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pg.c
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pg.c
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#include "pg.h"
#include "show.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
static int gmode;
static rule RA[1024];
static int RN=1;
/* states */
static int S[10240]; /* state */
static int R[10240]; /* rule */
static int M[10240]; /* mark */
static int D[10240]; /* deleted */
static int N; /* rowcount */
static int SN; /* states count */
static char *C[10240][32]; /* context=first(C) first(0)=$e */
static int CN[10240];
/* transitions */
static int TS[10240]; /* state */
static char *TT[10240]; /* token */
static int TA[10240]; /* action 0=reduce 1=shift 2=goto */
static int TG[10240]; /* goto state */
static int TR[10240]; /* rule */
static int TM[10240]; /* mark */
static int TD[10240]; /* deleted */
static int TN;
/* goto markers */
static int GN;
static int GTN;
/* strings */
static char* str(char *s) {
static int i,c;
static char *t[256];
for(i=0;i<c;i++) if(!strcmp(s,t[i])) return t[i];
t[c]=strdup(s);
return t[c++];
}
/* nonterminals and terminals */
static char *NT[256],*T[256];
static int NTC,TC;
static int ist(char *s) { int i; for(i=0;i<TC;i++) if(s==T[i]) return 1; return 0; }
static int isnt(char *s) { int i; for(i=0;i<NTC;i++) if(s==NT[i]) return 1; return 0; }
static void addnt(char *s) { if(isnt(s)) return; NT[NTC++]=s; }
static void addt(char *s) { if(isnt(s)) return; if(ist(s)) return; T[TC++]=s; }
/* leaf for eunitr */
static char *LF[256];
static int LFN;
static int conflicts;
static int eunitr;
static int derives(char *a, char *b);
/* compact space */
static void cs(char *s) {
char *p=s,*q=s;
if(!s) return;
while(*q&&isblank(*q)) q++;
while(*q) {
*p++ = isblank(*q) ? ' ' : *q;
if(isblank(*q)) while(isblank(*q)) q++;
else q++;
}
*p=0;
if(p!=s&&isblank(*--p)) *p=0;
}
static char* xfgets(char *s, int n, FILE *f) {
char *r = fgets(s,n,f);
s[strlen(s)-1]=0;
cs(s);
return r;
}
/* production in state */
static int pins(int s, int r, int m, char **c, int cn) {
int i,j;
for(i=0;i<N;i++) {
if(S[i]==s&&R[i]==r&&M[i]==m&&CN[i]==cn) {
for(j=0;j<cn;j++)
if(C[i][j]!=c[j]) break;
if(j==cn) return 1;
}
}
return 0;
}
/* unique first righthand side */
int ufrhs(int s, char **u) {
int i,j,f,c=0;
rule *rp;
for(i=0;i<N;i++) {
if(S[i]!=s) continue;
rp=&RA[R[i]];
for(f=0,j=0;j<c;j++) if(u[j]==rp->rhs[M[i]]) f=1;
if(!f) u[c++]=rp->rhs[M[i]];
}
return c;
}
/* first() */
static char *FK[256];
static char *FV[256][32];
static int FC[256];
static int FN;
static char *F[256];
static int firsti(char *p) {
int i;
for(i=0;i<FN;i++) if(p==FK[i]) return i;
return -1;
}
static int infirst(char *p, char *q) {
int i,j;
