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improved userhook handling, This required some changes in the semantics

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of LLnext and LLskip.
This commit is contained in:
ceriel 1987-03-17 22:41:18 +00:00
parent 78303cdc07
commit 451c0d6679
1 changed files with 27 additions and 5 deletions
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32
util/LLgen/lib/rec
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@ -92,13 +92,29 @@ LLfirst(x, d) {
# endif # endif
LLnext(n) { LLnext(n) {
/* returns: 0 if the current symbol is'nt skipped, and it
is'nt a member of "n",
1 if we have a new symbol, but it is'nt a member,
2 if the current symbol is a member,
and 3 if we have a new symbol and it is a member.
So, the low order bit indicates wether we have a new symbol,
and the next bit indicates wether it is a member of "n".
*/
if (LLskip()) /* nothing */; int retval = 0;
if (n <= 0) return (LLsets[(LLcsymb >> 3) - n] & (1 << (LLcsymb & 07)));
return LLsymb == n; if (LLskip()) retval = 1;
if (n <= 0 && LLsets[(LLcsymb >> 3) - n] & (1 << (LLcsymb & 07))) {
retval |= 2;
}
else if (LLsymb == n) retval |= 2;
return retval;
} }
LLskip() { LLskip() {
/* returns 0 if the current symbol is'nt skipped, and
1 if it is, t.i., we have a new symbol
*/
#ifdef LL_USERHOOK #ifdef LL_USERHOOK
return LLdoskip(0); return LLdoskip(0);
} }
@ -112,16 +128,18 @@ LLuserhook(exp)
} }
LLdoskip(exp) { LLdoskip(exp) {
int LLx;
#endif LL_USERHOOK #endif LL_USERHOOK
register int i; register int i;
int retval; int retval;
int LLi, LLb; int LLi, LLb;
retval = 0; retval = 0;
for (;;) {
#ifdef LL_USERHOOK #ifdef LL_USERHOOK
if (LLuserhook(exp)) continue; LLx = LLuserhook(exp);
if (LLx) retval = 1;
#endif LL_USERHOOK #endif LL_USERHOOK
for (;;) {
if (LLtcnt[LLcsymb] != 0) return retval; if (LLtcnt[LLcsymb] != 0) return retval;
LLi = LLcsymb >> 3; LLi = LLcsymb >> 3;
LLb = 1 << (LLcsymb & 07); LLb = 1 << (LLcsymb & 07);
@ -132,6 +150,10 @@ LLdoskip(exp) {
} }
} }
} }
#ifdef LL_USERHOOK
if (LLx) LLx = LLuserhook(exp);
if (LLx) continue;
#endif LL_USERHOOK
LLmessage(0); LLmessage(0);
retval = 1; retval = 1;
LLread(); LLread();