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/*
* Infix operator stuff -- modified from LML
*/
#include <stdio.h>
#include "hspincl.h"
#ifdef DPH
#include "hsparser-DPH.tab.h"
#else
#include "hsparser.tab.h"
#endif
#include "constants.h"
#include "utils.h"
static short iscope = 1;
static struct infix {
char *iname;
short ilen;
short ifixity;
short iprecedence;
} infixtab[INFIX_SCOPES][MAX_INFIX] =
{
/*
Name Len Fixity Precedence
*/
"$", 1, INFIXR, 0,
":=", 2, INFIX, 1,
"||", 2, INFIXR, 2,
"&&", 2, INFIXR, 3,
"==", 2, INFIX, 4,
"/=", 2, INFIX, 4,
"<", 1, INFIX, 4,
"<=", 2, INFIX, 4,
">", 1, INFIX, 4,
">=", 2, INFIX, 4,
"elem", 4, INFIX, 4,
"notElem", 7, INFIX, 4,
"\\\\", 2, INFIX, 5,
":", 1, INFIXR, 5,
"++", 2, INFIXR, 5,
"+", 1, INFIXL, 6,
"-", 1, INFIXL, 6,
":+", 2, INFIX, 6,
"*", 1, INFIXL, 7,
"/", 1, INFIXL, 7,
"mod", 3, INFIXL, 7,
"div", 3, INFIXL, 7,
"rem", 3, INFIXL, 7,
"quot", 4, INFIXL, 7,
":%", 2, INFIXL, 7, /* possibly wrong; should be omitted? */
"%", 1, INFIXL, 7,
"**", 2, INFIXR, 8,
"^", 1, INFIXR, 8,
"^^", 2, INFIXR, 8,
"!", 1, INFIXL, 9,
"!!", 2, INFIXL, 9,
"//", 2, INFIXL, 9,
".", 1, INFIXR, 9
};
#define NFIX 31 /* The number of predefined operators */
#define ninfix (ninfixtab[iscope])
static int ninfixtab[INFIX_SCOPES] = {NFIX,0}; /* # of predefined operators */
static char infixstr[MAX_ISTR];
static char *infixp = infixstr;
/* An "iscope" is an "infix scope": the scope of infix declarations
(either the main module or an interface) */
void
enteriscope()
{
if(++iscope > INFIX_SCOPES)
{
char errbuf[ERR_BUF_SIZE];
sprintf(errbuf,"Too many infix scopes (> %d)\n",INFIX_SCOPES);
}
ninfix = 0;
}
void
exitiscope()
{
--iscope;
}
void
exposeis()
{
int i;
--iscope;
for (i=0; i < ninfixtab[iscope+1]; ++i)
{
struct infix *ip = infixtab[iscope+1] + i;
makeinfix(install_literal(ip->iname),ip->ifixity,ip->iprecedence);
}
}
static int
ionelookup(name,iscope)
id name;
int iscope;
{
int i;
char *iname = id_to_string(name);
for(i = 0; i < ninfixtab[iscope]; i++)
{
if(strcmp(iname,infixtab[iscope][i].iname)==0)
return(i);
}
return(-1);
}
struct infix *
infixlookup(name)
id name;
{
int i;
for (i=iscope; i >= 0; --i)
{
int n = ionelookup(name,i);
if (n >= 0)
return (infixtab[i]+n);
}
return (NULL);
}
int
nfixes()
{
return ninfix;
}
char *
fixop(n)
int n;
{
return infixtab[iscope][n].iname;
}
char *
fixtype(n)
int n;
{
switch(infixtab[iscope][n].ifixity) {
case INFIXL:
return "infixl";
case INFIXR:
return "infixr";
case INFIX:
return "infix";
default : return 0;
/* Why might it return 0 ?? (WDP 94/11) */
}
}
int
fixity(n)
int n;
{
#ifdef HSP_DEBUG
fprintf(stderr,"fixity of %s (at %d) is %d\n",infixtab[iscope][n].iname,n,infixtab[iscope][n].ifixity);
#endif
return(n < 0? INFIXL: infixtab[iscope][n].ifixity);
}
long int
precedence(n)
int n;
{
#ifdef HSP_DEBUG
fprintf(stderr,"precedence of %s (at %d) is %d\n",infixtab[iscope][n].iname,n,infixtab[iscope][n].iprecedence);
#endif
return(n < 0? 9: infixtab[iscope][n].iprecedence);
}
int
pfixity(ip)
struct infix *ip;
{
#ifdef HSP_DEBUG
fprintf(stderr,"fixity of %s is %d\n",ip->iname,ip->ifixity);
#endif
return(ip == NULL? INFIXL: ip->ifixity);
}
int
pprecedence(ip)
struct infix *ip;
{
#ifdef HSP_DEBUG
fprintf(stderr,"precedence of %s (at %d) is %d\n",ip->iname,ip->iprecedence);
#endif
return(ip == NULL? 9: ip->iprecedence);
}
void
makeinfix(ssi, fixity, precedence)
id ssi;
int fixity, precedence;
{
register int i, l;
char s[1000];
char *ss = id_to_string(ssi);
for(i=0; i < ninfix; ++i)
{
if(strcmp(ss,infixtab[iscope][i].iname)==0)
{
/* Allow duplicate definitions if they are identical */
if(infixtab[iscope][i].ifixity!=fixity ||
infixtab[iscope][i].iprecedence!=precedence )
{
char errbuf[ERR_BUF_SIZE];
sprintf(errbuf,"(%s) already declared to be %s %d\n",
ss,
fixtype(i),
infixtab[iscope][i].iprecedence);
hsperror(errbuf);
}
return;
}
}
strcpy(s, ss);
l = strlen(s);
s[l] = 0;
if (ninfix >= MAX_INFIX || infixp+l+1 >= &infixstr[MAX_ISTR]) {
char errbuf[ERR_BUF_SIZE];
sprintf(errbuf,"Too many Infix identifiers (> %d)",MAX_INFIX);
hsperror(errbuf);
}
#ifdef HSP_DEBUG
fprintf(stderr,"adding %s (was %s), fixity=%d, prec=%d\n",s,ss,fixity,precedence);
#endif
infixtab[iscope][ninfix].iname = infixp;
strcpy(infixp, s);
infixp += l+1;
infixtab[iscope][ninfix].ifixity = fixity;
infixtab[iscope][ninfix].iprecedence = precedence;
infixtab[iscope][ninfix].ilen = l-1;
ninfix++;
}
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