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Side by Side Diff: pkg/front_end/test/fasta/parser/token_stream_rewriter_test.dart

Issue 2970983003: modifiy insertTokenBefore to return the inserted token (Closed)
Patch Set: Created 3 years, 5 months ago
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1 // Copyright (c) 2017, the Dart project authors. Please see the AUTHORS file 1 // Copyright (c) 2017, the Dart project authors. Please see the AUTHORS file
2 // for details. All rights reserved. Use of this source code is governed by a 2 // for details. All rights reserved. Use of this source code is governed by a
3 // BSD-style license that can be found in the LICENSE file. 3 // BSD-style license that can be found in the LICENSE file.
4 4
5 import 'package:front_end/src/fasta/parser/token_stream_rewriter.dart'; 5 import 'package:front_end/src/fasta/parser/token_stream_rewriter.dart';
6 import 'package:front_end/src/fasta/scanner/token.dart'; 6 import 'package:front_end/src/fasta/scanner/token.dart';
7 import 'package:front_end/src/scanner/token.dart' 7 import 'package:front_end/src/scanner/token.dart'
8 show BeginToken, Token, TokenType; 8 show BeginToken, Token, TokenType;
9 import 'package:test/test.dart'; 9 import 'package:test/test.dart';
10 import 'package:test_reflective_loader/test_reflective_loader.dart'; 10 import 'package:test_reflective_loader/test_reflective_loader.dart';
11 11
12 main() { 12 main() {
13 defineReflectiveSuite(() { 13 defineReflectiveSuite(() {
14 defineReflectiveTests(TokenStreamRewriterTest_NoPrevious); 14 defineReflectiveTests(TokenStreamRewriterTest_NoPrevious);
15 defineReflectiveTests(TokenStreamRewriterTest_UsingPrevious); 15 defineReflectiveTests(TokenStreamRewriterTest_UsingPrevious);
16 }); 16 });
17 } 17 }
18 18
19 /// Abstract base class for tests of [TokenStreamRewriter]. 19 /// Abstract base class for tests of [TokenStreamRewriter].
20 abstract class TokenStreamRewriterTest { 20 abstract class TokenStreamRewriterTest {
21 /// Indicates whether the tests should set up [Token.previous]. 21 /// Indicates whether the tests should set up [Token.previous].
22 bool get setPrevious; 22 bool get setPrevious;
23 23
24 void test_insert_at_end() { 24 void test_insert_at_end() {
25 var a = _makeToken(0, 'a'); 25 var a = _makeToken(0, 'a');
26 var b = _makeToken(1, 'b'); 26 var b = _makeToken(1, 'b');
27 var eof = _link([a]); 27 var eof = _link([a]);
28 var rewriter = new TokenStreamRewriter(a); 28 var rewriter = new TokenStreamRewriter(a);
29 rewriter.insertTokenBefore(b, eof); 29 expect(rewriter.insertTokenBefore(b, eof), same(b));
30 expect(rewriter.firstToken, same(a)); 30 expect(rewriter.firstToken, same(a));
31 expect(a.next, same(b)); 31 expect(a.next, same(b));
32 expect(b.next, same(eof)); 32 expect(b.next, same(eof));
33 expect(eof.previous, same(b)); 33 expect(eof.previous, same(b));
34 expect(b.previous, same(a)); 34 expect(b.previous, same(a));
35 } 35 }
36 36
37 void test_insert_at_start() { 37 void test_insert_at_start() {
38 var a = _makeToken(0, 'a'); 38 var a = _makeToken(0, 'a');
39 var b = _makeToken(1, 'b'); 39 var b = _makeToken(1, 'b');
40 _link([b]); 40 _link([b]);
41 var rewriter = new TokenStreamRewriter(b); 41 var rewriter = new TokenStreamRewriter(b);
42 rewriter.insertTokenBefore(a, b); 42 expect(rewriter.insertTokenBefore(a, b), same(a));
43 expect(rewriter.firstToken, same(a)); 43 expect(rewriter.firstToken, same(a));
44 expect(a.next, same(b)); 44 expect(a.next, same(b));
45 expect(a.previous.next, same(a)); 45 expect(a.previous.next, same(a));
46 expect(b.previous, same(a)); 46 expect(b.previous, same(a));
47 } 47 }
48 48
49 void test_resume_at_previous_insertion_point() { 49 void test_resume_at_previous_insertion_point() {
50 var a = _makeToken(0, 'a'); 50 var a = _makeToken(0, 'a');
51 var b = _makeToken(1, 'b'); 51 var b = _makeToken(1, 'b');
52 var c = _makeToken(2, 'c'); 52 var c = _makeToken(2, 'c');
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143 /// Concrete implementation of [TokenStreamRewriterTest] in which 143 /// Concrete implementation of [TokenStreamRewriterTest] in which
144 /// [Token.previous] values are set to non-null. 144 /// [Token.previous] values are set to non-null.
145 /// 145 ///
146 /// Since [TokenStreamRewriter] makes use of [Token.previous] when it can, 146 /// Since [TokenStreamRewriter] makes use of [Token.previous] when it can,
147 /// these tests do not exercise the more complex heuristics for finding previous 147 /// these tests do not exercise the more complex heuristics for finding previous
148 /// tokens. 148 /// tokens.
149 @reflectiveTest 149 @reflectiveTest
150 class TokenStreamRewriterTest_UsingPrevious extends TokenStreamRewriterTest { 150 class TokenStreamRewriterTest_UsingPrevious extends TokenStreamRewriterTest {
151 bool get setPrevious => true; 151 bool get setPrevious => true;
152 } 152 }
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