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/**
* @author Titus Wormer
* @copyright 2015 Titus Wormer
* @license MIT
* @module remark:parse:tokenize:heading-setext
* @fileoverview Tokenise an setext-style heading.
*/
'use strict';
module.exports = setextHeading;
var C_NEWLINE = '\n';
var C_TAB = '\t';
var C_SPACE = ' ';
var C_EQUALS = '=';
var C_DASH = '-';
var MAX_HEADING_INDENT = 3;
/* Map of characters which can be used to mark setext
* headers, mapping to their corresponding depth. */
var SETEXT_MARKERS = {};
SETEXT_MARKERS[C_EQUALS] = 1;
SETEXT_MARKERS[C_DASH] = 2;
/* Tokenise an setext-style heading. */
function setextHeading(eat, value, silent) {
var self = this;
var now = eat.now();
var length = value.length;
var index = -1;
var subvalue = '';
var content;
var queue;
var character;
var marker;
var depth;
/* Eat initial indentation. */
while (++index < length) {
character = value.charAt(index);
if (character !== C_SPACE || index >= MAX_HEADING_INDENT) {
index--;
break;
}
subvalue += character;
}
/* Eat content. */
content = '';
queue = '';
while (++index < length) {
character = value.charAt(index);
if (character === C_NEWLINE) {
index--;
break;
}
if (character === C_SPACE || character === C_TAB) {
queue += character;
} else {
content += queue + character;
queue = '';
}
}
now.column += subvalue.length;
now.offset += subvalue.length;
subvalue += content + queue;
/* Ensure the content is followed by a newline and a
* valid marker. */
character = value.charAt(++index);
marker = value.charAt(++index);
if (character !== C_NEWLINE || !SETEXT_MARKERS[marker]) {
return;
}
subvalue += character;
/* Eat Setext-line. */
queue = marker;
depth = SETEXT_MARKERS[marker];
while (++index < length) {
character = value.charAt(index);
if (character !== marker) {
if (character !== C_NEWLINE) {
return;
}
index--;
break;
}
queue += character;
}
if (silent) {
return true;
}
return eat(subvalue + queue)({
type: 'heading',
depth: depth,
children: self.tokenizeInline(content, now)
});
}
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