CHDK_DE Vorschauversion  Trunk Rev. 5272
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lstrlib.c-Dateireferenz
#include <ctype.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "lua.h"
#include "lauxlib.h"
#include "lualib.h"
+ Include-Abhängigkeitsdiagramm für lstrlib.c:

gehe zum Quellcode dieser Datei

Datenstrukturen

struct  MatchState
 

Makrodefinitionen

#define lstrlib_c
 
#define LUA_LIB
 
#define uchar(c)   ((unsigned char)(c))
 
#define CAP_UNFINISHED   (-1)
 
#define CAP_POSITION   (-2)
 
#define L_ESC   '%'
 
#define SPECIALS   "^$*+?.([%-"
 
#define MAX_ITEM   512
 
#define FLAGS   "-+ #0"
 
#define MAX_FORMAT   (sizeof(FLAGS) + sizeof(LUA_INTFRMLEN) + 10)
 

Typdefinitionen

typedef struct MatchState MatchState
 

Funktionen

static int str_len (lua_State *L)
 
static ptrdiff_t posrelat (ptrdiff_t pos, size_t len)
 
static int str_sub (lua_State *L)
 
static int str_reverse (lua_State *L)
 
static int str_lower (lua_State *L)
 
static int str_upper (lua_State *L)
 
static int str_rep (lua_State *L)
 
static int str_byte (lua_State *L)
 
static int str_char (lua_State *L)
 
static int writer (lua_State *L, const void *b, size_t size, void *B)
 
static int str_dump (lua_State *L)
 
static int check_capture (MatchState *ms, int l)
 
static int capture_to_close (MatchState *ms)
 
static const char * classend (MatchState *ms, const char *p)
 
static int match_class (int c, int cl)
 
static int matchbracketclass (int c, const char *p, const char *ec)
 
static int singlematch (int c, const char *p, const char *ep)
 
static const char * match (MatchState *ms, const char *s, const char *p)
 
static const char * matchbalance (MatchState *ms, const char *s, const char *p)
 
static const char * max_expand (MatchState *ms, const char *s, const char *p, const char *ep)
 
static const char * min_expand (MatchState *ms, const char *s, const char *p, const char *ep)
 
static const char * start_capture (MatchState *ms, const char *s, const char *p, int what)
 
static const char * end_capture (MatchState *ms, const char *s, const char *p)
 
static const char * match_capture (MatchState *ms, const char *s, int l)
 
static const char * lmemfind (const char *s1, size_t l1, const char *s2, size_t l2)
 
static void push_onecapture (MatchState *ms, int i, const char *s, const char *e)
 
static int push_captures (MatchState *ms, const char *s, const char *e)
 
static int str_find_aux (lua_State *L, int find)
 
static int str_find (lua_State *L)
 
static int str_match (lua_State *L)
 
static int gmatch_aux (lua_State *L)
 
static int gmatch (lua_State *L)
 
static int gfind_nodef (lua_State *L)
 
static void add_s (MatchState *ms, luaL_Buffer *b, const char *s, const char *e)
 
static void add_value (MatchState *ms, luaL_Buffer *b, const char *s, const char *e)
 
static int str_gsub (lua_State *L)
 
static void addquoted (lua_State *L, luaL_Buffer *b, int arg)
 
static const char * scanformat (lua_State *L, const char *strfrmt, char *form)
 
static void addintlen (char *form)
 
static int str_format (lua_State *L)
 
static void createmetatable (lua_State *L)
 
LUALIB_API int luaopen_string (lua_State *L)
 

Variablen

static const luaL_Reg strlib []
 

Makro-Dokumentation

#define CAP_POSITION   (-2)

Definiert in Zeile 168 der Datei lstrlib.c.

#define CAP_UNFINISHED   (-1)

Definiert in Zeile 167 der Datei lstrlib.c.

#define FLAGS   "-+ #0"

Definiert in Zeile 688 der Datei lstrlib.c.

#define L_ESC   '%'

Definiert in Zeile 182 der Datei lstrlib.c.

#define lstrlib_c

Definiert in Zeile 14 der Datei lstrlib.c.

#define LUA_LIB

Definiert in Zeile 15 der Datei lstrlib.c.

#define MAX_FORMAT   (sizeof(FLAGS) + sizeof(LUA_INTFRMLEN) + 10)

Definiert in Zeile 693 der Datei lstrlib.c.

#define MAX_ITEM   512

Definiert in Zeile 686 der Datei lstrlib.c.

