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1 // Copyright (c) 2016, the Dart project authors. Please see the AUTHORS file | 1 // Copyright (c) 2016, 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 /// A library to help transform compounds and null-aware accessors into | 5 /// A library to help transform compounds and null-aware accessors into |
6 /// let expressions. | 6 /// let expressions. |
7 | 7 |
8 import 'package:front_end/src/fasta/kernel/kernel_shadow_ast.dart' | 8 import 'package:kernel/ast.dart' hide MethodInvocation, InvalidExpression; |
| 9 |
| 10 import '../../scanner/token.dart' show Token; |
| 11 |
| 12 import '../names.dart' show equalsName, indexGetName, indexSetName; |
| 13 |
| 14 import '../problems.dart' show unhandled; |
| 15 |
| 16 import 'fasta_accessors.dart' show BuilderHelper; |
| 17 |
| 18 import 'kernel_shadow_ast.dart' |
9 show | 19 show |
10 KernelArguments, | 20 KernelArguments, |
11 KernelComplexAssignment, | 21 KernelComplexAssignment, |
12 KernelConditionalExpression, | 22 KernelConditionalExpression, |
13 KernelIllegalAssignment, | 23 KernelIllegalAssignment, |
14 KernelMethodInvocation, | 24 KernelMethodInvocation, |
15 KernelNullAwarePropertyGet, | 25 KernelNullAwarePropertyGet, |
16 KernelPropertyAssign, | 26 KernelPropertyAssign, |
17 KernelPropertyGet, | 27 KernelPropertyGet, |
18 KernelSuperMethodInvocation, | 28 KernelSuperMethodInvocation, |
19 KernelSuperPropertyGet, | 29 KernelSuperPropertyGet, |
20 KernelThisExpression, | 30 KernelThisExpression, |
21 KernelVariableDeclaration, | 31 KernelVariableDeclaration, |
22 KernelVariableGet; | 32 KernelVariableGet; |
23 | 33 |
24 import 'package:front_end/src/fasta/kernel/utils.dart' show offsetForToken; | 34 import 'utils.dart' show offsetForToken; |
25 | |
26 import 'package:front_end/src/scanner/token.dart' show Token; | |
27 | |
28 import 'package:front_end/src/fasta/kernel/fasta_accessors.dart' | |
29 show BuilderHelper; | |
30 | |
31 import 'package:kernel/ast.dart' hide MethodInvocation, InvalidExpression; | |
32 | |
33 import '../names.dart' show equalsName, indexGetName, indexSetName; | |
34 | |
35 import '../deprecated_problems.dart' show deprecated_internalProblem; | |
36 | 35 |
37 /// An [Accessor] represents a subexpression for which we can't yet build a | 36 /// An [Accessor] represents a subexpression for which we can't yet build a |
38 /// kernel [Expression] because we don't yet know the context in which it is | 37 /// kernel [Expression] because we don't yet know the context in which it is |
39 /// used. | 38 /// used. |
40 /// | 39 /// |
41 /// Once the context is known, an [Accessor] can be converted into an | 40 /// Once the context is known, an [Accessor] can be converted into an |
42 /// [Expression] by calling a "build" method. | 41 /// [Expression] by calling a "build" method. |
43 /// | 42 /// |
44 /// For example, when building a kernel representation for `a[x] = b`, after | 43 /// For example, when building a kernel representation for `a[x] = b`, after |
45 /// parsing `a[x]` but before parsing `= b`, we don't yet know whether to | 44 /// parsing `a[x]` but before parsing `= b`, we don't yet know whether to |
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171 return complexAssignment; | 170 return complexAssignment; |
172 } else { | 171 } else { |
173 return body; | 172 return body; |
174 } | 173 } |
175 } | 174 } |
176 | 175 |
177 /// Returns an [Expression] representing a compile-time error. | 176 /// Returns an [Expression] representing a compile-time error. |
178 /// | 177 /// |
179 /// At runtime, an exception will be thrown. | 178 /// At runtime, an exception will be thrown. |
180 makeInvalidRead() { | 179 makeInvalidRead() { |
181 return deprecated_internalProblem( | 180 return unhandled("compile-time error", "$runtimeType", |
182 "Unhandled compile-time error.", null, offsetForToken(token)); | 181 offsetForToken(token), helper.uri); |
183 } | 182 } |
184 | 183 |
185 /// Returns an [Expression] representing a compile-time error wrapping | 184 /// Returns an [Expression] representing a compile-time error wrapping |
186 /// [value]. | 185 /// [value]. |
187 /// | 186 /// |
188 /// At runtime, [value] will be evaluated before throwing an exception. | 187 /// At runtime, [value] will be evaluated before throwing an exception. |
189 makeInvalidWrite(Expression value) { | 188 makeInvalidWrite(Expression value) { |
190 return deprecated_internalProblem( | 189 return unhandled("compile-time error", "$runtimeType", |
191 "Unhandled compile-time error.", null, offsetForToken(token)); | 190 offsetForToken(token), helper.uri); |
192 } | 191 } |
193 | 192 |
194 /// Creates a data structure for tracking the desugaring of a complex | 193 /// Creates a data structure for tracking the desugaring of a complex |
195 /// assignment expression whose right hand side is [rhs]. | 194 /// assignment expression whose right hand side is [rhs]. |
196 KernelComplexAssignment startComplexAssignment(Expression rhs) => | 195 KernelComplexAssignment startComplexAssignment(Expression rhs) => |
197 new KernelIllegalAssignment(rhs); | 196 new KernelIllegalAssignment(rhs); |
198 } | 197 } |
199 | 198 |
200 abstract class VariableAccessor extends Accessor { | 199 abstract class VariableAccessor extends Accessor { |
201 VariableDeclaration variable; | 200 VariableDeclaration variable; |
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726 | 725 |
727 Expression buildIsNull(Expression value, int offset) { | 726 Expression buildIsNull(Expression value, int offset) { |
728 return makeBinary(value, equalsName, null, new NullLiteral(), offset: offset); | 727 return makeBinary(value, equalsName, null, new NullLiteral(), offset: offset); |
729 } | 728 } |
730 | 729 |
731 VariableDeclaration makeOrReuseVariable(Expression value) { | 730 VariableDeclaration makeOrReuseVariable(Expression value) { |
732 // TODO: Devise a way to remember if a variable declaration was reused | 731 // TODO: Devise a way to remember if a variable declaration was reused |
733 // or is fresh (hence needs a let binding). | 732 // or is fresh (hence needs a let binding). |
734 return new VariableDeclaration.forValue(value); | 733 return new VariableDeclaration.forValue(value); |
735 } | 734 } |
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