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comparison lib/lua/lua-5.2.2/lbaselib.c @ 1866:41cc4dd3c122

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Lua 5.2.2 added.
author Nomad
date Wed, 16 Oct 2013 13:34:26 +0200
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1848:3b39b70e8e93 1866:41cc4dd3c122
1 /*
2 ** $Id: lbaselib.c,v 1.276 2013/02/21 13:44:53 roberto Exp $
3 ** Basic library
4 ** See Copyright Notice in lua.h
5 */
6
7
8
9 #include <ctype.h>
10 #include <stdio.h>
11 #include <stdlib.h>
12 #include <string.h>
13
14 #define lbaselib_c
15 #define LUA_LIB
16
17 #include "lua.h"
18
19 #include "lauxlib.h"
20 #include "lualib.h"
21
22
23 static int luaB_print (lua_State *L) {
24 int n = lua_gettop(L); /* number of arguments */
25 int i;
26 lua_getglobal(L, "tostring");
27 for (i=1; i<=n; i++) {
28 const char *s;
29 size_t l;
30 lua_pushvalue(L, -1); /* function to be called */
31 lua_pushvalue(L, i); /* value to print */
32 lua_call(L, 1, 1);
33 s = lua_tolstring(L, -1, &l); /* get result */
34 if (s == NULL)
35 return luaL_error(L,
36 LUA_QL("tostring") " must return a string to " LUA_QL("print"));
37 if (i>1) luai_writestring("\t", 1);
38 luai_writestring(s, l);
39 lua_pop(L, 1); /* pop result */
40 }
41 luai_writeline();
42 return 0;
43 }
44
45
46 #define SPACECHARS " \f\n\r\t\v"
47
48 static int luaB_tonumber (lua_State *L) {
49 if (lua_isnoneornil(L, 2)) { /* standard conversion */
50 int isnum;
51 lua_Number n = lua_tonumberx(L, 1, &isnum);
52 if (isnum) {
53 lua_pushnumber(L, n);
54 return 1;
55 } /* else not a number; must be something */
56 luaL_checkany(L, 1);
57 }
58 else {
59 size_t l;
60 const char *s = luaL_checklstring(L, 1, &l);
61 const char *e = s + l; /* end point for 's' */
62 int base = luaL_checkint(L, 2);
63 int neg = 0;
64 luaL_argcheck(L, 2 <= base && base <= 36, 2, "base out of range");
65 s += strspn(s, SPACECHARS); /* skip initial spaces */
66 if (*s == '-') { s++; neg = 1; } /* handle signal */
67 else if (*s == '+') s++;
68 if (isalnum((unsigned char)*s)) {
69 lua_Number n = 0;
70 do {
71 int digit = (isdigit((unsigned char)*s)) ? *s - '0'
72 : toupper((unsigned char)*s) - 'A' + 10;
73 if (digit >= base) break; /* invalid numeral; force a fail */
74 n = n * (lua_Number)base + (lua_Number)digit;
75 s++;
76 } while (isalnum((unsigned char)*s));
77 s += strspn(s, SPACECHARS); /* skip trailing spaces */
78 if (s == e) { /* no invalid trailing characters? */
79 lua_pushnumber(L, (neg) ? -n : n);
80 return 1;
81 } /* else not a number */
82 } /* else not a number */
83 }
84 lua_pushnil(L); /* not a number */
85 return 1;
86 }
87
88
89 static int luaB_error (lua_State *L) {
90 int level = luaL_optint(L, 2, 1);
91 lua_settop(L, 1);
92 if (lua_isstring(L, 1) && level > 0) { /* add extra information? */
93 luaL_where(L, level);
94 lua_pushvalue(L, 1);
95 lua_concat(L, 2);
96 }
97 return lua_error(L);
98 }
99
100
101 static int luaB_getmetatable (lua_State *L) {
102 luaL_checkany(L, 1);
103 if (!lua_getmetatable(L, 1)) {
104 lua_pushnil(L);
105 return 1; /* no metatable */
106 }
107 luaL_getmetafield(L, 1, "__metatable");
108 return 1; /* returns either __metatable field (if present) or metatable */
109 }
110
111
112 static int luaB_setmetatable (lua_State *L) {
113 int t = lua_type(L, 2);
114 luaL_checktype(L, 1, LUA_TTABLE);