#define SPECIALS   "^$*+?.([%-"

Definiert in Zeile 183 der Datei lstrlib.c.

#define uchar (   c)    ((unsigned char)(c))

Definiert in Zeile 24 der Datei lstrlib.c.

Dokumentation der benutzerdefinierten Typen

typedef struct MatchState MatchState

Dokumentation der Funktionen

static void add_s ( MatchState ms,
luaL_Buffer b,
const char *  s,
const char *  e 
)
static

Definiert in Zeile 590 der Datei lstrlib.c.

591  {
592  size_t l, i;
593  const char *news = lua_tolstring(ms->L, 3, &l);
594  for (i = 0; i < l; i++) {
595  if (news[i] != L_ESC)
596  luaL_addchar(b, news[i]);
597  else {
598  i++; /* skip ESC */
599  if (!isdigit(uchar(news[i])))
600  luaL_addchar(b, news[i]);
601  else if (news[i] == '0')
602  luaL_addlstring(b, s, e - s);
603  else {
604  push_onecapture(ms, news[i] - '1', s, e);
605  luaL_addvalue(b); /* add capture to accumulated result */
606  }
607  }
608  }
609 }
static void add_value ( MatchState ms,
luaL_Buffer b,
const char *  s,
const char *  e 
)
static

Definiert in Zeile 612 der Datei lstrlib.c.

613  {
614  lua_State *L = ms->L;
615  switch (lua_type(L, 3)) {
616  case LUA_TNUMBER:
617  case LUA_TSTRING: {
618  add_s(ms, b, s, e);
619  return;
620  }
621  case LUA_TFUNCTION: {
622  int n;
623  lua_pushvalue(L, 3);
624  n = push_captures(ms, s, e);
625  lua_call(L, n, 1);
626  break;
627  }
628  case LUA_TTABLE: {
629  push_onecapture(ms, 0, s, e);
630  lua_gettable(L, 3);
631  break;
632  }
633  }
634  if (!lua_toboolean(L, -1)) { /* nil or false? */
635  lua_pop(L, 1);
636  lua_pushlstring(L, s, e - s); /* keep original text */
637  }
638  else if (!lua_isstring(L, -1))
639  luaL_error(L, "invalid replacement value (a %s)", luaL_typename(L, -1));
640  luaL_addvalue(b); /* add result to accumulator */
641 }
static void addintlen ( char *  form)
static

Definiert in Zeile 747 der Datei lstrlib.c.

747  {
748  size_t l = strlen(form);
749  char spec = form[l - 1];
750  strcpy(form + l - 1, LUA_INTFRMLEN);
751  form[l + sizeof(LUA_INTFRMLEN) - 2] = spec;
752  form[l + sizeof(LUA_INTFRMLEN) - 1] = '\0';
753 }
static void addquoted ( lua_State L,
luaL_Buffer b,
int  arg 
)
static

Definiert in Zeile 696 der Datei lstrlib.c.

696  {
697  size_t l;
698  const char *s = luaL_checklstring(L, arg, &l);
699  luaL_addchar(b, '"');
700  while (l--) {
701  switch (*s) {
702  case '"': case '\\': case '\n': {
703  luaL_addchar(b, '\\');
704  luaL_addchar(b, *s);
705  break;
706  }
707  case '\r': {
708  luaL_addlstring(b, "\\r", 2);
709  break;
710  }
711  case '\0': {
712  luaL_addlstring(b, "\\000", 4);
713  break;
714  }
715  default: {
716  luaL_addchar(b, *s);
717  break;
718  }
719  }
720  s++;
721  }
722  luaL_addchar(b, '"');
723 }
static int capture_to_close ( MatchState ms)
static

Definiert in Zeile 194 der Datei lstrlib.c.

194  {
195  int level = ms->level;
196  for (level--; level>=0; level--)
197  if (ms->capture[level].len == CAP_UNFINISHED) return level;
198  return luaL_error(ms->L, "invalid pattern capture");
199 }
static int check_capture ( MatchState ms,
int  l 
)
static

Definiert in Zeile 186 der Datei lstrlib.c.

186  {
187  l -= '1';
188  if (l < 0 || l >= ms->level || ms->capture[l].len == CAP_UNFINISHED)
189  return luaL_error(ms->L, "invalid capture index");
190  return l;
191 }
static const char* classend ( MatchState ms,
const char *  p 
)
static

Definiert in Zeile 202 der Datei lstrlib.c.

