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LUA/src/Lbaselib.c

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/*
** $Id: lbaselib.c,v 1.276 2013/02/21 13:44:53 roberto Exp $
** Basic library
** See Copyright Notice in LUA.h
*/
#include <ctype.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define lbaselib_c
#define LUA_LIB
#include "LUA.h"
#include "Lauxlib.h"
#include "LUAlib.h"
static int LUAB_print (LUA_State *L) {
int n = LUA_gettop(L); /* number of arguments */
int i;
LUA_getglobal(L, "TOSTRING");
for (i=1; i<=n; i++) {
const char *s;
size_t l;
LUA_pushvalue(L, -1); /* function to be called */
LUA_pushvalue(L, i); /* value to print */
LUA_call(L, 1, 1);
s = LUA_tolstring(L, -1, &l); /* get result */
if (s == NULL)
return LUAL_error(L,
LUA_QL("TOSTRING") " must return a string to " LUA_QL("PRINT"));
if (i>1) LUAi_writestring("\t", 1);
LUAi_writestring(s, l);
LUA_pop(L, 1); /* pop result */
}
LUAi_writeline();
return 0;
}
#define SPACECHARS " \f\n\r\t\v"
static int LUAB_tonumber (LUA_State *L) {
if (LUA_isnoneornil(L, 2)) { /* standard conversion */
int isnum;
LUA_Number n = LUA_tonumberx(L, 1, &isnum);
if (isnum) {
LUA_pushnumber(L, n);
return 1;
} /* else not a number; must be something */
LUAL_checkany(L, 1);
}
else {
size_t l;
const char *s = LUAL_checklstring(L, 1, &l);
const char *e = s + l; /* end point for 's' */
int base = LUAL_checkint(L, 2);
int neg = 0;
LUAL_argcheck(L, 2 <= base && base <= 36, 2, "base out of range");
s += strspn(s, SPACECHARS); /* skip initial spaces */
if (*s == '-') { s++; neg = 1; } /* handle signal */
else if (*s == '+') s++;
if (isalnum((unsigned char)*s)) {
LUA_Number n = 0;
do {
int digit = (isdigit((unsigned char)*s)) ? *s - '0'
: toupper((unsigned char)*s) - 'A' + 10;
if (digit >= base) break; /* invalid numeral; force a fail */
n = n * (LUA_Number)base + (LUA_Number)digit;
s++;
} while (isalnum((unsigned char)*s));
s += strspn(s, SPACECHARS); /* skip trailing spaces */
if (s == e) { /* no invalid trailing characters? */
LUA_pushnumber(L, (neg) ? -n : n);
return 1;
} /* else not a number */
} /* else not a number */
}
LUA_pushnil(L); /* not a number */
return 1;
}
static int LUAB_error (LUA_State *L) {
int level = LUAL_optint(L, 2, 1);
LUA_settop(L, 1);
if (LUA_isstring(L, 1) && level > 0) { /* add extra information? */
LUAL_where(L, level);
LUA_pushvalue(L, 1);
LUA_concat(L, 2);
}
return LUA_error(L);
}
static int LUAB_getmetatable (LUA_State *L) {
LUAL_checkany(L, 1);
if (!LUA_getmetatable(L, 1)) {
LUA_pushnil(L);
return 1; /* no metatable */
}
LUAL_getmetafield(L, 1, "__METATABLE");
return 1; /* returns either __metatable field (if present) or metatable */
}
static int LUAB_setmetatable (LUA_State *L) {
int t = LUA_type(L, 2);
LUAL_checktype(L, 1, LUA_TTABLE);
LUAL_argcheck(L, t == LUA_TNIL || t == LUA_TTABLE, 2,
"NIL or TABLE expected");
