Annotation of embedaddon/pcre/pcre_stringpiece.h.in, revision 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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