202  {
203  switch (*p++) {
204  case L_ESC: {
205  if (*p == '\0')
206  luaL_error(ms->L, "malformed pattern (ends with " LUA_QL("%%") ")");
207  return p+1;
208  }
209  case '[': {
210  if (*p == '^') p++;
211  do { /* look for a `]' */
212  if (*p == '\0')
213  luaL_error(ms->L, "malformed pattern (missing " LUA_QL("]") ")");
214  if (*(p++) == L_ESC && *p != '\0')
215  p++; /* skip escapes (e.g. `%]') */
216  } while (*p != ']');
217  return p+1;
218  }
219  default: {
220  return p;
221  }
222  }
223 }
static void createmetatable ( lua_State L)
static

Definiert in Zeile 847 der Datei lstrlib.c.

847  {
848  lua_createtable(L, 0, 1); /* create metatable for strings */
849  lua_pushliteral(L, ""); /* dummy string */
850  lua_pushvalue(L, -2);
851  lua_setmetatable(L, -2); /* set string metatable */
852  lua_pop(L, 1); /* pop dummy string */
853  lua_pushvalue(L, -2); /* string library... */
854  lua_setfield(L, -2, "__index"); /* ...is the __index metamethod */
855  lua_pop(L, 1); /* pop metatable */
856 }
static const char* end_capture ( MatchState ms,
const char *  s,
const char *  p 
)
static

Definiert in Zeile 343 der Datei lstrlib.c.

344  {
345  int l = capture_to_close(ms);
346  const char *res;
347  ms->capture[l].len = s - ms->capture[l].init; /* close capture */
348  if ((res = match(ms, s, p)) == NULL) /* match failed? */
349  ms->capture[l].len = CAP_UNFINISHED; /* undo capture */
350  return res;
351 }
static int gfind_nodef ( lua_State L)
static

Definiert in Zeile 584 der Datei lstrlib.c.

584  {
585  return luaL_error(L, LUA_QL("string.gfind") " was renamed to "
586  LUA_QL("string.gmatch"));
587 }
static int gmatch ( lua_State L)
static

Definiert in Zeile 574 der Datei lstrlib.c.

574  {
575  luaL_checkstring(L, 1);
576  luaL_checkstring(L, 2);
577  lua_settop(L, 2);
578  lua_pushinteger(L, 0);
580  return 1;
581 }
static int gmatch_aux ( lua_State L)
static

Definiert in Zeile 548 der Datei lstrlib.c.

548  {
549  MatchState ms;
550  size_t ls;
551  const char *s = lua_tolstring(L, lua_upvalueindex(1), &ls);
552  const char *p = lua_tostring(L, lua_upvalueindex(2));
553  const char *src;
554  ms.L = L;
555  ms.src_init = s;
556  ms.src_end = s+ls;
557  for (src = s + (size_t)lua_tointeger(L, lua_upvalueindex(3));
558  src <= ms.src_end;
559  src++) {
560  const char *e;
561  ms.level = 0;
562  if ((e = match(&ms, src, p)) != NULL) {
563  lua_Integer newstart = e-s;
564  if (e == src) newstart++; /* empty match? go at least one position */
565  lua_pushinteger(L, newstart);
567  return push_captures(&ms, src, e);
568  }
569  }
570  return 0; /* not found */
571 }
static const char* lmemfind ( const char *  s1,
size_t  l1,
const char *  s2,
size_t  l2 
)
static

Definiert in Zeile 444 der Datei lstrlib.c.

445  {
446  if (l2 == 0) return s1; /* empty strings are everywhere */
447  else if (l2 > l1) return NULL; /* avoids a negative `l1' */
448  else {
449  const char *init; /* to search for a `*s2' inside `s1' */
450  l2--; /* 1st char will be checked by `memchr' */
451  l1 = l1-l2; /* `s2' cannot be found after that */
452  while (l1 > 0 && (init = (const char *)memchr(s1, *s2, l1)) != NULL) {
453  init++; /* 1st char is already checked */
454  if (memcmp(init, s2+1, l2) == 0)
455  return init-1;
456  else { /* correct `l1' and `s1' to try again */
457  l1 -= init-s1;
458  s1 = init;
459  }
460  }
461  return NULL; /* not found */
462  }
463 }
LUALIB_API int luaopen_string ( lua_State L)

Definiert in Zeile 862 der Datei lstrlib.c.

