--- /dev/null
+<?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\DependencyInjection\ParameterBag;
+
+use Symfony\Component\DependencyInjection\Exception\ParameterNotFoundException;
+use Symfony\Component\DependencyInjection\Exception\ParameterCircularReferenceException;
+use Symfony\Component\DependencyInjection\Exception\RuntimeException;
+
+/**
+ * Holds parameters.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class ParameterBag implements ParameterBagInterface
+{
+ protected $parameters = array();
+ protected $resolved = false;
+
+ /**
+ * @param array $parameters An array of parameters
+ */
+ public function __construct(array $parameters = array())
+ {
+ $this->add($parameters);
+ }
+
+ /**
+ * Clears all parameters.
+ */
+ public function clear()
+ {
+ $this->parameters = array();
+ }
+
+ /**
+ * Adds parameters to the service container parameters.
+ *
+ * @param array $parameters An array of parameters
+ */
+ public function add(array $parameters)
+ {
+ foreach ($parameters as $key => $value) {
+ $this->parameters[strtolower($key)] = $value;
+ }
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function all()
+ {
+ return $this->parameters;
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function get($name)
+ {
+ $name = strtolower($name);
+
+ if (!array_key_exists($name, $this->parameters)) {
+ if (!$name) {
+ throw new ParameterNotFoundException($name);
+ }
+
+ $alternatives = array();
+ foreach ($this->parameters as $key => $parameterValue) {
+ $lev = levenshtein($name, $key);
+ if ($lev <= strlen($name) / 3 || false !== strpos($key, $name)) {
+ $alternatives[] = $key;
+ }
+ }
+
+ throw new ParameterNotFoundException($name, null, null, null, $alternatives);
+ }
+
+ return $this->parameters[$name];
+ }
+
+ /**
+ * Sets a service container parameter.
+ *
+ * @param string $name The parameter name
+ * @param mixed $value The parameter value
+ */
+ public function set($name, $value)
+ {
+ $this->parameters[strtolower($name)] = $value;
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function has($name)
+ {
+ return array_key_exists(strtolower($name), $this->parameters);
+ }
+
+ /**
+ * Removes a parameter.
+ *
+ * @param string $name The parameter name
+ */
+ public function remove($name)
+ {
+ unset($this->parameters[strtolower($name)]);
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function resolve()
+ {
+ if ($this->resolved) {
+ return;
+ }
+
+ $parameters = array();
+ foreach ($this->parameters as $key => $value) {
+ try {
+ $value = $this->resolveValue($value);
+ $parameters[$key] = $this->unescapeValue($value);
+ } catch (ParameterNotFoundException $e) {
+ $e->setSourceKey($key);
+
+ throw $e;
+ }
+ }
+
+ $this->parameters = $parameters;
+ $this->resolved = true;
+ }
+
+ /**
+ * Replaces parameter placeholders (%name%) by their values.
+ *
+ * @param mixed $value A value
+ * @param array $resolving An array of keys that are being resolved (used internally to detect circular references)
+ *
+ * @return mixed The resolved value
+ *
+ * @throws ParameterNotFoundException if a placeholder references a parameter that does not exist
+ * @throws ParameterCircularReferenceException if a circular reference if detected
+ * @throws RuntimeException when a given parameter has a type problem.
+ */
+ public function resolveValue($value, array $resolving = array())
+ {
+ if (is_array($value)) {
+ $args = array();
+ foreach ($value as $k => $v) {
+ $args[$this->resolveValue($k, $resolving)] = $this->resolveValue($v, $resolving);
+ }
+
+ return $args;
+ }
+
+ if (!is_string($value)) {
+ return $value;
+ }
+
+ return $this->resolveString($value, $resolving);
+ }
+
+ /**
+ * Resolves parameters inside a string.
+ *
+ * @param string $value The string to resolve
+ * @param array $resolving An array of keys that are being resolved (used internally to detect circular references)
+ *
+ * @return string The resolved string
+ *
+ * @throws ParameterNotFoundException if a placeholder references a parameter that does not exist
+ * @throws ParameterCircularReferenceException if a circular reference if detected
+ * @throws RuntimeException when a given parameter has a type problem.
+ */
+ public function resolveString($value, array $resolving = array())
+ {
+ // we do this to deal with non string values (Boolean, integer, ...)
+ // as the preg_replace_callback throw an exception when trying
+ // a non-string in a parameter value
+ if (preg_match('/^%([^%\s]+)%$/', $value, $match)) {
+ $key = strtolower($match[1]);
+
+ if (isset($resolving[$key])) {
+ throw new ParameterCircularReferenceException(array_keys($resolving));
+ }
+
+ $resolving[$key] = true;
+
+ return $this->resolved ? $this->get($key) : $this->resolveValue($this->get($key), $resolving);
+ }
+
+ $self = $this;
+
+ return preg_replace_callback('/%%|%([^%\s]+)%/', function ($match) use ($self, $resolving, $value) {
+ // skip %%
+ if (!isset($match[1])) {
+ return '%%';
+ }
+
+ $key = strtolower($match[1]);
+ if (isset($resolving[$key])) {
+ throw new ParameterCircularReferenceException(array_keys($resolving));
+ }
+
+ $resolved = $self->get($key);
+
+ if (!is_string($resolved) && !is_numeric($resolved)) {
+ throw new RuntimeException(sprintf('A string value must be composed of strings and/or numbers, but found parameter "%s" of type %s inside string value "%s".', $key, gettype($resolved), $value));
+ }
+
+ $resolved = (string) $resolved;
+ $resolving[$key] = true;
+
+ return $self->isResolved() ? $resolved : $self->resolveString($resolved, $resolving);
+ }, $value);
+ }
+
+ public function isResolved()
+ {
+ return $this->resolved;
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function escapeValue($value)
+ {
+ if (is_string($value)) {
+ return str_replace('%', '%%', $value);
+ }
+
+ if (is_array($value)) {
+ $result = array();
+ foreach ($value as $k => $v) {
+ $result[$k] = $this->escapeValue($v);
+ }
+
+ return $result;
+ }
+
+ return $value;
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function unescapeValue($value)
+ {
+ if (is_string($value)) {
+ return str_replace('%%', '%', $value);
+ }
+
+ if (is_array($value)) {
+ $result = array();
+ foreach ($value as $k => $v) {
+ $result[$k] = $this->unescapeValue($v);
+ }
+
+ return $result;
+ }
+
+ return $value;
+ }
+}
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