source: buchla-68k/ram/cminit.c@ f40a309

Last change on this file since f40a309 was f40a309, checked in by Thomas Lopatic <thomas@…>, 7 years ago

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1/*
2 =============================================================================
3 cminit.c -- C-Meta parser functions
4 Version 5 -- 1987-07-10 -- D.N. Lynx Crowe
5
6 Some parser functions in C, modelled after HyperMeta(tm).
7 Designed for, but not dedicated to, LR(k), top-down, recursive parsing.
8 =============================================================================
9*/
10
11#include <stddefs.h>
12#include <ctype.h>
13
14#define CM_MXSTR 257 /* maximum parser string result length */
15
16#define CM_DBLK if (!QQanch) while (*QQip EQ ' ') ++QQip
17
18int QQsw; /* parser result switch */
19int QQanch; /* parser anchored match switch */
20
21char *QQin; /* parser initial input pointer */
22char *QQip; /* parser current input pointer */
23char *QQop; /* parser string output pointer */
24
25long QQnum; /* parser numeric result */
26int QQlnum; /* parser list element number result */
27char QQdig; /* parser digit result */
28char QQchr; /* parser character result */
29
30char QQstr[CM_MXSTR]; /* parser string result */
31
32/*
33
34*/
35
36/*
37 =============================================================================
38 CMinit(ip) -- initialize the parser to work on the string at 'ip'.
39 =============================================================================
40*/
41
42int
43CMinit(ip)
44char *ip;
45{
46 register int i;
47 register char *t;
48
49 QQip = ip;
50 QQin = ip;
51 QQsw = TRUE;
52 QQanch = FALSE;
53 QQdig = '?';
54 QQchr = '?';
55 QQnum = 0;
56 QQop = QQstr;
57 t = QQstr;
58
59 for (i = 0; i < CM_MXSTR; i++)
60 *t++ = '\0';
61}
62
63/*
64
65*/
66
67/*
68 =============================================================================
69 CMchr(c) -- attempt to match character 'c' in the input.
70 =============================================================================
71*/
72
73int
74CMchr(c)
75char c;
76{
77 CM_DBLK;
78
79 if (c NE *QQip)
80 return(QQsw = FALSE);
81
82 QQchr = *QQip++;
83 return(QQsw = TRUE);
84}
85
86/*
87
88*/
89
90/*
91 =============================================================================
92 CMuchr(c) -- attempt to match character 'c' in the input, ignoring case.
93 =============================================================================
94*/
95
96int
97CMuchr(c)
98register char c;
99{
100 register char t;
101
102 CM_DBLK;
103
104 t = *QQip;
105
106 if (isascii(c))
107 if (isupper(c))
108 c = _tolower(c);
109
110 if (isascii(t))
111 if (isupper(t))
112 t = _tolower(t);
113
114 if (c NE t)
115 return(QQsw = FALSE);
116
117 QQchr = *QQip++;
118 return(QQsw = TRUE);
119}
120
121/*
122
123*/
124
125/*
126 =============================================================================
127 CMstr(s) -- attempt to match string at 's' in the input.
128 =============================================================================
129*/
130
131int
132CMstr(s)
133char *s;
134{
135 register char *t;
136 char *q;
137
138 CM_DBLK;
139
140 t = QQip;
141 q = s;
142
143 while (*s) {
144
145 if (*t++ NE *s++)
146 return(QQsw = FALSE);
147 }
148
149 QQop = QQstr;
150
151 while (*QQop++ = *q++) ;
152
153 QQip = t;
154 return(QQsw = TRUE);
155}
156
157/*
158
159*/
160
161/*
162 =============================================================================
163 CMustr(s) -- attempt to match string 's' in the input, ignoring case.
164 =============================================================================
165*/
166
167int
168CMustr(s)
169register char *s;
170{
171 register char *t, t1, t2;
172 char *q;
173
174 CM_DBLK;
175
176 t = QQip;
177 q = s;
178
179 while (*s) {
180
181 t1 = *t++;
182 t2 = *s++;
183
184 if (isascii(t1))
185 if (isupper(t1))
186 t1 = _tolower(t1);
187
188 if (isascii(t2))
189 if (isupper(t2))
190 t2 = _tolower(t2);
191
192 if (t1 NE t2)
193 return(QQsw = FALSE);
194 }
195
196 QQop = QQstr;
197
198 while (*QQop++ = *q++) ;
199
200 QQip = t;
201 return(QQsw = TRUE);
202}
203
204/*
205
206*/
207
208/*
209 =============================================================================