i=firsti(p);
for(j=0;j<FC[i];j++) if(q==FV[i][j]) return 1;
return 0;
}
static void firstgen() {
int i,j,k,f=1,n,m,s;
char *p,*q;
for(i=0;i<TC;i++) { FK[FN]=T[i]; FV[FN][FC[FN]++]=T[i]; FN++; }
for(i=0;i<NTC;i++) {
FK[FN]=NT[i];
for(j=0;j<RN;j++) if(NT[i]==RA[j].lhs && !RA[j].rhsi) FV[FN][FC[FN]++]=0;
++FN;
}
while(f) {
f=0;
for(i=0;i<NTC;i++) {
p=NT[i];
for(j=0;j<RN;j++) {
if(p!=RA[j].lhs) continue;
n=firsti(p);
for(k=0;k<RA[j].rhsi;k++) {
q=RA[j].rhs[k];
m=firsti(q);
for(s=0;s<FC[m];s++) if(!infirst(p,FV[m][s])) { FV[n][FC[n]++]=FV[m][s]; f=1; }
if(!infirst(q,0)) break;
}
}
}
}
}
static int first(char **p, int c) {
int i,j,n,k=0,b=0,m;
if(!c) { F[k++]=0; return k; } /* empty */
for(i=0;i<c;i++) {
if(ist(p[i])) { F[k++]=p[i]; return k; }
n=firsti(p[i]);
for(j=0;j<FC[n];j++) {
if(!FV[n][j]) { F[k++]=0; b=1; }
else {
for(m=0;m<k;m++) if(F[m]==FV[n][j]) break;
if(m==k) F[k++]=FV[n][j];
}
}
if(!b) break;
}
return k;
}
void pgprintfirst() {
int i,j;
for(i=0;i<FN;i++) {
if(ist(FK[i])) continue;
if(FK[i]==str("$a")) continue;
printf("first(%s) =",FK[i]);
for(j=0;j<FC[i];j++) printf(" %s",FV[i][j]);
printf("\n");
}
}
/* follow() */
static char *AK[256];
static char *AV[256][32];
static int AC[256];
static int followi(char *p) {
int i;
for(i=0;i<NTC;i++) if(p==AK[i]) return i;
return -1;
}
static int infollow(char *p, char *q) {
int i,j;
i=followi(p);
for(j=0;j<AC[i];j++) if(q==AV[i][j]) return 1;
return 0;
}
static void followgen() {
int i,j,k,n,s,m,f=1;
char *p;
for(i=1;i<NTC;i++) AK[i]=NT[i];
AV[1][0]=str("$e");
AC[1]=1;
for(i=1;i<NTC;i++) {
p=NT[i];
for(j=0;j<RN;j++) {
for(k=0;k<RA[j].rhsi;k++) {
if(p!=RA[j].rhs[k]) continue;
if(k==RA[j].rhsi-1) continue;
/* A > aBb : add first(b) to follow(B) */
n=first(&RA[j].rhs[k+1],RA[j].rhsi-k-1);
m=followi(p);
for(s=0;s<n;s++) if(F[s] && !infollow(p,F[s])) AV[m][AC[m]++]=F[s];
}
}
}
while(f) {
f=0;
for(i=1;i<NTC;i++) {
p=NT[i];
for(j=0;j<RN;j++) {
for(k=0;k<RA[j].rhsi;k++) {
if(p!=RA[j].rhs[k]) continue;
if(k==RA[j].rhsi-1); /* A > aB */
else { /* A > aBb */
n=first(&RA[j].rhs[k+1],RA[j].rhsi-k-1);
for(s=0;s<n;s++) if(!F[s]) break;
if(s==n) continue;
}
/* add follow(A) to follow(B) */
n=followi(RA[j].lhs);
m=followi(p);
for(s=0;s<AC[n];s++)
if(!infollow(p,AV[n][s])) { AV[m][AC[m]++]=AV[n][s]; f=1; }
}
}
}
}
}
void pgprintfollow() {
int i,j;
for(i=1;i<NTC;i++) {
printf("follow(%s) =",AK[i]);
for(j=0;j<AC[i];j++) printf(" %s",AV[i][j]);
printf("\n");
}
printf("\n");
}
static void propagatectx(int s, int r, int m) {
int i,j,k,u=0;
char *n=RA[r].rhs[m];
for(i=0;i<N;i++) {
if(S[i]!=s|R[i]!=r||M[i]!=m) continue;
for(j=i+1;j<N;j++) {
if(S[j]!=s) continue;
if(n==RA[R[j]].lhs) {
for(k=0;k<CN[i];k++) {
for(m=0;m<CN[j];m++) if(C[i][k]==C[j][m]) break;
