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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

#ifndef _PCRECPPARG_H
#define _PCRECPPARG_H

#include <stdlib.h> // for NULL
#include <string>

#include <pcre.h>

namespace pcrecpp {

class StringPiece;

// Hex/Octal/Binary?

// Special class for parsing into objects that define a ParseFrom() method
template <class T>
class _RE_MatchObject {
 public:
  static inline bool Parse(const char* str, int n, void* dest) {
    T* object = reinterpret_cast<T*>(dest);
    return object->ParseFrom(str, n);
  }
};

class PCRECPP_EXP_DEFN Arg {
 public:
  // Empty constructor so we can declare arrays of Arg
  Arg();

  // Constructor specially designed for NULL arguments
  Arg(void*);

  typedef bool (*Parser)(const char* str, int n, void* dest);

// Type-specific parsers
#define PCRE_MAKE_PARSER(type,name) \
Arg(type* p) : arg_(p), parser_(name) { } \
Arg(type* p, Parser parser) : arg_(p), parser_(parser) { }


  PCRE_MAKE_PARSER(char, parse_char);
  PCRE_MAKE_PARSER(unsigned char, parse_uchar);
  PCRE_MAKE_PARSER(short, parse_short);
  PCRE_MAKE_PARSER(unsigned short, parse_ushort);
  PCRE_MAKE_PARSER(int, parse_int);
  PCRE_MAKE_PARSER(unsigned int, parse_uint);
  PCRE_MAKE_PARSER(long, parse_long);
  PCRE_MAKE_PARSER(unsigned long, parse_ulong);
#if 1
  PCRE_MAKE_PARSER(long long, parse_longlong);
#endif
#if 1
  PCRE_MAKE_PARSER(unsigned long long, parse_ulonglong);
#endif
  PCRE_MAKE_PARSER(float, parse_float);
  PCRE_MAKE_PARSER(double, parse_double);
  PCRE_MAKE_PARSER(std::string, parse_string);
  PCRE_MAKE_PARSER(StringPiece, parse_stringpiece);

#undef PCRE_MAKE_PARSER

  // Generic constructor
  template <class T> Arg(T*, Parser parser);
  // Generic constructor template
  template <class T> Arg(T* p)
    : arg_(p), parser_(_RE_MatchObject<T>::Parse) {
  }

  // Parse the data
  bool Parse(const char* str, int n) const;

 private:
  void* arg_;
  Parser parser_;

  static bool parse_null (const char* str, int n, void* dest);
  static bool parse_char (const char* str, int n, void* dest);
  static bool parse_uchar (const char* str, int n, void* dest);
  static bool parse_float (const char* str, int n, void* dest);
  static bool parse_double (const char* str, int n, void* dest);
  static bool parse_string (const char* str, int n, void* dest);
  static bool parse_stringpiece (const char* str, int n, void* dest);

#define PCRE_DECLARE_INTEGER_PARSER(name) \
private: \
static bool parse_ ## name(const char* str, int n, void* dest); \
static bool parse_ ## name ## _radix( \
const char* str, int n, void* dest, int radix); \
public: \
static bool parse_ ## name ## _hex(const char* str, int n, void* dest); \
static bool parse_ ## name ## _octal(const char* str, int n, void* dest); \
static bool parse_ ## name ## _cradix(const char* str, int n, void* dest)

  PCRE_DECLARE_INTEGER_PARSER(short);
  PCRE_DECLARE_INTEGER_PARSER(ushort);
  PCRE_DECLARE_INTEGER_PARSER(int);
  PCRE_DECLARE_INTEGER_PARSER(uint);
  PCRE_DECLARE_INTEGER_PARSER(long);
  PCRE_DECLARE_INTEGER_PARSER(ulong);
  PCRE_DECLARE_INTEGER_PARSER(longlong);
  PCRE_DECLARE_INTEGER_PARSER(ulonglong);

#undef PCRE_DECLARE_INTEGER_PARSER
};

inline Arg::Arg() : arg_(NULL), parser_(parse_null) { }
inline Arg::Arg(void* p) : arg_(p), parser_(parse_null) { }

inline bool Arg::Parse(const char* str, int n) const {
  return (*parser_)(str, n, arg_);
}

// This part of the parser, appropriate only for ints, deals with bases
#define MAKE_INTEGER_PARSER(type, name) \
inline Arg Hex(type* ptr) { \
return Arg(ptr, Arg::parse_ ## name ## _hex); } \
inline Arg Octal(type* ptr) { \
return Arg(ptr, Arg::parse_ ## name ## _octal); } \
inline Arg CRadix(type* ptr) { \
return Arg(ptr, Arg::parse_ ## name ## _cradix); }

MAKE_INTEGER_PARSER(short, short) /* */
MAKE_INTEGER_PARSER(unsigned short, ushort) /* */
MAKE_INTEGER_PARSER(int, int) /* Don't use semicolons */
MAKE_INTEGER_PARSER(unsigned int, uint) /* after these statement */
MAKE_INTEGER_PARSER(long, long) /* because they can cause */
MAKE_INTEGER_PARSER(unsigned long, ulong) /* compiler warnings if */
#if 1 /* the checking level is */
MAKE_INTEGER_PARSER(long long, longlong) /* turned up high enough. */
#endif /* */
#if 1 /* */
MAKE_INTEGER_PARSER(unsigned long long, ulonglong) /* */
#endif

#undef PCRE_IS_SET
#undef PCRE_SET_OR_CLEAR
#undef MAKE_INTEGER_PARSER

} // namespace pcrecpp


#endif /* _PCRECPPARG_H */
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