/[pcre]/code/tags/pcre-6.1/pcre_stringpiece.h.in
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Contents of /code/tags/pcre-6.1/pcre_stringpiece.h.in

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Revision 80 - (show annotations) (download)
Sat Feb 24 21:40:54 2007 UTC (7 years, 5 months ago) by nigel
File size: 6088 byte(s)
Tag code/trunk as code/tags/pcre-6.1.

1 // Copyright (c) 2005, Google Inc.
2 // All rights reserved.
3 //
4 // Redistribution and use in source and binary forms, with or without
5 // modification, are permitted provided that the following conditions are
6 // met:
7 //
8 // * Redistributions of source code must retain the above copyright
9 // notice, this list of conditions and the following disclaimer.
10 // * Redistributions in binary form must reproduce the above
11 // copyright notice, this list of conditions and the following disclaimer
12 // in the documentation and/or other materials provided with the
13 // distribution.
14 // * Neither the name of Google Inc. nor the names of its
15 // contributors may be used to endorse or promote products derived from
16 // this software without specific prior written permission.
17 //
18 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
21 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
22 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
23 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
24 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
28 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 //
30 // Author: Sanjay Ghemawat
31 //
32 // A string like object that points into another piece of memory.
33 // Useful for providing an interface that allows clients to easily
34 // pass in either a "const char*" or a "string".
35 //
36 // Arghh! I wish C++ literals were automatically of type "string".
37
38 #ifndef _PCRE_STRINGPIECE_H
39 #define _PCRE_STRINGPIECE_H
40
41 #include <string.h>
42 #include <string>
43 #include <iosfwd> // for ostream forward-declaration
44
45 #if @pcre_has_type_traits@
46 #define HAVE_TYPE_TRAITS
47 #include <type_traits.h>
48 #elif @pcre_has_bits_type_traits@
49 #define HAVE_TYPE_TRAITS
50 #include <bits/type_traits.h>
51 #endif
52
53 using std::string;
54
55 namespace pcrecpp {
56
57 class StringPiece {
58 private:
59 const char* ptr_;
60 int length_;
61
62 public:
63 // We provide non-explicit singleton constructors so users can pass
64 // in a "const char*" or a "string" wherever a "StringPiece" is
65 // expected.
66 StringPiece()
67 : ptr_(NULL), length_(0) { }
68 StringPiece(const char* str)
69 : ptr_(str), length_(static_cast<int>(strlen(str))) { }
70 StringPiece(const string& str)
71 : ptr_(str.data()), length_(static_cast<int>(str.size())) { }
72 StringPiece(const char* offset, int len)
73 : ptr_(offset), length_(len) { }
74
75 // data() may return a pointer to a buffer with embedded NULs, and the
76 // returned buffer may or may not be null terminated. Therefore it is
77 // typically a mistake to pass data() to a routine that expects a NUL
78 // terminated string. Use "as_string().c_str()" if you really need to do
79 // this. Or better yet, change your routine so it does not rely on NUL
80 // termination.
81 const char* data() const { return ptr_; }
82 int size() const { return length_; }
83 bool empty() const { return length_ == 0; }
84
85 void clear() { ptr_ = NULL; length_ = 0; }
86 void set(const char* buffer, int len) { ptr_ = buffer; length_ = len; }
87 void set(const char* str) {
88 ptr_ = str;
89 length_ = static_cast<int>(strlen(str));
90 }
91 void set(const void* buffer, int len) {
92 ptr_ = reinterpret_cast<const char*>(buffer);
93 length_ = len;
94 }
95
96 char operator[](int i) const { return ptr_[i]; }
97
98 void remove_prefix(int n) {
99 ptr_ += n;
100 length_ -= n;
101 }
102
103 void remove_suffix(int n) {
104 length_ -= n;
105 }
106
107 bool operator==(const StringPiece& x) const {
108 return ((length_ == x.length_) &&
109 (memcmp(ptr_, x.ptr_, length_) == 0));
110 }
111 bool operator!=(const StringPiece& x) const {
112 return !(*this == x);
113 }
114
115 #define STRINGPIECE_BINARY_PREDICATE(cmp,auxcmp) \
116 bool operator cmp (const StringPiece& x) const { \
117 int r = memcmp(ptr_, x.ptr_, length_ < x.length_ ? length_ : x.length_); \
118 return ((r auxcmp 0) || ((r == 0) && (length_ cmp x.length_))); \
119 }
120 STRINGPIECE_BINARY_PREDICATE(<, <);
121 STRINGPIECE_BINARY_PREDICATE(<=, <);
122 STRINGPIECE_BINARY_PREDICATE(>=, >);
123 STRINGPIECE_BINARY_PREDICATE(>, >);
124 #undef STRINGPIECE_BINARY_PREDICATE
125
126 int compare(const StringPiece& x) const {
127 int r = memcmp(ptr_, x.ptr_, length_ < x.length_ ? length_ : x.length_);
128 if (r == 0) {
129 if (length_ < x.length_) r = -1;
130 else if (length_ > x.length_) r = +1;
131 }
132 return r;
133 }
134
135 string as_string() const {
136 return string(data(), size());
137 }
138
139 void CopyToString(string* target) const {
140 target->assign(ptr_, length_);
141 }
142
143 // Does "this" start with "x"
144 bool starts_with(const StringPiece& x) const {
145 return ((length_ >= x.length_) && (memcmp(ptr_, x.ptr_, x.length_) == 0));
146 }
147 };
148
149 } // namespace pcrecpp
150
151 // ------------------------------------------------------------------
152 // Functions used to create STL containers that use StringPiece
153 // Remember that a StringPiece's lifetime had better be less than
154 // that of the underlying string or char*. If it is not, then you
155 // cannot safely store a StringPiece into an STL container
156 // ------------------------------------------------------------------
157
158 #ifdef HAVE_TYPE_TRAITS
159 // This makes vector<StringPiece> really fast for some STL implementations
160 template<> struct __type_traits<pcrecpp::StringPiece> {
161 typedef __true_type has_trivial_default_constructor;
162 typedef __true_type has_trivial_copy_constructor;
163 typedef __true_type has_trivial_assignment_operator;
164 typedef __true_type has_trivial_destructor;
165 typedef __true_type is_POD_type;
166 };
167 #endif
168
169 // allow StringPiece to be logged
170 std::ostream& operator<<(std::ostream& o, const pcrecpp::StringPiece& piece);
171
172 #endif /* _PCRE_STRINGPIECE_H */

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