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Side by Side Diff: src/pattern-rewriter.h

Issue 1128043006: [destructuring] Adapting PatternRewriter to work in for-statements. (Closed) Base URL: https://chromium.googlesource.com/v8/v8.git@master
Patch Set: Rebased Created 5 years, 7 months ago
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1 // Copyright 2015 the V8 project authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 #ifndef V8_PATTERN_MATCHER_H_
6 #define V8_PATTERN_MATCHER_H_
7
8 #include "src/ast.h"
9 #include "src/parser.h"
10
11 namespace v8 {
12
13 namespace internal {
14
15 class Parser::PatternRewriter : private AstVisitor {
16 public:
17 struct DeclarationDescriptor {
18 Parser* parser;
19 Scope* declaration_scope;
20 Scope* scope;
21 int initializer_position;
22 VariableMode mode;
23 ZoneList<const AstRawString*>* names;
24 bool is_const;
25 Block* block;
26 bool needs_init;
27 int pos;
28 Token::Value init_op;
29 };
30
31 explicit PatternRewriter(const DeclarationDescriptor* decl,
32 Expression* pattern)
33 : decl_(decl),
34 pattern_(pattern),
35 current_value_(nullptr),
36 ok_(nullptr),
37 nvars_(nullptr) {}
38
39 PatternRewriter()
40 : decl_(nullptr),
41 pattern_(nullptr),
42 current_value_(nullptr),
43 ok_(nullptr),
44 nvars_(nullptr) {}
45
46 bool IsSingleVariableBinding() const;
47 const AstRawString* SingleName() const;
48
49 void DeclareAndInitializeVariables(Expression* value, int* nvars, bool* ok);
50
51 private:
52 #define DECLARE_VISIT(type) void Visit##type(v8::internal::type* node) override;
53 // Visiting functions for AST nodes make this an AstVisitor.
54 AST_NODE_LIST(DECLARE_VISIT)
55 #undef DECLARE_VISIT
56 virtual void Visit(AstNode* node) override;
57
58 void RecurseIntoSubpattern(AstNode* pattern, Expression* value) {
59 Expression* old_value = current_value_;
60 current_value_ = value;
61 pattern->Accept(this);
62 current_value_ = old_value;
63 }
64
65 AstNodeFactory* factory() const { return decl_->parser->factory(); }
66 AstValueFactory* ast_value_factory() const {
67 return decl_->parser->ast_value_factory();
68 }
69 bool inside_with() const { return decl_->parser->inside_with(); }
70 Zone* zone() const { return decl_->parser->zone(); }
71
72 const DeclarationDescriptor* decl_;
73 Expression* pattern_;
74 Expression* current_value_;
75 bool* ok_;
76 int* nvars_;
77 };
78 }
79 } // namespace v8::internal
80
81
82 #endif // V8_PATTERN_MATCHER_H_
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