1 rizwank 1.1 /*
2 * Internal definitions for states.
3 * Copyright (c) 1997-1998 Markku Rossi.
4 *
5 * Author: Markku Rossi <mtr@iki.fi>
6 */
7
8 /*
9 * This file is part of GNU enscript.
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2, or (at your option)
14 * any later version.
15 *
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
20 *
21 * You should have received a copy of the GNU General Public License
22 rizwank 1.1 * along with this program; see the file COPYING. If not, write to
23 * the Free Software Foundation, 59 Temple Place - Suite 330,
24 * Boston, MA 02111-1307, USA.
25 */
26
27 #ifndef DEFS_H
28 #define DEFS_H
29
30 /*
31 * Config stuffs.
32 */
33
34 #ifdef HAVE_CONFIG_H
35 #include <config.h>
36 #endif
37
38 #include <stdio.h>
39 #include <ctype.h>
40
41 #ifndef ___P
42 #if PROTOTYPES
43 rizwank 1.1 #define ___P(protos) protos
44 #else /* no PROTOTYPES */
45 #define ___P(protos) ()
46 #endif /* no PROTOTYPES */
47 #endif
48
49 #if STDC_HEADERS
50
51 #include <stdlib.h>
52 #include <string.h>
53
54 #else /* no STDC_HEADERS */
55
56 #if HAVE_STDLIB_H
57 #include <stdlib.h>
58 #endif
59
60 #if HAVE_STRING_H
61 #include <string.h>
62 #endif
63
64 rizwank 1.1 #ifndef HAVE_STRCHR
65 #define strchr index
66 #define strrchr rindex
67 #endif
68 char *strchr ();
69 char *strrchr ();
70
71 #ifndef HAVE_STRERROR
72 extern char *strerror ___P ((int));
73 #endif
74
75 #ifndef HAVE_MEMMOVE
76 extern void *memmove ___P ((void *, void *, size_t));
77 #endif
78
79 #ifndef HAVE_MEMCPY
80 extern void *memcpy ___P ((void *, void *, size_t));
81 #endif
82
83 #endif /* no STDC_HEADERS */
84
85 rizwank 1.1 #if HAVE_UNISTD_H
86 #include <unistd.h>
87 #endif
88
89 #include <errno.h>
90
91 #if HAVE_SYS_TYPES_H
92 #include <sys/types.h>
93 #endif
94
95 #if HAVE_SYS_STAT_H
96 #include <sys/stat.h>
97 #endif
98
99 #if ENABLE_NLS
100 #include <libintl.h>
101 #define _(String) gettext (String)
102 #else
103 #define _(String) String
104 #endif
105
106 rizwank 1.1 #if HAVE_LC_MESSAGES
107 #include <locale.h>
108 #endif
109
110 #include "regex.h"
111 #include "xalloc.h"
112 #include "strhash.h"
113
114 /*
115 * Types and definitions.
