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/**
* @author Titus Wormer
* @copyright 2015 Titus Wormer
* @license MIT
* @module remark:parse:tokenize:html-block
* @fileoverview Tokenise block HTML.
*/
'use strict';
var openCloseTag = require('../util/html').openCloseTag;
module.exports = blockHTML;
var C_TAB = '\t';
var C_SPACE = ' ';
var C_NEWLINE = '\n';
var C_LT = '<';
/* Tokenise block HTML. */
function blockHTML(eat, value, silent) {
var self = this;
var blocks = self.options.blocks;
var length = value.length;
var index = 0;
var next;
var line;
var offset;
var character;
var count;
var sequence;
var subvalue;
var sequences = [
[/^<(script|pre|style)(?=(\s|>|$))/i, /<\/(script|pre|style)>/i, true],
[/^<!--/, /-->/, true],
[/^<\?/, /\?>/, true],
[/^<![A-Za-z]/, />/, true],
[/^<!\[CDATA\[/, /\]\]>/, true],
[new RegExp('^</?(' + blocks.join('|') + ')(?=(\\s|/?>|$))', 'i'), /^$/, true],
[new RegExp(openCloseTag.source + '\\s*$'), /^$/, false]
];
/* Eat initial spacing. */
while (index < length) {
character = value.charAt(index);
if (character !== C_TAB && character !== C_SPACE) {
break;
}
index++;
}
if (value.charAt(index) !== C_LT) {
return;
}
next = value.indexOf(C_NEWLINE, index + 1);
next = next === -1 ? length : next;
line = value.slice(index, next);
offset = -1;
count = sequences.length;
while (++offset < count) {
if (sequences[offset][0].test(line)) {
sequence = sequences[offset];
break;
}
}
if (!sequence) {
return;
}
if (silent) {
return sequence[2];
}
index = next;
if (!sequence[1].test(line)) {
while (index < length) {
next = value.indexOf(C_NEWLINE, index + 1);
next = next === -1 ? length : next;
line = value.slice(index + 1, next);
if (sequence[1].test(line)) {
if (line) {
index = next;
}
break;
}
index = next;
}
}
subvalue = value.slice(0, index);
return eat(subvalue)({type: 'html', value: subvalue});
}
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