/[pcre]/code/tags/pcre-8.01/pcre_stringpiece.h.in
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Contents of /code/tags/pcre-8.01/pcre_stringpiece.h.in

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Revision 490 - (show annotations) (download)
Tue Jan 19 16:45:59 2010 UTC (4 years, 8 months ago) by ph10
File size: 6265 byte(s)
Tag release 8.01.

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_have_type_traits@
46 #define HAVE_TYPE_TRAITS
47 #include <type_traits.h>
48 #elif @pcre_have_bits_type_traits@
49 #define HAVE_TYPE_TRAITS
50 #include <bits/type_traits.h>
51 #endif
52
53 #include <pcre.h>
54
55 using std::string;
56
57 namespace pcrecpp {
58
59 class PCRECPP_EXP_DEFN StringPiece {
60 private:
61 const char* ptr_;
62 int length_;
63
64 public:
65 // We provide non-explicit singleton constructors so users can pass
66 // in a "const char*" or a "string" wherever a "StringPiece" is
67 // expected.
68 StringPiece()
69 : ptr_(NULL), length_(0) { }
70 StringPiece(const char* str)
71 : ptr_(str), length_(static_cast<int>(strlen(ptr_))) { }
72 StringPiece(const unsigned char* str)
73 : ptr_(reinterpret_cast<const char*>(str)),
74 length_(static_cast<int>(strlen(ptr_))) { }
75 StringPiece(const string& str)
76 : ptr_(str.data()), length_(static_cast<int>(str.size())) { }
77 StringPiece(const char* offset, int len)
78 : ptr_(offset), length_(len) { }
79
80 // data() may return a pointer to a buffer with embedded NULs, and the
81 // returned buffer may or may not be null terminated. Therefore it is
82 // typically a mistake to pass data() to a routine that expects a NUL
83 // terminated string. Use "as_string().c_str()" if you really need to do
84 // this. Or better yet, change your routine so it does not rely on NUL
85 // termination.
86 const char* data() const { return ptr_; }
87 int size() const { return length_; }
88 bool empty() const { return length_ == 0; }
89
90 void clear() { ptr_ = NULL; length_ = 0; }
91 void set(const char* buffer, int len) { ptr_ = buffer; length_ = len; }
92 void set(const char* str) {
93 ptr_ = str;
94 length_ = static_cast<int>(strlen(str));
95 }
96 void set(const void* buffer, int len) {
97 ptr_ = reinterpret_cast<const char*>(buffer);
98 length_ = len;
99 }
100
101 char operator[](int i) const { return ptr_[i]; }
102
103 void remove_prefix(int n) {
104 ptr_ += n;
105 length_ -= n;
106 }
107
108 void remove_suffix(int n) {
109 length_ -= n;
110 }
111
112 bool operator==(const StringPiece& x) const {
113 return ((length_ == x.length_) &&
114 (memcmp(ptr_, x.ptr_, length_) == 0));
115 }
116 bool operator!=(const StringPiece& x) const {
117 return !(*this == x);
118 }
119
120 #define STRINGPIECE_BINARY_PREDICATE(cmp,auxcmp) \
121 bool operator cmp (const StringPiece& x) const { \
122 int r = memcmp(ptr_, x.ptr_, length_ < x.length_ ? length_ : x.length_); \
123 return ((r auxcmp 0) || ((r == 0) && (length_ cmp x.length_))); \
124 }
125 STRINGPIECE_BINARY_PREDICATE(<, <);
126 STRINGPIECE_BINARY_PREDICATE(<=, <);
127 STRINGPIECE_BINARY_PREDICATE(>=, >);
128 STRINGPIECE_BINARY_PREDICATE(>, >);
129 #undef STRINGPIECE_BINARY_PREDICATE
130
131 int compare(const StringPiece& x) const {
132 int r = memcmp(ptr_, x.ptr_, length_ < x.length_ ? length_ : x.length_);
133 if (r == 0) {
134 if (length_ < x.length_) r = -1;
135 else if (length_ > x.length_) r = +1;
136 }
137 return r;
138 }
139
140 string as_string() const {
141 return string(data(), size());
142 }
143
144 void CopyToString(string* target) const {
145 target->assign(ptr_, length_);
146 }
147
148 // Does "this" start with "x"
149 bool starts_with(const StringPiece& x) const {
150 return ((length_ >= x.length_) && (memcmp(ptr_, x.ptr_, x.length_) == 0));
151 }
152 };
153
154 } // namespace pcrecpp
155
156 // ------------------------------------------------------------------
157 // Functions used to create STL containers that use StringPiece
158 // Remember that a StringPiece's lifetime had better be less than
159 // that of the underlying string or char*. If it is not, then you
160 // cannot safely store a StringPiece into an STL container
161 // ------------------------------------------------------------------
162
163 #ifdef HAVE_TYPE_TRAITS
164 // This makes vector<StringPiece> really fast for some STL implementations
165 template<> struct __type_traits<pcrecpp::StringPiece> {
166 typedef __true_type has_trivial_default_constructor;
167 typedef __true_type has_trivial_copy_constructor;
168 typedef __true_type has_trivial_assignment_operator;
169 typedef __true_type has_trivial_destructor;
170 typedef __true_type is_POD_type;
171 };
172 #endif
173
174 // allow StringPiece to be logged
175 std::ostream& operator<<(std::ostream& o, const pcrecpp::StringPiece& piece);
176
177 #endif /* _PCRE_STRINGPIECE_H */

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