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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;
private static $objectForMap = false;
/**
* Converts a YAML string to a PHP array.
*
* @param string $value A YAML string
* @param bool $exceptionOnInvalidType true if an exception must be thrown on invalid types (a PHP resource or object), false otherwise
* @param bool $objectSupport true if object support is enabled, false otherwise
* @param bool $objectForMap true if maps should return a stdClass instead of array()
* @param array $references Mapping of variable names to values
*
* @return array A PHP array representing the YAML string
*
* @throws ParseException
*/
public static function parse($value, $exceptionOnInvalidType = false, $objectSupport = false, $objectForMap = false, $references = array())
{
self::$exceptionOnInvalidType = $exceptionOnInvalidType;
self::$objectSupport = $objectSupport;
self::$objectForMap = $objectForMap;
$value = trim($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, $references);
++$i;
break;
case '{':
$result = self::parseMapping($value, $i, $references);
++$i;
break;
default:
$result = self::parseScalar($value, null, array('"', "'"), $i, true, $references);
}
// some comments are allowed at the end
if (preg_replace('/\s+#.*$/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 bool $exceptionOnInvalidType true if an exception must be thrown on invalid types (a PHP resource or object), false otherwise
* @param bool $objectSupport true if object support is enabled, false otherwise
*
* @return string The YAML string representing the PHP array
*
* @throws DumpException When trying to dump PHP resource
*/
public static function dump($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 !== $locale) {
setlocale(LC_NUMERIC, 'C');
}
if (is_float($value)) {
$repr = (string) $value;
if (is_infinite($value)) {
$repr = str_ireplace('INF', '.Inf', $repr);
} elseif (floor($value) == $value && $repr == $value) {
// Preserve float data type since storing a whole number will result in integer value.
$repr = '!!float '.$repr;
}
} else {
$repr = is_string($value) ? "'$value'" : (string) $value;
}
if (false !== $locale) {
setlocale(LC_NUMERIC, $locale);
}
return $repr;
case '' == $value:
return "''";
case Escaper::requiresDoubleQuoting($value):
return Escaper::escapeWithDoubleQuotes($value);
case Escaper::requiresSingleQuoting($value):
case preg_match(self::getHexRegex(), $value):
case preg_match(self::getTimestampRegex(), $value):
return Escaper::escapeWithSingleQuotes($value);
default:
return $value;
}
}
/**
* Dumps a PHP array to a YAML string.
*
* @param array $value The PHP array to dump
* @param bool $exceptionOnInvalidType true if an exception must be thrown on invalid types (a PHP resource or object), false otherwise
* @param bool $objectSupport true if object support is enabled, false otherwise
*
* @return string The YAML string representing the PHP array
*/
private static function dumpArray($value, $exceptionOnInvalidType, $objectSupport)
{
// array
$keys = array_keys($value);
$keysCount = count($keys);
if ((1 === $keysCount && '0' == $keys[0])
|| ($keysCount > 1 && array_reduce($keys, function ($v, $w) { return (int) $v + $w; }, 0) === $keysCount * ($keysCount - 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 string $scalar
* @param string $delimiters
* @param array $stringDelimiters
* @param int &$i
* @param bool $evaluate
* @param array $references
*
* @return string A YAML string
*
* @throws ParseException When malformed inline YAML string is parsed
*/
public static function parseScalar($scalar, $delimiters = null, $stringDelimiters = array('"', "'"), &$i = 0, $evaluate = true, $references = array())
{
if (in_array($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, $references);
}
}
return $output;
}
/**
* Parses a quoted scalar to YAML.