if(m==CN[j]) { C[j][CN[j]++]=C[i][k]; u=1; }
}
if(u) { propagatectx(s,R[j],0); u=0; }
}
}
}
}
static void add2state0(int s, int r, int m) {
int i;
for(i=0;i<N;i++) if(S[i]==s&&R[i]==r&&M[i]==m) break;
if(i!=N) return;
S[N]=s;
R[N]=r;
M[N++]=m;
}
static void add2state1(int s, int r, int m, char **c, int cn) {
int i=0,j,k,u=0;
for(i=0;i<N;i++) {
if(S[i]!=s||R[i]!=r||M[i]!=m) continue;
for(j=0;j<cn;j++) {
for(k=0;k<CN[i];k++) if(C[i][k]==c[j]) break;
if(k==CN[i]) { C[i][CN[i]++]=c[j]; u=1; }
}
if(u) { propagatectx(s,r,m); u=0; }
return;
}
S[N]=s;
R[N]=r;
M[N]=m;
for(i=0;i<cn;i++) C[N][i]=c[i];
CN[N]=cn;
N++;
}
static void closure0(int s) {
int i,j,k,c;
char *u[128];
rule *rp;
c=ufrhs(s,u);
for(i=0;i<c;i++) {
if(ist(u[i])) continue;
for(j=0;j<RN;j++) {
rp=&RA[j];
if(u[i]!=rp->lhs) continue;
if(pins(s,j,0,0,0)) continue;
add2state0(s,j,0);
if(isnt(rp->rhs[0])) {
for(k=0;k<c;k++) if(u[k]==rp->rhs[0]) break;
if(k==c) u[c++]=rp->rhs[0];
}
}
}
}
static void closure1(int s) {
int i,j,k,c,p,b;
rule *r0,*r1;
char *ctx[32],*n;
int ctn=0;
for(i=0;i<N;i++,ctn=0) {
if(S[i]!=s) continue;
r0=&RA[R[i]];
if(r0->rhsi==M[i]||ist(r0->rhs[M[i]])) continue;
for(j=M[i]+1;j<r0->rhsi;j++) ctx[ctn++]=r0->rhs[j];
for(j=0;j<CN[i];j++) ctx[ctn++]=C[i][j];
n=RA[R[i]].rhs[M[i]];
if((b=M[i]+1!=r0->rhsi)) k=first(ctx,ctn);
for(j=0;j<RN;j++) {
if(RA[j].lhs!=n) continue;
add2state1(s,j,0,b?F:ctx,b?k:ctn);
}
}
}
static void closure(int s) {
if(gmode==LR1||gmode==LALR) closure1(s);
else closure0(s);
}
static char esc[256];
static char* escape(char *s) {
int i,j=0,n;
if(!s) return 0;
n=strlen(s);
for(i=0;i<n;i++) {
if(s[i]=='\n') { esc[j++]='\\'; esc[j++]='n'; }
else esc[j++]=s[i];
}
esc[j]=0;
return esc;
}
static void printmp(int r, int m, char **c, int cn) {
int i,j,k;
char *u[32];
rule *rp=&RA[r];
printf("%s %s",rp->lhs,rp->op);
for(k=0;k<rp->rhsi;k++) {
if(k==m) printf(" .");
printf(" %s",escape(rp->rhs[k]));
}
if(m==rp->rhsi) printf(" .");
if(gmode==LR1||gmode==LALR) {
printf(" ,");
for(i=0;i<cn;i++) printf(" %s",c[i]);
}
}
static void addtrans(int s, char *t, int a, int g, int r, int m) {
int i;
for(i=0;i<TN;i++) {
if(TS[i]!=s||TT[i]!=t) continue;
if(a==0&&TA[i]==0&&TR[i]&&TR[i]!=r) {
printf("warning: reduce/reduce conflict state[%d] token[%s]\n",s,t);
printf(" %d. ",TR[i]); printmp(TR[i],TM[i],C[i],CN[i]); printf("\n");
printf(" %d. ",r); printmp(r,m,C[i],CN[i]); printf("\n");
conflicts++;
return;
}
else if(a==0&&TA[i]==1) {
printf("warning: shift/reduce conflict state[%d] token[%s]\n",s,t);
printf(" %d. ",TR[i]); printmp(TR[i],TM[i],C[i],CN[i]); printf("\n");
printf(" %d. ",r); printmp(r,m,C[i],CN[i]); printf("\n");
conflicts++;
return;
}
else if(a==1&&TA[i]==0) ; /* overwrite default reduce follow() entries */
