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/**
* @author Titus Wormer
* @copyright 2015 Titus Wormer
* @license MIT
* @module remark:parse:tokenize:definition
* @fileoverview Tokenise a definition.
*/
'use strict';
var whitespace = require('is-whitespace-character');
var normalize = require('../util/normalize');
module.exports = definition;
definition.notInList = true;
definition.notInBlock = true;
var C_DOUBLE_QUOTE = '"';
var C_SINGLE_QUOTE = '\'';
var C_BACKSLASH = '\\';
var C_NEWLINE = '\n';
var C_TAB = '\t';
var C_SPACE = ' ';
var C_BRACKET_OPEN = '[';
var C_BRACKET_CLOSE = ']';
var C_PAREN_OPEN = '(';
var C_PAREN_CLOSE = ')';
var C_COLON = ':';
var C_LT = '<';
var C_GT = '>';
/* Tokenise a definition. */
function definition(eat, value, silent) {
var self = this;
var commonmark = self.options.commonmark;
var index = 0;
var length = value.length;
var subvalue = '';
var beforeURL;
var beforeTitle;
var queue;
var character;
var test;
var identifier;
var url;
var title;
while (index < length) {
character = value.charAt(index);
if (character !== C_SPACE && character !== C_TAB) {
break;
}
subvalue += character;
index++;
}
character = value.charAt(index);
if (character !== C_BRACKET_OPEN) {
return;
}
index++;
subvalue += character;
queue = '';
while (index < length) {
character = value.charAt(index);
if (character === C_BRACKET_CLOSE) {
break;
} else if (character === C_BACKSLASH) {
queue += character;
index++;
character = value.charAt(index);
}
queue += character;
index++;
}
if (
!queue ||
value.charAt(index) !== C_BRACKET_CLOSE ||
value.charAt(index + 1) !== C_COLON
) {
return;
}
identifier = queue;
subvalue += queue + C_BRACKET_CLOSE + C_COLON;
index = subvalue.length;
queue = '';
while (index < length) {
character = value.charAt(index);
if (
character !== C_TAB &&
character !== C_SPACE &&
character !== C_NEWLINE
) {
break;
}
subvalue += character;
index++;
}
character = value.charAt(index);
queue = '';
beforeURL = subvalue;
if (character === C_LT) {
index++;
while (index < length) {
character = value.charAt(index);
if (!isEnclosedURLCharacter(character)) {
break;
}
queue += character;
index++;
}
character = value.charAt(index);
if (character === isEnclosedURLCharacter.delimiter) {
subvalue += C_LT + queue + character;
index++;
} else {
if (commonmark) {
return;
}
index -= queue.length + 1;
queue = '';
}
}
if (!queue) {
while (index < length) {
character = value.charAt(index);
if (!isUnclosedURLCharacter(character)) {
break;
}
queue += character;
index++;
}
subvalue += queue;
}
if (!queue) {
return;
}
url = queue;
queue = '';
while (index < length) {
character = value.charAt(index);
if (
character !== C_TAB &&
character !== C_SPACE &&
character !== C_NEWLINE
) {
break;
}
queue += character;
index++;
}
character = value.charAt(index);
test = null;
if (character === C_DOUBLE_QUOTE) {
test = C_DOUBLE_QUOTE;
} else if (character === C_SINGLE_QUOTE) {
test = C_SINGLE_QUOTE;
} else if (character === C_PAREN_OPEN) {
test = C_PAREN_CLOSE;
}
if (!test) {
queue = '';
index = subvalue.length;
} else if (queue) {
subvalue += queue + character;
index = subvalue.length;
queue = '';
while (index < length) {
character = value.charAt(index);
if (character === test) {
break;
}
if (character === C_NEWLINE) {
index++;
character = value.charAt(index);
if (character === C_NEWLINE || character === test) {
return;
}
queue += C_NEWLINE;
}
queue += character;
index++;
}
character = value.charAt(index);
if (character !== test) {
return;
}
beforeTitle = subvalue;
subvalue += queue + character;
index++;
title = queue;
queue = '';
} else {
return;
}
while (index < length) {
character = value.charAt(index);
if (character !== C_TAB && character !== C_SPACE) {
break;
}
subvalue += character;
index++;
}
character = value.charAt(index);
if (!character || character === C_NEWLINE) {
if (silent) {
return true;
}
beforeURL = eat(beforeURL).test().end;
url = self.decode.raw(self.unescape(url), beforeURL);
if (title) {
beforeTitle = eat(beforeTitle).test().end;
title = self.decode.raw(self.unescape(title), beforeTitle);
}
return eat(subvalue)({
type: 'definition',
identifier: normalize(identifier),
title: title || null,
url: url
});
}
}
/* Check if `character` can be inside an enclosed URI. */
function isEnclosedURLCharacter(character) {
return character !== C_GT &&
character !== C_BRACKET_OPEN &&
character !== C_BRACKET_CLOSE;
}
isEnclosedURLCharacter.delimiter = C_GT;
/* Check if `character` can be inside an unclosed URI. */
function isUnclosedURLCharacter(character) {
return character !== C_BRACKET_OPEN &&
character !== C_BRACKET_CLOSE &&
!whitespace(character);
}
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