115 luaL_argcheck(L, t == LUA_TNIL || t == LUA_TTABLE, 2,
116 "nil or table expected");
117 if (luaL_getmetafield(L, 1, "__metatable"))
118 return luaL_error(L, "cannot change a protected metatable");
119 lua_settop(L, 2);
120 lua_setmetatable(L, 1);
121 return 1;
122 }
123
124
125 static int luaB_rawequal (lua_State *L) {
126 luaL_checkany(L, 1);
127 luaL_checkany(L, 2);
128 lua_pushboolean(L, lua_rawequal(L, 1, 2));
129 return 1;
130 }
131
132
133 static int luaB_rawlen (lua_State *L) {
134 int t = lua_type(L, 1);
135 luaL_argcheck(L, t == LUA_TTABLE || t == LUA_TSTRING, 1,
136 "table or string expected");
137 lua_pushinteger(L, lua_rawlen(L, 1));
138 return 1;
139 }
140
141
142 static int luaB_rawget (lua_State *L) {
143 luaL_checktype(L, 1, LUA_TTABLE);
144 luaL_checkany(L, 2);
145 lua_settop(L, 2);
146 lua_rawget(L, 1);
147 return 1;
148 }
149
150 static int luaB_rawset (lua_State *L) {
151 luaL_checktype(L, 1, LUA_TTABLE);
152 luaL_checkany(L, 2);
153 luaL_checkany(L, 3);
154 lua_settop(L, 3);
155 lua_rawset(L, 1);
156 return 1;
157 }
158
159
160 static int luaB_collectgarbage (lua_State *L) {
161 static const char *const opts[] = {"stop", "restart", "collect",
162 "count", "step", "setpause", "setstepmul",
163 "setmajorinc", "isrunning", "generational", "incremental", NULL};
164 static const int optsnum[] = {LUA_GCSTOP, LUA_GCRESTART, LUA_GCCOLLECT,
165 LUA_GCCOUNT, LUA_GCSTEP, LUA_GCSETPAUSE, LUA_GCSETSTEPMUL,
166 LUA_GCSETMAJORINC, LUA_GCISRUNNING, LUA_GCGEN, LUA_GCINC};
167 int o = optsnum[luaL_checkoption(L, 1, "collect", opts)];
168 int ex = luaL_optint(L, 2, 0);
169 int res = lua_gc(L, o, ex);
170 switch (o) {
171 case LUA_GCCOUNT: {
172 int b = lua_gc(L, LUA_GCCOUNTB, 0);
173 lua_pushnumber(L, res + ((lua_Number)b/1024));
174 lua_pushinteger(L, b);
175 return 2;
176 }
177 case LUA_GCSTEP: case LUA_GCISRUNNING: {
178 lua_pushboolean(L, res);
179 return 1;
180 }
181 default: {
182 lua_pushinteger(L, res);
183 return 1;
184 }
185 }
186 }
187
188
189 static int luaB_type (lua_State *L) {
190 luaL_checkany(L, 1);
191 lua_pushstring(L, luaL_typename(L, 1));
192 return 1;
193 }
194
195
196 static int pairsmeta (lua_State *L, const char *method, int iszero,
197 lua_CFunction iter) {
198 if (!luaL_getmetafield(L, 1, method)) { /* no metamethod? */
199 luaL_checktype(L, 1, LUA_TTABLE); /* argument must be a table */
200 lua_pushcfunction(L, iter); /* will return generator, */
201 lua_pushvalue(L, 1); /* state, */
202 if (iszero) lua_pushinteger(L, 0); /* and initial value */
203 else lua_pushnil(L);
204 }
205 else {
206 lua_pushvalue(L, 1); /* argument 'self' to metamethod */
207 lua_call(L, 1, 3); /* get 3 values from metamethod */
208 }
209 return 3;
210 }
211
212
213 static int luaB_next (lua_State *L) {
214 luaL_checktype(L, 1, LUA_TTABLE);
215 lua_settop(L, 2); /* create a 2nd argument if there isn't one */
216 if (lua_next(L, 1))
217 return 2;
218 else {
219 lua_pushnil(L);
220 return 1;
221 }
222 }
223
224
225 static int luaB_pairs (lua_State *L) {
226 return pairsmeta(L, "__pairs", 0, luaB_next);
227 }
228
229
230 static int ipairsaux (lua_State *L) {
231 int i = luaL_checkint(L, 2);
232 luaL_checktype(L, 1, LUA_TTABLE);
233 i++; /* next value */
234 lua_pushinteger(L, i);
235 lua_rawgeti(L, 1, i);
236 return (lua_isnil(L, -1)) ? 1 : 2;
