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 #include "clang/Basic/LLVM.h"
18 
19 namespace clang {
20 namespace ast_matchers {
21 namespace dynamic {
22 
23 MatcherList::MatcherList() : List() {}
24 
25 MatcherList::MatcherList(const DynTypedMatcher &Matcher)
26     : List(1, Matcher.clone()) {}
27 
28 MatcherList::MatcherList(const MatcherList& Other) {
29   *this = Other;
30 }
31 
32 MatcherList::~MatcherList() {
33   reset();
34 }
35 
36 MatcherList &MatcherList::operator=(const MatcherList &Other) {
37   if (this == &Other) return *this;
38   reset();
39   for (size_t i = 0, e = Other.List.size(); i != e; ++i) {
40     List.push_back(Other.List[i]->clone());
41   }
42   return *this;
43 }
44 
45 void MatcherList::add(const DynTypedMatcher &Matcher) {
46   List.push_back(Matcher.clone());
47 }
48 
49 void MatcherList::reset() {
50   for (size_t i = 0, e = List.size(); i != e; ++i) {
51     delete List[i];
52   }
53   List.resize(0);
54 }
55 
56 std::string MatcherList::getTypeAsString() const {
57   std::string Inner;
58   for (size_t I = 0, E = List.size(); I != E; ++I) {
59     if (I != 0) Inner += "|";
60     Inner += List[I]->getSupportedKind().asStringRef();
61   }
62   return (Twine("Matcher<") + Inner + ">").str();
63 }
64 
65 VariantValue::VariantValue(const VariantValue &Other) : Type(VT_Nothing) {
66   *this = Other;
67 }
68 
69 VariantValue::VariantValue(unsigned Unsigned) : Type(VT_Nothing) {
70   setUnsigned(Unsigned);
71 }
72 
73 VariantValue::VariantValue(const std::string &String) : Type(VT_Nothing) {
74   setString(String);
75 }
76 
77 VariantValue::VariantValue(const DynTypedMatcher &Matcher) : Type(VT_Nothing) {
78   setMatchers(MatcherList(Matcher));
79 }
80 
81 VariantValue::VariantValue(const MatcherList &Matchers) : Type(VT_Nothing) {
82   setMatchers(Matchers);
83 }
84 
85 VariantValue::~VariantValue() { reset(); }
86 
87 VariantValue &VariantValue::operator=(const VariantValue &Other) {
88   if (this == &Other) return *this;
89   reset();
90   switch (Other.Type) {
91   case VT_Unsigned:
92     setUnsigned(Other.getUnsigned());
93     break;
94   case VT_String:
95     setString(Other.getString());
96     break;
97   case VT_Matchers:
98     setMatchers(Other.getMatchers());
99     break;
100   case VT_Nothing:
101     Type = VT_Nothing;
102     break;
103   }
104   return *this;
105 }
106 
107 void VariantValue::reset() {
108   switch (Type) {
109   case VT_String:
110     delete Value.String;
111     break;
112   case VT_Matchers:
113     delete Value.Matchers;
114     break;
115   // Cases that do nothing.
116   case VT_Unsigned:
117   case VT_Nothing:
118     break;
119   }
120   Type = VT_Nothing;
121 }
122 
123 bool VariantValue::isUnsigned() const {
124   return Type == VT_Unsigned;
125 }
126 
127 unsigned VariantValue::getUnsigned() const {
128   assert(isUnsigned());
129   return Value.Unsigned;
130 }
131 
132 void VariantValue::setUnsigned(unsigned NewValue) {
133   reset();
134   Type = VT_Unsigned;
135   Value.Unsigned = NewValue;
136 }
137 
138 bool VariantValue::isString() const {
139   return Type == VT_String;
140 }
141 
142 const std::string &VariantValue::getString() const {
143   assert(isString());
144   return *Value.String;
145 }
146 
147 void VariantValue::setString(const std::string &NewValue) {
148   reset();
149   Type = VT_String;
150   Value.String = new std::string(NewValue);
151 }
152 
153 bool VariantValue::isMatchers() const {
154   return Type == VT_Matchers;
155 }
156 
157 const MatcherList &VariantValue::getMatchers() const {
158   assert(isMatchers());
159   return *Value.Matchers;
160 }
161 
162 void VariantValue::setMatchers(const MatcherList &NewValue) {
163   reset();
164   Type = VT_Matchers;
165   Value.Matchers = new MatcherList(NewValue);
166 }
167 
168 std::string VariantValue::getTypeAsString() const {
169   switch (Type) {
170   case VT_String: return "String";
171   case VT_Matchers: return getMatchers().getTypeAsString();
172   case VT_Unsigned: return "Unsigned";
173   case VT_Nothing: return "Nothing";
174   }
175   llvm_unreachable("Invalid Type");
176 }
177 
178 } // end namespace dynamic
179 } // end namespace ast_matchers
180 } // end namespace clang
181