862  {
864 #if defined(LUA_COMPAT_GFIND)
865  lua_getfield(L, -1, "gmatch");
866  lua_setfield(L, -2, "gfind");
867 #endif
868  createmetatable(L);
869  return 1;
870 }
static const char * match ( MatchState ms,
const char *  s,
const char *  p 
)
static

Definiert in Zeile 365 der Datei lstrlib.c.

365  {
366  init: /* using goto's to optimize tail recursion */
367  switch (*p) {
368  case '(': { /* start capture */
369  if (*(p+1) == ')') /* position capture? */
370  return start_capture(ms, s, p+2, CAP_POSITION);
371  else
372  return start_capture(ms, s, p+1, CAP_UNFINISHED);
373  }
374  case ')': { /* end capture */
375  return end_capture(ms, s, p+1);
376  }
377  case L_ESC: {
378  switch (*(p+1)) {
379  case 'b': { /* balanced string? */
380  s = matchbalance(ms, s, p+2);
381  if (s == NULL) return NULL;
382  p+=4; goto init; /* else return match(ms, s, p+4); */
383  }
384  case 'f': { /* frontier? */
385  const char *ep; char previous;
386  p += 2;
387  if (*p != '[')
388  luaL_error(ms->L, "missing " LUA_QL("[") " after "
389  LUA_QL("%%f") " in pattern");
390  ep = classend(ms, p); /* points to what is next */
391  previous = (s == ms->src_init) ? '\0' : *(s-1);
392  if (matchbracketclass(uchar(previous), p, ep-1) ||
393  !matchbracketclass(uchar(*s), p, ep-1)) return NULL;
394  p=ep; goto init; /* else return match(ms, s, ep); */
395  }
396  default: {
397  if (isdigit(uchar(*(p+1)))) { /* capture results (%0-%9)? */
398  s = match_capture(ms, s, uchar(*(p+1)));
399  if (s == NULL) return NULL;
400  p+=2; goto init; /* else return match(ms, s, p+2) */
401  }
402  goto dflt; /* case default */
403  }
404  }
405  }
406  case '\0': { /* end of pattern */
407  return s; /* match succeeded */
408  }
409  case '$': {
410  if (*(p+1) == '\0') /* is the `$' the last char in pattern? */
411  return (s == ms->src_end) ? s : NULL; /* check end of string */
412  else goto dflt;
413  }
414  default: dflt: { /* it is a pattern item */
415  const char *ep = classend(ms, p); /* points to what is next */
416  int m = s<ms->src_end && singlematch(uchar(*s), p, ep);
417  switch (*ep) {
418  case '?': { /* optional */
419  const char *res;
420  if (m && ((res=match(ms, s+1, ep+1)) != NULL))
421  return res;
422  p=ep+1; goto init; /* else return match(ms, s, ep+1); */
423  }
424  case '*': { /* 0 or more repetitions */
425  return max_expand(ms, s, p, ep);
426  }
427  case '+': { /* 1 or more repetitions */
428  return (m ? max_expand(ms, s+1, p, ep) : NULL);
429  }
430  case '-': { /* 0 or more repetitions (minimum) */
431  return min_expand(ms, s, p, ep);
432  }
433  default: {
434  if (!m) return NULL;
435  s++; p=ep; goto init; /* else return match(ms, s+1, ep); */
436  }
437  }
438  }
439  }
440 }
static const char* match_capture ( MatchState ms,
const char *  s,
int  l 
)
static

Definiert in Zeile 354 der Datei lstrlib.c.

354  {
355  size_t len;
356  l = check_capture(ms, l);
357  len = ms->capture[l].len;
358  if ((size_t)(ms->src_end-s) >= len &&
359  memcmp(ms->capture[l].init, s, len) == 0)
360  return s+len;
361  else return NULL;
362 }
static int match_class ( int  c,
int  cl 
)
static

Definiert in Zeile 226 der Datei lstrlib.c.

226  {
227  int res;
228  switch (tolower(cl)) {
229  case 'a' : res = isalpha(c); break;
230  case 'c' : res = iscntrl(c); break;
231  case 'd' : res = isdigit(c); break;
232  case 'l' : res = islower(c); break;
233  case 'p' : res = ispunct(c); break;
234  case 's' : res = isspace(c); break;
235  case 'u' : res = isupper(c); break;
236  case 'w' : res = isalnum(c); break;
237  case 'x' : res = isxdigit(c); break;
238  case 'z' : res = (c == 0); break;
239  default: return (cl == c);
240  }
241  return (islower(cl) ? res : !res);
242 }
static const char* matchbalance ( MatchState ms,
const char *  s,
const char *  p 
)
static

Definiert in Zeile 281 der Datei lstrlib.c.

