.type = 'mark_open';
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token.tag = 'mark';
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token.nesting = 1;
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token.markup = '==';
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token.content = '';
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token = state.tokens[endDelim.token];
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token.type = 'mark_close';
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token.tag = 'mark';
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token.nesting = -1;
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token.markup = '==';
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token.content = '';
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if (state.tokens[endDelim.token - 1].type === 'text' &&
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state.tokens[endDelim.token - 1].content === '=') {
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loneMarkers.push(endDelim.token - 1);
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}
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}
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// If a marker sequence has an odd number of characters, it's splitted
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// like this: `~~~~~` -> `~` + `~~` + `~~`, leaving one marker at the
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// start of the sequence.
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//
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// So, we have to move all those markers after subsequent s_close tags.
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//
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while (loneMarkers.length) {
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i = loneMarkers.pop();
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j = i + 1;
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while (j < state.tokens.length && state.tokens[j].type === 'mark_close') {
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j++;
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}
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j--;
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if (i !== j) {
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token = state.tokens[j];
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state.tokens[j] = state.tokens[i];
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state.tokens[i] = token;
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}
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}
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}
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md.inline.ruler.before('emphasis', 'mark', tokenize);
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md.inline.ruler2.before('emphasis', 'mark', postProcess);
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};
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