else if(a==1&&TA[i]==1) return; /* just leave first shift rule. TODO?*/
else ; /* a==2 */
TA[i]=a;
TG[i]=g;
TR[i]=r;
TM[i]=m;
return;
}
for(i=0;i<TN;i++) if(TS[i]==s&&TT[i]==t) return;
TS[TN]=s;
TT[TN]=t;
TA[TN]=a;
TG[TN]=g;
TR[TN]=r;
TM[TN++]=m;
}
static void goto0(int s, char *p) {
int i,j,k,f=0,b,c=0;
char *rs,*nta[128];
rule *rp;
GN=N; /* in case this state is not added */
GTN=TN; /* in case this state is not added */
for(i=0;i<N;i++) {
if(S[i]!=s) continue;
rp=&RA[R[i]];
rs=rp->rhs[M[i]];
if(rp->rhsi==M[i]) { /* default reduce rule */
if(gmode==SLR) {
addtrans(s,rs?rs:str("$e"),0,0,R[i],M[i]);
j=followi(rp->lhs);
if(j!=-1) for(k=0;k<AC[j];k++) addtrans(s,AV[j][k],0,0,R[i],M[i]);
}
else if(gmode==LR0) {
if(!R[i]) addtrans(s,str("$e"),0,0,R[i],M[i]);
else for(j=0;j<TC;j++) addtrans(s,T[j],0,0,R[i],M[i]);
}
continue;
}
else if(p==rs) {
if(pins(SN,R[i],M[i],0,0)) continue;
f=1;
add2state0(SN,R[i],M[i]+1);
if((b=isnt(rs))) {
for(j=0;j<c;j++) if(nta[j]==rs) break;
if(j!=c) continue;
nta[c++]=rs;
}
addtrans(s,rs?rs:str(""),b?2:1,SN,R[i],M[i]);
}
}
if(f) closure(SN);
}
static void goto1(int s, char *p) {
int i,j,k,f=0,b,c=0,m;
char *rs,*nta[128];
rule *rp;
GN=N; /* in case this state is not added */
GTN=TN; /* in case this state is not added */
for(i=0;i<N;i++) {
if(S[i]!=s) continue;
rp=&RA[R[i]];
rs=rp->rhs[M[i]];
if(rp->rhsi==M[i]) { /* default reduce rule */
for(j=0;j<CN[i];j++) /* for any lookahead */
addtrans(s,C[i][j],0,0,R[i],M[i]);
}
else if(p==rs) {
if(pins(SN,R[i],M[i]+1,C[i],CN[i])) continue;
f=1;
add2state1(SN,R[i],M[i]+1,C[i],CN[i]);
if((b=isnt(rs))) {
for(j=0;j<c;j++) if(nta[j]==rs) break;
if(j!=c) continue;
nta[c++]=rs;
}
addtrans(s,rs?rs:str(""),b?2:1,SN,R[i],M[i]);
}
}
if(f) closure(SN);
}
static char* split(char *p, char c, char **q) {
int i,n,s=0;
if(!p) p=*q;
if(!p) return 0;
n=strlen(p);
for(i=0;i<n;i++) {
if(s==0) {
if(p[i]=='<') s=1;
else if(p[i]=='\'') s=2;
else if(p[i]=='"') s=3;
else if(p[i]==c) break;
}
else if(s==1) { if(p[i]=='>') s=0; } /* inside <> */
else if(s==2) { if(p[i]=='\'') s=0; } /* inside '' */
else if(s==3) { if(p[i]=='"') s=0; } /* inside "" */
}
if(i==n) *q=0;
else { *q=p+i; *(*q)++=0; }
return p;
}
/* star plus question cond */
static void spqc(char *q, char *s, char m) {
char *t,*z,*u,*v;
if(!s) return;
t=strdup(s);
u=split(t,' ',&z);
while(u) {
if(1<strlen(u) && u[strlen(u)-1]==m) {
v=strdup(u);
v[strlen(v)-1]=0;
switch(m) {
case '*':
sprintf(RA[RN++].r,"%s %s",u,q);
sprintf(RA[RN++].r,"%s %s %s %s",u,q,u,v);
break;
case '+':
sprintf(RA[RN++].r,"%s %s %s",u,q,v);
sprintf(RA[RN++].r,"%s %s %s %s",u,q,u,v);
break;
case '?':
sprintf(RA[RN++].r,"%s %s",u,q);
sprintf(RA[RN++].r,"%s %s %s",u,q,v);
break;
case ']':
sprintf(RA[RN++].r,"%s %s",u,q);
