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-rw-r--r--strlib.c541
1 files changed, 0 insertions, 541 deletions
diff --git a/strlib.c b/strlib.c
deleted file mode 100644
index 6d16043a..00000000
--- a/strlib.c
+++ /dev/null
@@ -1,541 +0,0 @@
1/*
2** strlib.c
3** String library to LUA
4*/
5
6char *rcs_strlib="$Id: strlib.c,v 1.46 1997/06/19 18:49:40 roberto Exp roberto $";
7
8#include <string.h>
9#include <stdio.h>
10#include <stdlib.h>
11#include <ctype.h>
12
13#include "lua.h"
14#include "auxlib.h"
15#include "lualib.h"
16
17
18struct lbuff {
19 char *b;
20 size_t max;
21 size_t size;
22};
23
24static struct lbuff lbuffer = {NULL, 0, 0};
25
26
27static char *strbuffer (unsigned long size)
28{
29 if (size > lbuffer.max) {
30 /* ANSI "realloc" doesn't need this test, but some machines (Sun!)
31 don't follow ANSI */
32 lbuffer.b = (lbuffer.b) ? realloc(lbuffer.b, lbuffer.max=size) :
33 malloc(lbuffer.max=size);
34 if (lbuffer.b == NULL)
35 lua_error("memory overflow");
36 }
37 return lbuffer.b;
38}
39
40static char *openspace (unsigned long size)
41{
42 char *buff = strbuffer(lbuffer.size+size);
43 return buff+lbuffer.size;
44}
45
46char *luaI_addchar (int c)
47{
48 if (lbuffer.size >= lbuffer.max)
49 strbuffer(lbuffer.max == 0 ? 100 : lbuffer.max*2);
50 lbuffer.b[lbuffer.size++] = c;
51 return lbuffer.b;
52}
53
54void luaI_emptybuff (void)
55{
56 lbuffer.size = 0; /* prepare for next string */
57}
58
59
60static void addnchar (char *s, int n)
61{
62 char *b = openspace(n);
63 strncpy(b, s, n);
64 lbuffer.size += n;
65}
66
67static void addstr (char *s)
68{
69 addnchar(s, strlen(s));
70}
71
72
73/*
74** Return the string length
75*/
76static void str_len (void)
77{
78 lua_pushnumber(strlen(luaL_check_string(1)));
79}
80
81/*
82** Return the substring of a string
83*/
84static void str_sub (void)
85{
86 char *s = luaL_check_string(1);
87 long l = strlen(s);
88 long start = (long)luaL_check_number(2);
89 long end = (long)luaL_opt_number(3, -1);
90 if (start < 0) start = l+start+1;
91 if (end < 0) end = l+end+1;
92 if (1 <= start && start <= end && end <= l) {
93 luaI_emptybuff();
94 addnchar(s+start-1, end-start+1);
95 lua_pushstring(luaI_addchar(0));
96 }
97 else lua_pushstring("");
98}
99
100/*
101** Convert a string to lower case.
102*/
103static void str_lower (void)
104{
105 char *s;
106 luaI_emptybuff();
107 for (s = luaL_check_string(1); *s; s++)
108 luaI_addchar(tolower((unsigned char)*s));
109 lua_pushstring(luaI_addchar(0));
110}
111
112/*
113** Convert a string to upper case.
