PHP Type::getFields方法代码示例

 /**
  * Not exactly the same as the executor's definition of getFieldDef, in this
  * statically evaluated environment we do not always have an Object type,
  * and need to handle Interface and Union types.
  *
  * @return FieldDefinition
  */
 private static function _getFieldDef(Schema $schema, Type $parentType, Field $fieldAST)
 {
     $name = $fieldAST->name->value;
     $schemaMeta = Introspection::schemaMetaFieldDef();
     if ($name === $schemaMeta->name && $schema->getQueryType() === $parentType) {
         return $schemaMeta;
     }
     $typeMeta = Introspection::typeMetaFieldDef();
     if ($name === $typeMeta->name && $schema->getQueryType() === $parentType) {
         return $typeMeta;
     }
     $typeNameMeta = Introspection::typeNameMetaFieldDef();
     if ($name === $typeNameMeta->name && ($parentType instanceof ObjectType || $parentType instanceof InterfaceType || $parentType instanceof UnionType)) {
         return $typeNameMeta;
     }
     if ($parentType instanceof ObjectType || $parentType instanceof InterfaceType) {
         $fields = $parentType->getFields();
         return isset($fields[$name]) ? $fields[$name] : null;
     }
     return null;
 }

 /**
  * Given a type and any value, return a runtime value coerced to match the type.
  */
 private static function coerceValue(Type $type, $value)
 {
     if ($type instanceof NonNull) {
         // Note: we're not checking that the result of coerceValue is non-null.
         // We only call this function after calling isValidValue.
         return self::coerceValue($type->getWrappedType(), $value);
     }
     if (null === $value) {
         return null;
     }
     if ($type instanceof ListOfType) {
         $itemType = $type->getWrappedType();
         // TODO: support iterable input
         if (is_array($value)) {
             return array_map(function ($item) use($itemType) {
                 return Values::coerceValue($itemType, $item);
             }, $value);
         } else {
             return [self::coerceValue($itemType, $value)];
         }
     }
     if ($type instanceof InputObjectType) {
         $fields = $type->getFields();
         $obj = [];
         foreach ($fields as $fieldName => $field) {
             $fieldValue = self::coerceValue($field->getType(), isset($value[$fieldName]) ? $value[$fieldName] : null);
             if (null === $fieldValue) {
                 $fieldValue = $field->defaultValue;
             }
             if (null !== $fieldValue) {
                 $obj[$fieldName] = $fieldValue;
             }
         }
         return $obj;
     }
     Utils::invariant($type instanceof ScalarType || $type instanceof EnumType, 'Must be input type');
     return $type->parseValue($value);
 }

 /**
  * Check if value is valid using GraphQL Type
  *
  * @param array      $value
  * @param Type $type
  *
  * @return boolean
  */
 private function isValidValue($value, Type $type)
 {
     if ($type instanceof NonNull) {
         if (null === $value) {
             return false;
         }
         return $this->isValidValue($value, $type->getWrappedType());
     }
     if ($value === null) {
         return true;
     }
     if ($type instanceof ListOfType) {
         $itemType = $type->getWrappedType();
         if (is_array($value)) {
             foreach ($value as $item) {
                 if (!$this->isValidValue($item, $itemType)) {
                     return false;
                 }
             }
             return true;
         } else {
             return $this->isValidValue($value, $itemType);
         }
     }
     if ($type instanceof InputObjectType) {
         if (!is_array($value)) {
             return false;
         }
         $fields = $type->getFields();
         $fieldMap = [];
         foreach ($fields as $fieldName => $field) {
             if (!$this->isValidValue(isset($value[$fieldName]) ? $value[$fieldName] : null, $field->getType())) {
                 return false;
             }
             $fieldMap[$field->name] = $field;
         }
         $diff = array_diff_key($value, $fieldMap);
         if (!empty($diff)) {
             return false;
         }
         return true;
     }
     Utils::invariant($type instanceof ScalarType || $type instanceof EnumType, 'Must be input type');
     return null !== $type->parseValue($value);
 }

