83 lines
1.9 KiB
C
83 lines
1.9 KiB
C
|
/* keytab.c */
|
||
|
|
# include "Lpars.h"
|
||
|
|
# include <ctype.h>
|
||
|
|
|
||
|
|
# define NKEYWORDS ((sizeof keytab) / (sizeof *keytab))
|
||
|
|
# define MAXKEYLEN 8
|
||
|
|
|
||
|
|
typedef struct {
|
||
|
|
int k_token;
|
||
|
|
char *k_str;
|
||
|
|
} KTAB;
|
||
|
|
|
||
|
|
KTAB keytab[] = {
|
||
|
|
{ AFTER, "AFTER" }, { ALLOCATE, "ALLOCATE" },
|
||
|
|
{ ALT, "ALT" }, { AND, "AND" },
|
||
|
|
{ ANY, "ANY" }, { BYTE, "BYTE" },
|
||
|
|
{ CHAN, "CHAN" }, { DEF, "DEF" },
|
||
|
|
{ FALSE, "FALSE" }, { FOR, "FOR" },
|
||
|
|
{ IF, "IF" }, { LOAD, "LOAD" },
|
||
|
|
{ NOT, "NOT" }, { NOW, "NOW" },
|
||
|
|
{ OR, "OR" }, { PAR, "PAR" },
|
||
|
|
{ PLACED, "PLACED" }, { PORT, "PORT" },
|
||
|
|
{ PRI, "PRI" }, { PROC, "PROC" },
|
||
|
|
{ SEQ, "SEQ" }, { SKIP, "SKIP" },
|
||
|
|
{ TABLE, "TABLE" }, { TRUE, "TRUE" },
|
||
|
|
{ VALUE, "VALUE" }, { VAR, "VAR" },
|
||
|
|
{ WAIT, "WAIT" }, { WHILE, "WHILE" },
|
||
|
|
};
|
||
|
|
|
||
|
|
/*
|
||
|
|
* The table of keywords is searched for the occurence of `str',
|
||
|
|
* if found the corresponding token number is returned,
|
||
|
|
* otherwise IDENTIFIER is the returned token number.
|
||
|
|
*/
|
||
|
|
keyword(str) char *str;
|
||
|
|
{
|
||
|
|
register int high= NKEYWORDS-1;
|
||
|
|
register int low= 0;
|
||
|
|
register int i, cmp;
|
||
|
|
char *lowerupper();
|
||
|
|
register char *key;
|
||
|
|
|
||
|
|
if ((key=lowerupper(str))==0) return IDENTIFIER;
|
||
|
|
|
||
|
|
do {
|
||
|
|
i= (high+low) / 2;
|
||
|
|
if ((cmp= strcmp(key, keytab[i].k_str)) == 0) break;
|
||
|
|
else if (cmp > 0) low= i+1;
|
||
|
|
else high= i-1;
|
||
|
|
} while (low <= high);
|
||
|
|
|
||
|
|
return low<=high ? keytab[i].k_token : IDENTIFIER;
|
||
|
|
}
|
||
|
|
|
||
|
|
char *lowerupper(str) register char *str;
|
||
|
|
{
|
||
|
|
static char keyword[MAXKEYLEN+1];
|
||
|
|
register char *key=keyword;
|
||
|
|
|
||
|
|
if (islower(*str)) {
|
||
|
|
do
|
||
|
|
*key++ = toupper(*str++);
|
||
|
|
while (key<keyword+MAXKEYLEN && islower(*str));
|
||
|
|
} else {
|
||
|
|
do
|
||
|
|
*key++ = *str++;
|
||
|
|
while (key<keyword+MAXKEYLEN && isupper(*str));
|
||
|
|
}
|
||
|
|
*key=0;
|
||
|
|
|
||
|
|
return *str==0 ? keyword : 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
char *keyname(key) register int key;
|
||
|
|
{
|
||
|
|
register KTAB *kp;
|
||
|
|
|
||
|
|
for (kp= keytab; kp< keytab+NKEYWORDS; kp++)
|
||
|
|
if (kp->k_token == key) return kp->k_str;
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|