blob: 1daa0fc37066325c49ffdc3d288d2b1d0143853f [file] [log] [blame]
// Copyright (c) 2016, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
import 'package:source_span/source_span.dart';
/// A token in a boolean selector.
class Token {
/// The type of the token.
final TokenType type;
/// The span indicating where this token came from.
/// This is a [FileSpan] because the tokens are parsed from a single
/// continuous string, but the string itself isn't actually a file. It might
/// come from a statically-parsed annotation or from a parameter.
final FileSpan span;
Token(this.type, this.span);
/// A token representing an identifier.
class IdentifierToken implements Token {
final type = TokenType.identifier;
final FileSpan span;
/// The name of the identifier.
final String name;
IdentifierToken(, this.span);
String toString() => 'identifier "$name"';
/// An enumeration of types of tokens.
class TokenType {
/// A `(` character.
static const leftParen = const TokenType._("left paren");
/// A `)` character.
static const rightParen = const TokenType._("right paren");
/// A `||` sequence.
static const or = const TokenType._("or");
/// A `&&` sequence.
static const and = const TokenType._("and");
/// A `!` character.
static const not = const TokenType._("not");
/// A `?` character.
static const questionMark = const TokenType._("question mark");
/// A `:` character.
static const colon = const TokenType._("colon");
/// A named identifier.
static const identifier = const TokenType._("identifier");
/// The end of the selector.
static const endOfFile = const TokenType._("end of file");
/// The name of the token type.
final String name;
const TokenType._(;
String toString() => name;