function parseObjectField($isConst, &$fieldNames)
{
$start = $this->token->start;
$name = $this->parseName();
if (array_key_exists($name->value, $fieldNames)) {
throw Exception::create($this->source, $start, "Duplicate input object field " . $name->value . '.');
}
$fieldNames[$name->value] = true;
$this->expect(Token::COLON);
return new ObjectField(array('name' => $name, 'value' => $this->parseValue($isConst), 'loc' => $this->loc($start)));
}
private function readString($start)
{
$body = $this->source->body;
$bodyLength = $this->source->length;
$position = $start + 1;
$chunkStart = $position;
$code = null;
$value = '';
while ($position < $bodyLength && ($code = Utils::charCodeAt($body, $position)) && $code !== 34 && $code !== 10 && $code !== 13 && $code !== 0x2028 && $code !== 0x2029) {
++$position;
if ($code === 92) {
// \
$value .= mb_substr($body, $chunkStart, $position - 1 - $chunkStart, 'UTF-8');
$code = Utils::charCodeAt($body, $position);
switch ($code) {
case 34:
$value .= '"';
break;
case 47:
$value .= '\\/';
break;
case 92:
$value .= '\\';
break;
case 98:
$value .= '\\b';
break;
case 102:
$value .= '\\f';
break;
case 110:
$value .= '\\n';
break;
case 114:
$value .= '\\r';
break;
case 116:
$value .= '\\t';
break;
case 117:
$hex = mb_substr($body, $position + 1, 4);
if (!preg_match('/[0-9a-fA-F]{4}/', $hex)) {
throw Exception::create($this->source, $position, 'Bad character escape sequence');
}
$value .= Utils::chr(hexdec($hex));
$position += 4;
break;
default:
throw Exception::create($this->source, $position, 'Bad character escape sequence');
}
++$position;
$chunkStart = $position;
}
}
if ($code !== 34) {
throw Exception::create($this->source, $position, 'Unterminated string');
}
$value .= mb_substr($body, $chunkStart, $position - $chunkStart, 'UTF-8');
return new Token(Token::STRING, $start, $position + 1, $value);
}
