pkg/front_end/lib/src/fasta/source/diet_parser.dart

// 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.

library fasta.diet_parser;

import '../scanner/token.dart' show BeginGroupToken, Token;

import '../parser/class_member_parser.dart' show ClassMemberParser;

import '../parser/error_kind.dart' show ErrorKind;

import '../parser/listener.dart' show Listener;

import '../parser/parser.dart' show optional;

// TODO(ahe): Move this to parser package.
class DietParser extends ClassMemberParser {
  DietParser(Listener listener, {bool asyncAwaitKeywordsEnabled: false})
      : super(listener, asyncAwaitKeywordsEnabled: asyncAwaitKeywordsEnabled);

  Token parseFormalParameters(Token token, {bool inFunctionType: false}) {
    return skipFormals(token);
  }

  Token skipFormals(Token token) {
    listener.beginOptionalFormalParameters(token);
    if (!optional('(', token)) {
      if (optional(';', token)) {
        reportRecoverableError(token, ErrorKind.ExpectedOpenParens, {});
        return token;
      }
      return reportUnrecoverableError(token, ErrorKind.UnexpectedToken);
    }
    BeginGroupToken beginGroupToken = token;
    Token endToken = beginGroupToken.endGroup;
    listener.endFormalParameters(0, token, endToken);
    return endToken.next;
  }
}