ba8b5c17 |
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 | |