116 */
117
118 #define RULE_BEGIN ((void *) 0)
119 #define RULE_END ((void *) 1)
120
121 #define INBUFSIZE (20 * 1024)
122
123 #define IS_TRUE(n) ((n)->type != nINTEGER || (n)->u.integer != 0)
124
125 #define REGEXP(regexp) \
126 ((regexp)->u.re.compiled.fastmap_accurate \
127 rizwank 1.1 ? (&(regexp)->u.re.compiled) \
128 : (compile_regexp (regexp), &(regexp)->u.re.compiled))
129
130 /* Flags for regular expressions. */
131 #define fRE_CASE_INSENSITIVE 1
132
133 /* Generic linked list. */
134
135 struct list_item_st
136 {
137 struct list_item_st *next;
138 void *data;
139 };
140
141 typedef struct list_item_st ListItem;
142
143 struct list_st
144 {
145 ListItem *head;
146 ListItem *tail;
147 };
148 rizwank 1.1
149 typedef struct list_st List;
150
151 /* State. */
152
153 struct state_st
154 {
155 char *name;
156 char *super_name;
157 struct state_st *super;
158 List *rules;
159 };
160
161 typedef struct state_st State;
162
163
164 /* Node. */
165
166 typedef enum
167 {
168 nVOID,
169 rizwank 1.1 nSTRING,
170 nREGEXP,
171 nINTEGER,
172 nREAL,
173 nSYMBOL,
174 nARRAY
175 } NodeType;
176
177 struct node_st
178 {
179 NodeType type;
180 unsigned int refcount;
181 unsigned int linenum;
182 char *filename;
183
184 union
185 {
186 struct
187 {
188 char *data;
189 unsigned int len;
190 rizwank 1.1 } str;
191 struct
192 {
193 char *data;
194 unsigned int len;
195 unsigned int flags;
196 regex_t compiled;
197 struct re_registers matches;
198 } re;
199 int integer;
200 double real;
201 char *sym;
202 struct
203 {
204 struct node_st **array;
205 unsigned int len;
206 unsigned int allocated;
207 } array;
208 } u;
209 };
210
211 rizwank 1.1 typedef struct node_st Node;
212
213 /* Cons cell. */
214 struct cons_st
215 {
216 void *car;
217 void *cdr;
218 };
219
220 typedef struct cons_st Cons;
221
222 /* Grammar types. */
223
224 typedef enum
225 {
226 eSTRING,
227 eREGEXP,
228 eINTEGER,
229 eREAL,
230 eSYMBOL,
231 eNOT,
232 rizwank 1.1 eAND,
233 eOR,
234 eFCALL,
235 eASSIGN,
236 eADDASSIGN,
237 eSUBASSIGN,
238 eMULASSIGN,
239 eDIVASSIGN,
240 ePOSTFIXADD,
241 ePOSTFIXSUB,
242 ePREFIXADD,
243 ePREFIXSUB,
244 eARRAYASSIGN,
245 eARRAYREF,
246 eQUESTCOLON,
247 eMULT,
248 eDIV,
249 ePLUS,
250 eMINUS,
251 eLT,
252 eGT,
253 rizwank 1.1 eEQ,
254 eNE,
255 eGE,
256 eLE
257 } ExprType;
258
259 struct expr_st
260 {
261 ExprType type;
262 unsigned int linenum;
263 char *filename;
264
265 union
266 {
267 Node *node;
268 struct expr_st *not;
269 struct
270 {
271 Node *name;
272 List *args;
273 } fcall;
274 rizwank 1.1 struct
275 {
276 Node *sym;
277 struct expr_st *expr;
278 } assign;
279 struct
280 {
281 struct expr_st *expr1;
282 struct expr_st *expr2;
283 struct expr_st *expr3;
284 } arrayassign;
285 struct
286 {
287 struct expr_st *expr1;
288 struct expr_st *expr2;
289 } arrayref;
290 struct
291 {
292 struct expr_st *cond;
293 struct expr_st *expr1;
294 struct expr_st *expr2;
295 rizwank 1.1 } questcolon;
296 struct
297 {
298 struct expr_st *left;
299 struct expr_st *right;
300 } op;
301 } u;
302 };
303
304 typedef struct expr_st Expr;
305
306 typedef enum
307 {
308 sRETURN,
309 sDEFSUB,
310 sBLOCK,
311 sIF,
312 sEXPR,
313 sWHILE,
314 sFOR
315 } StmtType;
316 rizwank 1.1
317 struct stmt_st
318 {
319 StmtType type;
320 unsigned int linenum;
321 char *filename;
322
323 union
324 {
325 Expr *expr;
326 struct
327 {
328 Node *name;
329 Cons *closure;
330 } defsub;
331 struct
332 {
333 Expr *expr;
334 struct stmt_st *then_stmt;
335 struct stmt_st *else_stmt;
336 } stmt_if;
337 rizwank 1.1 struct
338 {
339 Expr *expr;
340 struct stmt_st *body;
341 } stmt_while;
342 struct
343 {
344 Expr *init;
345 Expr *cond;
346 Expr *incr;
347 struct stmt_st *body;
348 } stmt_for;
349 List *block;
350 } u;
351 };
352
353 typedef struct stmt_st Stmt;
354
355 struct environment_st
356 {
357 struct environment_st *next;
358 rizwank 1.1 char *name;
359 Node *val;
360 };
361
362 typedef struct environment_st Environment;
363
364 /* Primitive procedure. */
365 typedef Node *(*Primitive) ___P ((char *prim_name, List *args,
366 Environment *env, char *filename,
367 unsigned int linenum));
368
369 /* Variable definition chain. */
370 struct variable_definition_st
371 {
372 struct variable_definition_st *next;
373 char *sym;
374 char *val;
375 };
376
377 typedef struct variable_definition_st VariableDef;
378
379 rizwank 1.1 /* Grammar and execution warning levels. */
380 typedef enum
381 {
382 WARN_LIGHT = 10,
383 WARN_ALL = 100
384 } WarningLevel;
385
386
387 /*
388 * Global variables.