sprintf(RA[RN++].r,"%s %s %s",u,q,v+1);
break;
}
cs(RA[RN-2].r);
cs(RA[RN-1].r);
free(v);
}
u=split(0,' ',&z);
}
free(t);
}
static char arules[10240];
void pgread(char *g) {
FILE *fp;
char b[1024],p[256],q[256],r[1024],*s,*z;
if(!(fp=fopen(g,"r"))) { fprintf(stderr,"error: file not found\n"); exit(1); }
while(xfgets(b,1024,fp)) {
strcat(arules,b); strcat(arules,"\n");
if(!*b) continue;
if('#'==*b) continue;
split(b,'#',&z);
cs(b);
if('|'==*b) strcpy(r,b+1);
else {
strcpy(p,split(b,' ',&z));
strcpy(q,split(0,' ',&z));
strcpy(r,b+strlen(p)+strlen(q)+2);
}
s=split(r,'|',&z);
while(s) {
snprintf(RA[RN].r,1024,"%s %s %s",p,q,s?s:"");
cs(RA[RN++].r);
spqc(q,s,'*');
spqc(q,s,'+');
spqc(q,s,'?');
spqc(q,s,']');
s=split(0,'|',&z);
}
}
fclose(fp);
}
void pgparse() {
int i;
char *p,b[1024],*z;
addnt(str("$a"));
for(i=1;i<RN;i++) {
strcpy(b,RA[i].r);
p=split(b,' ',&z); if(!p) continue; addnt(str(p));
}
for(i=0;i<RN;i++) {
strcpy(b,RA[i].r);
p=split(b,' ',&z); if(!p) continue; RA[i].lhs=str(p);
p=split(0,' ',&z); if(!p) continue; RA[i].op=str(p);
p=split(0,' ',&z); while(p) {
RA[i].rhs[RA[i].rhsi++]=str(p);
addt(str(p));
p=split(0,' ',&z);
}
}
addt(str("$e"));
RA[0].lhs=str("$a");
RA[0].op=RA[1].op;
RA[0].rhs[RA[0].rhsi++]=RA[1].lhs;
sprintf(RA[0].r,"%s %s %s",RA[0].lhs,RA[0].op,RA[0].rhs[0]);
firstgen();
followgen();
}
void pgreport() {
int i;
printf("n:"); for(i=0;i<NTC;i++) printf(" %s",NT[i]); printf("\n");
printf("t:"); for(i=0;i<TC;i++) printf(" %s",escape(T[i])); printf("\n");
printf("-------------------------\n");
for(i=0;i<RN;i++) printf("%2d. %s\n",i,escape(RA[i].r));
}
/* goto items in states */
static int gins() {
int i,j,k,n,m;
for(i=0;i<SN;i++) {
n=GN;
for(j=0;j<GN;j++) {
if(S[j]!=i) continue;
for(k=GN;k<N;k++) {
if(R[j]==R[k]&&M[j]==M[k]&&CN[j]==CN[k]) {
for(m=0;m<CN[j];m++) {
if(C[j][m]!=C[k][m]) break;
}
if(m==CN[j]) ++n;
}
}
}
if(N!=n) continue;
return i;
}
return -1;
}
/* find the first state that is a combination of the current potential state.
state s0 is a combination of s1 if s0 has an action A for a symbol P iff
s1 has an action A for P and A is not a unit reduction. */
static int getcomb() {
int i,j,k,n;
for(i=0;i<SN;i++) {
n=GTN;
for(j=0;j<GTN;j++) {
if(TS[j]!=i) continue;
for(k=GTN;k<TN;k++) if(TT[j]==TT[k]&&TA[j]==TA[k]&&TR[j]==TR[k]) ++n;
}
if(n==TN) return i;
}
return -1;
}
void pgbuild(int m) {
int i,j,k,c,s;
char *u[128];
gmode=m;
N=SN=1;
if(gmode==LR1||gmode==LALR) { C[0][0]=str("$e"); CN[0]++; }
closure(0);
for(i=0;i<SN;i++) {
c=ufrhs(i,u);
for(j=0;j<c;j++) {
if(gmode==LR1||gmode==LALR) goto1(i,u[j]);
else goto0(i,u[j]);
s=gins();
if(s<0) SN++;
else { N=GN; for(k=0;k<TN;k++) if(TG[k]==SN) TG[k]=s; }
}
}
}
void pgprints(int i) {
int j;
printf("---------- state %d ----------\n",i);
