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| 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 | |
| 3 // BSD-style license that can be found in the LICENSE file. | |
| 4 | |
| 5 library dart2js.parser.partial; | |
| 6 | |
| 7 import '../diagnostics/messages.dart' show | |
| 8 MessageKind; | |
| 9 import '../util/characters.dart' show | |
| 10 $CLOSE_CURLY_BRACKET; | |
| 11 | |
| 12 import 'listener.dart' show | |
| 13 Listener; | |
| 14 import 'parser.dart' show | |
| 15 Parser; | |
| 16 import 'token.dart' show | |
| 17 BeginGroupToken, | |
| 18 EOF_TOKEN, | |
| 19 ErrorToken, | |
| 20 Token; | |
| 21 | |
| 22 class PartialParser extends Parser { | |
| 23 PartialParser(Listener listener) : super(listener); | |
| 24 | |
| 25 Token parseClassBody(Token token) => skipClassBody(token); | |
| 26 | |
| 27 Token fullParseClassBody(Token token) => super.parseClassBody(token); | |
| 28 | |
| 29 Token parseExpression(Token token) => skipExpression(token); | |
| 30 | |
| 31 Token parseArgumentsOpt(Token token) { | |
| 32 // This method is overridden for two reasons: | |
| 33 // 1. Avoid generating events for arguments. | |
| 34 // 2. Avoid calling skip expression for each argument (which doesn't work). | |
| 35 if (optional('(', token)) { | |
| 36 BeginGroupToken begin = token; | |
| 37 return begin.endGroup.next; | |
| 38 } else { | |
| 39 return token; | |
| 40 } | |
| 41 } | |
| 42 | |
| 43 Token skipExpression(Token token) { | |
| 44 while (true) { | |
| 45 final kind = token.kind; | |
| 46 final value = token.stringValue; | |
| 47 if ((identical(kind, EOF_TOKEN)) || | |
| 48 (identical(value, ';')) || | |
| 49 (identical(value, ',')) || | |
| 50 (identical(value, '}')) || | |
| 51 (identical(value, ')')) || | |
| 52 (identical(value, ']'))) { | |
| 53 break; | |
| 54 } | |
| 55 if (identical(value, '=') || | |
| 56 identical(value, '?') || | |
| 57 identical(value, ':')) { | |
| 58 var nextValue = token.next.stringValue; | |
| 59 if (identical(nextValue, 'const')) { | |
| 60 token = token.next; | |
| 61 nextValue = token.next.stringValue; | |
| 62 } | |
| 63 if (identical(nextValue, '{')) { | |
| 64 // Handle cases like this: | |
| 65 // class Foo { | |
| 66 // var map; | |
| 67 // Foo() : map = {}; | |
| 68 // Foo.x() : map = true ? {} : {}; | |
| 69 // } | |
| 70 BeginGroupToken begin = token.next; | |
| 71 token = (begin.endGroup != null) ? begin.endGroup : token; | |
| 72 token = token.next; | |
| 73 continue; | |
| 74 } | |
| 75 if (identical(nextValue, '<')) { | |
| 76 // Handle cases like this: | |
| 77 // class Foo { | |
| 78 // var map; | |
| 79 // Foo() : map = <String, Foo>{}; | |
| 80 // Foo.x() : map = true ? <String, Foo>{} : <String, Foo>{}; | |
| 81 // } | |
| 82 BeginGroupToken begin = token.next; | |
| 83 token = (begin.endGroup != null) ? begin.endGroup : token; | |
| 84 token = token.next; | |
| 85 if (identical(token.stringValue, '{')) { | |
| 86 begin = token; | |
| 87 token = (begin.endGroup != null) ? begin.endGroup : token; | |
| 88 token = token.next; | |
| 89 } | |
| 90 continue; | |
| 91 } | |
| 92 } | |
| 93 if (!mayParseFunctionExpressions && identical(value, '{')) { | |
| 94 break; | |
| 95 } | |
| 96 if (token is BeginGroupToken) { | |
| 97 BeginGroupToken begin = token; | |
| 98 token = (begin.endGroup != null) ? begin.endGroup : token; | |
| 99 } else if (token is ErrorToken) { | |
| 100 listener.reportErrorToken(token); | |
| 101 } | |
| 102 token = token.next; | |
| 103 } | |
| 104 return token; | |
| 105 } | |
| 106 | |
| 107 Token skipClassBody(Token token) { | |
| 108 if (!optional('{', token)) { | |
| 109 return listener.expectedClassBodyToSkip(token); | |
| 110 } | |
| 111 BeginGroupToken beginGroupToken = token; | |
| 112 Token endGroup = beginGroupToken.endGroup; | |
| 113 if (endGroup == null) { | |
| 114 return listener.unmatched(beginGroupToken); | |
| 115 } else if (!identical(endGroup.kind, $CLOSE_CURLY_BRACKET)) { | |
| 116 return listener.unmatched(beginGroupToken); | |
| 117 } | |
| 118 return endGroup; | |
| 119 } | |
| 120 | |
| 121 Token skipAsyncModifier(Token token) { | |
| 122 String value = token.stringValue; | |
| 123 if (identical(value, 'async')) { | |
| 124 token = token.next; | |
| 125 value = token.stringValue; | |
| 126 | |
| 127 if (identical(value, '*')) { | |
| 128 token = token.next; | |
| 129 } | |
| 130 } else if (identical(value, 'sync')) { | |
| 131 token = token.next; | |
| 132 value = token.stringValue; | |
| 133 | |
| 134 if (identical(value, '*')) { | |
| 135 token = token.next; | |
| 136 } | |
| 137 } | |
| 138 return token; | |
| 139 } | |
| 140 | |
| 141 Token parseFunctionBody(Token token, bool isExpression, bool allowAbstract) { | |
| 142 assert(!isExpression); | |
| 143 token = skipAsyncModifier(token); | |
| 144 String value = token.stringValue; | |
| 145 if (identical(value, ';')) { | |
| 146 if (!allowAbstract) { | |
| 147 listener.reportError(token, MessageKind.BODY_EXPECTED); | |
| 148 } | |
| 149 listener.handleNoFunctionBody(token); | |
| 150 } else { | |
| 151 if (identical(value, '=>')) { | |
| 152 token = parseExpression(token.next); | |
| 153 expectSemicolon(token); | |
| 154 } else if (value == '=') { | |
| 155 token = parseRedirectingFactoryBody(token); | |
| 156 expectSemicolon(token); | |
| 157 } else { | |
| 158 token = skipBlock(token); | |
| 159 } | |
| 160 listener.skippedFunctionBody(token); | |
| 161 } | |
| 162 return token; | |
| 163 } | |
| 164 | |
| 165 Token parseFormalParameters(Token token) => skipFormals(token); | |
| 166 | |
| 167 Token skipFormals(Token token) { | |
| 168 listener.beginOptionalFormalParameters(token); | |
| 169 if (!optional('(', token)) { | |
| 170 if (optional(';', token)) { | |
| 171 listener.recoverableError(token, "expected '('"); | |
| 172 return token; | |
| 173 } | |
| 174 return listener.unexpected(token); | |
| 175 } | |
| 176 BeginGroupToken beginGroupToken = token; | |
| 177 Token endToken = beginGroupToken.endGroup; | |
| 178 listener.endFormalParameters(0, token, endToken); | |
| 179 return endToken.next; | |
| 180 } | |
| 181 } | |
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Chromium Code Reviews
Issue 1313073007:
Move parser and token related libraries into their own subfolder. (Closed)
Base URL: https://github.com/dart-lang/sdk.git@master