152 lines
2.8 KiB
Plaintext
152 lines
2.8 KiB
Plaintext
/*
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* Some grammar independent code.
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* This file is copied into Lpars.c.
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*/
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# ifndef lint
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static char *rcsid = "$Header$";
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# endif
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# ifdef LL_DEBUG
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# include <stdio.h>
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# endif
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int LLsymb;
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unsigned int LLtcnt[LL_NTERMINALS];
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unsigned int LLscnt[LL_NSETS];
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int LLcsymb, LLsymb;
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static int LLlevel;
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/* In this file are defined: */
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extern LLread();
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extern int LLskip();
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extern int LLnext();
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extern LLscan();
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extern LLerror();
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# ifndef LLNOFIRSTS
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extern int LLfirst();
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# endif
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extern LLnewlevel();
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extern LLoldlevel();
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LLscan(t) {
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/*
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* Check if the next symbol is equal to the parameter
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*/
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if ((LLsymb = LL_LEXI()) <= 0) LLsymb = EOFILE;
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if (LLsymb == t) {
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return;
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}
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/*
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* If we come here, an error has been detected
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*/
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LLerror(t);
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}
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LLread() {
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for (;;) {
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if ((LLsymb = LL_LEXI()) <= 0) LLsymb = EOFILE;
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if ((LLcsymb = LLindex[LLsymb]) >= 0) return;
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LLmessage(0);
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}
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/* NOTREACHED */
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}
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LLerror(t) {
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register int i;
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if ((LLcsymb = LLindex[LLsymb]) < 0) {
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LLmessage(0);
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LLread();
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}
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i = LLindex[t];
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LLtcnt[i]++;
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if (LLskip()) /* nothing */;
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LLtcnt[i]--;
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if (LLsymb != t) LLmessage(t);
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}
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# ifndef LLNOFIRSTS
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LLfirst(x, d) {
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register int i;
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return (i = LLindex[x]) >= 0 &&
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(LLsets[d + (i >> 3)] & (1 << (i & 07)));
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}
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# endif
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LLnext(n) {
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if (LLskip()) /* nothing */;
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if (n <= 0) return (LLsets[(LLcsymb >> 3) - n] & (1 << (LLcsymb & 07)));
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return LLsymb == n;
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}
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LLskip() {
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register int i;
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int retval;
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int LLi, LLb;
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retval = 0;
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for (;;) {
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if (LLtcnt[LLcsymb] != 0) return retval;
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LLi = LLcsymb >> 3;
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LLb = 1 << (LLcsymb & 07);
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for (i = LL_NSETS - 1; i >= 0; i--) {
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if (LLscnt[i] != 0) {
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if (LLsets[LL_SSIZE*i+LLi] & LLb) return retval;
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}
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}
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retval = 1;
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LLmessage(0);
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LLread();
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}
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/* NOTREACHED */
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}
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LLnewlevel(LLsinfo) unsigned int *LLsinfo; {
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register int i;
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if (LLlevel++) {
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LLsinfo[LL_NSETS+LL_NTERMINALS] = (unsigned) LLsymb;
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LLsinfo[LL_NSETS+LL_NTERMINALS+1] = (unsigned) LLcsymb;
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for (i = LL_NTERMINALS - 1; i >= 0; i--) {
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LLsinfo[i] = LLtcnt[i];
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LLtcnt[i] = 0;
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}
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for (i = LL_NSETS - 1; i >= 0; i--) {
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LLsinfo[LL_NTERMINALS+i] = LLscnt[i];
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LLscnt[i] = 0;
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}
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}
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LLtincr(0);
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}
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LLoldlevel(LLsinfo) unsigned int *LLsinfo; {
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register int i;
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LLtdecr(0);
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# ifdef LL_DEBUG
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for (i = 0; i < LL_NTERMINALS; i++) LL_assert(LLtcnt[i] == 0);
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for (i = 0; i < LL_NSETS; i++) LL_assert(LLscnt[i] == 0);
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# endif
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if (--LLlevel) {
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for (i = LL_NSETS - 1; i >= 0; i--) {
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LLscnt[i] = LLsinfo[LL_NTERMINALS+i];
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}
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for (i = LL_NTERMINALS - 1; i >= 0; i--) {
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LLtcnt[i] = LLsinfo[i];
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}
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LLsymb = (int) LLsinfo[LL_NSETS+LL_NTERMINALS];
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LLcsymb = (int) LLsinfo[LL_NSETS+LL_NTERMINALS+1];
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}
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}
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# ifdef LL_DEBUG
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LL_badassertion(asstr,file,line) char *asstr, *file; {
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fprintf(stderr,"Assertion \"%s\" failed %s(%d)\n",asstr,file,line);
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abort();
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}
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# endif
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