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stringpiece.h
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1 // Copyright (C) 2009-2013, International Business Machines
2 // Corporation and others. All Rights Reserved.
3 //
4 // Copyright 2001 and onwards Google Inc.
5 // Author: Sanjay Ghemawat
6
7 // This code is a contribution of Google code, and the style used here is
8 // a compromise between the original Google code and the ICU coding guidelines.
9 // For example, data types are ICU-ified (size_t,int->int32_t),
10 // and API comments doxygen-ified, but function names and behavior are
11 // as in the original, if possible.
12 // Assertion-style error handling, not available in ICU, was changed to
13 // parameter "pinning" similar to UnicodeString.
14 //
15 // In addition, this is only a partial port of the original Google code,
16 // limited to what was needed so far. The (nearly) complete original code
17 // is in the ICU svn repository at icuhtml/trunk/design/strings/contrib
18 // (see ICU ticket 6765, r25517).
19
20 #ifndef __STRINGPIECE_H__
21 #define __STRINGPIECE_H__
22
28 #include "unicode/utypes.h"
29 #include "unicode/uobject.h"
30 #include "unicode/std_string.h"
31
32 // Arghh! I wish C++ literals were "string".
33
34 U_NAMESPACE_BEGIN
35
52 class U_COMMON_API StringPiece : public UMemory {
53 private:
54 const char* ptr_;
55 int32_t length_;
56
57 public:
62 StringPiece() : ptr_(NULL), length_(0) { }
68 StringPiece(const char* str);
69 #if U_HAVE_STD_STRING
70
74 StringPiece(const std::string& str)
75 : ptr_(str.data()), length_(static_cast<int32_t>(str.size())) { }
76 #endif
77
83 StringPiece(const char* offset, int32_t len) : ptr_(offset), length_(len) { }
90 StringPiece(const StringPiece& x, int32_t pos);
99 StringPiece(const StringPiece& x, int32_t pos, int32_t len);
100
111 const char* data() const { return ptr_; }
117 int32_t size() const { return length_; }
123 int32_t length() const { return length_; }
129 UBool empty() const { return length_ == 0; }
130
135 void clear() { ptr_ = NULL; length_ = 0; }
136
143 void set(const char* xdata, int32_t len) { ptr_ = xdata; length_ = len; }
144
150 void set(const char* str);
151
157 void remove_prefix(int32_t n) {
158 if (n >= 0) {
159 if (n > length_) {
160 n = length_;
161 }
162 ptr_ += n;
163 length_ -= n;
164 }
165 }
166
172 void remove_suffix(int32_t n) {
173 if (n >= 0) {
174 if (n <= length_) {
175 length_ -= n;
176 } else {
177 length_ = 0;
178 }
179 }
180 }
181
186 static const int32_t npos; // = 0x7fffffff;
187
196 StringPiece substr(int32_t pos, int32_t len = npos) const {
197 return StringPiece(*this, pos, len);
198 }
199 };
200
208 U_EXPORT UBool U_EXPORT2
209 operator==(const StringPiece& x, const StringPiece& y);
210
218 inline UBool operator!=(const StringPiece& x, const StringPiece& y) {
219 return !(x == y);
220 }
221
222 U_NAMESPACE_END
223
224 #endif // __STRINGPIECE_H__