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<?php
namespace GuzzleHttp;
/**
* Parses query strings into a Query object.
*
* While parsing, the parser will attempt to determine the most appropriate
* query string aggregator to use when serializing the parsed query string
* object back into a string. The hope is that parsing then serializing a
* query string should be a lossless operation.
*
* @internal Use Query::fromString()
*/
class QueryParser
{
private $duplicates;
private $numericIndices;
/**
* Parse a query string into a Query object.
*
* @param Query $query Query object to populate
* @param string $str Query string to parse
* @param bool|string $urlEncoding How the query string is encoded
*/
public function parseInto(Query $query, $str, $urlEncoding = true)
{
if ($str === '') {
return;
}
$result = [];
$this->duplicates = false;
$this->numericIndices = true;
$decoder = self::getDecoder($urlEncoding);
foreach (explode('&', $str) as $kvp) {
$parts = explode('=', $kvp, 2);
$key = $decoder($parts[0]);
$value = isset($parts[1]) ? $decoder($parts[1]) : null;
// Special handling needs to be taken for PHP nested array syntax
if (strpos($key, '[') !== false) {
$this->parsePhpValue($key, $value, $result);
continue;
}
if (!isset($result[$key])) {
$result[$key] = $value;
} else {
$this->duplicates = true;
if (!is_array($result[$key])) {
$result[$key] = [$result[$key]];
}
$result[$key][] = $value;
}
}
$query->replace($result);
if (!$this->numericIndices) {
$query->setAggregator(Query::phpAggregator(false));
} elseif ($this->duplicates) {
$query->setAggregator(Query::duplicateAggregator());
}
}
/**
* Returns a callable that is used to URL decode query keys and values.
*
* @param string|bool $type One of true, false, RFC3986, and RFC1738
*
* @return callable|string
*/
private static function getDecoder($type)
{
if ($type === true) {
return function ($value) {
return rawurldecode(str_replace('+', ' ', $value));
};
} elseif ($type == Query::RFC3986) {
return 'rawurldecode';
} elseif ($type == Query::RFC1738) {
return 'urldecode';
} else {
return function ($str) { return $str; };
}
}
/**
* Parses a PHP style key value pair.
*
* @param string $key Key to parse (e.g., "foo[a][b]")
* @param string|null $value Value to set
* @param array $result Result to modify by reference
*/
private function parsePhpValue($key, $value, array &$result)
{
$node =& $result;
$keyBuffer = '';
for ($i = 0, $t = strlen($key); $i < $t; $i++) {
switch ($key[$i]) {
case '[':
if ($keyBuffer) {
$this->prepareNode($node, $keyBuffer);
$node =& $node[$keyBuffer];
$keyBuffer = '';
}
break;
case ']':
$k = $this->cleanKey($node, $keyBuffer);
$this->prepareNode($node, $k);
$node =& $node[$k];
$keyBuffer = '';
break;
default:
$keyBuffer .= $key[$i];
break;
}
}
if (isset($node)) {
$this->duplicates = true;
$node[] = $value;
} else {
$node = $value;
}
}
/**
* Prepares a value in the array at the given key.
*
* If the key already exists, the key value is converted into an array.
*
* @param array $node Result node to modify
* @param string $key Key to add or modify in the node
*/
private function prepareNode(&$node, $key)
{
if (!isset($node[$key])) {
$node[$key] = null;
} elseif (!is_array($node[$key])) {
$node[$key] = [$node[$key]];
}
}
/**
* Returns the appropriate key based on the node and key.
*/
private function cleanKey($node, $key)
{
if ($key === '') {
$key = $node ? (string) count($node) : 0;
// Found a [] key, so track this to ensure that we disable numeric
// indexing of keys in the resolved query aggregator.
$this->numericIndices = false;
}
return $key;
}
}