114*/
115static void str_upper (void)
116{
117 char *s;
118 luaI_emptybuff();
119 for (s = luaL_check_string(1); *s; s++)
120 luaI_addchar(toupper((unsigned char)*s));
121 lua_pushstring(luaI_addchar(0));
122}
123
124static void str_rep (void)
125{
126 char *s = luaL_check_string(1);
127 int n = (int)luaL_check_number(2);
128 luaI_emptybuff();
129 while (n-- > 0)
130 addstr(s);
131 lua_pushstring(luaI_addchar(0));
132}
133
134/*
135** get ascii value of a character in a string
136*/
137static void str_ascii (void)
138{
139 char *s = luaL_check_string(1);
140 long pos = (long)luaL_opt_number(2, 1) - 1;
141 luaL_arg_check(0<=pos && pos<strlen(s), 2, "out of range");
142 lua_pushnumber((unsigned char)s[pos]);
143}
144
145
146/* pattern matching */
147
148#define ESC '%'
149#define SPECIALS "^$*?.([%-"
150
151static char *bracket_end (char *p)
152{
153 return (*p == 0) ? NULL : strchr((*p=='^') ? p+2 : p+1, ']');
154}
155
156char *luaL_item_end (char *p)
157{
158 switch (*p++) {
159 case '\0': return p-1;
160 case ESC:
161 if (*p == 0) luaL_verror("incorrect pattern (ends with `%c')", ESC);
162 return p+1;
163 case '[': {
164 char *end = bracket_end(p);
165 if (end == NULL) lua_error("incorrect pattern (missing `]')");
166 return end+1;
167 }
168 default:
169 return p;
170 }
171}
172
173static int matchclass (int c, int cl)
174{
175 int res;
176 switch (tolower((unsigned char)cl)) {
177 case 'a' : res = isalpha((unsigned char)c); break;
178 case 'c' : res = iscntrl((unsigned char)c); break;
179 case 'd' : res = isdigit((unsigned char)c); break;
180 case 'l' : res = islower((unsigned char)c); break;
181 case 'p' : res = ispunct((unsigned char)c); break;
182 case 's' : res = isspace((unsigned char)c); break;
183 case 'u' : res = isupper((unsigned char)c); break;
184 case 'w' : res = isalnum((unsigned char)c); break;
185 default: return (cl == c);
186 }
187 return (islower((unsigned char)cl) ? res : !res);
188}
189
190int luaL_singlematch (int c, char *p)
191{
192 if (c == 0) return 0;
193 switch (*p) {
194 case '.': return 1;
195 case ESC: return matchclass(c, *(p+1));
196 case '[': {
197 char *end = bracket_end(p+1);
198 int sig = *(p+1) == '^' ? (p++, 0) : 1;
199 while (++p < end) {
200 if (*p == ESC) {
201 if (((p+1) < end) && matchclass(c, *++p)) return sig;
202 }
203 else if ((*(p+1) == '-') && (p+2 < end)) {
204 p+=2;
205 if (*(p-2) <= c && c <= *p) return sig;
206 }
207 else if (*p == c) return sig;
208 }
209 return !sig;
210 }
211 default: return (*p == c);
212 }
213}
214
215#define MAX_CAPT 9
216
217static struct {
218 char *init;
219 int len; /* -1 signals unfinished capture */
220} capture[MAX_CAPT];
221
222static int num_captures; /* only valid after a sucessful call to match */
223
224
225static void push_captures (void)
226{
227 int i;
228 for (i=0; i<num_captures; i++) {
229 int l = capture[i].len;
230 char *buff = openspace(l+1);
231 if (l == -1) lua_error("unfinished capture");
232 strncpy(buff, capture[i].init, l);
233 buff[l] = 0;
234 lua_pushstring(buff);
235 }
236}
237
238static int check_cap (int l, int level)
239{
240 l -= '1';
241 if (!(0 <= l && l < level && capture[l].len != -1))
242 lua_error("invalid capture index");
243 return l;
244}
245
246static int capture_to_close (int level)
247{
248 for (level--; level>=0; level--)
249 if (capture[level].len == -1) return level;
250 lua_error("invalid pattern capture");
251 return 0; /* to avoid warnings */
252}
253
254static char *matchbalance (char *s, int b, int e)
255{
256 if (*s != b) return NULL;
257 else {
258 int cont = 1;
259 while (*(++s)) {
260 if (*s == e) {
261 if (--cont == 0) return s+1;
262 }
263 else if (*s == b) cont++;
264 }
265 }
266 return NULL; /* string ends out of balance */
267}
268