*
* @param string $scalar
* @param int &$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 $sequence
* @param int &$i
* @param array $references
*
* @return string A YAML string
*
* @throws ParseException When malformed inline YAML string is parsed
*/
private static function parseSequence($sequence, &$i = 0, $references = array())
{
$output = array();
$len = strlen($sequence);
++$i;
// [foo, bar, ...]
while ($i < $len) {
switch ($sequence[$i]) {
case '[':
// nested sequence
$output[] = self::parseSequence($sequence, $i, $references);
break;
case '{':
// nested mapping
$output[] = self::parseMapping($sequence, $i, $references);
break;
case ']':
return $output;
case ',':
case ' ':
break;
default:
$isQuoted = in_array($sequence[$i], array('"', "'"));
$value = self::parseScalar($sequence, array(',', ']'), array('"', "'"), $i, true, $references);
// the value can be an array if a reference has been resolved to an array var
if (!is_array($value) && !$isQuoted && false !== strpos($value, ': ')) {
// embedded mapping?
try {
$pos = 0;
$value = self::parseMapping('{'.$value.'}', $pos, $references);
} 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 $mapping
* @param int &$i
* @param array $references
*
* @return string A YAML string
*
* @throws ParseException When malformed inline YAML string is parsed
*/
private static function parseMapping($mapping, &$i = 0, $references = array())
{
$output = array();
$len = strlen($mapping);
++$i;
// {foo: bar, bar:foo, ...}
while ($i < $len) {
switch ($mapping[$i]) {
case ' ':
case ',':
++$i;
continue 2;
case '}':
if (self::$objectForMap) {
return (object) $output;
}
return $output;
}
// key
$key = self::parseScalar($mapping, array(':', ' '), array('"', "'"), $i, false);
// value
$done = false;
while ($i < $len) {
switch ($mapping[$i]) {
case '[':
// nested sequence
$value = self::parseSequence($mapping, $i, $references);
// Spec: Keys MUST be unique; first one wins.
// Parser cannot abort this mapping earlier, since lines
// are processed sequentially.
if (!isset($output[$key])) {
$output[$key] = $value;
}
$done = true;
break;
case '{':
// nested mapping
$value = self::parseMapping($mapping, $i, $references);
// Spec: Keys MUST be unique; first one wins.
// Parser cannot abort this mapping earlier, since lines
// are processed sequentially.
if (!isset($output[$key])) {
$output[$key] = $value;
}
$done = true;
break;
case ':':
case ' ':
break;
default:
$value = self::parseScalar($mapping, array(',', '}'), array('"', "'"), $i, true, $references);
// Spec: Keys MUST be unique; first one wins.
// Parser cannot abort this mapping earlier, since lines
// are processed sequentially.
if (!isset($output[$key])) {
$output[$key] = $value;
}
$done = true;
--$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
* @param array $references
*
* @return string A YAML string
*
* @throws ParseException when object parsing support was disabled and the parser detected a PHP object or when a reference could not be resolved
*/
private static function evaluateScalar($scalar, $references = array())
{
$scalar = trim($scalar);
$scalarLower = strtolower($scalar);
if (0 === strpos($scalar, '*')) {
if (false !== $pos = strpos($scalar, '#')) {
$value = substr($scalar, 1, $pos - 2);
} else {
$value = substr($scalar, 1);
}
// an unquoted *
if (false === $value || '' === $value) {
throw new ParseException('A reference must contain at least one character.');
}
if (!array_key_exists($value, $references)) {
throw new ParseException(sprintf('Reference "%s" does not exist.', $value));
}
return $references[$value];
}
switch (true) {
case 'null' === $scalarLower:
case '' === $scalar:
case '~' === $scalar:
return;
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($scalar, '! '):
return (int) self::parseScalar(substr($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;
case 0 === strpos($scalar, '!!float '):
return (float) substr($scalar, 8);
case ctype_digit($scalar):
$raw = $scalar;
$cast = (int) $scalar;
return '0' == $scalar[0] ? octdec($scalar) : (((string) $raw == (string) $cast) ? $cast : $raw);
case '-' === $scalar[0] && ctype_digit(substr($scalar, 1)):
$raw = $scalar;
$cast = (int) $scalar;
return '0' == $scalar[1] ? octdec($scalar) : (((string) $raw === (string) $cast) ? $cast : $raw);
case is_numeric($scalar):
case preg_match(self::getHexRegex(), $scalar):
return '0x' === $scalar[0].$scalar[1] ? hexdec($scalar) : (float) $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 (float) 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]))?))?)?
$~x
EOF;
}
/**
* Gets a regex that matches a YAML number in hexadecimal notation.
*
* @return string
*/
private static function getHexRegex()
{
return '~^0x[0-9a-f]++$~i';
}
}