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'ListValue', * 'values' => [ * ['kind' => 'StringValue', 'value' => 'my str'], * ['kind' => 'StringValue', 'value' => 'my other str'] * ], * 'loc' => ['start' => 21, 'end' => 25] * ]); * ``` * * Will produce instance of `ListValueNode` where `values` prop is a lazily-evaluated `NodeList` * returning instances of `StringValueNode` on access. * * This is a reverse operation for AST::toArray($node) * * @param array $node * * @api * * @throws \JsonException * @throws InvariantViolation */ public static function fromArray(array $node): Node { $kind = $node['kind'] ?? null; if ($kind === null) { $safeNode = Utils::printSafeJson($node); throw new InvariantViolation("Node is missing kind: {$safeNode}"); } $class = NodeKind::CLASS_MAP[$kind] ?? null; if ($class === null) { $safeNode = Utils::printSafeJson($node); throw new InvariantViolation("Node has unexpected kind: {$safeNode}"); } $instance = new $class([]); if (isset($node['loc']['start'], $node['loc']['end'])) { $instance->loc = Location::create($node['loc']['start'], $node['loc']['end']); } foreach ($node as $key => $value) { if ($key === 'loc' || $key === 'kind') { continue; } if (is_array($value)) { $value = isset($value[0]) || $value === [] ? new NodeList($value) : self::fromArray($value); } $instance->{$key} = $value; } return $instance; } /** * Convert AST node to serializable array. * * @return array * * @api */ public static function toArray(Node $node): array { return $node->toArray(); } /** * Produces a Automattic\WooCommerce\Vendor\GraphQL Value AST given a PHP value. * * Optionally, a Automattic\WooCommerce\Vendor\GraphQL type may be provided, which will be used to * disambiguate between value primitives. * * | PHP Value | Automattic\WooCommerce\Vendor\GraphQL Value | * | ------------- | -------------------- | * | Object | Input Object | * | Assoc Array | Input Object | * | Array | List | * | Boolean | Boolean | * | String | String / Enum Value | * | Int | Int | * | Float | Int / Float | * | Mixed | Enum Value | * | null | NullValue | * * @param mixed $value * @param InputType&Type $type * * @throws \JsonException * @throws InvariantViolation * @throws SerializationError * * @return (ValueNode&Node)|null * * @api */ public static function astFromValue($value, InputType $type): ?ValueNode { if ($type instanceof NonNull) { $wrappedType = $type->getWrappedType(); assert($wrappedType instanceof InputType); $astValue = self::astFromValue($value, $wrappedType); return $astValue instanceof NullValueNode ? null : $astValue; } if ($value === null) { return new NullValueNode([]); } // Convert PHP iterables to Automattic\WooCommerce\Vendor\GraphQL list. If the GraphQLType is a list, but // the value is not an array, convert the value using the list's item type. if ($type instanceof ListOfType) { $itemType = $type->getWrappedType(); assert($itemType instanceof InputType, 'proven by schema validation'); if (is_iterable($value)) { $valuesNodes = []; foreach ($value as $item) { $itemNode = self::astFromValue($item, $itemType); if ($itemNode !== null) { $valuesNodes[] = $itemNode; } } return new ListValueNode(['values' => new NodeList($valuesNodes)]); } return self::astFromValue($value, $itemType); } // Populate the fields of the input object by creating ASTs from each value // in the PHP object according to the fields in the input type. if ($type instanceof InputObjectType) { $isArray = is_array($value); $isArrayLike = $isArray || $value instanceof \ArrayAccess; if (! $isArrayLike && ! is_object($value)) { return null; } $fields = $type->getFields(); $fieldNodes = []; foreach ($fields as $fieldName => $field) { $fieldValue = $isArrayLike ? $value[$fieldName] ?? null : $value->{$fieldName} ?? null; // Have to check additionally if key exists, since we differentiate between // "no key" and "value is null": if ($fieldValue !== null) { $fieldExists = true; } elseif ($isArray) { $fieldExists = array_key_exists($fieldName, $value); } elseif ($isArrayLike) { $fieldExists = $value->offsetExists($fieldName); } else { $fieldExists = property_exists($value, $fieldName); } if (! $fieldExists) { continue; } $fieldNode = self::astFromValue($fieldValue, $field->getType()); if ($fieldNode === null) { continue; } $fieldNodes[] = new ObjectFieldNode([ 'name' => new NameNode(['value' => $fieldName]), 'value' => $fieldNode, ]); } return new ObjectValueNode(['fields' => new NodeList($fieldNodes)]); } assert($type instanceof LeafType, 'other options were exhausted'); // Since value is an internally represented value, it must be serialized // to an externally represented value before converting into an AST. $serialized = $type->serialize($value); // Others serialize based on their corresponding PHP scalar types. if (is_bool($serialized)) { return new BooleanValueNode(['value' => $serialized]); } if (is_int($serialized)) { return new IntValueNode(['value' => (string) $serialized]); } if (is_float($serialized)) { /** @phpstan-ignore equal.notAllowed (int cast with == used for performance reasons) */ if ((int) $serialized == $serialized) { return new IntValueNode(['value' => (string) $serialized]); } return new FloatValueNode(['value' => (string) $serialized]); } if (is_string($serialized)) { // Enum types use Enum literals. if ($type instanceof EnumType) { return new EnumValueNode(['value' => $serialized]); } // ID types can use Int literals. $asInt = (int) $serialized; if ($type instanceof IDType && (string) $asInt === $serialized) { return new IntValueNode(['value' => $serialized]); } // Use json_encode, which uses the same string encoding as GraphQL, // then remove the quotes. return new StringValueNode(['value' => $serialized]); } $notConvertible = Utils::printSafe($serialized); throw new InvariantViolation("Cannot convert value to AST: {$notConvertible}"); } /** * Produces a PHP value given a Automattic\WooCommerce\Vendor\GraphQL Value AST. * * A Automattic\WooCommerce\Vendor\GraphQL type must be provided, which will be used to interpret different * Automattic\WooCommerce\Vendor\GraphQL Value literals. * * Returns `null` when the value could not be validly coerced according to * the provided type. * * | Automattic\WooCommerce\Vendor\GraphQL Value | PHP Value | * | -------------------- | ------------- | * | Input Object | Assoc Array | * | List | Array | * | Boolean | Boolean | * | String | String | * | Int / Float | Int / Float | * | Enum Value | Mixed | * | Null Value | null | * * @param (ValueNode&Node)|null $valueNode * @param array|null $variables * * @throws \Exception * * @return mixed * * @api */ public static function valueFromAST(?ValueNode $valueNode, Type $type, ?array $variables = null, ?Schema $schema = null) { $undefined = Utils::undefined(); if ($valueNode === null) { // When there is no AST, then there is also no value. // Importantly, this is different from returning the Automattic\WooCommerce\Vendor\GraphQL null value. return $undefined; } if ($type instanceof NonNull) { if ($valueNode instanceof NullValueNode) { // Invalid: intentionally return no value. return $undefined; } return self::valueFromAST($valueNode, $type->getWrappedType(), $variables, $schema); } if ($valueNode instanceof NullValueNode) { // This is explicitly returning the value null. return null; } if ($valueNode instanceof VariableNode) { $variableName = $valueNode->name->value; if ($variables === null || ! array_key_exists($variableName, $variables)) { // No valid return value. return $undefined; } // Note: This does no further checking that this variable is correct. // This assumes that this query has been validated and the variable // usage here is of the correct type. return $variables[$variableName]; } if ($type instanceof ListOfType) { $itemType = $type->getWrappedType(); if ($valueNode instanceof ListValueNode) { $coercedValues = []; $itemNodes = $valueNode->values; foreach ($itemNodes as $itemNode) { if (self::isMissingVariable($itemNode, $variables)) { // If an array contains a missing variable, it is either coerced to // null or if the item type is non-null, it considered invalid. if ($itemType instanceof NonNull) { // Invalid: intentionally return no value. return $undefined; } $coercedValues[] = null; } else { $itemValue = self::valueFromAST($itemNode, $itemType, $variables, $schema); if ($undefined === $itemValue) { // Invalid: intentionally return no value. return $undefined; } $coercedValues[] = $itemValue; } } return $coercedValues; } $coercedValue = self::valueFromAST($valueNode, $itemType, $variables, $schema); if ($undefined === $coercedValue) { // Invalid: intentionally return no value. return $undefined; } return [$coercedValue]; } if ($type instanceof InputObjectType) { if (! $valueNode instanceof ObjectValueNode) { // Invalid: intentionally return no value. return $undefined; } $coercedObj = []; $fields = $type->getFields(); $fieldNodes = []; foreach ($valueNode->fields as $field) { $fieldNodes[$field->name->value] = $field; } foreach ($fields as $field) { $fieldName = $field->name; $fieldNode = $fieldNodes[$fieldName] ?? null; if ($fieldNode === null || self::isMissingVariable($fieldNode->value, $variables)) { if ($field->defaultValueExists()) { $coercedObj[$fieldName] = $field->defaultValue; } elseif ($field->getType() instanceof NonNull) { // Invalid: intentionally return no value. return $undefined; } continue; } $fieldValue = self::valueFromAST( $fieldNode->value, $field->getType(), $variables, $schema, ); if ($undefined === $fieldValue) { // Invalid: intentionally return no value. return $undefined; } $coercedObj[$fieldName] = $fieldValue; } return $type->parseValue($coercedObj); } if ($type instanceof EnumType) { try { return $type->parseLiteral($valueNode, $variables); } catch (\Throwable $error) { return $undefined; } } assert($type instanceof ScalarType, 'only remaining option'); $typeName = $type->name; // Account for type loader returning a different scalar instance than // the built-in singleton used in field definitions. Resolve the actual // type from the schema to ensure the correct parseLiteral() is called. if ($schema !