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<?php |
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namespace Drupal\graphql\Utility; |
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class StringHelper { |
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/** |
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* Turn a list of machine names into a camel-cased string. |
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* |
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* @return string |
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* A camel-cased concatenation of the input components. |
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* |
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* @throws \InvalidArgumentException |
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* If the provided input does can't be converted to a specification compliant |
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* string representation for field or type names. |
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*/ |
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public static function camelCase() { |
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$components = func_get_args(); |
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$string = is_array($components) ? implode('_', $components) : $components; |
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$filtered = preg_replace('/^[^_a-zA-Z]+/', '', $string); |
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$components = array_filter(preg_split('/[^a-zA-Z0-9]/', $filtered)); |
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if (!count($components)) { |
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throw new \InvalidArgumentException(sprintf("Failed to create a specification compliant string representation for '%s'.", $string)); |
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} |
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return implode('', array_map('ucfirst', $components)); |
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} |
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/** |
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* Turn a list of machine names into a property-cased string. |
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* |
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* @return string |
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* A camel-cased concatenation of the input components. |
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*/ |
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public static function propCase() { |
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$result = call_user_func_array([static::class, 'camelCase'], func_get_args()); |
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return ctype_upper($result) ? strtolower($result) : lcfirst($result); |
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} |
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/** |
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* Wraps a type string in brackets declaring it as a list. |
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* |
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* @param string $type |
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* The type to declare as a list. |
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* |
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* @return string |
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* The decorated type string. |
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*/ |
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public static function listType($type) { |
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return "[$type]"; |
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} |
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/** |
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* Appends an exclamation mark to a type string declaring it as non-null. |
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* |
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* @param string $type |
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* The type to declare as non-null. |
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* |
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* @return string |
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* The decorated type string. |
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*/ |
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public static function nonNullType($type) { |
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return "$type!"; |
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} |
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/** |
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* Decorates a type as non-null and/or as a list. |
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* |
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* @param string $type |
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* The type to declare as non-null. |
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* @param bool $list |
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* Whether to mark the type as a list. |
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* @param bool $required |
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* Whether to mark the type as required. |
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* |
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* @return string |
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* The decorated type. |
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*/ |
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public static function decorateType($type, $list = FALSE, $required = FALSE) { |
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if (!empty($list)) { |
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$type = static::listType($type); |
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} |
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if (!empty($required)) { |
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$type = static::nonNullType($type); |
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} |
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return $type; |
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} |
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/** |
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* Parses a type definition from a string and properly decorates it. |
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* |
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* Converts type strings (e.g. [Foo!]) to their object representations. |
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* |
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* @param string $type |
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* The type string to parse. |
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* |
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* @return array |
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* The extracted type with the type decorators. |
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*/ |
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public static function parseType($type) { |
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$decorators = []; |
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$unwrapped = $type; |
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$matches = NULL; |
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while (preg_match('/[\[\]!]/', $unwrapped) && preg_match_all('/^(\[?)(.*?)(\]?)(!*?)$/', $unwrapped, $matches)) { |
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if ($unwrapped === $matches[2][0] || empty($matches[1][0]) !== empty($matches[3][0])) { |
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throw new \InvalidArgumentException(sprintf("Invalid type declaration '%s'.", $type)); |
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} |
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if (!empty($matches[4][0])) { |
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array_unshift($decorators, ['GraphQL\Type\Definition\Type', 'nonNull']); |
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} |
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if (!empty($matches[1][0]) && !empty($matches[3][0])) { |
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array_unshift($decorators, ['GraphQL\Type\Definition\Type', 'listOf']); |
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} |
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$unwrapped = $matches[2][0]; |
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} |
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return [$unwrapped, $decorators]; |
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} |
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} |
drupal-graphql /
graphql