if (LUAL_getmetafield(L, 1, "__metatable"))
return LUAL_error(L, "cannot change a protected metaTABLE");
LUA_settop(L, 2);
LUA_setmetatable(L, 1);
return 1;
}
static int LUAB_rawequal (LUA_State *L) {
LUAL_checkany(L, 1);
LUAL_checkany(L, 2);
LUA_pushboolean(L, LUA_rawequal(L, 1, 2));
return 1;
}
static int LUAB_rawlen (LUA_State *L) {
int t = LUA_type(L, 1);
LUAL_argcheck(L, t == LUA_TTABLE || t == LUA_TSTRING, 1,
"TABLE or string expected");
LUA_pushinteger(L, LUA_rawlen(L, 1));
return 1;
}
static int LUAB_rawget (LUA_State *L) {
LUAL_checktype(L, 1, LUA_TTABLE);
LUAL_checkany(L, 2);
LUA_settop(L, 2);
LUA_rawget(L, 1);
return 1;
}
static int LUAB_rawset (LUA_State *L) {
LUAL_checktype(L, 1, LUA_TTABLE);
LUAL_checkany(L, 2);
LUAL_checkany(L, 3);
LUA_settop(L, 3);
LUA_rawset(L, 1);
return 1;
}
static int LUAB_collectgarbage (LUA_State *L) {
static const char *const opts[] = {"STOP", "RESTART", "COLLECT",
"COUNT", "STEP", "SETPAUSE", "SETSTEPMUL",
"SETMAJORINC", "ISRUNNING", "GENERATIONAL", "INCREMENTAL", NULL};
static const int optsnum[] = {LUA_GCSTOP, LUA_GCRESTART, LUA_GCCOLLECT,
LUA_GCCOUNT, LUA_GCSTEP, LUA_GCSETPAUSE, LUA_GCSETSTEPMUL,
LUA_GCSETMAJORINC, LUA_GCISRUNNING, LUA_GCGEN, LUA_GCINC};
int o = optsnum[LUAL_checkoption(L, 1, "collect", opts)];
int ex = LUAL_optint(L, 2, 0);
int res = LUA_gc(L, o, ex);
switch (o) {
case LUA_GCCOUNT: {
int b = LUA_gc(L, LUA_GCCOUNTB, 0);
LUA_pushnumber(L, res + ((LUA_Number)b/1024));
LUA_pushinteger(L, b);
return 2;
}
case LUA_GCSTEP: case LUA_GCISRUNNING: {
LUA_pushboolean(L, res);
return 1;
}
default: {
LUA_pushinteger(L, res);
return 1;
}
}
}
static int LUAB_type (LUA_State *L) {
LUAL_checkany(L, 1);
LUA_pushstring(L, LUAL_typename(L, 1));
return 1;
}
static int pairsmeta (LUA_State *L, const char *method, int iszero,
LUA_CFunction iter) {
if (!LUAL_getmetafield(L, 1, method)) { /* no metamethod? */
LUAL_checktype(L, 1, LUA_TTABLE); /* argument must be a table */
LUA_pushcfunction(L, iter); /* will return generator, */
LUA_pushvalue(L, 1); /* state, */
if (iszero) LUA_pushinteger(L, 0); /* and initial value */
else LUA_pushnil(L);
}
else {
LUA_pushvalue(L, 1); /* argument 'self' to metamethod */
LUA_call(L, 1, 3); /* get 3 values from metamethod */
}
return 3;
}
static int LUAB_next (LUA_State *L) {
LUAL_checktype(L, 1, LUA_TTABLE);
LUA_settop(L, 2); /* create a 2nd argument if there isn't one */
if (LUA_next(L, 1))
return 2;
else {
LUA_pushnil(L);
return 1;
}
}
static int LUAB_pairs (LUA_State *L) {
return pairsmeta(L, "__PAIRS", 0, LUAB_next);
}
static int ipairsaux (LUA_State *L) {
int i = LUAL_checkint(L, 2);
LUAL_checktype(L, 1, LUA_TTABLE);
i++; /* next value */
LUA_pushinteger(L, i);
LUA_rawgeti(L, 1, i);
return (LUA_isnil(L, -1)) ? 1 : 2;
}
static int LUAB_ipairs (LUA_State *L) {
return pairsmeta(L, "__IPAIRS", 1, ipairsaux);
}
