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Inline.php
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<?php /* * This file is part of the Symfony package. * * (c) Fabien Potencier <fabien@symfony.com> * * For the full copyright and license information, please view the LICENSE * file that was distributed with this source code. */ namespace Symfony\Component\Yaml; use Symfony\Component\Yaml\Exception\ParseException; use Symfony\Component\Yaml\Exception\DumpException; /** * Inline implements a YAML parser/dumper for the YAML inline syntax. * * @author Fabien Potencier <fabien@symfony.com> */ class Inline { const REGEX_QUOTED_STRING = '(?:"([^"\\\\]*(?:\\\\.[^"\\\\]*)*)"|\'([^\']*(?:\'\'[^\']*)*)\')'; private static $exceptionOnInvalidType = false; private static $objectSupport = false; /** * Converts a YAML string to a PHP array. * * @param string $value A YAML string * @param Boolean $exceptionOnInvalidType true if an exception must be thrown on invalid types (a PHP resource or object), false otherwise * @param Boolean $objectSupport true if object support is enabled, false otherwise * * @return array A PHP array representing the YAML string * * @throws ParseException */ public static function parse($value, $exceptionOnInvalidType = false, $objectSupport = false) { self::$exceptionOnInvalidType = $exceptionOnInvalidType; self::$objectSupport = $objectSupport; $value = trim($value); if (0 == strlen($value)) { return ''; } if (function_exists('mb_internal_encoding') && ((int) ini_get('mbstring.func_overload')) & 2) { $mbEncoding = mb_internal_encoding(); mb_internal_encoding('ASCII'); } $i = 0; switch ($value[0]) { case '[': $result = self::parseSequence($value, $i); ++$i; break; case '{': $result = self::parseMapping($value, $i); ++$i; break; default: $result = self::parseScalar($value, null, array('"', "'"), $i); } // some comments are allowed at the end if (preg_replace('/\s+#.*$/A', '', substr($value, $i))) { throw new ParseException(sprintf('Unexpected characters near "%s".', substr($value, $i))); } if (isset($mbEncoding)) { mb_internal_encoding($mbEncoding); } return $result; } /** * Dumps a given PHP variable to a YAML string. * * @param mixed $value The PHP variable to convert * @param Boolean $exceptionOnInvalidType true if an exception must be thrown on invalid types (a PHP resource or object), false otherwise * @param Boolean $objectSupport true if object support is enabled, false otherwise * * @return string The YAML string representing the PHP array * * @throws DumpException When trying to dump PHP resource */ public static function dump($value, $exceptionOnInvalidType = false, $objectSupport = false) { switch (true) { case is_resource($value): if ($exceptionOnInvalidType) { throw new DumpException(sprintf('Unable to dump PHP resources in a YAML file ("%s").', get_resource_type($value))); } return 'null'; case is_object($value): if ($objectSupport) { return '!!php/object:'.serialize($value); } if ($exceptionOnInvalidType) { throw new DumpException('Object support when dumping a YAML file has been disabled.'); } return 'null'; case is_array($value): return self::dumpArray($value, $exceptionOnInvalidType, $objectSupport); case null === $value: return 'null'; case true === $value: return 'true'; case false === $value: return 'false'; case ctype_digit($value): return is_string($value) ? "'$value'" : (int) $value; case is_numeric($value): $locale = setlocale(LC_NUMERIC, 0); if (false !== $locale) { setlocale(LC_NUMERIC, 'C'); } $repr = is_string($value) ? "'$value'" : (is_infinite($value) ? str_ireplace('INF', '.Inf', strval($value)) : strval($value)); if (false !