File: lang.l

package info (click to toggle)
gp2c 0.0.12-2
  • links: PTS
  • area: main
  • in suites: bullseye
  • size: 2,916 kB
  • sloc: ansic: 8,592; sh: 1,606; lex: 346; yacc: 226; makefile: 107
file content (346 lines) | stat: -rw-r--r-- 9,451 bytes parent folder | download | duplicates (2)
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
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
%{
/*
Copyright (C) 2000-2013  The PARI group.

This file is part of the GP2C package.

PARI/GP 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. It is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY WHATSOEVER.

Check the License for details. You should have received a copy of it, along
with the package; see the file 'COPYING'. If not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.*/

#include "config.h"
#include <unistd.h>
#include <string.h>
#include "header.h"
#include "parse.h"

#define MAX_INCLUDE_DEPTH 10
extern int yydebug;
static YY_BUFFER_STATE include_stack[MAX_INCLUDE_DEPTH];
static int depth = 0;
static int linecount_stack[MAX_INCLUDE_DEPTH];
static int filecount_stack[MAX_INCLUDE_DEPTH];

static enum {Mread_lines,Min_braces} mode=Mread_lines;
static int start=0;
static int lastcom=-1;
static void countline(char *text,int len)
{
  int i;
  for (i=0; i<len; i++)
    linecount+=(text[i]=='\n');
}
/* yytext is not global on OSF1 flex */
static void copytoken(char *yytext)
{
  yylval.str.s=strdup(yytext);
  if (yydebug) fprintf(stderr,"[%s]",yytext);
  yylval.str.c=lastcom; lastcom=-1;
}
static void copyentry(char *yytext)
{
  if (strchr(yytext,' '))
    die(err_parse,"Space inside identifier name `%s'",yytext);
  copytoken(yytext);
}
/* similarly for yyleng */
static void copystring(char *yytext, int yyleng)
{
  yylval.str.s=strdup(yytext+1);
  yylval.str.s[yyleng-2]=0;
  if (yydebug) fprintf(stderr,"[%s]",yytext);
  countline(yytext,yyleng);
  yylval.str.c=lastcom; lastcom=-1;
}
static int yywrap(void ) {return 1;}

/* There are two start conditions:
   -- toplevel
   -- INITIAL

We start at toplevel. As soon as we see a non toplevel command, we go to
INITIAL. When the command is completed, we revert to toplevel. It is better to
stay at toplevel when we encounter non-command tokens (comments, white spaces).

The mode can be
Mread_lines: line by line mode
Min_braces : inside braces
*/
/* REAL_NOEXPO can be confused with member function to integer
 * so we let parse.y handle them
 */
%}
HEXINTEGER 0x[0-9A-Za-z]([0-9A-Za-z ]*[0-9A-Za-z])?
BININTEGER 0b[01]([01 ]*[01])?
INTEGER [0-9]([0-9 ]*[0-9])?
EXPO [eE][+-]?{INTEGER}
REAL_NODOT {INTEGER}{EXPO}
REAL_TAIL  {INTEGER}?"."{INTEGER}{EXPO}?
REAL_EXPO  {INTEGER}?"."{EXPO}
REAL_NOEXPO {INTEGER}"."
REAL {REAL_NODOT}|{REAL_TAIL}|{REAL_EXPO}
STRING \"([^"\\]|(\\.))*\"
ENTRY [A-Za-z]([A-Za-z0-9_ ]*[A-Za-z0-9_])?
%x toplevel
%%
        if (!start) {start=1; BEGIN(toplevel);}
{ENTRY}         copyentry(yytext); return KENTRY;
{INTEGER}       copytoken(yytext); return KINTEGER;
{HEXINTEGER}    copytoken(yytext); return KINTEGER;
{BININTEGER}    copytoken(yytext); return KINTEGER;
{REAL}          copytoken(yytext); return KREAL;
{REAL_NOEXPO}/[^_A-Za-z.]  copytoken(yytext); return KREAL;
{STRING}        copystring(yytext,yyleng); return KSTRING;

<<EOF>>  {
  if ( --depth < 0 )
    yyterminate();
  else
  {
    yy_delete_buffer( YY_CURRENT_BUFFER );
    yy_switch_to_buffer(include_stack[depth]);
    linecount = linecount_stack[depth];
    filecount = filecount_stack[depth];
  }
}

<toplevel>\\r[^\n]+ { /*With credit to flex manpage*/
  char *s=yytext+2;
  size_t ls;
  while(*s==' ' || *s=='\t') s++;
  if ( depth >= MAX_INCLUDE_DEPTH )
    die(-1,"\\r includes nested too deeply" );
  linecount_stack[depth] = linecount;
  filecount_stack[depth] = filecount;
  include_stack[depth++] = YY_CURRENT_BUFFER;
  ls = strlen(s);
  if (s[0]=='"' && s[ls-1]=='"')
  {
    s[ls-1]=0;
    s++;
  }
  yyin = fopen(s,"r");
  if (!yyin)
  {
    char *t=(char*)malloc(strlen(s)+4);
    sprintf(t,"%s.gp",s);
    yyin = fopen(t,"r");
    if (!yyin)
      die(-1,"cannot open file `%s'",s);
    s=t;
  }
  else
    s = strdup(s);
  linecount=1;
  filecount=newsrcfile(s);
  yy_switch_to_buffer( yy_create_buffer( yyin, YY_BUF_SIZE ) );
}