for(j=0;j<N;j++) {
if(S[j]!=i) continue;
if(!D[j]) { printmp(R[j],M[j],C[j],CN[j]); printf("\n"); }
}
}
static int sdeleted(int s) {
int i;
for(i=0;i<N;i++) if(S[i]==s&&!D[i]) break;
return i==N;
}
void pgprint() {
int i;
for(i=0;i<SN;i++) if(!sdeleted(i)) pgprints(i);
}
static void printstd() {
char *c[] = {"state","rule","marker","deleted"};
int t[] = {1,1,1,1};
void *v[] = {S,R,M,D};
char *a = show(4,N,c,t,v,0);
if(a) { printf("%s",a); free(a); }
}
void pgprintst(int d) {
if(d) { printstd(); return; }
char *c[] = {"state","rule","marker"};
int t[] = {1,1,1};
void *v[] = {S,R,M};
char *a = show(3,N,c,t,v,D);
if(a) { printf("%s",a); free(a); }
}
static void printttd() {
char *c[] = {"state","token","action","goto","rule","deleted"};
int t[] = {1,4,1,1,1,1};
void *v[] = {TS,TT,TA,TG,TR,TD};
char *a = show(6,TN,c,t,v,0);
if(a) { printf("%s",a); free(a); }
}
void pgprintt(int d) {
if(d) { printttd(); return; }
char *c[] = {"state","token","action","goto","rule"};
int t[] = {1,4,1,1,1};
void *v[] = {TS,TT,TA,TG,TR};
char *a = show(5,TN,c,t,v,TD);
if(a) { printf("%s",a); free(a); }
}
static char* getaction(int s, char *t, int a) {
int i;
char *r;
for(i=0;i<TN;i++) {
if(TS[i]!=s) continue;
if(TD[i]) continue;
if(a==1 && TA[i]>1) continue;
if(a==2 && TA[i]!=2) continue;
if(TT[i]==t) break;
}
r=malloc(8);
if(i==TN) r[0]=0;
else if(TA[i]==0) {
if(TR[i]) sprintf(r,"r%d",TR[i]);
else if(TA[i]==0 && TG[i]==0) sprintf(r,"r0");
else r[0]=0;
}
else if(TA[i]==1) sprintf(r,"s%d",TG[i]);
else if(TA[i]==2) sprintf(r,"%2d",TG[i]);
return r;
}
void pgprintt2() {
int i,j,k,*s,*t,cn,*d;
char *a,**c;
void **v;
cn=TC+NTC+LFN+1;
for(i=0;i<LFN;i++) if(isnt(LF[i])) --cn;
v=malloc(sizeof(void*)*cn);
t=(int*)malloc(sizeof(int)*cn);
s=(int*)malloc(sizeof(int)*SN);
c=(char**)malloc(sizeof(char*)*cn);
d=(int*)malloc(sizeof(int)*SN);
for(i=0;i<SN;i++) d[i]=sdeleted(i)?1:0;
for(i=0;i<SN;i++) s[i]=i;
t[0]=1; for(i=1;i<cn;i++) t[i]=4;
c[0]="state";
for(j=1,i=0;i<TC;i++) c[j++]=T[i];
for(i=0;i<NTC;i++) c[j++]=NT[i];
for(i=0;i<LFN;i++) if(!isnt(LF[i])) c[j++]=LF[i];
v[0]=s;
i=1;
for(j=0;j<TC;j++,i++) {
v[i]=(char**)malloc(sizeof(char*)*SN);
for(k=0;k<SN;k++) ((char**)v[i])[k]=getaction(k,c[i],1); /* reduce shift */
}
for(j=0;j<NTC;j++,i++) {
v[i]=(char**)malloc(sizeof(char*)*SN);
for(k=0;k<SN;k++) ((char**)v[i])[k]=getaction(k,c[i],2); /* goto */
}
for(j=0;j<LFN;j++) {
if(isnt(LF[j])) continue;
v[i]=(char**)malloc(sizeof(char*)*SN);
for(k=0;k<SN;k++) ((char**)v[i])[k]=getaction(k,c[i],2); /* goto */
i++;
}
a=show(cn,SN,c,t,v,d);
if(a) { printf("\n%s",a); free(a); }
for(i=1;i<cn;i++) {
for(k=0;k<SN;k++) free(((char**)v[i])[k]);
free(v[i]);
}
free(t);
free(s);
free(c);
free(v);
free(d);
}
static char TL[256][256];
