1 //===--- VariantValue.cpp - Polymorphic value type -*- C++ -*-===/
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 ///
10 /// \file
11 /// \brief Polymorphic value type.
12 ///
13 //===----------------------------------------------------------------------===//
14 
15 #include "clang/ASTMatchers/Dynamic/VariantValue.h"
16 
17 namespace clang {
18 namespace ast_matchers {
19 namespace dynamic {
20 
21 VariantValue::VariantValue(const VariantValue &Other) : Type(VT_Nothing) {
22   *this = Other;
23 }
24 
25 VariantValue::VariantValue(unsigned Unsigned) : Type(VT_Nothing) {
26   setUnsigned(Unsigned);
27 }
28 
29 VariantValue::VariantValue(const std::string &String) : Type(VT_Nothing) {
30   setString(String);
31 }
32 
33 VariantValue::VariantValue(const DynTypedMatcher &Matcher) : Type(VT_Nothing) {
34   setMatcher(Matcher);
35 }
36 
37 VariantValue::~VariantValue() { reset(); }
38 
39 VariantValue &VariantValue::operator=(const VariantValue &Other) {
40   if (this == &Other) return *this;
41   reset();
42   switch (Other.Type) {
43   case VT_Unsigned:
44     setUnsigned(Other.getUnsigned());
45     break;
46   case VT_String:
47     setString(Other.getString());
48     break;
49   case VT_Matcher:
50     setMatcher(Other.getMatcher());
51     break;
52   case VT_Nothing:
53     Type = VT_Nothing;
54     break;
55   }
56   return *this;
57 }
58 
59 void VariantValue::reset() {
60   switch (Type) {
61   case VT_String:
62     delete Value.String;
63     break;
64   case VT_Matcher:
65     delete Value.Matcher;
66     break;
67   // Cases that do nothing.
68   case VT_Unsigned:
69   case VT_Nothing:
70     break;
71   }
72   Type = VT_Nothing;
73 }
74 
75 bool VariantValue::isUnsigned() const {
76   return Type == VT_Unsigned;
77 }
78 
79 unsigned VariantValue::getUnsigned() const {
80   assert(isUnsigned());
81   return Value.Unsigned;
82 }
83 
84 void VariantValue::setUnsigned(unsigned NewValue) {
85   reset();
86   Type = VT_Unsigned;
87   Value.Unsigned = NewValue;
88 }
89 
90 bool VariantValue::isString() const {
91   return Type == VT_String;
92 }
93 
94 const std::string &VariantValue::getString() const {
95   assert(isString());
96   return *Value.String;
97 }
98 
99 void VariantValue::setString(const std::string &NewValue) {
100   reset();
101   Type = VT_String;
102   Value.String = new std::string(NewValue);
103 }
104 
105 bool VariantValue::isMatcher() const {
106   return Type == VT_Matcher;
107 }
108 
109 const DynTypedMatcher &VariantValue::getMatcher() const {
110   assert(isMatcher());
111   return *Value.Matcher;
112 }
113 
114 void VariantValue::setMatcher(const DynTypedMatcher &NewValue) {
115   reset();
116   Type = VT_Matcher;
117   Value.Matcher = NewValue.clone();
118 }
119 
120 void VariantValue::takeMatcher(DynTypedMatcher *NewValue) {
121   reset();
122   Type = VT_Matcher;
123   Value.Matcher = NewValue;
124 }
125 
126 } // end namespace dynamic
127 } // end namespace ast_matchers
128 } // end namespace clang
129