MartinLRodrigues / parser

A lexer and parser for GraphQL in .NET

GraphQL Dotnet Parser

This library contains a lexer and parser classes as well as the complete GraphQL AST model.

Lexer

Generates token based on input text.

Usage

var lexer = new Lexer();
var token = lexer.Lex(new Source("\"str\""));

Lex method always returns the first token it finds. In this case case the result would look like following.

Parser

Parses provided GraphQL expression into AST (abstract syntax tree).

Usage

var lexer = new Lexer();
var parser = new Parser(lexer);
var ast = parser.Parse(new Source(@"
{
  field
}"));

Json representation of the resulting AST would be:

{
	"Definitions": [{
		"Directives": [],
		"Kind": 2,
		"Name": null,
		"Operation": 0,
		"SelectionSet": {
			"Kind": 5,
			"Selections": [{
				"Alias": null,
				"Arguments": [],
				"Directives": [],
				"Kind": 6,
				"Name": {
					"Kind": 0,
					"Value": "field",
					"Location": {
						"End": 50,
						"Start": 31
					}
				},
				"SelectionSet": null,
				"Location": {
					"End": 50,
					"Start": 31
				}
			}],
			"Location": {
				"End": 50,
				"Start": 13
			}
		},
		"VariableDefinitions": null,
		"Location": {
			"End": 50,
			"Start": 13
		}
	}],
	"Kind": 1,
	"Location": {
		"End": 50,
		"Start": 13
	}
}