87 lines
2 KiB
C
87 lines
2 KiB
C
/*
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* (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
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* See the copyright notice in the ACK home directory, in the file "Copyright".
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*/
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/* keytab.c */
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# include "Lpars.h"
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# include <ctype.h>
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# define NKEYWORDS ((sizeof keytab) / (sizeof *keytab))
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# define MAXKEYLEN 8
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typedef struct {
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int k_token;
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char *k_str;
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} KTAB;
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KTAB keytab[] = {
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{ AFTER, "AFTER" }, { ALLOCATE, "ALLOCATE" },
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{ ALT, "ALT" }, { AND, "AND" },
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{ ANY, "ANY" }, { BYTE, "BYTE" },
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{ CHAN, "CHAN" }, { DEF, "DEF" },
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{ FALSE, "FALSE" }, { FOR, "FOR" },
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{ IF, "IF" }, { LOAD, "LOAD" },
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{ NOT, "NOT" }, { NOW, "NOW" },
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{ OR, "OR" }, { PAR, "PAR" },
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{ PLACED, "PLACED" }, { PORT, "PORT" },
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{ PRI, "PRI" }, { PROC, "PROC" },
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{ SEQ, "SEQ" }, { SKIP, "SKIP" },
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{ TABLE, "TABLE" }, { TRUE, "TRUE" },
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{ VALUE, "VALUE" }, { VAR, "VAR" },
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{ WAIT, "WAIT" }, { WHILE, "WHILE" },
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};
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/*
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* The table of keywords is searched for the occurence of `str',
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* if found the corresponding token number is returned,
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* otherwise IDENTIFIER is the returned token number.
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*/
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keyword(str) char *str;
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{
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register int high= NKEYWORDS-1;
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register int low= 0;
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register int i, cmp;
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char *lowerupper();
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register char *key;
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if ((key=lowerupper(str))==0) return IDENTIFIER;
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do {
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i= (high+low) / 2;
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if ((cmp= strcmp(key, keytab[i].k_str)) == 0) break;
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else if (cmp > 0) low= i+1;
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else high= i-1;
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} while (low <= high);
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return low<=high ? keytab[i].k_token : IDENTIFIER;
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}
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char *lowerupper(str) register char *str;
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{
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static char keyword[MAXKEYLEN+1];
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register char *key=keyword;
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if (islower(*str)) {
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do
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*key++ = toupper(*str++);
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while (key<keyword+MAXKEYLEN && islower(*str));
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} else {
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do
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*key++ = *str++;
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while (key<keyword+MAXKEYLEN && isupper(*str));
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}
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*key=0;
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return *str==0 ? keyword : 0;
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}
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char *keyname(key) register int key;
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{
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register KTAB *kp;
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for (kp= keytab; kp< keytab+NKEYWORDS; kp++)
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if (kp->k_token == key) return kp->k_str;
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return 0;
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}
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