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/**
* @author Titus Wormer
* @copyright 2015 Titus Wormer
* @license MIT
* @module remark:parse:tokenize:thematic-break
* @fileoverview Tokenise a thematic break.
*/
'use strict';
module.exports = thematicBreak;
var C_NEWLINE = '\n';
var C_TAB = '\t';
var C_SPACE = ' ';
var C_ASTERISK = '*';
var C_UNDERSCORE = '_';
var C_DASH = '-';
var THEMATIC_BREAK_MARKER_COUNT = 3;
/* Tokenise a thematic break. */
function thematicBreak(eat, value, silent) {
var index = -1;
var length = value.length + 1;
var subvalue = '';
var character;
var marker;
var markerCount;
var queue;
while (++index < length) {
character = value.charAt(index);
if (character !== C_TAB && character !== C_SPACE) {
break;
}
subvalue += character;
}
if (
character !== C_ASTERISK &&
character !== C_DASH &&
character !== C_UNDERSCORE
) {
return;
}
marker = character;
subvalue += character;
markerCount = 1;
queue = '';
while (++index < length) {
character = value.charAt(index);
if (character === marker) {
markerCount++;
subvalue += queue + marker;
queue = '';
} else if (character === C_SPACE) {
queue += character;
} else if (
markerCount >= THEMATIC_BREAK_MARKER_COUNT &&
(!character || character === C_NEWLINE)
) {
subvalue += queue;
if (silent) {
return true;
}
return eat(subvalue)({type: 'thematicBreak'});
} else {
return;
}
}
}
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