options.h

ACE自适配通信环境（ADAPTIVE Communication Environment）是可以自由使用、开放源码的面向对象（OO）框架（Framework）

// -*- C++ -*-

// Options.h,v 4.22 2004/04/24 04:20:21 ossama Exp

// Copyright (C) 1989 Free Software Foundation, Inc.
// written by Douglas C. Schmidt ([e-mail])

// This file is part of GNU GPERF.

// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation; either version 2
// of the License, or (at your option) any later version.

// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.

#ifndef OPTIONS_H
#define OPTIONS_H

#include "ace/Log_Msg.h"

#if !defined (ACE_LACKS_PRAGMA_ONCE)
# pragma once
#endif /* ACE_LACKS_PRAGMA_ONCE */

#if defined (ACE_HAS_GPERF)

// Enumerate the potential debugging Options.

enum Option_Type
{
  DEBUGGING    = 01,            // Enable debugging (prints diagnostics to stderr).
  ORDER        = 02,            // Apply ordering heuristic to speed-up search time.
  ANSI         = 04,            // Generate ANSI prototypes.
  ALLCHARS     = 010,           // Use all characters in hash function.
  INLINE       = 020,           // Generate code for inline functions.
  TYPE         = 040,           // Handle user-defined type structured keyword input.
  RANDOM       = 0100,          // Randomly initialize the associated values table.
  DEFAULTCHARS = 0200,          // Make default char positions be 1,$ (end of keyword).
  SWITCH       = 0400,          // Generate switch output to save space.
  POINTER      = 01000,         // Have in_word_set function return pointer, not boolean.
  NOLENGTH     = 02000,         // Don't include keyword length in hash computations.
  LENTABLE     = 04000,         // Generate a length table for string comparison.
  DUP          = 010000,        // Handle duplicate hash values for keywords.
  FAST         = 020000,        // Generate the hash function ``fast.''
  NOTYPE       = 040000,        // Don't include user-defined type definition in output -- it's already defined elsewhere.
  COMP         = 0100000,       // Generate strncmp rather than strcmp.
  GLOBAL       = 0200000,       // Make the keyword table a global variable.
  CONSTANT     = 0400000,       // Make the generated tables readonly (const).
  CPLUSPLUS    = 01000000,      // Generate C++ code.
  C            = 02000000,      // Generate C code.
  ENUM         = 04000000,      // Use enum for constants.
  STRCASECMP   = 010000000,     // Use the case insensitive comparison.
  OPTIMIZE     = 020000000,     // Assume all input keywords are in the keyset.
  ADA          = 040000000,     // Generate Ada code.
  MUTE         = 0100000000,    // Dont print the warnings.
  SKIPCLASS    = 0200000000,    // Skip the class definition part in the output while in C++ mode.
  SKIPSTRINGH  = 0400000000,    // Skip including the header file string.h.
  BINARYSEARCH = 01000000000,   // Generates Binary Search code.
  LINEARSEARCH = 02000000000    // Generates Linear Search code.
};

// Define some useful constants (these don't really belong here, but
// I'm not sure where else to put them!).  These should be consts, but
// g++ doesn't seem to do the right thing with them at the
// moment... ;-(

// PharLap ETS defines EOS as well... so if building for ETS, clear out
// their EOS.
#if defined (ACE_HAS_PHARLAP) && defined (EOS)
# undef EOS
#endif /* ACE_HAS_PHARLAP && EOS */

enum
{
  MAX_KEY_POS = 128 - 1,    // Max size of each word's key set.
  WORD_START = 1,           // Signals the start of a word.
  WORD_END = 0,             // Signals the end of a word.
  EOS = MAX_KEY_POS         // Signals end of the key list.
};

// @@ The Options class should be changed to use the Singleton pattern.
class Options
{
  // = TITLE
  //   This class provides a uniform interface to the various options
  //   available to a user of the gperf hash function generator.
  //
  // = DESCRIPTION
  //   In addition to the run-time options, found in the <Option_Type>
  //   there is also the hash table Size and the Keys to be used in
  //   the hashing.  The overall design of this module was an
  //   experiment in using C++ classes as a mechanism to enhance
  //   centralization of option and and error handling.
public:
  Options (void);
  ~Options (void);
  int operator[] (Option_Type option);
  int parse_args (int argc, char *argv[]);
  void operator= (enum Option_Type);
  bool operator!= (enum Option_Type);
  static void print_options (void);
  static void asso_max (int r);
  static int asso_max (void);
  static void reset (void);
  static int get (void);
  static int iterations (void);
  static u_int max_keysig_size (void);
  static void keysig_size (u_int);
  static int jump (void);
  static int initial_value (void);
  static int total_switches (void);
  static const char *function_name (void);
  static const char *fill_default (void);
  static const char *key_name (void);
  static const char *class_name (void);
  static const char *hash_name (void);
  static const char *delimiter (void);

private:
  static int option_word_;
  // Holds the user-specified Options.

  static int total_switches_;
  // Number of switch statements to generate.

  static u_int total_keysig_size_;
  // Total number of distinct key_positions.

  static int size_;
  // Range of the hash table.

  static int key_pos_;
  // Tracks current key position for Iterator.

  static int jump_;
  // Jump length when trying alternative values.

  static int initial_asso_value_;
  // Initial value for asso_values table.

  static int iterations_;
  // Amount to iterate when a collision occurs.

  static int argc_;
  // Records count of command-line arguments.

  static char **argv_;
  // Stores a pointer to command-line vector.

  static const char *function_name_;
  // Names used for generated lookup function.

  static const char  *fill_default_;
  // Expression used to assign default values in keyword table.

  static const char *key_name_;
  // Name used for keyword key.

  static const char *class_name_;
  // Name used for generated C++ class.

  static const char *hash_name_;
  // Name used for generated hash function.

  static const char *delimiters_;
  // Separates keywords from other attributes.

  static char key_positions_[MAX_KEY_POS];
  // Contains user-specified key choices.

  static int key_sort (char *base, int len);
  // Sorts key positions in REVERSE order.

  static void usage (void);
  // Prints proper program usage.
};

// Global option coordinator for the entire program.
extern Options option;

#endif /* ACE_HAS_GPERF */
#endif /* OPTIONS_H */