/*
* syntax
* empty
* syn0
*/
struct command *
syntax(struct wordent *p1, struct wordent *p2, int flags)
{
while (p1 != p2)
if (any(";&\n", p1->word[0]))
p1 = p1->next;
else
return (syn0(p1, p2, flags));
return (0);
}
/*
* syn3
* ( syn0 ) [ < in ] [ > out ]
* word word* [ < in ] [ > out ]
* KEYWORD ( word* ) word* [ < in ] [ > out ]
*
* KEYWORD = (@ exit foreach if set switch test while)
*/
static struct command *
syn3(struct wordent *p1, struct wordent *p2, int flags)
{
struct wordent *p;
struct wordent *lp, *rp;
struct command *t;
int l;
Char **av;
int n, c;
bool specp = 0;
if (p1 != p2) {
p = p1;
again:
switch (srchx(p->word)) {
case T_ELSE:
p = p->next;
if (p != p2)
goto again;
break;
case T_EXIT:
case T_FOREACH:
case T_IF:
case T_LET:
case T_SET:
case T_SWITCH:
case T_WHILE:
specp = 1;
break;
}
}
n = 0;
l = 0;
for (p = p1; p != p2; p = p->next)
switch (p->word[0]) {
case '(':
if (specp)
n++;
l++;
continue;
case ')':
if (specp)
n++;
l--;
continue;
case '>':
case '<':
if (l != 0) {
if (specp)
n++;
continue;
}
if (p->next == p2)
continue;
if (any(RELPAR, p->next->word[0]))
continue;
n--;
continue;
default:
if (!specp && l != 0)
continue;
n++;
continue;
}
if (n < 0)
n = 0;
t = (struct command *) xcalloc(1, sizeof(*t));
av = (Char **) xcalloc((size_t) (n + 1), sizeof(Char **));
t->t_dcom = av;
n = 0;
if (p2->word[0] == ')')
t->t_dflg = F_NOFORK;
lp = 0;
rp = 0;
l = 0;
for (p = p1; p != p2; p = p->next) {
c = p->word[0];
switch (c) {
case '(':
if (l == 0) {
if (lp != 0 && !specp)
seterror(ERR_BADPLP);
lp = p->next;
}
l++;
goto savep;
case ')':
l--;
if (l == 0)
rp = p;
goto savep;
case '>':
if (l != 0)
goto savep;
if (p->word[1] == '>')
t->t_dflg |= F_APPEND;
if (p->next != p2 && eq(p->next->word, STRand)) {
t->t_dflg |= F_STDERR, p = p->next;
if (flags & (POUT | PERR)) {
seterror(ERR_OUTRED);
continue;
}
}
if (p->next != p2 && eq(p->next->word, STRbang))
t->t_dflg |= F_OVERWRITE, p = p->next;
if (p->next == p2) {
seterror(ERR_MISRED);
continue;
}
p = p->next;
if (any(RELPAR, p->word[0])) {
seterror(ERR_MISRED);
continue;
}
if ((flags & POUT) && ((flags & PERR) == 0 || t->t_drit))
seterror(ERR_OUTRED);
else
t->t_drit = Strsave(p->word);
continue;
case '<':
if (l != 0)
goto savep;
if (p->word[1] == '<')
t->t_dflg |= F_READ;
if (p->next == p2) {
seterror(ERR_MISRED);
continue;
}
p = p->next;
if (any(RELPAR, p->word[0])) {
seterror(ERR_MISRED);
continue;
}
if ((flags & PHERE) && (t->t_dflg & F_READ))
seterror(ERR_REDPAR);
else if ((flags & PIN) || t->t_dlef)
seterror(ERR_INRED);
else
t->t_dlef = Strsave(p->word);
continue;
savep:
if (!specp)
continue;
default:
if (l != 0 && !specp)
continue;
if (seterr == 0)
av[n] = Strsave(p->word);
n++;
continue;
}
}
if (lp != 0 && !specp) {
if (n != 0)
seterror(ERR_BADPLPS);
t->t_dtyp = NODE_PAREN;
t->t_dspr = syn0(lp, rp, PHERE);
}
else {
if (n == 0)
seterror(ERR_NULLCOM);
t->t_dtyp = NODE_COMMAND;
}
return (t);
}
