platform/graphql_parser

graphql_parser

Parses GraphQL queries and schemas.

This library is merely a parser/visitor. Any sort of actual GraphQL API functionality must be implemented by you, or by a third-party package.

Angel framework users should consider package:angel_graphql as a dead-simple way to add GraphQL functionality to their servers.

Installation

Add graphql_parser as a dependency in your pubspec.yaml file:

dependencies:
  graphql_parser: ^1.0.0

Usage

The AST featured in this library was originally directly based off this ANTLR4 grammar created by Joseph T. McBride: https://github.com/antlr/grammars-v4/blob/master/graphql/GraphQL.g4

It has since been updated to reflect upon the grammar in the official GraphQL specification ( June 2018).

import 'package:graphql_parser/graphql_parser.dart';

doSomething(String text) {
  var tokens = scan(text);
  var parser = new Parser(tokens);
  
  if (parser.errors.isNotEmpty) {
    // Handle errors...
  }
  
  // Parse the GraphQL document using recursive descent
  var doc = parser.parseDocument();
  
  // Do something with the parsed GraphQL document...
}