PHP Utils::undefined方法代码示例

 /**
  * 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');
 }

 /**
  * Produces a PHP value given a GraphQL Value AST.
  *
  * A GraphQL type must be provided, which will be used to interpret different
  * GraphQL Value literals.
  *
  * Returns `null` when the value could not be validly coerced according to
  * the provided type.
  *
  * | GraphQL Value        | PHP Value     |
  * | -------------------- | ------------- |
  * | Input Object         | Assoc Array   |
  * | List                 | Array         |
  * | Boolean              | Boolean       |
  * | String               | String        |
  * | Int / Float          | Int / Float   |
  * | Enum Value           | Mixed         |
  * | Null Value           | stdClass      | instance of NullValue::getNullValue()
  *
  * @param $valueNode
  * @param InputType $type
  * @param null $variables
  * @return array|null|\stdClass
  * @throws \Exception
  */
 public static function valueFromAST($valueNode, InputType $type, $variables = null)
 {
     $undefined = Utils::undefined();
     if (!$valueNode) {
         // When there is no AST, then there is also no value.
         // Importantly, this is different from returning the 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(), $variables);
     }
     if ($valueNode instanceof NullValueNode) {
         // This is explicitly returning the value null.
         return null;
     }
     if ($valueNode instanceof VariableNode) {
         $variableName = $valueNode->name->value;
         if (!$variables || !array_key_exists($variableName, $variables)) {
             // No valid return value.
             return $undefined;
         }
         // 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 = $type->getWrappedType();
         if ($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, $variables);
                     if ($undefined === $itemValue) {
                         // Invalid: intentionally return no value.
                         return $undefined;
                     }
                     $coercedValues[] = $itemValue;
                 }
             }
             return $coercedValues;
         }
         $coercedValue = self::valueFromAST($valueNode, $itemType, $variables);
         if ($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();
         $fieldNodes = Utils::keyMap($valueNode->fields, function ($field) {
             return $field->name->value;
         });
         foreach ($fields as $field) {
             /** @var ValueNode $fieldNode */
             $fieldName = $field->name;
//.........这里部分代码省略.........

 /**
  * @it omits input object fields for unprovided variables
  */
 public function testOmitsInputObjectFieldsForUnprovidedVariables()
 {
     $testInputObj = $this->inputObj();
     $this->runTestCaseWithVars([], $testInputObj, '{ int: $foo, bool: $foo, requiredBool: true }', ['int' => 42, 'requiredBool' => true]);
     $this->runTestCaseWithVars([], $testInputObj, '{ requiredBool: $foo }', Utils::undefined());
     $this->runTestCaseWithVars(['foo' => true], $testInputObj, '{ requiredBool: $foo }', ['int' => 42, 'requiredBool' => true]);
 }