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/**
* @author Titus Wormer
* @copyright 2015 Titus Wormer
* @license MIT
* @module remark:parse:tokenize:strong
* @fileoverview Tokenise strong.
*/
'use strict';
var trim = require('trim');
var whitespace = require('is-whitespace-character');
var locate = require('../locate/strong');
module.exports = strong;
strong.locator = locate;
var C_ASTERISK = '*';
var C_UNDERSCORE = '_';
/* Tokenise strong. */
function strong(eat, value, silent) {
var self = this;
var index = 0;
var character = value.charAt(index);
var now;
var pedantic;
var marker;
var queue;
var subvalue;
var length;
var prev;
if (
(character !== C_ASTERISK && character !== C_UNDERSCORE) ||
value.charAt(++index) !== character
) {
return;
}
pedantic = self.options.pedantic;
marker = character;
subvalue = marker + marker;
length = value.length;
index++;
queue = '';
character = '';
if (pedantic && whitespace(value.charAt(index))) {
return;
}
while (index < length) {
prev = character;
character = value.charAt(index);
if (
character === marker &&
value.charAt(index + 1) === marker &&
(!pedantic || !whitespace(prev))
) {
character = value.charAt(index + 2);
if (character !== marker) {
if (!trim(queue)) {
return;
}
/* istanbul ignore if - never used (yet) */
if (silent) {
return true;
}
now = eat.now();
now.column += 2;
now.offset += 2;
return eat(subvalue + queue + subvalue)({
type: 'strong',
children: self.tokenizeInline(queue, now)
});
}
}
if (!pedantic && character === '\\') {
queue += character;
character = value.charAt(++index);
}
queue += character;
index++;
}
}
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