== null && Type::isBuiltInScalarName($typeName)) { $schemaType = $schema->getType($typeName); assert($schemaType instanceof ScalarType, "Schema must provide a ScalarType for built-in scalar \"{$typeName}\"."); $type = $schemaType; } // Scalars fulfill parsing a literal value via parseLiteral(). // Invalid values represent a failure to parse correctly, in which case // no value is returned. try { return $type->parseLiteral($valueNode, $variables); } catch (\Throwable $error) { return $undefined; } } /** * Returns true if the provided valueNode is a variable which is not defined * in the set of variables. * * @param ValueNode&Node $valueNode * @param array|null $variables */ private static function isMissingVariable(ValueNode $valueNode, ?array $variables): bool { return $valueNode instanceof VariableNode && ($variables === null || ! array_key_exists($valueNode->name->value, $variables)); } /** * Produces a PHP value given a Automattic\WooCommerce\Vendor\GraphQL Value AST. * * Unlike `valueFromAST()`, no type is provided. The resulting PHP value * will reflect the provided Automattic\WooCommerce\Vendor\GraphQL value AST. * * | Automattic\WooCommerce\Vendor\GraphQL Value | PHP Value | * | -------------------- | ------------- | * | Input Object | Assoc Array | * | List | Array | * | Boolean | Boolean | * | String | String | * | Int / Float | Int / Float | * | Enum | Mixed | * | Null | null | * * @param array|null $variables * * @throws \Exception * * @return mixed * * @api */ public static function valueFromASTUntyped(Node $valueNode, ?array $variables = null) { switch (true) { case $valueNode instanceof NullValueNode: return null; case $valueNode instanceof IntValueNode: return (int) $valueNode->value; case $valueNode instanceof FloatValueNode: return (float) $valueNode->value; case $valueNode instanceof StringValueNode: case $valueNode instanceof EnumValueNode: case $valueNode instanceof BooleanValueNode: return $valueNode->value; case $valueNode instanceof ListValueNode: $values = []; foreach ($valueNode->values as $node) { $values[] = self::valueFromASTUntyped($node, $variables); } return $values; case $valueNode instanceof ObjectValueNode: $values = []; foreach ($valueNode->fields as $field) { $values[$field->name->value] = self::valueFromASTUntyped($field->value, $variables); } return $values; case $valueNode instanceof VariableNode: $variableName = $valueNode->name->value; return ($variables ?? []) !== [] && isset($variables[$variableName]) ? $variables[$variableName] : null; } throw new Error("Unexpected value kind: {$valueNode->kind}"); } /** * Returns type definition for given AST Type node. * * @param callable(string): ?Type $typeLoader * @param NamedTypeNode|ListTypeNode|NonNullTypeNode $inputTypeNode * * @throws \Exception * * @api */ public static function typeFromAST(callable $typeLoader, Node $inputTypeNode): ?Type { if ($inputTypeNode instanceof ListTypeNode) { $innerType = self::typeFromAST($typeLoader, $inputTypeNode->type); return $innerType === null ? null : new ListOfType($innerType); } if ($inputTypeNode instanceof NonNullTypeNode) { $innerType = self::typeFromAST($typeLoader, $inputTypeNode->type); if ($innerType === null) { return null; } assert($innerType instanceof NullableType, 'proven by schema validation'); return new NonNull($innerType); } return $typeLoader($inputTypeNode->name->value); } /** * Returns the operation within a document by name. * * If a name is not provided, an operation is only returned if the document has exactly one. * * @api */ public static function getOperationAST(DocumentNode $document, ?string $operationName = null): ?OperationDefinitionNode { $operation = null; foreach ($document->definitions->getIterator() as $node) { if (! $node instanceof OperationDefinitionNode) { continue; } if ($operationName === null) { // We found a second operation, so we bail instead of returning an ambiguous result. if ($operation !== null) { return null; } $operation = $node; } elseif ($node->name instanceof NameNode && $node->name->value === $operationName) { return $node; } } return $operation; } /** * Provided a collection of ASTs, presumably each from different files, * concatenate the ASTs together into batched AST, useful for validating many * Automattic\WooCommerce\Vendor\GraphQL source files which together represent one conceptual application. * * @param array $documents * * @api */ public static function concatAST(array $documents): DocumentNode { /** @var array $definitions */ $definitions = []; foreach ($documents as $document) { foreach ($document->definitions as $definition) { $definitions[] = $definition; } } return new DocumentNode(['definitions' => new NodeList($definitions)]); } }