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128 lines
3.5 KiB
JavaScript
128 lines
3.5 KiB
JavaScript
// Process *this* and _that_
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//
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'use strict';
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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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module.exports.tokenize = function emphasis(state, silent) {
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var i, scanned, token,
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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 !== 0x5F /* _ */ && marker !== 0x2A /* * */) { return false; }
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scanned = state.scanDelims(state.pos, marker === 0x2A);
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for (i = 0; i < scanned.length; i++) {
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token = state.push('text', '', 0);
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token.content = String.fromCharCode(marker);
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state.delimiters.push({
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// Char code of the starting marker (number).
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//
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marker: marker,
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// Total length of these series of delimiters.
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//
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length: scanned.length,
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// An amount of characters before this one that's equivalent to
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// current one. In plain English: if this delimiter does not open
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// an emphasis, neither do previous `jump` characters.
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//
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// Used to skip sequences like "*****" in one step, for 1st asterisk
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// value will be 0, for 2nd it's 1 and so on.
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//
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jump: i,
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// A position of the token this delimiter corresponds to.
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//
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token: state.tokens.length - 1,
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// Token level.
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//
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level: state.level,
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// If this delimiter is matched as a valid opener, `end` will be
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// equal to its position, otherwise it's `-1`.
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//
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end: -1,
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// Boolean flags that determine if this delimiter could open or close
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// an emphasis.
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//
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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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module.exports.postProcess = function emphasis(state) {
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var i,
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startDelim,
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endDelim,
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token,
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ch,
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isStrong,
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delimiters = state.delimiters,
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max = state.delimiters.length;
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for (i = max - 1; i >= 0; i--) {
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startDelim = delimiters[i];
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if (startDelim.marker !== 0x5F/* _ */ && startDelim.marker !== 0x2A/* * */) {
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continue;
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}
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// Process only opening markers
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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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// If the previous delimiter has the same marker and is adjacent to this one,
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// merge those into one strong delimiter.
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//
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// `<em><em>whatever</em></em>` -> `<strong>whatever</strong>`
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//
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isStrong = i > 0 &&
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delimiters[i - 1].end === startDelim.end + 1 &&
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delimiters[i - 1].token === startDelim.token - 1 &&
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delimiters[startDelim.end + 1].token === endDelim.token + 1 &&
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delimiters[i - 1].marker === startDelim.marker;
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ch = String.fromCharCode(startDelim.marker);
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token = state.tokens[startDelim.token];
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token.type = isStrong ? 'strong_open' : 'em_open';
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token.tag = isStrong ? 'strong' : 'em';
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token.nesting = 1;
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token.markup = isStrong ? ch + ch : ch;
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token.content = '';
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token = state.tokens[endDelim.token];
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token.type = isStrong ? 'strong_close' : 'em_close';
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token.tag = isStrong ? 'strong' : 'em';
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token.nesting = -1;
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token.markup = isStrong ? ch + ch : ch;
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token.content = '';
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if (isStrong) {
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state.tokens[delimiters[i - 1].token].content = '';
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state.tokens[delimiters[startDelim.end + 1].token].content = '';
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i--;
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}
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}
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};
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