389 */
390
391 extern char *program;
392
393 extern FILE *yyin;
394 extern FILE *ofp;
395 extern char *defs_file;
396 extern unsigned int linenum;
397 extern char *yyin_name;
398 extern WarningLevel warning_level;
399 extern char *path;
400 rizwank 1.1 extern unsigned int verbose;
401
402 /* Namespaces. */
403 extern StringHashPtr ns_prims;
404 extern StringHashPtr ns_vars;
405 extern StringHashPtr ns_subs;
406 extern StringHashPtr ns_states;
407
408 extern List *global_stmts;
409 extern List *start_stmts;
410 extern List *startrules;
411 extern List *namerules;
412
413 /* Void node value. There is only nvoid instance. */
414 extern Node *nvoid;
415
416 extern FILE *ifp;
417 extern char *inbuf;
418 extern unsigned int data_in_buffer;
419 extern unsigned int bufpos;
420 extern int eof_seen;
421 rizwank 1.1 extern char *current_fname;
422 extern unsigned int current_linenum;
423
424 extern struct re_registers *current_match;
425 extern char *current_match_buf;
426
427 /* Options. */
428
429 extern char *start_state_arg;
430 extern char *start_state;
431
432
433 /*
434 * Prototypes for global functions.
435 */
436
437 void init_primitives ();
438
439 /* Parser & lexer. */
440 int yyparse ();
441 int yylex ();
442 rizwank 1.1 void yyerror ___P ((char *msg));
443
444 /* Generic linked list. */
445
446 /* Create a new linked list. */
447 List *list ();
448
449 /* Add a new element <data> to the beginning of list <list>. */
450 void list_prepend ___P ((List *list, void *data));
451
452 /* Add a new element <data> to the end of list <list>. */
453 void list_append ___P ((List *list, void *data));
454
455
456 /* Node manipulators. */
457
458 Node *node_alloc ___P ((NodeType type));
459
460 Node *node_copy ___P ((Node *node));
461
462 void node_reference ___P ((Node *node));
463 rizwank 1.1
464 void node_free ___P ((Node *node));
465
466 void enter_system_variable ___P ((char *name, char *value));
467
468 void compile_regexp ___P ((Node *regexp));
469
470
471 /* Grammar constructors. */
472
473 Stmt *mk_stmt ___P ((StmtType type, void *arg1, void *arg2, void *arg3,
474 void *arg4));
475
476 Expr *mk_expr ___P ((ExprType type, void *arg1, void *arg2, void *arg3));
477
478 Cons *cons ___P ((void *car, void *cdr));
479
480 void define_state ___P ((Node *sym, Node *super, List *rules));
481
482 /* Execution. */
483
484 rizwank 1.1 Node *eval_expr ___P ((Expr *expr, Environment *env));
485
486 Node *eval_statement ___P ((Stmt *stmt, Environment *env, int *return_seen));
487
488 Node *eval_statement_list ___P ((List *lst, Environment *env,
489 int *return_seen));
490
491 void process_file ___P ((char *fname));
492
493 Node *execute_state ___P ((char *name));
494
495 void load_states_file ___P ((char *name));
496
497 /*
498 * Lookup state <name> and return its handle. If the state is
499 * undefined, the function tries to autoload it.
500 */
501 State *lookup_state ___P ((char *name));
502
503 #endif /* not DEFS_H */
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