282  {
283  if (*p == 0 || *(p+1) == 0)
284  luaL_error(ms->L, "unbalanced pattern");
285  if (*s != *p) return NULL;
286  else {
287  int b = *p;
288  int e = *(p+1);
289  int cont = 1;
290  while (++s < ms->src_end) {
291  if (*s == e) {
292  if (--cont == 0) return s+1;
293  }
294  else if (*s == b) cont++;
295  }
296  }
297  return NULL; /* string ends out of balance */
298 }
static int matchbracketclass ( int  c,
const char *  p,
const char *  ec 
)
static

Definiert in Zeile 245 der Datei lstrlib.c.

245  {
246  int sig = 1;
247  if (*(p+1) == '^') {
248  sig = 0;
249  p++; /* skip the `^' */
250  }
251  while (++p < ec) {
252  if (*p == L_ESC) {
253  p++;
254  if (match_class(c, uchar(*p)))
255  return sig;
256  }
257  else if ((*(p+1) == '-') && (p+2 < ec)) {
258  p+=2;
259  if (uchar(*(p-2)) <= c && c <= uchar(*p))
260  return sig;
261  }
262  else if (uchar(*p) == c) return sig;
263  }
264  return !sig;
265 }
static const char* max_expand ( MatchState ms,
const char *  s,
const char *  p,
const char *  ep 
)
static

Definiert in Zeile 301 der Datei lstrlib.c.

302  {
303  ptrdiff_t i = 0; /* counts maximum expand for item */
304  while ((s+i)<ms->src_end && singlematch(uchar(*(s+i)), p, ep))
305  i++;
306  /* keeps trying to match with the maximum repetitions */
307  while (i>=0) {
308  const char *res = match(ms, (s+i), ep+1);
309  if (res) return res;
310  i--; /* else didn't match; reduce 1 repetition to try again */
311  }
312  return NULL;
313 }
static const char* min_expand ( MatchState ms,
const char *  s,
const char *  p,
const char *  ep 
)
static

Definiert in Zeile 316 der Datei lstrlib.c.

317  {
318  for (;;) {
319  const char *res = match(ms, s, ep+1);
320  if (res != NULL)
321  return res;
322  else if (s<ms->src_end && singlematch(uchar(*s), p, ep))
323  s++; /* try with one more repetition */
324  else return NULL;
325  }
326 }
static ptrdiff_t posrelat ( ptrdiff_t  pos,
size_t  len 
)
static

Definiert in Zeile 36 der Datei lstrlib.c.

36  {
37  /* relative string position: negative means back from end */
38  if (pos < 0) pos += (ptrdiff_t)len + 1;
39  return (pos >= 0) ? pos : 0;
40 }
static int push_captures ( MatchState ms,
const char *  s,
const char *  e 
)
static

Definiert in Zeile 485 der Datei lstrlib.c.

485  {
486  int i;
487  int nlevels = (ms->level == 0 && s) ? 1 : ms->level;
488  luaL_checkstack(ms->L, nlevels, "too many captures");
489  for (i = 0; i < nlevels; i++)
490  push_onecapture(ms, i, s, e);
491  return nlevels; /* number of strings pushed */
492 }
static void push_onecapture ( MatchState ms,
int  i,
const char *  s,
const char *  e 
)
static

Definiert in Zeile 466 der Datei lstrlib.c.

467  {
468  if (i >= ms->level) {
469  if (i == 0) /* ms->level == 0, too */
470  lua_pushlstring(ms->L, s, e - s); /* add whole match */
471  else
472  luaL_error(ms->L, "invalid capture index");
473  }
474  else {
475  ptrdiff_t l = ms->capture[i].len;
476  if (l == CAP_UNFINISHED) luaL_error(ms->L, "unfinished capture");
477  if (l == CAP_POSITION)
478  lua_pushinteger(ms->L, ms->capture[i].init - ms->src_init + 1);
479  else
480  lua_pushlstring(ms->L, ms->capture[i].init, l);
481  }
482 }
static const char* scanformat ( lua_State L,
const char *  strfrmt,
char *  form 
)
static

Definiert in Zeile 725 der Datei lstrlib.c.