 static function isValidLiteralValue($valueAST, Type $type)
 {
     // A value can only be not provided if the type is nullable.
     if (!$valueAST) {
         return !$type instanceof NonNull;
     }
     // Unwrap non-null.
     if ($type instanceof NonNull) {
         return self::isValidLiteralValue($valueAST, $type->getWrappedType());
     }
     // This function only tests literals, and assumes variables will provide
     // values of the correct type.
     if ($valueAST instanceof Variable) {
         return true;
     }
     if (!$valueAST instanceof Value) {
         return false;
     }
     // Lists accept a non-list value as a list of one.
     if ($type instanceof ListOfType) {
         $itemType = $type->getWrappedType();
         if ($valueAST instanceof ListValue) {
             foreach ($valueAST->values as $itemAST) {
                 if (!self::isValidLiteralValue($itemAST, $itemType)) {
                     return false;
                 }
             }
             return true;
         } else {
             return self::isValidLiteralValue($valueAST, $itemType);
         }
     }
     // Scalar/Enum input checks to ensure the type can serialize the value to
     // a non-null value.
     if ($type instanceof ScalarType || $type instanceof EnumType) {
         return $type->parseLiteral($valueAST) !== null;
     }
     // Input objects check each defined field, ensuring it is of the correct
     // type and provided if non-nullable.
     if ($type instanceof InputObjectType) {
         $fields = $type->getFields();
         if ($valueAST->kind !== Node::OBJECT) {
             return false;
         }
         $fieldASTs = $valueAST->fields;
         $fieldASTMap = Utils::keyMap($fieldASTs, function ($field) {
             return $field->name->value;
         });
         foreach ($fields as $fieldKey => $field) {
             $fieldName = $field->name ?: $fieldKey;
             if (!isset($fieldASTMap[$fieldName]) && $field->getType() instanceof NonNull) {
                 // Required fields missing
                 return false;
             }
         }
         foreach ($fieldASTs as $fieldAST) {
             if (empty($fields[$fieldAST->name->value]) || !self::isValidLiteralValue($fieldAST->value, $fields[$fieldAST->name->value]->getType())) {
                 return false;
             }
         }
         return true;
     }
     // Any other kind of type is not an input type, and a literal cannot be used.
     return false;
 }

 /**
  * Given a type and a value AST node known to match this type, build a
  * runtime value.
  */
 private static function coerceValueAST(Type $type, $valueAST, $variables)
 {
     if ($type instanceof NonNull) {
         // Note: we're not checking that the result of coerceValueAST is non-null.
         // We're assuming that this query has been validated and the value used
         // here is of the correct type.
         return self::coerceValueAST($type->getWrappedType(), $valueAST, $variables);
     }
     if (!$valueAST) {
         return null;
     }
     if ($valueAST->kind === Node::VARIABLE) {
         $variableName = $valueAST->name->value;
         if (!isset($variables, $variables[$variableName])) {
             return null;
         }
         // Note: we're not doing any checking that this variable is correct. We're
         // assuming that this query has been validated and the variable usage here
         // is of the correct type.
         return $variables[$variableName];
     }
     if ($type instanceof ListOfType) {
         $itemType = $type->getWrappedType();
         if ($valueAST->kind === Node::ARR) {
             $tmp = [];
             foreach ($valueAST->values as $itemAST) {
                 $tmp[] = self::coerceValueAST($itemType, $itemAST, $variables);
             }
             return $tmp;
         } else {
             return [self::coerceValueAST($itemType, $valueAST, $variables)];
         }
     }
     if ($type instanceof InputObjectType) {
         $fields = $type->getFields();
         if ($valueAST->kind !== Node::OBJECT) {
             return null;
         }
         $fieldASTs = Utils::keyMap($valueAST->fields, function ($field) {
             return $field->name->value;
         });
         $obj = [];
         foreach ($fields as $fieldName => $field) {
             $fieldAST = $fieldASTs[$fieldName];
             $fieldValue = self::coerceValueAST($field->getType(), $fieldAST ? $fieldAST->value : null, $variables);
             $obj[$fieldName] = $fieldValue === null ? $field->defaultValue : $fieldValue;
         }
         return $obj;
     }
     if ($type instanceof ScalarType || $type instanceof EnumType) {
         $coerced = $type->coerceLiteral($valueAST);
         if (null !== $coerced) {
             return $coerced;
         }
     }
     return null;
 }

 /**
  * Given a type and any value, return a runtime value coerced to match the type.
  */
 private static function coerceValue(Type $type, $value)
 {
     $undefined = Utils::undefined();
     if ($value === $undefined) {
         return $undefined;
     }
     if ($type instanceof NonNull) {
         if ($value === null) {
             // Intentionally return no value.
             return $undefined;
         }
         return self::coerceValue($type->getWrappedType(), $value);
     }
     if (null === $value) {
         return null;
     }
     if ($type instanceof ListOfType) {
         $itemType = $type->getWrappedType();
         if (is_array($value) || $value instanceof \Traversable) {
             $coercedValues = [];
             foreach ($value as $item) {
                 $itemValue = self::coerceValue($itemType, $item);
                 if ($undefined === $itemValue) {
                     // Intentionally return no value.
                     return $undefined;
                 }
                 $coercedValues[] = $itemValue;
             }
             return $coercedValues;
         } else {
             $coercedValue = self::coerceValue($itemType, $value);
             if ($coercedValue === $undefined) {
                 // Intentionally return no value.
                 return $undefined;
             }
             return [$coercedValue];
         }
     }
     if ($type instanceof InputObjectType) {
         $coercedObj = [];
         $fields = $type->getFields();
         foreach ($fields as $fieldName => $field) {
             if (!array_key_exists($fieldName, $value)) {
                 if ($field->defaultValueExists()) {
                     $coercedObj[$fieldName] = $field->defaultValue;
                 } else {
                     if ($field->getType() instanceof NonNull) {
                         // Intentionally return no value.
                         return $undefined;
                     }
                 }
                 continue;
             }
             $fieldValue = self::coerceValue($field->getType(), $value[$fieldName]);
             if ($fieldValue === $undefined) {
                 // Intentionally return no value.
                 return $undefined;
             }
             $coercedObj[$fieldName] = $fieldValue;
         }
         return $coercedObj;
     }
     if ($type instanceof LeafType) {
         $parsed = $type->parseValue($value);
         if (null === $parsed) {
             // null or invalid values represent a failure to parse correctly,
             // in which case no value is returned.
             return $undefined;
         }
         return $parsed;
     }
     throw new InvariantViolation('Must be input type');
 }