<toplevel>\\[a-qs-z][^\n]*|\?[^\n]* {
        fprintf(stderr,"Warning:%s:%d: meta commands not implemented\n%s\n",
                        srcfile[filecount],linecount,yytext);
                        }

<toplevel>##?[ \t\r]*$ { /*We cannot recognize #<EOF> */
        fprintf(stderr,"Warning:%s:%d: meta commands not implemented\n%s\n",
                        srcfile[filecount],linecount,yytext);
                        }

".."            return KDOTDOT;
"->"            return KARROW;
\)[ \t\r]*->    return KPARROW;
"\\/"           return KDR;
">>"            return KSR;
"<<"            return KSL;
"<="            return KLE;
">="            return KGE;
"!="|"<>"       return KNE;
"==="           return KID;
"=="            return KEQ;
"&&"            return KAND;
"||"            return KOR;

"++"            return KPP;
"--"            return KSS;
"+="            return KPE;
"-="            return KSE;
"*="            return KME;
"/="            return KDE;
"\\="           return KEUCE;
"\\/="          return KDRE;
"%="            return KMODE;
">>="           return KSRE;
"<<="           return KSLE;

"\n"            {linecount++;if (mode==Mread_lines) {BEGIN(toplevel);return '\n';}}
<toplevel>"\n"  {linecount++;return '\n';}
"{"             {mode=Min_braces;BEGIN(INITIAL);}
"}"             {mode=Mread_lines;BEGIN(toplevel);}

<INITIAL,toplevel>"\\\n"   {linecount++;}

"=" { for( ; ; )
      {
        int c, nc, star=0;
        for( ; ; )
        {
          c = input();
          if ( c == EOF || c == 0 )
            return c;
          if ( c == '\n' )
            linecount++;
          else if ( c!=' ' && c!='\t' && c!='\r')
            break;
        }
        /*Since only one char of look-ahead is available, we have to
          handle the / or \ by ourself. Fortunately:
          after =/, only * is valid,
          after =\, only \ and \\n are valid.
          Thus we handle them and reject the rest.
         */
        if (c!='/' && c!='\\')
        {
          unput(c);
          return '=';
        }
        nc=input();
        if (c=='\\' && nc=='\n')
        {
          linecount++;
          continue;
        }
        if ((c=='/' && nc!='*') || (c=='\\' && nc!='\\'))
        {
          fprintf(stderr,"%s:%d: parse error after =%c%c\n"
           ,srcfile[filecount],linecount,(char)c,(char)nc);
          fprintf(stderr,"Errors found: aborting...\n");
          exit(1);
        }
        if (c=='/')
        {
          for ( ; ; )
          {
            int c = input();
            if ( c == EOF || c == 0 )
              die(-1,"Unfinished comment");
            if ( c == '/' && star) break;
            if ( c == '*' ) star=1;
            else star=0;
            if ( c == '\n' ) linecount++;
          }
        }
        else
        {
          for ( ; ; )
          {
            int c = input();
            if ( c == EOF || c == 0)
              die(-1,"Unfinished comment");
            if ( c == '/' && star) c='\\';
            if ( c == '*' ) star=1;
            else star=0;
            if ( c == '\n' )
            {
              linecount++;
              break;
            }
            if ( c == '\r' )
              continue;
          }
        }
     }
  }


<INITIAL,toplevel>[ \t\r]+
<INITIAL,toplevel>"/*"|"\\\\" {
        int star=0;
        int n;
        int nl=0;
        int lc=linecount;
        if (lastcom==-1)
          lastcom=newcomment();
        n=lastcom;
        pushcomment(n,'/');
        pushcomment(n,'*');
        if (yytext[0]=='/')
        {
          for ( ; ; )
          {
            int c = input();
            if ( c == EOF || c == 0)
              die(-1,"Unfinished comment");
            pushcomment(n,c);
            if ( c == '/' && star) break;
            if ( c == '*' ) star=1;
            else star=0;
            if ( c == '\n' ) linecount++;
          }
        }
        else
        {
          nl=1;
          for ( ; ; )
          {
            int c = input();
            if ( c == EOF || c == 0)
              die(-1,"Unfinished comment");
            if ( c == '/' && star) c='\\';
            if ( c == '*' ) star=1;
            else star=0;
            if ( c == '\n' )
            {
              linecount++;
              break;
            }
            if ( c == '\r' )
              continue;
            pushcomment(n,c);
          }
          pushcomment(n,' ');
          pushcomment(n,'*');
          pushcomment(n,'/');
          pushcomment(n,'\n');
        }
        /*We hack: we put white spaces after comments in the comments
          This makes output looking better in most cases.
          Sadly we can't add white spaces that are before comments.
        */
        for( ; ; )
        {
          int c = input();
          if ( c == EOF || c == 0 )
            return '\n';
          if ( c == '\n' )
          {
            linecount++;
            pushcomment(n,c);
            nl=1;
          }
          else if ( c == ' ' || c == '\t')
          {
            if (nl==0)
              pushcomment(n,c);
              /*We only add spaces on the same line*/
          }
          else if ( c != '\r' )
          {
            unput(c);
            break;
          }
        }
        if (lc<linecount && mode==Mread_lines)
        {
          BEGIN(toplevel);
          return '\n';
        }
      }
<toplevel>. {BEGIN(INITIAL); unput(yytext[0]);}
. return yytext[0];
%%