Annotation of embedaddon/pcre/pcre_stringpiece.h.in, revision 1.1.1.1
1.1 misho 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 <cstring>
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::memcmp;
56: using std::strlen;
57: using std::string;
58:
59: namespace pcrecpp {
60:
61: class PCRECPP_EXP_DEFN StringPiece {
62: private:
63: const char* ptr_;
64: int length_;
65:
66: public:
67: // We provide non-explicit singleton constructors so users can pass
68: // in a "const char*" or a "string" wherever a "StringPiece" is
69: // expected.
70: StringPiece()
71: : ptr_(NULL), length_(0) { }
72: StringPiece(const char* str)
73: : ptr_(str), length_(static_cast<int>(strlen(ptr_))) { }
74: StringPiece(const unsigned char* str)
75: : ptr_(reinterpret_cast<const char*>(str)),
76: length_(static_cast<int>(strlen(ptr_))) { }
77: StringPiece(const string& str)
78: : ptr_(str.data()), length_(static_cast<int>(str.size())) { }
79: StringPiece(const char* offset, int len)
80: : ptr_(offset), length_(len) { }
81:
82: // data() may return a pointer to a buffer with embedded NULs, and the
83: // returned buffer may or may not be null terminated. Therefore it is
84: // typically a mistake to pass data() to a routine that expects a NUL
85: // terminated string. Use "as_string().c_str()" if you really need to do
86: // this. Or better yet, change your routine so it does not rely on NUL
87: // termination.
88: const char* data() const { return ptr_; }
89: int size() const { return length_; }
90: bool empty() const { return length_ == 0; }
91:
92: void clear() { ptr_ = NULL; length_ = 0; }
93: void set(const char* buffer, int len) { ptr_ = buffer; length_ = len; }
94: void set(const char* str) {
95: ptr_ = str;
96: length_ = static_cast<int>(strlen(str));
97: }
98: void set(const void* buffer, int len) {
99: ptr_ = reinterpret_cast<const char*>(buffer);
100: length_ = len;
101: }
102:
103: char operator[](int i) const { return ptr_[i]; }
104:
105: void remove_prefix(int n) {
106: ptr_ += n;
107: length_ -= n;
108: }
109:
110: void remove_suffix(int n) {
111: length_ -= n;
112: }
113:
114: bool operator==(const StringPiece& x) const {
115: return ((length_ == x.length_) &&
116: (memcmp(ptr_, x.ptr_, length_) == 0));
117: }
118: bool operator!=(const StringPiece& x) const {
119: return !(*this == x);
120: }
121:
122: #define STRINGPIECE_BINARY_PREDICATE(cmp,auxcmp) \
123: bool operator cmp (const StringPiece& x) const { \
124: int r = memcmp(ptr_, x.ptr_, length_ < x.length_ ? length_ : x.length_); \
125: return ((r auxcmp 0) || ((r == 0) && (length_ cmp x.length_))); \
126: }
127: STRINGPIECE_BINARY_PREDICATE(<, <);
128: STRINGPIECE_BINARY_PREDICATE(<=, <);
129: STRINGPIECE_BINARY_PREDICATE(>=, >);
130: STRINGPIECE_BINARY_PREDICATE(>, >);
131: #undef STRINGPIECE_BINARY_PREDICATE
132:
133: int compare(const StringPiece& x) const {
134: int r = memcmp(ptr_, x.ptr_, length_ < x.length_ ? length_ : x.length_);
135: if (r == 0) {
136: if (length_ < x.length_) r = -1;
137: else if (length_ > x.length_) r = +1;
138: }
139: return r;
140: }
141:
142: string as_string() const {
143: return string(data(), size());
144: }
145:
146: void CopyToString(string* target) const {
147: target->assign(ptr_, length_);
148: }
149:
150: // Does "this" start with "x"
151: bool starts_with(const StringPiece& x) const {
152: return ((length_ >= x.length_) && (memcmp(ptr_, x.ptr_, x.length_) == 0));
153: }
154: };
155:
156: } // namespace pcrecpp
157:
158: // ------------------------------------------------------------------
159: // Functions used to create STL containers that use StringPiece
160: // Remember that a StringPiece's lifetime had better be less than
161: // that of the underlying string or char*. If it is not, then you
162: // cannot safely store a StringPiece into an STL container
163: // ------------------------------------------------------------------
164:
165: #ifdef HAVE_TYPE_TRAITS
166: // This makes vector<StringPiece> really fast for some STL implementations
167: template<> struct __type_traits<pcrecpp::StringPiece> {
168: typedef __true_type has_trivial_default_constructor;
169: typedef __true_type has_trivial_copy_constructor;
170: typedef __true_type has_trivial_assignment_operator;
171: typedef __true_type has_trivial_destructor;
172: typedef __true_type is_POD_type;
173: };
174: #endif
175:
176: // allow StringPiece to be logged
177: std::ostream& operator<<(std::ostream& o, const pcrecpp::StringPiece& piece);
178:
179: #endif /* _PCRE_STRINGPIECE_H */
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