725  {
726  const char *p = strfrmt;
727  while (*p != '\0' && strchr(FLAGS, *p) != NULL) p++; /* skip flags */
728  if ((size_t)(p - strfrmt) >= sizeof(FLAGS))
729  luaL_error(L, "invalid format (repeated flags)");
730  if (isdigit(uchar(*p))) p++; /* skip width */
731  if (isdigit(uchar(*p))) p++; /* (2 digits at most) */
732  if (*p == '.') {
733  p++;
734  if (isdigit(uchar(*p))) p++; /* skip precision */
735  if (isdigit(uchar(*p))) p++; /* (2 digits at most) */
736  }
737  if (isdigit(uchar(*p)))
738  luaL_error(L, "invalid format (width or precision too long)");
739  *(form++) = '%';
740  strncpy(form, strfrmt, p - strfrmt + 1);
741  form += p - strfrmt + 1;
742  *form = '\0';
743  return p;
744 }
static int singlematch ( int  c,
const char *  p,
const char *  ep 
)
static

Definiert in Zeile 268 der Datei lstrlib.c.

268  {
269  switch (*p) {
270  case '.': return 1; /* matches any char */
271  case L_ESC: return match_class(c, uchar(*(p+1)));
272  case '[': return matchbracketclass(c, p, ep-1);
273  default: return (uchar(*p) == c);
274  }
275 }
static const char* start_capture ( MatchState ms,
const char *  s,
const char *  p,
int  what 
)
static

Definiert in Zeile 329 der Datei lstrlib.c.

330  {
331  const char *res;
332  int level = ms->level;
333  if (level >= LUA_MAXCAPTURES) luaL_error(ms->L, "too many captures");
334  ms->capture[level].init = s;
335  ms->capture[level].len = what;
336  ms->level = level+1;
337  if ((res=match(ms, s, p)) == NULL) /* match failed? */
338  ms->level--; /* undo capture */
339  return res;
340 }
static int str_byte ( lua_State L)
static

Definiert in Zeile 106 der Datei lstrlib.c.

106  {
107  size_t l;
108  const char *s = luaL_checklstring(L, 1, &l);
109  ptrdiff_t posi = posrelat(luaL_optinteger(L, 2, 1), l);
110  ptrdiff_t pose = posrelat(luaL_optinteger(L, 3, posi), l);
111  int n, i;
112  if (posi <= 0) posi = 1;
113  if ((size_t)pose > l) pose = l;
114  if (posi > pose) return 0; /* empty interval; return no values */
115  n = (int)(pose - posi + 1);
116  if (posi + n <= pose) /* overflow? */
117  luaL_error(L, "string slice too long");
118  luaL_checkstack(L, n, "string slice too long");
119  for (i=0; i<n; i++)
120  lua_pushinteger(L, uchar(s[posi+i-1]));
121  return n;
122 }
static int str_char ( lua_State L)
static

Definiert in Zeile 125 der Datei lstrlib.c.

125  {
126  int n = lua_gettop(L); /* number of arguments */
127  int i;
128  luaL_Buffer b;
129  luaL_buffinit(L, &b);
130  for (i=1; i<=n; i++) {
131  int c = luaL_checkint(L, i);
132  luaL_argcheck(L, uchar(c) == c, i, "invalid value");
133  luaL_addchar(&b, uchar(c));
134  }
135  luaL_pushresult(&b);
136  return 1;
137 }
static int str_dump ( lua_State L)
static

Definiert in Zeile 147 der Datei lstrlib.c.

147  {
148  luaL_Buffer b;
150  lua_settop(L, 1);
151  luaL_buffinit(L,&b);
152  if (lua_dump(L, writer, &b) != 0)
153  luaL_error(L, "unable to dump given function");
154  luaL_pushresult(&b);
155  return 1;
156 }
static int str_find ( lua_State L)
static

Definiert in Zeile 538 der Datei lstrlib.c.

538  {
539  return str_find_aux(L, 1);
540 }
static int str_find_aux ( lua_State L,
int  find 
)
static

Definiert in Zeile 495 der Datei lstrlib.c.

