function startsWithEntity(value) {
var prefix;
if (value.charAt(0) !== AMPERSAND) {
return false;
}
prefix = value.split(AMPERSAND, 2).join(AMPERSAND);
return decode(prefix).length !== prefix.length;
}
// Returns the length of HTML entity that is a prefix of the given string
// (excluding the ampersand), 0 if it does not start with an entity.
function length(value) {
var prefix
/* istanbul ignore if - Currently also tested for at implemention, but we
* keep it here because that’s proper. */
if (value.charAt(0) !== ampersand) {
return 0
}
prefix = value.split(ampersand, 2).join(ampersand)
return prefix.length - decode(prefix).length
}
/**
* Returns the length of HTML entity that is a prefix of
* the given string (excluding the ampersand), 0 if it
* does not start with an entity.
*
* @example
* entityPrefixLength('©cat') // 4
* entityPrefixLength('&foo & &bar') // 0
*
* @param {string} value - Input string.
* @return {number} - Length of an entity.
*/
function length(value) {
var prefix;
/* istanbul ignore if - Currently also tested for at
* implemention, but we keep it here because that’s
* proper. */
if (value.charAt(0) !== '&') {
return 0;
}
prefix = value.split('&', 2).join('&');
return prefix.length - decode(prefix).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
});
}
function url(eat, value, silent) {
var self = this
var subvalue
var content
var character
var index
var position
var protocol
var match
var length
var queue
var parenCount
var nextCharacter
var tokenizers
var exit
if (!self.options.gfm) {
return
}
subvalue = ''
index = -1
while (++index < protocolsLength) {
protocol = protocols[index]
match = value.slice(0, protocol.length)
if (match.toLowerCase() === protocol) {
subvalue = match
break
}
}
if (!subvalue) {
return
}
index = subvalue.length
length = value.length
queue = ''
parenCount = 0
while (index < length) {
character = value.charAt(index)
if (whitespace(character) || character === lessThan) {
break
}
if (
character === dot ||
character === comma ||
character === colon ||
character === semicolon ||
character === quotationMark ||
character === apostrophe ||
character === rightParenthesis ||
character === rightSquareBracket
) {
nextCharacter = value.charAt(index + 1)
if (!nextCharacter || whitespace(nextCharacter)) {
break
}
}
if (character === leftParenthesis || character === leftSquareBracket) {
parenCount++
}
if (character === rightParenthesis || character === rightSquareBracket) {
parenCount--
if (parenCount < 0) {
break
}
}
queue += character
index++
}
if (!queue) {
return
}
subvalue += queue
content = subvalue
if (protocol === mailto) {
position = queue.indexOf(atSign)
if (position === -1 || position === length - 1) {
return
}
content = content.substr(mailto.length)
}
/* istanbul ignore if - never used (yet) */
if (silent) {
return true
}
exit = self.enterLink()
// Temporarily remove all tokenizers except text in url.
tokenizers = self.inlineTokenizers
self.inlineTokenizers = {text: tokenizers.text}
content = self.tokenizeInline(content, eat.now())
self.inlineTokenizers = tokenizers
exit()
return eat(subvalue)({
type: 'link',
title: null,
url: decode(subvalue, {nonTerminated: false}),
children: content
})
}
/* Tokenise a URL. */
function url(eat, value, silent) {
var self = this;
var subvalue;
var content;
var character;
var index;
var position;
var protocol;
var match;
var length;
var queue;
var parenCount;
var nextCharacter;
var exit;
if (!self.options.gfm) {
return;
}
subvalue = '';
index = -1;
length = PROTOCOLS_LENGTH;
while (++index < length) {
protocol = PROTOCOLS[index];
match = value.slice(0, protocol.length);
if (match.toLowerCase() === protocol) {
subvalue = match;
break;
}
}
if (!subvalue) {
return;
}
index = subvalue.length;
length = value.length;
queue = '';
parenCount = 0;
while (index < length) {
character = value.charAt(index);
if (whitespace(character) || character === C_LT) {
break;
}
if (
character === '.' ||
character === ',' ||
character === ':' ||
character === ';' ||
character === '"' ||
character === '\'' ||
character === ')' ||
character === ']'
) {
nextCharacter = value.charAt(index + 1);
if (!nextCharacter || whitespace(nextCharacter)) {
break;
}
}
if (character === C_PAREN_OPEN || character === C_BRACKET_OPEN) {
parenCount++;
}
if (character === C_PAREN_CLOSE || character === C_BRACKET_CLOSE) {
parenCount--;
if (parenCount < 0) {
break;
}
}
queue += character;
index++;
}
if (!queue) {
return;
}
subvalue += queue;
content = subvalue;
if (protocol === MAILTO_PROTOCOL) {
position = queue.indexOf(C_AT_SIGN);
if (position === -1 || position === length - 1) {
return;
}
content = content.substr(MAILTO_PROTOCOL.length);
}
/* istanbul ignore if - never used (yet) */
if (silent) {
return true;
}
exit = self.enterLink();
content = self.tokenizeInline(content, eat.now());
exit();
return eat(subvalue)({
type: 'link',
title: null,
url: decode(subvalue),
children: content
});
}