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/**
* @author Titus Wormer
* @copyright 2015 Titus Wormer
* @license MIT
* @module remark:parse:tokenize:auto-link
* @fileoverview Tokenise an auto-link.
*/
'use strict';
var decode = require('parse-entities');
var locate = require('../locate/tag');
module.exports = autoLink;
autoLink.locator = locate;
autoLink.notInLink = true;
var C_LT = '<';
var C_GT = '>';
var C_AT_SIGN = '@';
var C_SLASH = '/';
var MAILTO = 'mailto:';
var MAILTO_LENGTH = MAILTO.length;
/* Tokenise a link. */
function autoLink(eat, value, silent) {
var self;
var subvalue;
var length;
var index;
var queue;
var character;
var hasAtCharacter;
var link;
var now;
var content;
var tokenize;
var exit;
if (value.charAt(0) !== C_LT) {
return;
}
self = this;
subvalue = '';
length = value.length;
index = 0;
queue = '';
hasAtCharacter = false;
link = '';
index++;
subvalue = C_LT;
while (index < length) {
character = value.charAt(index);
if (
character === ' ' ||
character === C_GT ||
character === C_AT_SIGN ||
(character === ':' && value.charAt(index + 1) === C_SLASH)
) {
break;
}
queue += character;
index++;
}
if (!queue) {
return;
}
link += queue;
queue = '';
character = value.charAt(index);
link += character;
index++;
if (character === C_AT_SIGN) {
hasAtCharacter = true;
} else {
if (
character !== ':' ||
value.charAt(index + 1) !== C_SLASH
) {
return;
}
link += C_SLASH;
index++;
}
while (index < length) {
character = value.charAt(index);
if (character === ' ' || character === C_GT) {
break;
}
queue += character;
index++;
}
character = value.charAt(index);
if (!queue || character !== C_GT) {
return;
}
/* istanbul ignore if - never used (yet) */
if (silent) {
return true;
}
link += queue;
content = link;
subvalue += link + character;
now = eat.now();
now.column++;
now.offset++;
if (hasAtCharacter) {
if (link.slice(0, MAILTO_LENGTH).toLowerCase() === MAILTO) {
content = content.substr(MAILTO_LENGTH);
now.column += MAILTO_LENGTH;
now.offset += MAILTO_LENGTH;
} else {
link = MAILTO + link;
}
}
/* Temporarily remove support for escapes in autolinks. */
tokenize = self.inlineTokenizers.escape;
self.inlineTokenizers.escape = null;
exit = self.enterLink();
content = self.tokenizeInline(content, now);
self.inlineTokenizers.escape = tokenize;
exit();
return eat(subvalue)({
type: 'link',
title: null,
url: decode(link),
children: content
});
}
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