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 // Copyright (c) 2005, Google Inc.
 // All rights reserved.
 //
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 // notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 // copyright notice, this list of conditions and the following disclaimer
 // in the documentation and/or other materials provided with the
 // distribution.
 //     * Neither the name of Google Inc. nor the names of its
 // contributors may be used to endorse or promote products derived from
 // this software without specific prior written permission.
 //
 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 //
 // Author: Sanjay Ghemawat
 //
 // A string like object that points into another piece of memory.
 // Useful for providing an interface that allows clients to easily
 // pass in either a "const char*" or a "string".
 //
 // Arghh!  I wish C++ literals were automatically of type "string".
 
 #ifndef _PCRE_STRINGPIECE_H
 #define _PCRE_STRINGPIECE_H
 
 #include <cstring>
 #include <string>
 #include <iosfwd>    // for ostream forward-declaration
 
 #if 0
 #define HAVE_TYPE_TRAITS
 #include <type_traits.h>
 #elif 0
 #define HAVE_TYPE_TRAITS
 #include <bits/type_traits.h>
 #endif
 
 #include <pcre.h>
 
 namespace pcrecpp {
 
 using std::memcmp;
 using std::strlen;
 using std::string;
 
 class PCRECPP_EXP_DEFN StringPiece {
  private:
   const char*   ptr_;
   int           length_;
 
  public:
   // We provide non-explicit singleton constructors so users can pass
   // in a "const char*" or a "string" wherever a "StringPiece" is
   // expected.
   StringPiece()
     : ptr_(NULL), length_(0) { }
   StringPiece(const char* str)
     : ptr_(str), length_(static_cast<int>(strlen(ptr_))) { }
   StringPiece(const unsigned char* str)
     : ptr_(reinterpret_cast<const char*>(str)),
       length_(static_cast<int>(strlen(ptr_))) { }
   StringPiece(const string& str)
     : ptr_(str.data()), length_(static_cast<int>(str.size())) { }
   StringPiece(const char* offset, int len)
     : ptr_(offset), length_(len) { }
 
   // data() may return a pointer to a buffer with embedded NULs, and the
   // returned buffer may or may not be null terminated.  Therefore it is
   // typically a mistake to pass data() to a routine that expects a NUL
   // terminated string.  Use "as_string().c_str()" if you really need to do
   // this.  Or better yet, change your routine so it does not rely on NUL
   // termination.
   const char* data() const { return ptr_; }
   int size() const { return length_; }
   bool empty() const { return length_ == 0; }
 
   void clear() { ptr_ = NULL; length_ = 0; }
   void set(const char* buffer, int len) { ptr_ = buffer; length_ = len; }
   void set(const char* str) {
     ptr_ = str;
     length_ = static_cast<int>(strlen(str));
   }
   void set(const void* buffer, int len) {
     ptr_ = reinterpret_cast<const char*>(buffer);
     length_ = len;
   }
 
   char operator[](int i) const { return ptr_[i]; }
 
   void remove_prefix(int n) {
     ptr_ += n;
     length_ -= n;
   }
 
   void remove_suffix(int n) {
     length_ -= n;
   }
 
   bool operator==(const StringPiece& x) const {
     return ((length_ == x.length_) &&
             (memcmp(ptr_, x.ptr_, length_) == 0));
   }
   bool operator!=(const StringPiece& x) const {
     return !(*this == x);
   }
 
 #define STRINGPIECE_BINARY_PREDICATE(cmp,auxcmp)                             \
   bool operator cmp (const StringPiece& x) const {                           \
     int r = memcmp(ptr_, x.ptr_, length_ < x.length_ ? length_ : x.length_); \
     return ((r auxcmp 0) || ((r == 0) && (length_ cmp x.length_)));          \
   }
   STRINGPIECE_BINARY_PREDICATE(<,  <);
   STRINGPIECE_BINARY_PREDICATE(<=, <);
   STRINGPIECE_BINARY_PREDICATE(>=, >);
   STRINGPIECE_BINARY_PREDICATE(>,  >);
 #undef STRINGPIECE_BINARY_PREDICATE
 
   int compare(const StringPiece& x) const {
     int r = memcmp(ptr_, x.ptr_, length_ < x.length_ ? length_ : x.length_);
     if (r == 0) {
       if (length_ < x.length_) r = -1;
       else if (length_ > x.length_) r = +1;
     }
     return r;
   }
 
   string as_string() const {
     return string(data(), size());
   }
 
   void CopyToString(string* target) const {
     target->assign(ptr_, length_);
   }
 
   // Does "this" start with "x"
   bool starts_with(const StringPiece& x) const {
     return ((length_ >= x.length_) && (memcmp(ptr_, x.ptr_, x.length_) == 0));
   }
 };
 
 }   // namespace pcrecpp
 
 // ------------------------------------------------------------------
 // Functions used to create STL containers that use StringPiece
 //  Remember that a StringPiece's lifetime had better be less than
 //  that of the underlying string or char*.  If it is not, then you
 //  cannot safely store a StringPiece into an STL container
 // ------------------------------------------------------------------
 
 #ifdef HAVE_TYPE_TRAITS
 // This makes vector<StringPiece> really fast for some STL implementations
 template<> struct __type_traits<pcrecpp::StringPiece> {
   typedef __true_type    has_trivial_default_constructor;
   typedef __true_type    has_trivial_copy_constructor;
   typedef __true_type    has_trivial_assignment_operator;
   typedef __true_type    has_trivial_destructor;
   typedef __true_type    is_POD_type;
 };
 #endif
 
 // allow StringPiece to be logged
 PCRECPP_EXP_DECL std::ostream& operator<<(std::ostream& o,
                                           const pcrecpp::StringPiece& piece);
 
 #endif /* _PCRE_STRINGPIECE_H */

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