summaryrefslogtreecommitdiff
path: root/3rdparty/libconfig/extra/gen/scanner.l
blob: bdc57a8d4e85cb5d8643c8c1318df8d4c8012d8b (plain) (blame)
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
/* -*- mode: C -*- */
/* --------------------------------------------------------------------------
   libconfig - A library for processing structured configuration files
   Copyright (C) 2005-2010  Mark A Lindner

   This file is part of libconfig.

   This library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public License
   as published by the Free Software Foundation; either version 2.1 of
   the License, or (at your option) any later version.

   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.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Library General Public
   License along with this library; if not, see
   <http://www.gnu.org/licenses/>.
   ----------------------------------------------------------------------------
*/

%option nounistd
%option reentrant
%option noyywrap
%option yylineno
%option nounput
%option bison-bridge
%option never-interactive
%option header-file="scanner.h"
%option outfile="lex.yy.c"
%option extra-type="struct scan_context *"

%top{
#include "scanctx.h"
}

%{
#ifdef _MSC_VER
#pragma warning (disable: 4996)
/* disable MSVC warning "signed/unsigned mismatch" associated with code generated by flex versions such as 2.5.35. */
#pragma warning (disable:4018)
#endif

#include <stdlib.h>
#include <ctype.h>
#include <string.h>
#include "grammar.h"
#include "wincompat.h"
#include "parsectx.h"

#define YY_NO_INPUT // Suppress generation of useless input() function

static unsigned long long fromhex(const char *s)
{
#ifdef __MINGW32__

  /* MinGW's strtoull() seems to be broken; it only returns the lower
   * 32 bits...
   */

  const char *p = s;
  unsigned long long val = 0;

  if(*p != '0')
    return(0);

  ++p;

  if(*p != 'x' && *p != 'X')
    return(0);

  for(++p; isxdigit(*p); ++p)
  {
    val <<= 4;
    val |= ((*p < 'A') ? (*p & 0xF) : (9 + (*p & 0x7)));
  }

  return(val);

#else /* ! __MINGW32__ */

  return(strtoull(s, NULL, 16));

#endif /* __MINGW32__ */
}

%}

true              [Tt][Rr][Uu][Ee]
false             [Ff][Aa][Ll][Ss][Ee]
name              [A-Za-z\*][-A-Za-z0-9_\*']*
integer           [-+]?[0-9]+
integer64         [-+]?[0-9]+L(L)?
hex               0[Xx][0-9A-Fa-f]+
hex64             0[Xx][0-9A-Fa-f]+L(L)?
hexchar           \\[Xx][0-9A-Fa-f]{2}
float             ([-+]?([0-9]*)?\.[0-9]*([eE][-+]?[0-9]+)?)|([-+]?([0-9]+)(\.[0-9]*)?[eE][-+]?[0-9]+)
comment           (#|\/\/).*$
include_open      ^[ \t]*@include[ \t]+\"

%x COMMENT STRING INCLUDE

%%

\/\*              { BEGIN COMMENT; }
<COMMENT>\*\/     { BEGIN INITIAL; }
<COMMENT>.        { /* ignore */ }
<COMMENT>\n       { /* ignore */ }

\"                { BEGIN STRING; }
<STRING>[^\"\\]+  { scanctx_append_string(yyextra, yytext); }
<STRING>\\n       { scanctx_append_string(yyextra, "\n"); }
<STRING>\\r       { scanctx_append_string(yyextra, "\r"); }
<STRING>\\t       { scanctx_append_string(yyextra, "\t"); }
<STRING>\\f       { scanctx_append_string(yyextra, "\f"); }
<STRING>\\\\      { scanctx_append_string(yyextra, "\\"); }
<STRING>\\\"      { scanctx_append_string(yyextra, "\""); }
<STRING>{hexchar} {
                    char c[2] = { (char)(strtol(yytext + 2, NULL, 16) & 0xFF),
                                  0 };
                    scanctx_append_string(yyextra, c);
                  }
<STRING>\\        { scanctx_append_string(yyextra, "\\"); }
<STRING>\"        {
                    yylval->sval = scanctx_take_string(yyextra);
                    BEGIN INITIAL;
                    return(TOK_STRING);
                  }

{include_open}    { BEGIN INCLUDE; }
<INCLUDE>[^\"\\]+ { scanctx_append_string(yyextra, yytext); }
<INCLUDE>\\\\     { scanctx_append_string(yyextra, "\\"); }
<INCLUDE>\\\"     { scanctx_append_string(yyextra, "\""); }
<INCLUDE>\"       {
                    const char *error;
                    FILE *fp = scanctx_push_include(yyextra,
                                                    (void *)YY_CURRENT_BUFFER,
                                                    &error);
                    if(fp)
                    {
                      yyin = fp;
                      yy_switch_to_buffer(
                        yy_create_buffer(yyin, YY_BUF_SIZE, yyscanner),
                        yyscanner);
                    }
                    else
                    {
                      yyextra->config->error_text = error;
                      yyextra->config->error_file = scanctx_current_filename(
                        yyextra);
                      yyextra->config->error_line = libconfig_yyget_lineno(
                        yyscanner);
                      return TOK_ERROR;
                    }
                    BEGIN INITIAL;
                  }

\n|\r|\f          { /* ignore */ }
[ \t]+            { /* ignore */ }

\=|\:             { return(TOK_EQUALS); }
,                 { return(TOK_COMMA); }
\{                { return(TOK_GROUP_START); }
\}                { return(TOK_GROUP_END); }
{true}            { yylval->ival = 1; return(TOK_BOOLEAN); }
{false}           { yylval->ival = 0; return(TOK_BOOLEAN); }
{name}            { yylval->sval = yytext; return(TOK_NAME); }
{float}           { yylval->fval = atof(yytext); return(TOK_FLOAT); }
{integer}         { yylval->ival = atoi(yytext); return(TOK_INTEGER); }
{integer64}       { yylval->llval = atoll(yytext); return(TOK_INTEGER64); }
{hex}             {
                    yylval->ival = strtoul(yytext, NULL, 16);
                    return(TOK_HEX);
                  }
{hex64}           { yylval->llval = fromhex(yytext); return(TOK_HEX64); }
\[                { return(TOK_ARRAY_START); }
\]                { return(TOK_ARRAY_END); }
\(                { return(TOK_LIST_START); }
\)                { return(TOK_LIST_END); }
;                 { return(TOK_SEMICOLON); }
{comment}         { /* ignore */ }
.                 { return(TOK_GARBAGE); }

<<EOF>>           {
                    YY_BUFFER_STATE buf = (YY_BUFFER_STATE)scanctx_pop_include(
                      yyextra);
                    if(buf)
                    {
                      yy_delete_buffer(YY_CURRENT_BUFFER, yyscanner);
                      yy_switch_to_buffer(buf, yyscanner);
                    }
                    else
                      yyterminate();
                  }