/[pcre]/code/trunk/pcre_stringpiece.h.in
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Contents of /code/trunk/pcre_stringpiece.h.in

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Revision 256 - (hide annotations) (download)
Wed Sep 19 08:57:53 2007 UTC (6 years, 11 months ago) by ph10
File size: 6265 byte(s)
Patches to C++ code to avoid compiler warnings.

1 nigel 77 // 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 nigel 83 #if @pcre_have_type_traits@
46 nigel 77 #define HAVE_TYPE_TRAITS
47     #include <type_traits.h>
48 nigel 83 #elif @pcre_have_bits_type_traits@
49 nigel 77 #define HAVE_TYPE_TRAITS
50     #include <bits/type_traits.h>
51     #endif
52    
53 ph10 199 #include <pcre.h>
54    
55 nigel 77 using std::string;
56    
57     namespace pcrecpp {
58    
59 ph10 199 class PCRECPP_EXP_DEFN StringPiece {
60 nigel 77 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 ph10 256 : 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 nigel 77 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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