static void forlist (LexState *ls, TString *indexname)
{
/* forlist -> NAME {,NAME} IN explist1 forbody */
FuncState *fs = GetCurrentFuncState( ls );
expdesc e;
int nvars = 0;
int base = fs->freereg;
/* create control variables */
new_localvarliteral(ls, "(for generator)", nvars++);
new_localvarliteral(ls, "(for state)", nvars++);
new_localvarliteral(ls, "(for control)", nvars++);
/* create declared variables */
new_localvar(ls, indexname, nvars++);
while (testnext(ls, ','))
{
new_localvar(ls, str_checkname(ls), nvars++);
}
checknext(ls, TK_IN);
int line = ls->linenumber;
adjust_assign(ls, 3, explist1(ls, &e), &e);
luaK_checkstack(fs, 3); /* extra space to call generator */
forbody(ls, base, line, nvars - 3, 0);
}
static void fornum (LexState *ls, TString *varname, int line)
{
/* fornum -> NAME = exp1,exp1[,exp1] forbody */
FuncState *fs = GetCurrentFuncState( ls );
int base = fs->freereg;
new_localvarliteral(ls, "(for index)", 0);
new_localvarliteral(ls, "(for limit)", 1);
new_localvarliteral(ls, "(for step)", 2);
new_localvar(ls, varname, 3);
checknext(ls, '=');
exp1(ls); /* initial value */
checknext(ls, ',');
exp1(ls); /* limit */
if (testnext(ls, ','))
{
exp1(ls); /* optional step */
}
else
{ /* default step = 1 */
luaK_codeABx(fs, OP_LOADK, fs->freereg, luaK_numberK(fs, 1));
luaK_reserveregs(fs, 1);
}
forbody(ls, base, line, 1, 1);
}
static void forlist (LexState *ls, TString *indexname) {
/* forlist -> NAME {,NAME} IN explist1 DO body */
FuncState *fs = ls->fs;
expdesc e;
int nvars = 0;
int line;
int base = fs->freereg;
new_localvarstr(ls, "(for generator)", nvars++);
new_localvarstr(ls, "(for state)", nvars++);
new_localvar(ls, indexname, nvars++);
while (testnext(ls, ','))
new_localvar(ls, str_checkname(ls), nvars++);
check(ls, TK_IN);
line = ls->linenumber;
adjust_assign(ls, nvars, explist1(ls, &e), &e);
luaK_checkstack(fs, 3); /* extra space to call generator */
luaK_codeAsBx(fs, OP_TFORPREP, base, NO_JUMP);
forbody(ls, base, line, nvars, 0);
}
static void fornum (LexState *ls, TString *varname, int line) {
/* fornum -> NAME = exp1,exp1[,exp1] DO body */
FuncState *fs = ls->fs;
int base = fs->freereg;
new_localvar(ls, varname, 0);
new_localvarstr(ls, "(for limit)", 1);
new_localvarstr(ls, "(for step)", 2);
check(ls, '=');
exp1(ls); /* initial value */
check(ls, ',');
exp1(ls); /* limit */
if (testnext(ls, ','))
exp1(ls); /* optional step */
else { /* default step = 1 */
luaK_codeABx(fs, OP_LOADK, fs->freereg, luaK_numberK(fs, 1));
luaK_reserveregs(fs, 1);
}
luaK_codeABC(fs, OP_SUB, fs->freereg - 3, fs->freereg - 3, fs->freereg - 1);
luaK_jump(fs);
forbody(ls, base, line, 3, 1);
}