static int TLE[256];
void pgh() {
int i,j,k,n=0;
FILE *fp;
char *ta[1024];
if(!(fp=fopen("p.h","w+"))) { fprintf(stderr,"error: failed to create p.h\n"); exit(1); }
fprintf(fp,"#ifndef P_H\n#define P_H\n\n");
for(i=0;i<TC;i++) ta[n++]=T[i];
for(i=0;i<NTC;i++) ta[n++]=NT[i];
for(i=0;i<n;i++) {
k=i;
for(j=0;j<LFN;j++)
if(ta[i]!=str("$a")&&derives(ta[i],LF[j]))
for(k=0;k<n;k++)
if(ta[k]==LF[j]) break;
TLE[k]=i;
sprintf(TL[i],"T%03d",k);
if(k!=i) continue; /* don't define eliminated tokens */
fprintf(fp,"#define T%03d %3d /* %s */\n",k,k,ta[i]);
}
fprintf(fp,"\n");
fprintf(fp,"void pgparse(char *p);\n\n");
fprintf(fp,"#endif /* P_H */\n");
fclose(fp);
}
static void a2c(FILE *fp, char *k, int *v, int n) {
int i;
fprintf(fp,"static int %s[%d]={",k,n);
for(i=0;i<n;i++) fprintf(fp,"%d%s",v[i],i==n-1?"":",");
fprintf(fp,"};\n");
}
void pgc() {
int i,j,k,*t,n,b=0;
FILE *fp;
if(!(fp=fopen("p.c","w+"))) { fprintf(stderr,"error: failed to create p.c\n"); exit(1); }
fprintf(fp,"#include \"p.h\"\n");
fprintf(fp,"#include <stdio.h>\n");
fprintf(fp,"#include <stdlib.h>\n");
fprintf(fp,"#include <ctype.h>\n\n");
fprintf(fp,"/*\n%s*/\n\n",arules);
j=TC+NTC+LFN;
for(k=0;k<LFN;k++) if(isnt(LF[k])) --j;
t=malloc(sizeof(int)*j);
fprintf(fp,"static int SR[%d][%d]={\n",SN,j);
for(i=0;i<SN;i++) {
if(sdeleted(i)) { fprintf(fp,"{0},\n"); continue; }
fprintf(fp,"{");
memset(t,-1,j*sizeof(int));
for(k=0;k<TN;k++) {
if(TD[k]) continue;
if(TS[k]!=i) continue;
if(ist(TT[k])) {
for(n=0;n<TC;n++) if(T[n]==TT[k]) break;
t[TLE[n]]=k;
}
else {
for(n=0;n<NTC;n++) if(NT[n]==TT[k]) break;
t[TLE[TC+n]]=k;
}
}
for(k=0;k<j;k++) fprintf(fp,"%d%s",t[TLE[k]],k==j-1?"":",");
fprintf(fp,"}%s\n",i==SN-1?"":",");
}
fprintf(fp,"};\n\n");
free(t);
a2c(fp,"TA",TA,TN);
a2c(fp,"TG",TG,TN);
a2c(fp,"TR",TR,TN);
fprintf(fp,"\nstatic int RPOP[%d]={",RN);
for(i=0;i<RN;i++) fprintf(fp,"%d%s",RA[i].rhsi,i==RN-1?"":",");
fprintf(fp,"};\n");
fprintf(fp,"static int LEFT[%d]={",RN);
for(i=0;i<RN;i++) {
for(j=0;j<NTC;j++) if(NT[j]==RA[i].lhs) break;
fprintf(fp,"%s%s",TL[j+TC],i==RN-1?"":",");
}
fprintf(fp,"};\n");
fprintf(fp,"\n"
"int *pgta; /* tokens */\n"
"int *pgva; /* values */\n"
"int pgi; /* tv index */\n"
"static int *vv; /* value stack */\n"
"static size_t vi=-1,vm=2; /* value stack index and max */\n\n");
if(eunitr) {
for(i=0;i<RN;i++)
if(RA[i].lhs==str("$a")||RA[i].rhsi!=1)
fprintf(fp,"static void r%03d() { /* %s */\n}\n",i,RA[i].r);
fprintf(fp,"\nstatic void (*R[%d])()={",RN);
for(i=0;i<RN;i++)
if(RA[i].lhs==str("$a")||RA[i].rhsi!=1) fprintf(fp,"%sr%03d",b++?",":"",i);
else fprintf(fp,"%s%d",b++?",":"",0);
} else {
for(i=0;i<RN;i++) fprintf(fp,"static void r%03d() { /* %s */\n}\n",i,RA[i].r);
fprintf(fp,"\nstatic void (*R[%d])()={",RN);