237 }
238
239
240 static int luaB_ipairs (lua_State *L) {
241 return pairsmeta(L, "__ipairs", 1, ipairsaux);
242 }
243
244
245 static int load_aux (lua_State *L, int status, int envidx) {
246 if (status == LUA_OK) {
247 if (envidx != 0) { /* 'env' parameter? */
248 lua_pushvalue(L, envidx); /* environment for loaded function */
249 if (!lua_setupvalue(L, -2, 1)) /* set it as 1st upvalue */
250 lua_pop(L, 1); /* remove 'env' if not used by previous call */
251 }
252 return 1;
253 }
254 else { /* error (message is on top of the stack) */
255 lua_pushnil(L);
256 lua_insert(L, -2); /* put before error message */
257 return 2; /* return nil plus error message */
258 }
259 }
260
261
262 static int luaB_loadfile (lua_State *L) {
263 const char *fname = luaL_optstring(L, 1, NULL);
264 const char *mode = luaL_optstring(L, 2, NULL);
265 int env = (!lua_isnone(L, 3) ? 3 : 0); /* 'env' index or 0 if no 'env' */
266 int status = luaL_loadfilex(L, fname, mode);
267 return load_aux(L, status, env);
268 }
269
270
271 /*
272 ** {======================================================
273 ** Generic Read function
274 ** =======================================================
275 */
276
277
278 /*
279 ** reserved slot, above all arguments, to hold a copy of the returned
280 ** string to avoid it being collected while parsed. 'load' has four
281 ** optional arguments (chunk, source name, mode, and environment).
282 */
283 #define RESERVEDSLOT 5
284
285
286 /*
287 ** Reader for generic `load' function: `lua_load' uses the
288 ** stack for internal stuff, so the reader cannot change the
289 ** stack top. Instead, it keeps its resulting string in a
290 ** reserved slot inside the stack.
291 */
292 static const char *generic_reader (lua_State *L, void *ud, size_t *size) {
293 (void)(ud); /* not used */
294 luaL_checkstack(L, 2, "too many nested functions");
295 lua_pushvalue(L, 1); /* get function */
296 lua_call(L, 0, 1); /* call it */
297 if (lua_isnil(L, -1)) {
298 lua_pop(L, 1); /* pop result */
299 *size = 0;
300 return NULL;
301 }
302 else if (!lua_isstring(L, -1))
303 luaL_error(L, "reader function must return a string");
304 lua_replace(L, RESERVEDSLOT); /* save string in reserved slot */
305 return lua_tolstring(L, RESERVEDSLOT, size);
306 }
307
308
309 static int luaB_load (lua_State *L) {
310 int status;
311 size_t l;
312 const char *s = lua_tolstring(L, 1, &l);
313 const char *mode = luaL_optstring(L, 3, "bt");
314 int env = (!lua_isnone(L, 4) ? 4 : 0); /* 'env' index or 0 if no 'env' */
315 if (s != NULL) { /* loading a string? */
316 const char *chunkname = luaL_optstring(L, 2, s);
317 status = luaL_loadbufferx(L, s, l, chunkname, mode);
318 }
319 else { /* loading from a reader function */
320 const char *chunkname = luaL_optstring(L, 2, "=(load)");
321 luaL_checktype(L, 1, LUA_TFUNCTION);
322 lua_settop(L, RESERVEDSLOT); /* create reserved slot */
323 status = lua_load(L, generic_reader, NULL, chunkname, mode);
324 }
325 return load_aux(L, status, env);
326 }
327
328 /* }====================================================== */
329
330
331 static int dofilecont (lua_State *L) {
332 return lua_gettop(L) - 1;
333 }
334
335
336 static int luaB_dofile (lua_State *L) {
337 const char *fname = luaL_optstring(L, 1, NULL);
338 lua_settop(L, 1);