 /**
  * Given a type and any value, return a runtime value coerced to match the type.
  */
 private static function coerceValue(Type $type, $value)
 {
     if ($type instanceof NonNull) {
         // Note: we're not checking that the result of coerceValue is non-null.
         // We only call this function after calling isValidPHPValue.
         return self::coerceValue($type->getWrappedType(), $value);
     }
     if (null === $value) {
         return null;
     }
     if ($type instanceof ListOfType) {
         $itemType = $type->getWrappedType();
         if (is_array($value) || $value instanceof \Traversable) {
             return Utils::map($value, function ($item) use($itemType) {
                 return Values::coerceValue($itemType, $item);
             });
         } else {
             return [self::coerceValue($itemType, $value)];
         }
     }
     if ($type instanceof InputObjectType) {
         $fields = $type->getFields();
         $obj = [];
         foreach ($fields as $fieldName => $field) {
             $fieldValue = self::coerceValue($field->getType(), isset($value[$fieldName]) ? $value[$fieldName] : null);
             if (null === $fieldValue) {
                 $fieldValue = $field->defaultValue;
             }
             if (null !== $fieldValue) {
                 $obj[$fieldName] = $fieldValue;
             }
         }
         return $obj;
     }
     if ($type instanceof LeafType) {
         return $type->parseValue($value);
     }
     throw new InvariantViolation('Must be input type');
 }

 /**
  * Utility for validators which determines if a value literal AST is valid given
  * an input type.
  *
  * Note that this only validates literal values, variables are assumed to
  * provide values of the correct type.
  *
  * @return array
  */
 public static function isValidLiteralValue(Type $type, $valueAST)
 {
     // A value must be provided if the type is non-null.
     if ($type instanceof NonNull) {
         $wrappedType = $type->getWrappedType();
         if (!$valueAST) {
             if ($wrappedType->name) {
                 return ["Expected \"{$wrappedType->name}!\", found null."];
             }
             return ['Expected non-null value, found null.'];
         }
         return static::isValidLiteralValue($wrappedType, $valueAST);
     }
     if (!$valueAST) {
         return [];
     }
     // This function only tests literals, and assumes variables will provide
     // values of the correct type.
     if ($valueAST instanceof Variable) {
         return [];
     }
     // Lists accept a non-list value as a list of one.
     if ($type instanceof ListOfType) {
         $itemType = $type->getWrappedType();
         if ($valueAST instanceof ListValue) {
             $errors = [];
             foreach ($valueAST->values as $index => $itemAST) {
                 $tmp = static::isValidLiteralValue($itemType, $itemAST);
                 if ($tmp) {
                     $errors = array_merge($errors, Utils::map($tmp, function ($error) use($index) {
                         return "In element #{$index}: {$error}";
                     }));
                 }
             }
             return $errors;
         } else {
             return static::isValidLiteralValue($itemType, $valueAST);
         }
     }
     // Input objects check each defined field and look for undefined fields.
     if ($type instanceof InputObjectType) {
         if ($valueAST->kind !== Node::OBJECT) {
             return ["Expected \"{$type->name}\", found not an object."];
         }
         $fields = $type->getFields();
         $errors = [];
         // Ensure every provided field is defined.
         $fieldASTs = $valueAST->fields;
         foreach ($fieldASTs as $providedFieldAST) {
             if (empty($fields[$providedFieldAST->name->value])) {
                 $errors[] = "In field \"{$providedFieldAST->name->value}\": Unknown field.";
             }
         }
         // Ensure every defined field is valid.
         $fieldASTMap = Utils::keyMap($fieldASTs, function ($fieldAST) {
             return $fieldAST->name->value;
         });
         foreach ($fields as $fieldName => $field) {
             $result = static::isValidLiteralValue($field->getType(), isset($fieldASTMap[$fieldName]) ? $fieldASTMap[$fieldName]->value : null);
             if ($result) {
                 $errors = array_merge($errors, Utils::map($result, function ($error) use($fieldName) {
                     return "In field \"{$fieldName}\": {$error}";
                 }));
             }
         }
         return $errors;
     }
     if ($type instanceof LeafType) {
         // Scalar/Enum input checks to ensure the type can parse the value to
         // a non-null value.
         $parseResult = $type->parseLiteral($valueAST);
         if (null === $parseResult) {
             $printed = Printer::doPrint($valueAST);
             return ["Expected type \"{$type->name}\", found {$printed}."];
         }
         return [];
     }
     throw new InvariantViolation('Must be input type');
 }