for(i=0;i<RN;i++) fprintf(fp,"%sr%03d",b++?",":"",i);
}
fprintf(fp,"};\n");
fprintf(fp,"\n"
"static void push(int t, int v) {\n"
" static size_t m=256;\n"
" if(!pgta) pgta=(int*)malloc(m*sizeof(int));\n"
" if(!pgva) pgva=(int*)malloc(m*sizeof(int));\n"
" if(pgi==m) {\n"
" m<<=1;\n"
" pgta=(int*)realloc(pgta,m*sizeof(int));\n"
" pgva=(int*)realloc(pgva,m*sizeof(int));\n"
" }\n"
" pgta[pgi]=t;\n"
" pgva[pgi++]=v;\n"
"}\n"
"\n"
"static int lex(char *p) {\n"
" while(1) {\n"
" while(*p==' ') ++p;\n"
" if(!*p) break;\n"
" if(*p=='\\\\'&&*(p+1)=='\\\\') exit(0);\n"
" else if(*p=='\\n') break;\n"
" else { printf(\"lex\\n\"); return 0; }\n"
" }\n"
" return 1;\n"
"}\n"
"\n"
"void pgparse(char *p) {\n"
" int i=0,j,r;\n"
" static int *ss=0,*st=0;\n"
" static size_t sm=2;\n"
" size_t si=0;\n"
" vi=-1; pgi=0;\n"
" lex(p);\n"
" if(pgi==1) return;\n"
" if(!vv) vv=(int*)malloc(vm*sizeof(int));\n"
" if(!ss) ss=(int*)malloc(sm*sizeof(int));\n"
" if(!st) st=(int*)malloc(sm*sizeof(int));\n"
" ss[si]=0;\n"
" while(i<pgi) {\n"
" if(vi==vm-1) { vm<<=1; vv=(int*)realloc(vv,vm*sizeof(int)); }\n"
" if(si==sm-2) {\n"
" sm<<=1;\n"
" ss=(int*)realloc(ss,sm*sizeof(int));\n"
" st=(int*)realloc(st,sm*sizeof(int));\n"
" }\n"
" j=SR[ss[si]][pgta[i]];\n"
" if(j==-1) { printf(\"parse\\n\"); return; }\n"
" if(TA[j]) { /* shift */\n"
" ss[++si]=TG[j];\n"
" st[si]=pgta[i];\n"
" vv[++vi]=pgva[i++];\n"
" } else { /* reduce */\n"
" r=TR[j];\n"
" (*R[r])();\n"
" if(!r) return; /* accept */\n"
" si-=RPOP[r];\n"
" j=SR[ss[si]][LEFT[r]];\n"
" if(j==-1) { printf(\"parse2\\n\"); return; }\n"
" ss[++si]=TG[j];\n"
" st[si]=LEFT[r];\n"
" }\n"
" }\n"
"}\n"
"\n"
"int main() {\n"
" int c;\n"
" size_t i,m=2;\n"
" char *b=malloc(m+2);\n"
" printf(\" \");\n"
" for(i=0;;i=0) {\n"
" while((c=fgetc(stdin))&&c!='\\n') {\n"
" b[i++]=c;\n"
" if(i==m) { m<<=1; b=realloc(b,m+2); }\n"
" }\n"
" b[i++]='\\n'; b[i]=0;\n"
" pgparse(b);\n"
" printf(\" \");\n"
" }\n"
" return 0;\n"
"}\n");
fclose(fp);
}
static int inleaf(char *s) {
int i;
for(i=0;i<LFN;i++) if(s==LF[i]) return 1;
return 0;
}
static void leaf() {
int i,j,b;
for(i=1;i<RN;i++) {
if(RA[i].rhsi==1) {
b=1;
for(j=1;j<RN;j++) if(RA[j].rhsi==1&&RA[j].lhs==RA[i].rhs[0]) b=0;
if(b&&!inleaf(RA[i].rhs[0])) LF[LFN++]=RA[i].rhs[0];
}
}
}
static char *DR[256];
static int DRN;
static int indr(char *s) {
int i;
for(i=0;i<DRN;i++) if(s==DR[i]) return 1;
return 0;
}
static int derives(char *a, char *b) {
int i;
if(a==b) return 1;
if(ist(a)) return 0;
for(i=0;i<RN;i++) {
if(a!=RA[i].lhs) continue;
if(!RA[i].rhsi) continue;
if(b==RA[i].rhs[0]) return 1;
if(a==RA[i].rhs[0]) continue;
if(derives(RA[i].rhs[0],b)) return 1;
}
return 0;
}
static int copytrans(int a, int b) {
int i,j,r=0;
for(i=0;i<TN;i++) {