1 | // Copyright 2011 Google Inc. All Rights Reserved. |
2 | // |
3 | // Licensed under the Apache License, Version 2.0 (the "License"); |
4 | // you may not use this file except in compliance with the License. |
5 | // You may obtain a copy of the License at |
6 | // |
7 | // http://www.apache.org/licenses/LICENSE-2.0 |
8 | // |
9 | // Unless required by applicable law or agreed to in writing, software |
10 | // distributed under the License is distributed on an "AS IS" BASIS, |
11 | // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
12 | // See the License for the specific language governing permissions and |
13 | // limitations under the License. |
14 | |
15 | #ifndef NINJA_STRINGPIECE_H_ |
16 | #define NINJA_STRINGPIECE_H_ |
17 | |
18 | #include <string> |
19 | |
20 | #include <string.h> |
21 | |
22 | /// StringPiece represents a slice of a string whose memory is managed |
23 | /// externally. It is useful for reducing the number of std::strings |
24 | /// we need to allocate. |
25 | struct StringPiece { |
26 | typedef const char* const_iterator; |
27 | |
28 | StringPiece() : str_(NULL), len_(0) {} |
29 | |
30 | /// The constructors intentionally allow for implicit conversions. |
31 | StringPiece(const std::string& str) : str_(str.data()), len_(str.size()) {} |
32 | StringPiece(const char* str) : str_(str), len_(strlen(str)) {} |
33 | |
34 | StringPiece(const char* str, size_t len) : str_(str), len_(len) {} |
35 | |
36 | bool operator==(const StringPiece& other) const { |
37 | return len_ == other.len_ && memcmp(str_, other.str_, len_) == 0; |
38 | } |
39 | |
40 | bool operator!=(const StringPiece& other) const { |
41 | return !(*this == other); |
42 | } |
43 | |
44 | /// Convert the slice into a full-fledged std::string, copying the |
45 | /// data into a new string. |
46 | std::string AsString() const { |
47 | return len_ ? std::string(str_, len_) : std::string(); |
48 | } |
49 | |
50 | const_iterator begin() const { |
51 | return str_; |
52 | } |
53 | |
54 | const_iterator end() const { |
55 | return str_ + len_; |
56 | } |
57 | |
58 | char operator[](size_t pos) const { |
59 | return str_[pos]; |
60 | } |
61 | |
62 | size_t size() const { |
63 | return len_; |
64 | } |
65 | |
66 | const char* str_; |
67 | size_t len_; |
68 | }; |
69 | |
70 | #endif // NINJA_STRINGPIECE_H_ |
71 | |