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Side by Side Diff: mojo/public/cpp/bindings/string.h

Issue 814543006: Move //mojo/{public, edk} underneath //third_party (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master
Patch Set: Rebase Created 5 years, 11 months ago
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1 // Copyright 2014 The Chromium 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 MOJO_PUBLIC_CPP_BINDINGS_STRING_H_
6 #define MOJO_PUBLIC_CPP_BINDINGS_STRING_H_
7
8 #include <string>
9
10 #include "mojo/public/cpp/bindings/lib/array_internal.h"
11 #include "mojo/public/cpp/bindings/type_converter.h"
12 #include "mojo/public/cpp/environment/logging.h"
13
14 namespace mojo {
15
16 class String {
17 public:
18 typedef internal::String_Data Data_;
19
20 String() : is_null_(true) {}
21 String(const std::string& str) : value_(str), is_null_(false) {}
22 String(const char* chars) : is_null_(!chars) {
23 if (chars)
24 value_ = chars;
25 }
26 String(const char* chars, size_t num_chars)
27 : value_(chars, num_chars), is_null_(false) {}
28 String(const mojo::String& str)
29 : value_(str.value_), is_null_(str.is_null_) {}
30
31 template <size_t N>
32 String(const char chars[N])
33 : value_(chars, N - 1), is_null_(false) {}
34
35 template <typename U>
36 static String From(const U& other) {
37 return TypeConverter<String, U>::Convert(other);
38 }
39
40 template <typename U>
41 U To() const {
42 return TypeConverter<U, String>::Convert(*this);
43 }
44
45 String& operator=(const mojo::String& str) {
46 value_ = str.value_;
47 is_null_ = str.is_null_;
48 return *this;
49 }
50 String& operator=(const std::string& str) {
51 value_ = str;
52 is_null_ = false;
53 return *this;
54 }
55 String& operator=(const char* chars) {
56 is_null_ = !chars;
57 if (chars) {
58 value_ = chars;
59 } else {
60 value_.clear();
61 }
62 return *this;
63 }
64
65 void reset() {
66 value_.clear();
67 is_null_ = true;
68 }
69
70 bool is_null() const { return is_null_; }
71
72 size_t size() const { return value_.size(); }
73
74 const char* data() const { return value_.data(); }
75
76 const char& at(size_t offset) const { return value_.at(offset); }
77 const char& operator[](size_t offset) const { return value_[offset]; }
78
79 const std::string& get() const { return value_; }
80 operator const std::string&() const { return value_; }
81
82 void Swap(String* other) {
83 std::swap(is_null_, other->is_null_);
84 value_.swap(other->value_);
85 }
86
87 void Swap(std::string* other) {
88 is_null_ = false;
89 value_.swap(*other);
90 }
91
92 private:
93 typedef std::string String::*Testable;
94
95 public:
96 operator Testable() const { return is_null_ ? 0 : &String::value_; }
97
98 private:
99 std::string value_;
100 bool is_null_;
101 };
102
103 inline bool operator==(const String& a, const String& b) {
104 return a.is_null() == b.is_null() && a.get() == b.get();
105 }
106 inline bool operator==(const char* a, const String& b) {
107 return !b.is_null() && a == b.get();
108 }
109 inline bool operator==(const String& a, const char* b) {
110 return !a.is_null() && a.get() == b;
111 }
112 inline bool operator!=(const String& a, const String& b) {
113 return !(a == b);
114 }
115 inline bool operator!=(const char* a, const String& b) {
116 return !(a == b);
117 }
118 inline bool operator!=(const String& a, const char* b) {
119 return !(a == b);
120 }
121
122 inline std::ostream& operator<<(std::ostream& out, const String& s) {
123 return out << s.get();
124 }
125
126 inline bool operator<(const String& a, const String& b) {
127 if (a.is_null())
128 return !b.is_null();
129 if (b.is_null())
130 return false;
131
132 return a.get() < b.get();
133 }
134
135 // TODO(darin): Add similar variants of operator<,<=,>,>=
136
137 template <>
138 struct TypeConverter<String, std::string> {
139 static String Convert(const std::string& input) { return String(input); }
140 };
141
142 template <>
143 struct TypeConverter<std::string, String> {
144 static std::string Convert(const String& input) { return input; }
145 };
146
147 template <size_t N>
148 struct TypeConverter<String, char[N]> {
149 static String Convert(const char input[N]) {
150 MOJO_DCHECK(input);
151 return String(input, N - 1);
152 }
153 };
154
155 // Appease MSVC.
156 template <size_t N>
157 struct TypeConverter<String, const char[N]> {
158 static String Convert(const char input[N]) {
159 MOJO_DCHECK(input);
160 return String(input, N - 1);
161 }
162 };
163
164 template <>
165 struct TypeConverter<String, const char*> {
166 // |input| may be null, in which case a null String will be returned.
167 static String Convert(const char* input) { return String(input); }
168 };
169
170 } // namespace mojo
171
172 #endif // MOJO_PUBLIC_CPP_BINDINGS_STRING_H_
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