495  {
496  size_t l1, l2;
497  const char *s = luaL_checklstring(L, 1, &l1);
498  const char *p = luaL_checklstring(L, 2, &l2);
499  ptrdiff_t init = posrelat(luaL_optinteger(L, 3, 1), l1) - 1;
500  if (init < 0) init = 0;
501  else if ((size_t)(init) > l1) init = (ptrdiff_t)l1;
502  if (find && (lua_toboolean(L, 4) || /* explicit request? */
503  strpbrk(p, SPECIALS) == NULL)) { /* or no special characters? */
504  /* do a plain search */
505  const char *s2 = lmemfind(s+init, l1-init, p, l2);
506  if (s2) {
507  lua_pushinteger(L, s2-s+1);
508  lua_pushinteger(L, s2-s+l2);
509  return 2;
510  }
511  }
512  else {
513  MatchState ms;
514  int anchor = (*p == '^') ? (p++, 1) : 0;
515  const char *s1=s+init;
516  ms.L = L;
517  ms.src_init = s;
518  ms.src_end = s+l1;
519  do {
520  const char *res;
521  ms.level = 0;
522  if ((res=match(&ms, s1, p)) != NULL) {
523  if (find) {
524  lua_pushinteger(L, s1-s+1); /* start */
525  lua_pushinteger(L, res-s); /* end */
526  return push_captures(&ms, NULL, 0) + 2;
527  }
528  else
529  return push_captures(&ms, s1, res);
530  }
531  } while (s1++ < ms.src_end && !anchor);
532  }
533  lua_pushnil(L); /* not found */
534  return 1;
535 }
static int str_format ( lua_State L)
static

Definiert in Zeile 756 der Datei lstrlib.c.

756  {
757  int top = lua_gettop(L);
758  int arg = 1;
759  size_t sfl;
760  const char *strfrmt = luaL_checklstring(L, arg, &sfl);
761  const char *strfrmt_end = strfrmt+sfl;
762  luaL_Buffer b;
763  luaL_buffinit(L, &b);
764  while (strfrmt < strfrmt_end) {
765  if (*strfrmt != L_ESC)
766  luaL_addchar(&b, *strfrmt++);
767  else if (*++strfrmt == L_ESC)
768  luaL_addchar(&b, *strfrmt++); /* %% */
769  else { /* format item */
770  char form[MAX_FORMAT]; /* to store the format (`%...') */
771  char buff[MAX_ITEM]; /* to store the formatted item */
772  if (++arg > top)
773  luaL_argerror(L, arg, "no value");
774  strfrmt = scanformat(L, strfrmt, form);
775  switch (*strfrmt++) {
776  case 'c': {
777  sprintf(buff, form, (int)luaL_checknumber(L, arg));
778  break;
779  }
780  case 'd': case 'i': {
781  addintlen(form);
782  sprintf(buff, form, (LUA_INTFRM_T)luaL_checknumber(L, arg));
783  break;
784  }
785  case 'o': case 'u': case 'x': case 'X': {
786  addintlen(form);
787  sprintf(buff, form, (unsigned LUA_INTFRM_T)luaL_checknumber(L, arg));
788  break;
789  }
790  case 'e': case 'E': case 'f':
791  case 'g': case 'G': {
792  sprintf(buff, form, (double)luaL_checknumber(L, arg));
793  break;
794  }
795  case 'q': {
796  addquoted(L, &b, arg);
797  continue; /* skip the 'addsize' at the end */
798  }
799  case 's': {
800  size_t l;
801  const char *s = luaL_checklstring(L, arg, &l);
802  if (!strchr(form, '.') && l >= 100) {
803  /* no precision and string is too long to be formatted;
804  keep original string */
805  lua_pushvalue(L, arg);
806  luaL_addvalue(&b);
807  continue; /* skip the `addsize' at the end */
808  }
809  else {
810  sprintf(buff, form, s);
811  break;
812  }
813  }
814  default: { /* also treat cases `pnLlh' */
815  return luaL_error(L, "invalid option " LUA_QL("%%%c") " to "
816  LUA_QL("format"), *(strfrmt - 1));
817  }
818  }
819  luaL_addlstring(&b, buff, strlen(buff));
820  }
821  }
822  luaL_pushresult(&b);
823  return 1;
824 }
static int str_gsub ( lua_State L)
static

Definiert in Zeile 644 der Datei lstrlib.c.

