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1 // Copyright (c) 2011 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2011 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 // Copied from strings/stringpiece.h with modifications | 4 // Copied from strings/stringpiece.h with modifications |
5 // | 5 // |
6 // A string-like object that points to a sized piece of memory. | 6 // A string-like object that points to a sized piece of memory. |
7 // | 7 // |
8 // Functions or methods may use const StringPiece& parameters to accept either | 8 // Functions or methods may use const StringPiece& parameters to accept either |
9 // a "const char*" or a "string" value that will be implicitly converted to | 9 // a "const char*" or a "string" value that will be implicitly converted to |
10 // a StringPiece. The implicit conversion means that it is often appropriate | 10 // a StringPiece. The implicit conversion means that it is often appropriate |
11 // to include this .h file in other files rather than forward-declaring | 11 // to include this .h file in other files rather than forward-declaring |
12 // StringPiece as would be appropriate for most other Google classes. | 12 // StringPiece as would be appropriate for most other Google classes. |
13 // | 13 // |
14 // Systematic usage of StringPiece is encouraged as it will reduce unnecessary | 14 // Systematic usage of StringPiece is encouraged as it will reduce unnecessary |
15 // conversions from "const char*" to "string" and back again. | 15 // conversions from "const char*" to "string" and back again. |
16 // | 16 // |
17 | 17 |
18 #ifndef BASE_STRING_PIECE_H_ | 18 #ifndef BASE_STRING_PIECE_H_ |
19 #define BASE_STRING_PIECE_H_ | 19 #define BASE_STRING_PIECE_H_ |
20 #pragma once | 20 #pragma once |
21 | 21 |
22 #include <algorithm> | |
23 #include <iosfwd> | |
24 #include <string> | 22 #include <string> |
25 | 23 |
26 #include "base/basictypes.h" | 24 #include "base/basictypes.h" |
27 | 25 |
28 namespace base { | 26 namespace base { |
29 | 27 |
30 class StringPiece { | 28 class StringPiece { |
31 public: | 29 public: |
32 // standard STL container boilerplate | 30 // standard STL container boilerplate |
33 typedef size_t size_type; | 31 typedef size_t size_type; |
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86 void remove_prefix(size_type n) { | 84 void remove_prefix(size_type n) { |
87 ptr_ += n; | 85 ptr_ += n; |
88 length_ -= n; | 86 length_ -= n; |
89 } | 87 } |
90 | 88 |
91 void remove_suffix(size_type n) { | 89 void remove_suffix(size_type n) { |
92 length_ -= n; | 90 length_ -= n; |
93 } | 91 } |
94 | 92 |
95 int compare(const StringPiece& x) const { | 93 int compare(const StringPiece& x) const { |
96 int r = wordmemcmp(ptr_, x.ptr_, std::min(length_, x.length_)); | 94 int r = wordmemcmp( |
| 95 ptr_, x.ptr_, (length_ < x.length_ ? length_ : x.length_)); |
97 if (r == 0) { | 96 if (r == 0) { |
98 if (length_ < x.length_) r = -1; | 97 if (length_ < x.length_) r = -1; |
99 else if (length_ > x.length_) r = +1; | 98 else if (length_ > x.length_) r = +1; |
100 } | 99 } |
101 return r; | 100 return r; |
102 } | 101 } |
103 | 102 |
104 std::string as_string() const { | 103 std::string as_string() const { |
105 // std::string doesn't like to take a NULL pointer even with a 0 size. | 104 // std::string doesn't like to take a NULL pointer even with a 0 size. |
106 return std::string(!empty() ? data() : "", size()); | 105 return std::string(!empty() ? data() : "", size()); |
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164 size_type length_; | 163 size_type length_; |
165 }; | 164 }; |
166 | 165 |
167 bool operator==(const StringPiece& x, const StringPiece& y); | 166 bool operator==(const StringPiece& x, const StringPiece& y); |
168 | 167 |
169 inline bool operator!=(const StringPiece& x, const StringPiece& y) { | 168 inline bool operator!=(const StringPiece& x, const StringPiece& y) { |
170 return !(x == y); | 169 return !(x == y); |
171 } | 170 } |
172 | 171 |
173 inline bool operator<(const StringPiece& x, const StringPiece& y) { | 172 inline bool operator<(const StringPiece& x, const StringPiece& y) { |
174 const int r = StringPiece::wordmemcmp(x.data(), y.data(), | 173 const int r = StringPiece::wordmemcmp( |
175 std::min(x.size(), y.size())); | 174 x.data(), y.data(), (x.size() < y.size() ? x.size() : y.size())); |
176 return ((r < 0) || ((r == 0) && (x.size() < y.size()))); | 175 return ((r < 0) || ((r == 0) && (x.size() < y.size()))); |
177 } | 176 } |
178 | 177 |
179 inline bool operator>(const StringPiece& x, const StringPiece& y) { | 178 inline bool operator>(const StringPiece& x, const StringPiece& y) { |
180 return y < x; | 179 return y < x; |
181 } | 180 } |
182 | 181 |
183 inline bool operator<=(const StringPiece& x, const StringPiece& y) { | 182 inline bool operator<=(const StringPiece& x, const StringPiece& y) { |
184 return !(x > y); | 183 return !(x > y); |
185 } | 184 } |
186 | 185 |
187 inline bool operator>=(const StringPiece& x, const StringPiece& y) { | 186 inline bool operator>=(const StringPiece& x, const StringPiece& y) { |
188 return !(x < y); | 187 return !(x < y); |
189 } | 188 } |
190 | 189 |
191 // allow StringPiece to be logged (needed for unit testing). | |
192 extern std::ostream& operator<<(std::ostream& o, const StringPiece& piece); | |
193 | |
194 } // namespace base | 190 } // namespace base |
195 | 191 |
196 #endif // BASE_STRING_PIECE_H_ | 192 #endif // BASE_STRING_PIECE_H_ |
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