210 CMlong() -- attempt to parse a digit string in the input as a long.
211 =============================================================================
212*/
213
214int
215CMlong()
216{
217 register char *p;
218 register long n;
219 register char c;
220
221 CM_DBLK;
222
223 p = QQip;
224 n = 0L;
225 c = *p++;
226
227 if (!isascii(c))
228 return(QQsw = FALSE);
229
230 if (!isdigit(c))
231 return(QQsw = FALSE);
232
233 n = c - '0';
234
235 while (c = *p) {
236
237 if (!isascii(c))
238 break;
239
240 if (!isdigit(c))
241 break;
242
243 n = (n * 10) + (c - '0');
244 ++p;
245 }
246
247 QQip = p;
248 QQnum = n;
249 return(QQsw = TRUE);
250}
251
252/*
253
254*/
255
256/*
257 =============================================================================
258 CMdig() -- attempt to match a digit in the input string.
259 =============================================================================
260*/
261
262int
263CMdig()
264{
265 register char c;
266
267 CM_DBLK;
268
269 c = *QQip;
270
271 if (!isascii(c))
272 return(QQsw = FALSE);
273
274 if (!isdigit(c))
275 return(QQsw = FALSE);
276
277 QQdig = c;
278 ++QQip;
279 return(QQsw = TRUE);
280}
281
282/*
283
284*/
285
286/*
287 =============================================================================
288 CMlist(l) -- attempt to match a string from the list 'l' in the input.
289 =============================================================================
290*/
291
292int
293CMlist(l)
294register char *l[];
295{
296 register int n;
297 register char *p, *q;
298
299 CM_DBLK;
300
301 n = 0;
302
303 while (p = *l++) {
304
305 q = p;
306
307 if (CMstr(p)) {
308
309 QQop = QQstr;
310
311 while (*QQop++ = *q++) ;
312
313 QQlnum = n;
314 return(QQsw = TRUE);
315 }
316
317 ++n;
318 }
319
320 return(QQsw = FALSE);
321}
322
323/*
324
325*/
326
327/*
328 =============================================================================
329 CMulist(l) -- attempt to match a string from the list 'l' in the input
330 ignoring case in both the list and the input string.
331 =============================================================================
332*/
333
334int
335CMulist(l)
336register char *l[];
337{
338 register int n;
339 register char *p, *q;
340
341 CM_DBLK;
342
343 n = 0;
344
345 while (p = *l++) {
346
347 q = p;
348
349 if (CMustr(p)) {
350
351 QQop = QQstr;
352
353 while (*QQop++ = *q++) ;
354
355 QQlnum = n;
356 return(QQsw = TRUE);
357 }
358
359 ++n;
360 }
361
362 return(QQsw = FALSE);
363}
364
365/*
366
367*/
368
369/*
370 =============================================================================
371 CMstat(msg) -- output 'msg and dump parser status. Returns QQsw.
372 =============================================================================
373*/
374
375int
376CMstat(msg)
377char *msg;
378{
379 register char *tp;
380
381 tp = QQin;
382 printf("%s\r\n", msg);
383 printf(" QQsw: %s, QQanch: %s, QQchr: 0x%02x <%c>, QQdig: %c\r\n",
384 (QQsw ? "OK" : "NOGO"), (QQanch ? "anchored" : "deblanked"),
385 QQchr, (isascii(QQchr) ? (isprint(QQchr) ? QQchr : ' ') : ' '),
386 QQdig);
387 printf(" QQnum: %ld, QQlnum: %d\r\n", QQnum, QQlnum);
388 printf(" QQstr: %s\r\n", QQstr);
389 printf(" {%s}\r\n", QQin);
390 printf(" ");
391
392 while (tp++ NE QQip)
393 printf(" ");
394
395 printf("^\r\n");
396 return(QQsw);
397}
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