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1 // Copyright (c) 2011, the Dart project authors. Please see the AUTHORS file | 1 // Copyright (c) 2011, 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 library dart_parser.class_member_parser; | 5 library dart_parser.class_member_parser; |
6 | 6 |
7 import 'package:dart_scanner/src/token.dart' show | 7 import 'package:dart_scanner/src/token.dart' show |
8 BeginGroupToken, | |
9 ErrorToken, | |
10 Token; | 8 Token; |
11 | 9 |
12 import 'package:dart_scanner/src/token_constants.dart' show | |
13 EOF_TOKEN; | |
14 | |
15 import 'listener.dart' show | 10 import 'listener.dart' show |
16 Listener; | 11 Listener; |
17 | 12 |
18 import 'error_kind.dart' show | |
19 ErrorKind; | |
20 | |
21 import 'parser.dart' show | 13 import 'parser.dart' show |
22 Parser, | 14 Parser; |
23 optional; | |
24 | 15 |
25 /// Parser similar to [TopLevelParser] but also parses class members (excluding | 16 /// Parser similar to [TopLevelParser] but also parses class members (excluding |
26 /// their bodies). | 17 /// their bodies). |
27 class ClassMemberParser extends Parser { | 18 class ClassMemberParser extends Parser { |
28 ClassMemberParser(Listener listener, | 19 ClassMemberParser(Listener listener, |
29 {bool asyncAwaitKeywordsEnabled: false, | 20 {bool asyncAwaitKeywordsEnabled: false, |
30 bool enableGenericMethodSyntax: false}) | 21 bool enableGenericMethodSyntax: false}) |
31 : super(listener, asyncAwaitKeywordsEnabled: asyncAwaitKeywordsEnabled, | 22 : super(listener, asyncAwaitKeywordsEnabled: asyncAwaitKeywordsEnabled, |
32 enableGenericMethodSyntax: enableGenericMethodSyntax); | 23 enableGenericMethodSyntax: enableGenericMethodSyntax); |
33 | 24 |
34 Token parseExpression(Token token) => skipExpression(token); | 25 Token parseExpression(Token token) => skipExpression(token); |
35 | 26 |
36 Token parseArgumentsOpt(Token token) { | 27 // This method is overridden for two reasons: |
37 // This method is overridden for two reasons: | 28 // 1. Avoid generating events for arguments. |
38 // 1. Avoid generating events for arguments. | 29 // 2. Avoid calling skip expression for each argument (which doesn't work). |
39 // 2. Avoid calling skip expression for each argument (which doesn't work). | 30 Token parseArgumentsOpt(Token token) => skipArgumentsOpt(token); |
40 listener.handleNoArguments(token); | |
41 if (optional('(', token)) { | |
42 BeginGroupToken begin = token; | |
43 return begin.endGroup.next; | |
44 } else { | |
45 return token; | |
46 } | |
47 } | |
48 | |
49 Token skipExpression(Token token) { | |
50 while (true) { | |
51 final kind = token.kind; | |
52 final value = token.stringValue; | |
53 if ((identical(kind, EOF_TOKEN)) || | |
54 (identical(value, ';')) || | |
55 (identical(value, ',')) || | |
56 (identical(value, '}')) || | |
57 (identical(value, ')')) || | |
58 (identical(value, ']'))) { | |
59 break; | |
60 } | |
61 if (identical(value, '=') || | |
62 identical(value, '?') || | |
63 identical(value, ':') || | |
64 identical(value, '??')) { | |
65 var nextValue = token.next.stringValue; | |
66 if (identical(nextValue, 'const')) { | |
67 token = token.next; | |
68 nextValue = token.next.stringValue; | |
69 } | |
70 if (identical(nextValue, '{')) { | |
71 // Handle cases like this: | |
72 // class Foo { | |
73 // var map; | |
74 // Foo() : map = {}; | |
75 // Foo.x() : map = true ? {} : {}; | |
76 // } | |
77 BeginGroupToken begin = token.next; | |
78 token = (begin.endGroup != null) ? begin.endGroup : token; | |
79 token = token.next; | |
80 continue; | |
81 } | |
82 if (identical(nextValue, '<')) { | |
83 // Handle cases like this: | |
84 // class Foo { | |
85 // var map; | |
86 // Foo() : map = <String, Foo>{}; | |
87 // Foo.x() : map = true ? <String, Foo>{} : <String, Foo>{}; | |
88 // } | |
89 BeginGroupToken begin = token.next; | |
90 token = (begin.endGroup != null) ? begin.endGroup : token; | |
91 token = token.next; | |
92 if (identical(token.stringValue, '{')) { | |
93 begin = token; | |
94 token = (begin.endGroup != null) ? begin.endGroup : token; | |
95 token = token.next; | |
96 } | |
97 continue; | |
98 } | |
99 } | |
100 if (!mayParseFunctionExpressions && identical(value, '{')) { | |
101 break; | |
102 } | |
103 if (token is BeginGroupToken) { | |
104 BeginGroupToken begin = token; | |
105 token = (begin.endGroup != null) ? begin.endGroup : token; | |
106 } else if (token is ErrorToken) { | |
107 listener.reportErrorToken(token); | |
108 } | |
109 token = token.next; | |
110 } | |
111 return token; | |
112 } | |
113 | |
114 Token skipAsyncModifier(Token token) { | |
115 String value = token.stringValue; | |
116 if (identical(value, 'async')) { | |
117 token = token.next; | |
118 value = token.stringValue; | |
119 | |
120 if (identical(value, '*')) { | |
121 token = token.next; | |
122 } | |
123 } else if (identical(value, 'sync')) { | |
124 token = token.next; | |
125 value = token.stringValue; | |
126 | |
127 if (identical(value, '*')) { | |
128 token = token.next; | |
129 } | |
130 } | |
131 return token; | |
132 } | |
133 | 31 |
134 Token parseFunctionBody(Token token, bool isExpression, bool allowAbstract) { | 32 Token parseFunctionBody(Token token, bool isExpression, bool allowAbstract) { |
135 assert(!isExpression); | 33 return skipFunctionBody(token, isExpression, allowAbstract); |
136 token = skipAsyncModifier(token); | |
137 String value = token.stringValue; | |
138 if (identical(value, ';')) { | |
139 if (!allowAbstract) { | |
140 listener.reportError(token, ErrorKind.EXPECTED_BODY); | |
141 } | |
142 listener.handleNoFunctionBody(token); | |
143 } else { | |
144 if (identical(value, '=>')) { | |
145 token = parseExpression(token.next); | |
146 expectSemicolon(token); | |
147 } else if (value == '=') { | |
148 token = parseRedirectingFactoryBody(token); | |
149 expectSemicolon(token); | |
150 } else { | |
151 token = skipBlock(token); | |
152 } | |
153 listener.skippedFunctionBody(token); | |
154 } | |
155 return token; | |
156 } | 34 } |
157 } | 35 } |
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