static int load_aux (LUA_State *L, int status, int envidx) {
if (status == LUA_OK) {
if (envidx != 0) { /* 'env' parameter? */
LUA_pushvalue(L, envidx); /* environment for loaded function */
if (!LUA_setupvalue(L, -2, 1)) /* set it as 1st upvalue */
LUA_pop(L, 1); /* remove 'env' if not used by previous call */
}
return 1;
}
else { /* error (message is on top of the stack) */
LUA_pushnil(L);
LUA_insert(L, -2); /* put before error message */
return 2; /* return nil plus error message */
}
}
static int LUAB_loadfile (LUA_State *L) {
const char *fname = LUAL_optstring(L, 1, NULL);
const char *mode = LUAL_optstring(L, 2, NULL);
int env = (!LUA_isnone(L, 3) ? 3 : 0); /* 'env' index or 0 if no 'env' */
int status = LUAL_loadfilex(L, fname, mode);
return load_aux(L, status, env);
}
/*
** {======================================================
** Generic Read function
** =======================================================
*/
/*
** reserved slot, above all arguments, to hold a copy of the returned
** string to avoid it being collected while parsed. 'load' has four
** optional arguments (chunk, source name, mode, and environment).
*/
#define RESERVEDSLOT 5
/*
** Reader for generic `load' function: `LUA_load' uses the
** stack for internal stuff, so the reader cannot change the
** stack top. Instead, it keeps its resulting string in a
** reserved slot inside the stack.
*/
static const char *generic_reader (LUA_State *L, void *ud, size_t *size) {
(void)(ud); /* not used */
LUAL_checkstack(L, 2, "too many nested functions");
LUA_pushvalue(L, 1); /* get function */
LUA_call(L, 0, 1); /* call it */
if (LUA_isnil(L, -1)) {
LUA_pop(L, 1); /* pop result */
*size = 0;
return NULL;
}
else if (!LUA_isstring(L, -1))
LUAL_error(L, "reader function must return a string");
LUA_replace(L, RESERVEDSLOT); /* save string in reserved slot */
return LUA_tolstring(L, RESERVEDSLOT, size);
}
static int LUAB_load (LUA_State *L) {
int status;
size_t l;
const char *s = LUA_tolstring(L, 1, &l);
const char *mode = LUAL_optstring(L, 3, "bt");
int env = (!LUA_isnone(L, 4) ? 4 : 0); /* 'env' index or 0 if no 'env' */
if (s != NULL) { /* loading a string? */
const char *chunkname = LUAL_optstring(L, 2, s);
status = LUAL_loadbufferx(L, s, l, chunkname, mode);
}
else { /* loading from a reader function */
const char *chunkname = LUAL_optstring(L, 2, "=(LOAD)");
LUAL_checktype(L, 1, LUA_TFUNCTION);
LUA_settop(L, RESERVEDSLOT); /* create reserved slot */
status = LUA_load(L, generic_reader, NULL, chunkname, mode);
}
return load_aux(L, status, env);
}
/* }====================================================== */
static int dofilecont (LUA_State *L) {
return LUA_gettop(L) - 1;
}
static int LUAB_dofile (LUA_State *L) {
const char *fname = LUAL_optstring(L, 1, NULL);
LUA_settop(L, 1);
if (LUAL_loadfile(L, fname) != LUA_OK)
return LUA_error(L);