644  {
645  size_t srcl;
646  const char *src = luaL_checklstring(L, 1, &srcl);
647  const char *p = luaL_checkstring(L, 2);
648  int tr = lua_type(L, 3);
649  int max_s = luaL_optint(L, 4, srcl+1);
650  int anchor = (*p == '^') ? (p++, 1) : 0;
651  int n = 0;
652  MatchState ms;
653  luaL_Buffer b;
654  luaL_argcheck(L, tr == LUA_TNUMBER || tr == LUA_TSTRING ||
655  tr == LUA_TFUNCTION || tr == LUA_TTABLE, 3,
656  "string/function/table expected");
657  luaL_buffinit(L, &b);
658  ms.L = L;
659  ms.src_init = src;
660  ms.src_end = src+srcl;
661  while (n < max_s) {
662  const char *e;
663  ms.level = 0;
664  e = match(&ms, src, p);
665  if (e) {
666  n++;
667  add_value(&ms, &b, src, e);
668  }
669  if (e && e>src) /* non empty match? */
670  src = e; /* skip it */
671  else if (src < ms.src_end)
672  luaL_addchar(&b, *src++);
673  else break;
674  if (anchor) break;
675  }
676  luaL_addlstring(&b, src, ms.src_end-src);
677  luaL_pushresult(&b);
678  lua_pushinteger(L, n); /* number of substitutions */
679  return 2;
680 }
static int str_len ( lua_State L)
static

Definiert in Zeile 28 der Datei lstrlib.c.

28  {
29  size_t l;
30  luaL_checklstring(L, 1, &l);
31  lua_pushinteger(L, l);
32  return 1;
33 }
static int str_lower ( lua_State L)
static

Definiert in Zeile 68 der Datei lstrlib.c.

68  {
69  size_t l;
70  size_t i;
71  luaL_Buffer b;
72  const char *s = luaL_checklstring(L, 1, &l);
73  luaL_buffinit(L, &b);
74  for (i=0; i<l; i++)
75  luaL_addchar(&b, tolower(uchar(s[i])));
76  luaL_pushresult(&b);
77  return 1;
78 }
static int str_match ( lua_State L)
static

Definiert in Zeile 543 der Datei lstrlib.c.

543  {
544  return str_find_aux(L, 0);
545 }
static int str_rep ( lua_State L)
static

Definiert in Zeile 93 der Datei lstrlib.c.

93  {
94  size_t l;
95  luaL_Buffer b;
96  const char *s = luaL_checklstring(L, 1, &l);
97  int n = luaL_checkint(L, 2);
98  luaL_buffinit(L, &b);
99  while (n-- > 0)
100  luaL_addlstring(&b, s, l);
101  luaL_pushresult(&b);
102  return 1;
103 }
static int str_reverse ( lua_State L)
static

Definiert in Zeile 57 der Datei lstrlib.c.

57  {
58  size_t l;
59  luaL_Buffer b;
60  const char *s = luaL_checklstring(L, 1, &l);
61  luaL_buffinit(L, &b);
62  while (l--) luaL_addchar(&b, s[l]);
63  luaL_pushresult(&b);
64  return 1;
65 }
static int str_sub ( lua_State L)
static

Definiert in Zeile 43 der Datei lstrlib.c.

43  {
44  size_t l;
45  const char *s = luaL_checklstring(L, 1, &l);
46  ptrdiff_t start = posrelat(luaL_checkinteger(L, 2), l);
47  ptrdiff_t end = posrelat(luaL_optinteger(L, 3, -1), l);
48  if (start < 1) start = 1;
49  if (end > (ptrdiff_t)l) end = (ptrdiff_t)l;
50  if (start <= end)
51  lua_pushlstring(L, s+start-1, end-start+1);
52  else lua_pushliteral(L, "");
53  return 1;
54 }
static int str_upper ( lua_State L)
static

Definiert in Zeile 81 der Datei lstrlib.c.

81  {
82  size_t l;
83  size_t i;
84  luaL_Buffer b;
85  const char *s = luaL_checklstring(L, 1, &l);
86  luaL_buffinit(L, &b);
87  for (i=0; i<l; i++)
88  luaL_addchar(&b, toupper(uchar(s[i])));
89  luaL_pushresult(&b);
90  return 1;
91 }
static int writer ( lua_State L,
const void *  b,
size_t  size,
void *  B 
)
static

Definiert in Zeile 140 der Datei lstrlib.c.

140  {
141  (void)L;
142  luaL_addlstring((luaL_Buffer*) B, (const char *)b, size);
143  return 0;
144 }

Variablen-Dokumentation

const luaL_Reg strlib[]
static
Initialisierung:
= {
{"byte", str_byte},
{"char", str_char},
{"dump", str_dump},
{"find", str_find},
{"format", str_format},
{"gfind", gfind_nodef},
{"gmatch", gmatch},
{"gsub", str_gsub},
{"len", str_len},
{"lower", str_lower},
{"match", str_match},
{"rep", str_rep},
{"reverse", str_reverse},
{"sub", str_sub},
{"upper", str_upper},
}

Definiert in Zeile 827 der Datei lstrlib.c.