145 lines
4 KiB
Dart
145 lines
4 KiB
Dart
part of graphql_schema.src.schema;
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/// `true` or `false`.
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final GraphQLScalarType<bool, bool> graphQLBoolean = new _GraphQLBoolType();
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/// A UTF‐8 character sequence.
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final GraphQLScalarType<String, String> graphQLString =
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new _GraphQLStringType._();
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/// The ID scalar type represents a unique identifier, often used to refetch an object or as the key for a cache.
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///
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/// The ID type is serialized in the same way as a String; however, defining it as an ID signifies that it is not intended to be human‐readable.
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final GraphQLScalarType<String, String> graphQLId = new _GraphQLStringType._('ID');
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/// A [DateTime].
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final GraphQLScalarType<DateTime, String> graphQLDate =
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new _GraphQLDateType._();
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/// A signed 32‐bit integer.
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final GraphQLScalarType<int, int> graphQLInt = new _GraphQLNumType<int>(
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'Int', 'A signed 64-bit integer.', (x) => x is int, 'an integer');
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/// A signed double-precision floating-point value.
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final GraphQLScalarType<double, double> graphQLFloat =
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new _GraphQLNumType<double>(
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'Float',
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'A signed double-precision floating-point value.',
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(x) => x is double,
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'a float');
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abstract class GraphQLScalarType<Value, Serialized>
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extends GraphQLType<Value, Serialized>
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with _NonNullableMixin<Value, Serialized> {
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Type get valueType => Value;
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}
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typedef bool _NumVerifier(x);
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class _GraphQLBoolType extends GraphQLScalarType<bool, bool> {
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@override
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bool serialize(bool value) {
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return value;
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}
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@override
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String get name => 'Boolean';
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@override
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String get description => 'A boolean value; can be either true or false.';
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@override
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ValidationResult<bool> validate(String key, input) {
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if (input != null && input is! bool)
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return new ValidationResult._failure(
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['Expected "$key" to be a boolean.']);
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return new ValidationResult._ok(input);
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}
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@override
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bool deserialize(bool serialized) {
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return serialized;
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}
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}
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class _GraphQLNumType<T extends num> extends GraphQLScalarType<T, T> {
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final String name;
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final String description;
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final _NumVerifier verifier;
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final String expected;
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_GraphQLNumType(this.name, this.description, this.verifier, this.expected);
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@override
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ValidationResult<T> validate(String key, input) {
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if (input != null && !verifier(input))
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return new ValidationResult._failure(
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['Expected "$key" to be $expected.']);
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return new ValidationResult._ok(input);
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}
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@override
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T deserialize(T serialized) {
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return serialized;
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}
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@override
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T serialize(T value) {
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return value;
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}
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}
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class _GraphQLStringType extends GraphQLScalarType<String, String> {
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final String name;
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_GraphQLStringType._([this.name = 'String']);
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@override
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String get description => 'A character sequence.';
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@override
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String serialize(String value) => value;
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@override
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String deserialize(String serialized) => serialized;
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@override
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ValidationResult<String> validate(String key, input) =>
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input == null || input is String
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? new ValidationResult<String>._ok(input)
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: new ValidationResult._failure(['Expected "$key" to be a string.']);
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}
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class _GraphQLDateType extends GraphQLScalarType<DateTime, String>
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with _NonNullableMixin<DateTime, String> {
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_GraphQLDateType._();
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@override
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String get name => 'Date';
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@override
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String get description => 'An ISO-8601 Date.';
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@override
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String serialize(DateTime value) => value.toIso8601String();
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@override
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DateTime deserialize(String serialized) => DateTime.parse(serialized);
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@override
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ValidationResult<String> validate(String key, input) {
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if (input != null && input is! String)
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return new ValidationResult<String>._failure(
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['$key must be an ISO 8601-formatted date string.']);
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else if (input == null) return new ValidationResult<String>._ok(input);
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try {
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DateTime.parse(input);
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return new ValidationResult<String>._ok(input);
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} on FormatException {
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return new ValidationResult<String>._failure(
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['$key must be an ISO 8601-formatted date string.']);
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}
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}
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}
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