LUA_callk(L, 0, LUA_MULTRET, 0, dofilecont);
return dofilecont(L);
}
static int LUAB_assert (LUA_State *L) {
if (!LUA_toboolean(L, 1))
return LUAL_error(L, "%s", LUAL_optstring(L, 2, "assertion failed!"));
return LUA_gettop(L);
}
static int LUAB_select (LUA_State *L) {
int n = LUA_gettop(L);
if (LUA_type(L, 1) == LUA_TSTRING && *LUA_tostring(L, 1) == '#') {
LUA_pushinteger(L, n-1);
return 1;
}
else {
int i = LUAL_checkint(L, 1);
if (i < 0) i = n + i;
else if (i > n) i = n;
LUAL_argcheck(L, 1 <= i, 1, "index out of range");
return n - i;
}
}
static int finishpcall (LUA_State *L, int status) {
if (!LUA_checkstack(L, 1)) { /* no space for extra boolean? */
LUA_settop(L, 0); /* create space for return values */
LUA_pushboolean(L, 0);
LUA_pushstring(L, "stack overflow");
return 2; /* return false, msg */
}
LUA_pushboolean(L, status); /* first result (status) */
LUA_replace(L, 1); /* put first result in first slot */
return LUA_gettop(L);
}
static int pcallcont (LUA_State *L) {
int status = LUA_getctx(L, NULL);
return finishpcall(L, (status == LUA_YIELD));
}
static int LUAB_pcall (LUA_State *L) {
int status;
LUAL_checkany(L, 1);
LUA_pushnil(L);
LUA_insert(L, 1); /* create space for status result */
status = LUA_pcallk(L, LUA_gettop(L) - 2, LUA_MULTRET, 0, 0, pcallcont);
return finishpcall(L, (status == LUA_OK));
}
static int LUAB_xpcall (LUA_State *L) {
int status;
int n = LUA_gettop(L);
LUAL_argcheck(L, n >= 2, 2, "value expected");
LUA_pushvalue(L, 1); /* exchange function... */
LUA_copy(L, 2, 1); /* ...and error handler */
LUA_replace(L, 2);
status = LUA_pcallk(L, n - 2, LUA_MULTRET, 1, 0, pcallcont);
return finishpcall(L, (status == LUA_OK));
}
static int LUAB_tostring (LUA_State *L) {
LUAL_checkany(L, 1);
LUAL_tolstring(L, 1, NULL);
return 1;
}
static const LUAL_Reg base_funcs[] = {
{"ASSERT", LUAB_assert},
{"COLLECTGARBAGE", LUAB_collectgarbage},
{"DOFILE", LUAB_dofile},
{"ERROR", LUAB_error},
{"GETMETATABLE", LUAB_getmetatable},
{"IPAIRS", LUAB_ipairs},
{"LOADFILE", LUAB_loadfile},
{"LOAD", LUAB_load},
#if defined(LUA_COMPAT_LOADSTRING)
{"LOADSTRING", LUAB_load},
#endif
{"NEXT", LUAB_next},
{"PAIRS", LUAB_pairs},
{"PCALL", LUAB_pcall},
{"PRINT", LUAB_print},
{"RAWEQUAL", LUAB_rawequal},
{"RAWLEN", LUAB_rawlen},
{"RAWGET", LUAB_rawget},
{"RAWSET", LUAB_rawset},
{"SELECT", LUAB_select},
{"SETMETATABLE", LUAB_setmetatable},
{"TONUMBER", LUAB_tonumber},
{"TOSTRING", LUAB_tostring},
{"TYPE", LUAB_type},
{"XPCALL", LUAB_xpcall},
{NULL, NULL}
};
LUAMOD_API int LUAopen_base (LUA_State *L) {
/* set global _G */
LUA_pushglobaltable(L);
LUA_pushglobaltable(L);
LUA_setfield(L, -2, "_G");
/* open lib into global table */
LUAL_setfuncs(L, base_funcs, 0);
LUA_pushliteral(L, LUA_VERSION);
LUA_setfield(L, -2, "_VERSION"); /* set global _VERSION */
return 1;
}
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