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<?php
namespace GuzzleHttp;
/**
* Utility methods used throughout Guzzle.
*/
final class Utils
{
/**
* Gets a value from an array using a path syntax to retrieve nested data.
*
* This method does not allow for keys that contain "/". You must traverse
* the array manually or using something more advanced like JMESPath to
* work with keys that contain "/".
*
* // Get the bar key of a set of nested arrays.
* // This is equivalent to $collection['foo']['baz']['bar'] but won't
* // throw warnings for missing keys.
* GuzzleHttp\get_path($data, 'foo/baz/bar');
*
* @param array $data Data to retrieve values from
* @param string $path Path to traverse and retrieve a value from
*
* @return mixed|null
*/
public static function getPath($data, $path)
{
$path = explode('/', $path);
while (null !== ($part = array_shift($path))) {
if (!is_array($data) || !isset($data[$part])) {
return null;
}
$data = $data[$part];
}
return $data;
}
/**
* Set a value in a nested array key. Keys will be created as needed to set
* the value.
*
* This function does not support keys that contain "/" or "[]" characters
* because these are special tokens used when traversing the data structure.
* A value may be prepended to an existing array by using "[]" as the final
* key of a path.
*
* GuzzleHttp\get_path($data, 'foo/baz'); // null
* GuzzleHttp\set_path($data, 'foo/baz/[]', 'a');
* GuzzleHttp\set_path($data, 'foo/baz/[]', 'b');
* GuzzleHttp\get_path($data, 'foo/baz');
* // Returns ['a', 'b']
*
* @param array $data Data to modify by reference
* @param string $path Path to set
* @param mixed $value Value to set at the key
*
* @throws \RuntimeException when trying to setPath using a nested path
* that travels through a scalar value.
*/
public static function setPath(&$data, $path, $value)
{
$current =& $data;
$queue = explode('/', $path);
while (null !== ($key = array_shift($queue))) {
if (!is_array($current)) {
throw new \RuntimeException("Trying to setPath {$path}, but "
. "{$key} is set and is not an array");
} elseif (!$queue) {
if ($key == '[]') {
$current[] = $value;
} else {
$current[$key] = $value;
}
} elseif (isset($current[$key])) {
$current =& $current[$key];
} else {
$current[$key] = [];
$current =& $current[$key];
}
}
}
/**
* Expands a URI template
*
* @param string $template URI template
* @param array $variables Template variables
*
* @return string
*/
public static function uriTemplate($template, array $variables)
{
if (function_exists('\\uri_template')) {
return \uri_template($template, $variables);
}
static $uriTemplate;
if (!$uriTemplate) {
$uriTemplate = new UriTemplate();
}
return $uriTemplate->expand($template, $variables);
}
/**
* Wrapper for JSON decode that implements error detection with helpful
* error messages.
*
* @param string $json JSON data to parse
* @param bool $assoc When true, returned objects will be converted
* into associative arrays.
* @param int $depth User specified recursion depth.
* @param int $options Bitmask of JSON decode options.
*
* @return mixed
* @throws \InvalidArgumentException if the JSON cannot be parsed.
* @link http://www.php.net/manual/en/function.json-decode.php
*/
public static function jsonDecode($json, $assoc = false, $depth = 512, $options = 0)
{
static $jsonErrors = [
JSON_ERROR_DEPTH => 'JSON_ERROR_DEPTH - Maximum stack depth exceeded',
JSON_ERROR_STATE_MISMATCH => 'JSON_ERROR_STATE_MISMATCH - Underflow or the modes mismatch',
JSON_ERROR_CTRL_CHAR => 'JSON_ERROR_CTRL_CHAR - Unexpected control character found',
JSON_ERROR_SYNTAX => 'JSON_ERROR_SYNTAX - Syntax error, malformed JSON',
JSON_ERROR_UTF8 => 'JSON_ERROR_UTF8 - Malformed UTF-8 characters, possibly incorrectly encoded'
];
$data = \json_decode($json, $assoc, $depth, $options);
if (JSON_ERROR_NONE !== json_last_error()) {
$last = json_last_error();
throw new \InvalidArgumentException(
'Unable to parse JSON data: '
. (isset($jsonErrors[$last])
? $jsonErrors[$last]
: 'Unknown error')
);
}
return $data;
}
}
|