== $locale) { setlocale(LC_NUMERIC, $locale); } return $repr; case Escaper::requiresDoubleQuoting($value): return Escaper::escapeWithDoubleQuotes($value); case Escaper::requiresSingleQuoting($value): return Escaper::escapeWithSingleQuotes($value); case '' == $value: return "''"; case preg_match(self::getTimestampRegex(), $value): case in_array(strtolower($value), array('null', '~', 'true', 'false')): return "'$value'"; default: return $value; } } /** * Dumps a PHP array to a YAML string. * * @param array $value The PHP array to dump * @param Boolean $exceptionOnInvalidType true if an exception must be thrown on invalid types (a PHP resource or object), false otherwise * @param Boolean $objectSupport true if object support is enabled, false otherwise * * @return string The YAML string representing the PHP array */ private static function dumpArray($value, $exceptionOnInvalidType, $objectSupport) { // array $keys = array_keys($value); if ((1 == count($keys) && '0' == $keys[0]) || (count($keys) > 1 && array_reduce($keys, function ($v, $w) { return (integer) $v + $w; }, 0) == count($keys) * (count($keys) - 1) / 2) ) { $output = array(); foreach ($value as $val) { $output[] = self::dump($val, $exceptionOnInvalidType, $objectSupport); } return sprintf('[%s]', implode(', ', $output)); } // mapping $output = array(); foreach ($value as $key => $val) { $output[] = sprintf('%s: %s', self::dump($key, $exceptionOnInvalidType, $objectSupport), self::dump($val, $exceptionOnInvalidType, $objectSupport)); } return sprintf('{ %s }', implode(', ', $output)); } /** * Parses a scalar to a YAML string. * * @param scalar $scalar * @param string $delimiters * @param array $stringDelimiters * @param integer &$i * @param Boolean $evaluate * * @return string A YAML string * * @throws ParseException When malformed inline YAML string is parsed */ public static function parseScalar($scalar, $delimiters = null, $stringDelimiters = array('"', "'"), &$i = 0, $evaluate = true) { if (in_array($scalar[$i], $stringDelimiters)) { // quoted scalar $output = self::parseQuotedScalar($scalar, $i); if (null !== $delimiters) { $tmp = ltrim(substr($scalar, $i), ' '); if (!in_array($tmp[0], $delimiters)) { throw new ParseException(sprintf('Unexpected characters (%s).', substr($scalar, $i))); } } } else { // "normal" string if (!$delimiters) { $output = substr($scalar, $i); $i += strlen($output); // remove comments if (false !== $strpos = strpos($output, ' #')) { $output = rtrim(substr($output, 0, $strpos)); } } elseif (preg_match('/^(.+?)('.implode('|', $delimiters).')/', substr($scalar, $i), $match)) { $output = $match[1]; $i += strlen($output); } else { throw new ParseException(sprintf('Malformed inline YAML string (%s).', $scalar)); } if ($evaluate) { $output = self::evaluateScalar($output); } } return $output; } /** * Parses a quoted scalar to YAML. * * @param string $scalar * @param integer &$i * * @return string A YAML string * * @throws ParseException When malformed inline YAML string is parsed */ private static function parseQuotedScalar($scalar, &$i) { if (!preg_match('/'.self::REGEX_QUOTED_STRING.'/Au', substr($scalar, $i), $match)) { throw new ParseException(sprintf('Malformed inline YAML string (%s).', substr($scalar, $i))); } $output = substr($match[0], 1, strlen($match[0]) - 2); $unescaper = new Unescaper(); if ('"' == $scalar[$i]) { $output = $unescaper->unescapeDoubleQuotedString($output); } else { $output = $unescaper->unescapeSingleQuotedString($output); } $i += strlen($match[0]); return $output; } /** * Parses a sequence to a YAML string. * * @param string $sequence * @param integer &$i * * @return string A YAML string * * @throws ParseException When malformed inline YAML string is parsed */ private static function parseSequence($sequence, &$i = 0) { $output = array(); $len = strlen($sequence); $i += 1; // [foo, bar, ...] while ($i < $len) { switch ($sequence[$i]) { case '[': // nested sequence $output[] = self::parseSequence($sequence, $i); break; case '{': // nested mapping $output[] = self::parseMapping($sequence, $i); break; case ']': return $output; case ',': case ' ': break; default: $isQuoted = in_array($sequence[$i], array('"', "'")); $value = self::parseScalar($sequence, array(',', ']'), array('"', "'"), $i); if (!