269static char *match (char *s, char *p, int level)
270{
271 init: /* using goto's to optimize tail recursion */
272 switch (*p) {
273 case '(': /* start capture */
274 if (level >= MAX_CAPT) lua_error("too many captures");
275 capture[level].init = s;
276 capture[level].len = -1;
277 level++; p++; goto init; /* return match(s, p+1, level); */
278 case ')': { /* end capture */
279 int l = capture_to_close(level);
280 char *res;
281 capture[l].len = s - capture[l].init; /* close capture */
282 if ((res = match(s, p+1, level)) == NULL) /* match failed? */
283 capture[l].len = -1; /* undo capture */
284 return res;
285 }
286 case ESC:
287 if (isdigit((unsigned char)(*(p+1)))) { /* capture */
288 int l = check_cap(*(p+1), level);
289 if (strncmp(capture[l].init, s, capture[l].len) == 0) {
290 /* return match(p+2, s+capture[l].len, level); */
291 p+=2; s+=capture[l].len; goto init;
292 }
293 else return NULL;
294 }
295 else if (*(p+1) == 'b') { /* balanced string */
296 if (*(p+2) == 0 || *(p+3) == 0)
297 lua_error("bad balanced pattern specification");
298 s = matchbalance(s, *(p+2), *(p+3));
299 if (s == NULL) return NULL;
300 else { /* return match(p+4, s, level); */
301 p+=4; goto init;
302 }
303 }
304 else goto dflt;
305 case '\0': case '$': /* (possibly) end of pattern */
306 if (*p == 0 || (*(p+1) == 0 && *s == 0)) {
307 num_captures = level;
308 return s;
309 }
310 else goto dflt;
311 default: dflt: { /* it is a pattern item */
312 int m = luaL_singlematch(*s, p);
313 char *ep = luaL_item_end(p); /* get what is next */
314 switch (*ep) {
315 case '*': { /* repetition */
316 char *res;
317 if (m && (res = match(s+1, p, level)))
318 return res;
319 p=ep+1; goto init; /* else return match(s, ep+1, level); */
320 }
321 case '-': { /* repetition */
322 char *res;
323 if ((res = match(s, ep+1, level)) != 0)
324 return res;
325 else if (m) {
326 s++;
327 goto init; /* return match(s+1, p, level); */
328 }
329 else
330 return NULL;
331 }
332 case '?': { /* optional */
333 char *res;
334 if (m && (res = match(s+1, ep+1, level)))
335 return res;
336 p=ep+1; goto init; /* else return match(s, ep+1, level); */
337 }
338 default:
339 if (m) { s++; p=ep; goto init; } /* return match(s+1, ep, level); */
340 else return NULL;
341 }
342 }
343 }
344}
345
346static void str_find (void)
347{
348 char *s = luaL_check_string(1);
349 char *p = luaL_check_string(2);
350 long init = (long)luaL_opt_number(3, 1) - 1;
351 luaL_arg_check(0 <= init && init <= strlen(s), 3, "out of range");
352 if (lua_getparam(4) != LUA_NOOBJECT ||
353 strpbrk(p, SPECIALS) == NULL) { /* no special caracters? */
354 char *s2 = strstr(s+init, p);
355 if (s2) {
356 lua_pushnumber(s2-s+1);
357 lua_pushnumber(s2-s+strlen(p));
358 }
359 }
360 else {
361 int anchor = (*p == '^') ? (p++, 1) : 0;
362 char *s1=s+init;
363 do {
364 char *res;
365 if ((res=match(s1, p, 0)) != NULL) {
366 lua_pushnumber(s1-s+1); /* start */
367 lua_pushnumber(res-s); /* end */
368 push_captures();
369 return;
370 }
371 } while (*s1++ && !anchor);
372 }
373}
374
375static void add_s (lua_Object newp, lua_Object table, int n)
376{
377 if (lua_isstring(newp)) {
378 char *news = lua_getstring(newp);
379 while (*news) {
380 if (*news != ESC || !isdigit((unsigned char)*++news))
381 luaI_addchar(*news++);
382 else {
383 int l = check_cap(*news++, num_captures);
384 addnchar(capture[l].init, capture[l].len);
385 }
386 }
387 }
388 else if (lua_isfunction(newp)) {
389 lua_Object res;
390 struct lbuff oldbuff;
391 int status;
392 lua_beginblock();
393 if (lua_istable(table)) {
394 lua_pushobject(table);
395 lua_pushnumber(n);
396 }
397 push_captures();
398 /* function may use lbuffer, so save it and create a new one */
399 oldbuff = lbuffer;
400 lbuffer.b = NULL; lbuffer.max = lbuffer.size = 0;