339 if (luaL_loadfile(L, fname) != LUA_OK)
340 return lua_error(L);
341 lua_callk(L, 0, LUA_MULTRET, 0, dofilecont);
342 return dofilecont(L);
343 }
344
345
346 static int luaB_assert (lua_State *L) {
347 if (!lua_toboolean(L, 1))
348 return luaL_error(L, "%s", luaL_optstring(L, 2, "assertion failed!"));
349 return lua_gettop(L);
350 }
351
352
353 static int luaB_select (lua_State *L) {
354 int n = lua_gettop(L);
355 if (lua_type(L, 1) == LUA_TSTRING && *lua_tostring(L, 1) == '#') {
356 lua_pushinteger(L, n-1);
357 return 1;
358 }
359 else {
360 int i = luaL_checkint(L, 1);
361 if (i < 0) i = n + i;
362 else if (i > n) i = n;
363 luaL_argcheck(L, 1 <= i, 1, "index out of range");
364 return n - i;
365 }
366 }
367
368
369 static int finishpcall (lua_State *L, int status) {
370 if (!lua_checkstack(L, 1)) { /* no space for extra boolean? */
371 lua_settop(L, 0); /* create space for return values */
372 lua_pushboolean(L, 0);
373 lua_pushstring(L, "stack overflow");
374 return 2; /* return false, msg */
375 }
376 lua_pushboolean(L, status); /* first result (status) */
377 lua_replace(L, 1); /* put first result in first slot */
378 return lua_gettop(L);
379 }
380
381
382 static int pcallcont (lua_State *L) {
383 int status = lua_getctx(L, NULL);
384 return finishpcall(L, (status == LUA_YIELD));
385 }
386
387
388 static int luaB_pcall (lua_State *L) {
389 int status;
390 luaL_checkany(L, 1);
391 lua_pushnil(L);
392 lua_insert(L, 1); /* create space for status result */
393 status = lua_pcallk(L, lua_gettop(L) - 2, LUA_MULTRET, 0, 0, pcallcont);
394 return finishpcall(L, (status == LUA_OK));
395 }
396
397
398 static int luaB_xpcall (lua_State *L) {
399 int status;
400 int n = lua_gettop(L);
401 luaL_argcheck(L, n >= 2, 2, "value expected");
402 lua_pushvalue(L, 1); /* exchange function... */
403 lua_copy(L, 2, 1); /* ...and error handler */
404 lua_replace(L, 2);
405 status = lua_pcallk(L, n - 2, LUA_MULTRET, 1, 0, pcallcont);
406 return finishpcall(L, (status == LUA_OK));
407 }
408
409
410 static int luaB_tostring (lua_State *L) {
411 luaL_checkany(L, 1);
412 luaL_tolstring(L, 1, NULL);
413 return 1;
414 }
415
416
417 static const luaL_Reg base_funcs[] = {
418 {"assert", luaB_assert},
419 {"collectgarbage", luaB_collectgarbage},
420 {"dofile", luaB_dofile},
421 {"error", luaB_error},
422 {"getmetatable", luaB_getmetatable},
423 {"ipairs", luaB_ipairs},
424 {"loadfile", luaB_loadfile},
425 {"load", luaB_load},
426 #if defined(LUA_COMPAT_LOADSTRING)
427 {"loadstring", luaB_load},
428 #endif
429 {"next", luaB_next},
430 {"pairs", luaB_pairs},
431 {"pcall", luaB_pcall},
432 {"print", luaB_print},
433 {"rawequal", luaB_rawequal},
434 {"rawlen", luaB_rawlen},
435 {"rawget", luaB_rawget},
436 {"rawset", luaB_rawset},
437 {"select", luaB_select},
438 {"setmetatable", luaB_setmetatable},
439 {"tonumber", luaB_tonumber},
440 {"tostring", luaB_tostring},
441 {"type", luaB_type},
442 {"xpcall", luaB_xpcall},
443 {NULL, NULL}
444 };
445
446
447 LUAMOD_API int luaopen_base (lua_State *L) {
448 /* set global _G */
449 lua_pushglobaltable(L);
450 lua_pushglobaltable(L);
451 lua_setfield(L, -2, "_G");
452 /* open lib into global table */
453 luaL_setfuncs(L, base_funcs, 0);
454 lua_pushliteral(L, LUA_VERSION);
455 lua_setfield(L, -2, "_VERSION"); /* set global _VERSION */
456 return 1;
457 }
458