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Member "pcre-8.42/pcre_stringpiece.h.in" (21 Apr 2017, 6361 Bytes) of package /linux/misc/pcre-8.42.tar.bz2:


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    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 namespace pcrecpp {
   56 
   57 using std::memcmp;
   58 using std::strlen;
   59 using std::string;
   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 PCRECPP_EXP_DECL std::ostream& operator<<(std::ostream& o,
  178                                           const pcrecpp::StringPiece& piece);
  179 
  180 #endif /* _PCRE_STRINGPIECE_H */