summaryrefslogtreecommitdiffstats
path: root/arg_parser.cc
blob: b843c09e0e730bae99f10724f927048f72621063 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
/* Arg_parser - POSIX/GNU command line argument parser. (C++ version)
   Copyright (C) 2006-2020 Antonio Diaz Diaz.

   This library is free software. Redistribution and use in source and
   binary forms, with or without modification, are permitted provided
   that the following conditions are met:

   1. Redistributions of source code must retain the above copyright
   notice, this list of conditions, and the following disclaimer.

   2. 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.

   This library 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.
*/

#include <cstring>
#include <string>
#include <vector>

#include "arg_parser.h"


bool Arg_parser::parse_long_option( const char * const opt, const char * const arg,
                                    const Option options[], int & argind )
  {
  unsigned len;
  int index = -1;
  bool exact = false, ambig = false;

  for( len = 0; opt[len+2] && opt[len+2] != '='; ++len ) ;

  // Test all long options for either exact match or abbreviated matches.
  for( int i = 0; options[i].code != 0; ++i )
    if( options[i].name && std::strncmp( options[i].name, &opt[2], len ) == 0 )
      {
      if( std::strlen( options[i].name ) == len )	// Exact match found
        { index = i; exact = true; break; }
      else if( index < 0 ) index = i;		// First nonexact match found
      else if( options[index].code != options[i].code ||
               options[index].has_arg != options[i].has_arg )
        ambig = true;		// Second or later nonexact match found
      }

  if( ambig && !exact )
    {
    error_ = "option '"; error_ += opt; error_ += "' is ambiguous";
    return false;
    }

  if( index < 0 )		// nothing found
    {
    error_ = "unrecognized option '"; error_ += opt; error_ += '\'';
    return false;
    }

  ++argind;
  data.push_back( Record( options[index].code ) );

  if( opt[len+2] )		// '--<long_option>=<argument>' syntax
    {
    if( options[index].has_arg == no )
      {
      error_ = "option '--"; error_ += options[index].name;
      error_ += "' doesn't allow an argument";
      return false;
      }
    if( options[index].has_arg == yes && !opt[len+3] )
      {
      error_ = "option '--"; error_ += options[index].name;
      error_ += "' requires an argument";
      return false;
      }
    data.back().argument = &opt[len+3];
    return true;
    }

  if( options[index].has_arg == yes )
    {
    if( !arg || !arg[0] )
      {
      error_ = "option '--"; error_ += options[index].name;
      error_ += "' requires an argument";
      return false;
      }
    ++argind; data.back().argument = arg;
    return true;
    }

  return true;
  }


bool Arg_parser::parse_short_option( const char * const opt, const char * const arg,
                                     const Option options[], int & argind )
  {
  int cind = 1;			// character index in opt

  while( cind > 0 )
    {
    int index = -1;
    const unsigned char c = opt[cind];

    if( c != 0 )
      for( int i = 0; options[i].code; ++i )
        if( c == options[i].code )
          { index = i; break; }

    if( index < 0 )
      {
      error_ = "invalid option -- '"; error_ += c; error_ += '\'';
      return false;
      }

    data.push_back( Record( c ) );
    if( opt[++cind] == 0 ) { ++argind; cind = 0; }	// opt finished

    if( options[index].has_arg != no && cind > 0 && opt[cind] )
      {
      data.back().argument = &opt[cind]; ++argind; cind = 0;
      }
    else if( options[index].has_arg == yes )
      {
      if( !arg || !arg[0] )
        {
        error_ = "option requires an argument -- '"; error_ += c;
        error_ += '\'';
        return false;
        }
      data.back().argument = arg; ++argind; cind = 0;
      }
    }
  return true;
  }


Arg_parser::Arg_parser( const int argc, const char * const argv[],
                        const Option options[], const bool in_order )
  {
  if( argc < 2 || !argv || !options ) return;

  std::vector< const char * > non_options;	// skipped non-options
  int argind = 1;				// index in argv

  while( argind < argc )
    {
    const unsigned char ch1 = argv[argind][0];
    const unsigned char ch2 = ch1 ? argv[argind][1] : 0;

    if( ch1 == '-' && ch2 )		// we found an option
      {
      const char * const opt = argv[argind];
      const char * const arg = ( argind + 1 < argc ) ? argv[argind+1] : 0;
      if( ch2 == '-' )
        {
        if( !argv[argind][2] ) { ++argind; break; }	// we found "--"
        else if( !parse_long_option( opt, arg, options, argind ) ) break;
        }
      else if( !parse_short_option( opt, arg, options, argind ) ) break;
      }
    else
      {
      if( in_order ) data.push_back( Record( argv[argind++] ) );
      else non_options.push_back( argv[argind++] );
      }
    }
  if( !error_.empty() ) data.clear();
  else
    {
    for( unsigned i = 0; i < non_options.size(); ++i )
      data.push_back( Record( non_options[i] ) );
    while( argind < argc )
      data.push_back( Record( argv[argind++] ) );
    }
  }


Arg_parser::Arg_parser( const char * const opt, const char * const arg,
                        const Option options[] )
  {
  if( !opt || !opt[0] || !options ) return;

  if( opt[0] == '-' && opt[1] )		// we found an option
    {
    int argind = 1;			// dummy
    if( opt[1] == '-' )
      { if( opt[2] ) parse_long_option( opt, arg, options, argind ); }
    else
      parse_short_option( opt, arg, options, argind );
    if( !error_.empty() ) data.clear();
    }
  else data.push_back( Record( opt ) );
  }