401 status = lua_callfunction(newp);
402 /* restore old buffer */
403 free(lbuffer.b);
404 lbuffer = oldbuff;
405 if (status != 0)
406 lua_error(NULL);
407 res = lua_getresult(1);
408 addstr(lua_isstring(res) ? lua_getstring(res) : "");
409 lua_endblock();
410 }
411 else luaL_arg_check(0, 3, NULL);
412}
413
414static void str_gsub (void)
415{
416 char *src = luaL_check_string(1);
417 char *p = luaL_check_string(2);
418 lua_Object newp = lua_getparam(3);
419 lua_Object table = lua_getparam(4);
420 int max_s = (int)luaL_opt_number(lua_istable(table)?5:4, strlen(src)+1);
421 int anchor = (*p == '^') ? (p++, 1) : 0;
422 int n = 0;
423 luaI_emptybuff();
424 while (n < max_s) {
425 char *e = match(src, p, 0);
426 if (e) {
427 n++;
428 add_s(newp, table, n);
429 }
430 if (e && e>src) /* non empty match? */
431 src = e; /* skip it */
432 else if (*src)
433 luaI_addchar(*src++);
434 else break;
435 if (anchor) break;
436 }
437 addstr(src);
438 lua_pushstring(luaI_addchar(0));
439 lua_pushnumber(n); /* number of substitutions */
440}
441
442static void str_set (void)
443{
444 char *item = luaL_check_string(1);
445 int i;
446 luaL_arg_check(*luaL_item_end(item) == 0, 1, "wrong format");
447 luaI_emptybuff();
448 for (i=1; i<256; i++) /* 0 cannot be part of a set */
449 if (luaL_singlematch(i, item))
450 luaI_addchar(i);
451 lua_pushstring(luaI_addchar(0));
452}
453
454
455void luaI_addquoted (char *s)
456{
457 luaI_addchar('"');
458 for (; *s; s++) {
459 if (strchr("\"\\\n", *s))
460 luaI_addchar('\\');
461 luaI_addchar(*s);
462 }
463 luaI_addchar('"');
464}
465
466#define MAX_FORMAT 200
467
468static void str_format (void)
469{
470 int arg = 1;
471 char *strfrmt = luaL_check_string(arg);
472 luaI_emptybuff(); /* initialize */
473 while (*strfrmt) {
474 if (*strfrmt != '%')
475 luaI_addchar(*strfrmt++);
476 else if (*++strfrmt == '%')
477 luaI_addchar(*strfrmt++); /* %% */
478 else { /* format item */
479 char form[MAX_FORMAT]; /* store the format ('%...') */
480 char *buff;
481 char *initf = strfrmt;
482 form[0] = '%';
483 strfrmt = match(strfrmt, "%d?%$?[-+ #]*(%d*)%.?(%d*)", 0);
484 if (capture[0].len > 3 || capture[1].len > 3) /* < 1000? */
485 lua_error("invalid format (width or precision too long)");
486 if (isdigit((unsigned char)initf[0]) && initf[1] == '$') {
487 arg = initf[0] - '0';
488 initf += 2; /* skip the 'n$' */
489 }
490 arg++;
491 strncpy(form+1, initf, strfrmt-initf+1); /* +1 to include convertion */
492 form[strfrmt-initf+2] = 0;
493 buff = openspace(1000); /* to store the formated value */
494 switch (*strfrmt++) {
495 case 'q':
496 luaI_addquoted(luaL_check_string(arg));
497 continue;
498 case 's': {
499 char *s = luaL_check_string(arg);
500 buff = openspace(strlen(s));
501 sprintf(buff, form, s);
502 break;
503 }
504 case 'c': case 'd': case 'i': case 'o':
505 case 'u': case 'x': case 'X':
506 sprintf(buff, form, (int)luaL_check_number(arg));
507 break;
508 case 'e': case 'E': case 'f': case 'g':
509 sprintf(buff, form, luaL_check_number(arg));
510 break;
511 default: /* also treat cases 'pnLlh' */
512 lua_error("invalid format option in function `format'");
513 }
514 lbuffer.size += strlen(buff);
515 }
516 }
517 lua_pushstring(luaI_addchar(0)); /* push the result */
518}
519
520
521static struct luaL_reg strlib[] = {
522{"strlen", str_len},
523{"strsub", str_sub},
524{"strset", str_set},
525{"strlower", str_lower},
526{"strupper", str_upper},
527{"strrep", str_rep},
528{"ascii", str_ascii},
529{"format", str_format},
530{"strfind", str_find},
531{"gsub", str_gsub}
532};
533
534
535/*
536** Open string library
537*/
538void strlib_open (void)
539{
540 luaL_openlib(strlib, (sizeof(strlib)/sizeof(strlib[0])));
541}
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