$isQuoted && false !== strpos($value, ': ')) { // embedded mapping? try { $value = self::parseMapping('{'.$value.'}'); } catch (\InvalidArgumentException $e) { // no, it's not } } $output[] = $value; --$i; } ++$i; } throw new ParseException(sprintf('Malformed inline YAML string %s', $sequence)); } /** * Parses a mapping to a YAML string. * * @param string $mapping * @param integer &$i * * @return string A YAML string * * @throws ParseException When malformed inline YAML string is parsed */ private static function parseMapping($mapping, &$i = 0) { $output = array(); $len = strlen($mapping); $i += 1; // {foo: bar, bar:foo, ...} while ($i < $len) { switch ($mapping[$i]) { case ' ': case ',': ++$i; continue 2; case '}': return $output; } // key $key = self::parseScalar($mapping, array(':', ' '), array('"', "'"), $i, false); // value $done = false; while ($i < $len) { switch ($mapping[$i]) { case '[': // nested sequence $output[$key] = self::parseSequence($mapping, $i); $done = true; break; case '{': // nested mapping $output[$key] = self::parseMapping($mapping, $i); $done = true; break; case ':': case ' ': break; default: $output[$key] = self::parseScalar($mapping, array(',', '}'), array('"', "'"), $i); $done = true; --$i; } ++$i; if ($done) { continue 2; } } } throw new ParseException(sprintf('Malformed inline YAML string %s', $mapping)); } /** * Evaluates scalars and replaces magic values. * * @param string $scalar * * @return string A YAML string */ private static function evaluateScalar($scalar) { $scalar = trim($scalar); $scalarLower = strtolower($scalar); switch (true) { case 'null' === $scalarLower: case '' === $scalar: case '~' === $scalar: return null; case 'true' === $scalarLower: return true; case 'false' === $scalarLower: return false; // Optimise for returning strings. case $scalar[0] === '+' || $scalar[0] === '-' || $scalar[0] === '.' || $scalar[0] === '!' || is_numeric($scalar[0]): switch (true) { case 0 === strpos($scalar, '!str'): return (string) substr($scalar, 5); case 0 === strpos($scalar, '! '): return intval(self::parseScalar(substr($scalar, 2))); case 0 === strpos($scalar, '!!php/object:'): if (self::$objectSupport) { return unserialize(substr($scalar, 13)); } if (self::$exceptionOnInvalidType) { throw new ParseException('Object support when parsing a YAML file has been disabled.'); } return null; case ctype_digit($scalar): $raw = $scalar; $cast = intval($scalar); return '0' == $scalar[0] ? octdec($scalar) : (((string) $raw == (string) $cast) ? $cast : $raw); case '-' === $scalar[0] && ctype_digit(substr($scalar, 1)): $raw = $scalar; $cast = intval($scalar); return '0' == $scalar[1] ? octdec($scalar) : (((string) $raw == (string) $cast) ? $cast : $raw); case is_numeric($scalar): return '0x' == $scalar[0].$scalar[1] ? hexdec($scalar) : floatval($scalar); case '.inf' === $scalarLower: case '.nan' === $scalarLower: return -log(0); case '-.inf' === $scalarLower: return log(0); case preg_match('/^(-|\+)?[0-9,]+(\.[0-9]+)?$/', $scalar): return floatval(str_replace(',', '', $scalar)); case preg_match(self::getTimestampRegex(), $scalar): return strtotime($scalar); } default: return (string) $scalar; } } /** * Gets a regex that matches a YAML date. * * @return string The regular expression * * @see http://www.yaml.org/spec/1.2/spec.html#id2761573 */ private static function getTimestampRegex() { return <<<EOF ~^ (?P<year>[0-9][0-9][0-9][0-9]) -(?P<month>[0-9][0-9]?) -(?P<day>[0-9][0-9]?) (?:(?:[Tt]|[ \t]+) (?P<hour>[0-9][0-9]?) :(?P<minute>[0-9][0-9]) :(?P<second>[0-9][0-9]) (?:\.(?P<fraction>[0-9]*))? (?:[ \t]*(?P<tz>Z|(?P<tz_sign>[-+])(?P<tz_hour>[0-9][0-9]?) (?::(?P<tz_minute>[0-9][0-9]))?))?)? $~x EOF; } }