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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 #ifndef _PCRECPPARG_H
   33 #define _PCRECPPARG_H
   34 
   35 #include <stdlib.h>    // for NULL
   36 #include <string>
   37 
   38 #include <pcre.h>
   39 
   40 namespace pcrecpp {
   41 
   42 class StringPiece;
   43 
   44 // Hex/Octal/Binary?
   45 
   46 // Special class for parsing into objects that define a ParseFrom() method
   47 template <class T>
   48 class _RE_MatchObject {
   49  public:
   50   static inline bool Parse(const char* str, int n, void* dest) {
   51     if (dest == NULL) return true;
   52     T* object = reinterpret_cast<T*>(dest);
   53     return object->ParseFrom(str, n);
   54   }
   55 };
   56 
   57 class PCRECPP_EXP_DEFN Arg {
   58  public:
   59   // Empty constructor so we can declare arrays of Arg
   60   Arg();
   61 
   62   // Constructor specially designed for NULL arguments
   63   Arg(void*);
   64 
   65   typedef bool (*Parser)(const char* str, int n, void* dest);
   66 
   67 // Type-specific parsers
   68 #define PCRE_MAKE_PARSER(type,name)                             \
   69   Arg(type* p) : arg_(p), parser_(name) { }                     \
   70   Arg(type* p, Parser parser) : arg_(p), parser_(parser) { }
   71 
   72 
   73   PCRE_MAKE_PARSER(char,               parse_char);
   74   PCRE_MAKE_PARSER(unsigned char,      parse_uchar);
   75   PCRE_MAKE_PARSER(short,              parse_short);
   76   PCRE_MAKE_PARSER(unsigned short,     parse_ushort);
   77   PCRE_MAKE_PARSER(int,                parse_int);
   78   PCRE_MAKE_PARSER(unsigned int,       parse_uint);
   79   PCRE_MAKE_PARSER(long,               parse_long);
   80   PCRE_MAKE_PARSER(unsigned long,      parse_ulong);
   81 #if @pcre_have_long_long@
   82   PCRE_MAKE_PARSER(long long,          parse_longlong);
   83 #endif
   84 #if @pcre_have_ulong_long@
   85   PCRE_MAKE_PARSER(unsigned long long, parse_ulonglong);
   86 #endif
   87   PCRE_MAKE_PARSER(float,              parse_float);
   88   PCRE_MAKE_PARSER(double,             parse_double);
   89   PCRE_MAKE_PARSER(std::string,        parse_string);
   90   PCRE_MAKE_PARSER(StringPiece,        parse_stringpiece);
   91 
   92 #undef PCRE_MAKE_PARSER
   93 
   94   // Generic constructor
   95   template <class T> Arg(T*, Parser parser);
   96   // Generic constructor template
   97   template <class T> Arg(T* p)
   98     : arg_(p), parser_(_RE_MatchObject<T>::Parse) {
   99   }
  100 
  101   // Parse the data
  102   bool Parse(const char* str, int n) const;
  103 
  104  private:
  105   void*         arg_;
  106   Parser        parser_;
  107 
  108   static bool parse_null          (const char* str, int n, void* dest);
  109   static bool parse_char          (const char* str, int n, void* dest);
  110   static bool parse_uchar         (const char* str, int n, void* dest);
  111   static bool parse_float         (const char* str, int n, void* dest);
  112   static bool parse_double        (const char* str, int n, void* dest);
  113   static bool parse_string        (const char* str, int n, void* dest);
  114   static bool parse_stringpiece   (const char* str, int n, void* dest);
  115 
  116 #define PCRE_DECLARE_INTEGER_PARSER(name)                                   \
  117  private:                                                                   \
  118   static bool parse_ ## name(const char* str, int n, void* dest);           \
  119   static bool parse_ ## name ## _radix(                                     \
  120     const char* str, int n, void* dest, int radix);                         \
  121  public:                                                                    \
  122   static bool parse_ ## name ## _hex(const char* str, int n, void* dest);   \
  123   static bool parse_ ## name ## _octal(const char* str, int n, void* dest); \
  124   static bool parse_ ## name ## _cradix(const char* str, int n, void* dest)
  125 
  126   PCRE_DECLARE_INTEGER_PARSER(short);
  127   PCRE_DECLARE_INTEGER_PARSER(ushort);
  128   PCRE_DECLARE_INTEGER_PARSER(int);
  129   PCRE_DECLARE_INTEGER_PARSER(uint);
  130   PCRE_DECLARE_INTEGER_PARSER(long);
  131   PCRE_DECLARE_INTEGER_PARSER(ulong);
  132   PCRE_DECLARE_INTEGER_PARSER(longlong);
  133   PCRE_DECLARE_INTEGER_PARSER(ulonglong);
  134 
  135 #undef PCRE_DECLARE_INTEGER_PARSER
  136 };
  137 
  138 inline Arg::Arg() : arg_(NULL), parser_(parse_null) { }
  139 inline Arg::Arg(void* p) : arg_(p), parser_(parse_null) { }
  140 
  141 inline bool Arg::Parse(const char* str, int n) const {
  142   return (*parser_)(str, n, arg_);
  143 }
  144 
  145 // This part of the parser, appropriate only for ints, deals with bases
  146 #define MAKE_INTEGER_PARSER(type, name) \
  147   inline Arg Hex(type* ptr) { \
  148     return Arg(ptr, Arg::parse_ ## name ## _hex); } \
  149   inline Arg Octal(type* ptr) { \
  150     return Arg(ptr, Arg::parse_ ## name ## _octal); } \
  151   inline Arg CRadix(type* ptr) { \
  152     return Arg(ptr, Arg::parse_ ## name ## _cradix); }
  153 
  154 MAKE_INTEGER_PARSER(short,              short)     /*                        */
  155 MAKE_INTEGER_PARSER(unsigned short,     ushort)    /*                        */
  156 MAKE_INTEGER_PARSER(int,                int)       /* Don't use semicolons   */
  157 MAKE_INTEGER_PARSER(unsigned int,       uint)      /* after these statement  */
  158 MAKE_INTEGER_PARSER(long,               long)      /* because they can cause */
  159 MAKE_INTEGER_PARSER(unsigned long,      ulong)     /* compiler warnings if   */
  160 #if @pcre_have_long_long@                          /* the checking level is  */
  161 MAKE_INTEGER_PARSER(long long,          longlong)  /* turned up high enough. */
  162 #endif                                             /*                        */
  163 #if @pcre_have_ulong_long@                         /*                        */
  164 MAKE_INTEGER_PARSER(unsigned long long, ulonglong) /*                        */
  165 #endif
  166 
  167 #undef PCRE_IS_SET
  168 #undef PCRE_SET_OR_CLEAR
  169 #undef MAKE_INTEGER_PARSER
  170 
  171 }   // namespace pcrecpp
  172 
  173 
  174 #endif /* _PCRECPPARG_H */