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/* Scheme48 interface to Henry Spencer's regular expression package.
** Copyright (c) 1993, 1994 by Olin Shivers.
*/
#include <stdlib.h>
#include "regexp.h"
#include "cstuff.h"
/* Make sure our exports match up w/the implementation: */
#include "re1.h"
/* Not multi-threaded reentrant. */
static char *regexp_error;
/* Stash error msg in global. */
void regerror(char *msg) {regexp_error = msg;}
/*
** Return NULL normally, error string on error.
** Stash number of bytes needed for compiled regexp into `*len'
*/
char *re_byte_len(const char *re, int *len)
{
int l;
regexp_error = 0;
*len = regcomp_len(re);
return regexp_error;
}
/*
** Return NULL normally, error string on error.
** Compile regexp into string described by `cr'.
*/
char *re_compile(const char *re, scheme_value cr)
{
int len = STRING_LENGTH(cr);
regexp *r = (regexp *) &STRING_REF(cr, 0);
regexp_error = 0;
regcomp_comp(re, r, len);
return regexp_error;
}
/* Return NULL normally, error string on error.
** Stash match info in start_vec and end_vec.
** Returns boolean match/no-match in hit.
*/
char *re_exec(scheme_value cr, const char *string, int start,
scheme_value start_vec, scheme_value end_vec, int *hit)
{
regexp *r = (regexp *) &STRING_REF(cr, 0);
*hit = 0;
if( VECTOR_LENGTH(start_vec) != NSUBEXP ) /* These tests should */
return "Illegal start vector"; /* never trigger. */
if( VECTOR_LENGTH(end_vec) != NSUBEXP )
return "Illegal end vector";
regexp_error = 0;
if( regexec(r, string+start) ) {
int i;
for(i=0; i<NSUBEXP; i++) {
const char *s = r->startp[i];
const char *e = r->endp[i];
VECTOR_REF(start_vec,i) = s ? ENTER_FIXNUM(s - string) : SCHFALSE;
VECTOR_REF(end_vec,i) = e ? ENTER_FIXNUM(e - string) : SCHFALSE;
r->startp[i] = 0; /* Why did Sommerfeld */
r->endp[i] = 0; /* put these here? */
}
*hit = 1;
}
return regexp_error;
}
char *re_subst(scheme_value cr, const char *match,
const char *src, int start,
scheme_value start_vec, scheme_value end_vec,
scheme_value outbuf, int *len)
{
int i;
regexp *r = (regexp *) &STRING_REF(cr, 0);
if( VECTOR_LENGTH(start_vec) != NSUBEXP ) /* These tests should */
return "Illegal start vector"; /* never trigger. */
if( VECTOR_LENGTH(end_vec) != NSUBEXP )
return "Illegal end vector";
for (i=0; i<NSUBEXP; i++) {
scheme_value se = VECTOR_REF(start_vec, i);
scheme_value ee = VECTOR_REF(end_vec, i);
r->startp[i] = FIXNUMP(se) ? (match + EXTRACT_FIXNUM(se)) : 0;
r->endp[i] = FIXNUMP(ee) ? (match + EXTRACT_FIXNUM(ee)) : 0;
}
regexp_error = 0;
regnsub(r, src, &STRING_REF(outbuf, 0), STRING_LENGTH(outbuf));
*len = strlen(&STRING_REF(outbuf, 0));
return regexp_error;
}
char *re_subst_len(scheme_value cr, const char *match,
const char *src, int start,
scheme_value start_vec, scheme_value end_vec,
int *len)
{
int i;
regexp *r = (regexp *) &STRING_REF(cr, 0);
if( VECTOR_LENGTH(start_vec) != NSUBEXP ) /* These tests should */
return "Illegal start vector"; /* never trigger. */
if( VECTOR_LENGTH(end_vec) != NSUBEXP )
return "Illegal end vector";
for (i=0; i<NSUBEXP; i++) {
scheme_value se = VECTOR_REF(start_vec, i);
scheme_value ee = VECTOR_REF(end_vec, i);
r->startp[i] = FIXNUMP(se) ? (match + EXTRACT_FIXNUM(se)) : 0;
r->endp[i] = FIXNUMP(ee) ? (match + EXTRACT_FIXNUM(ee)) : 0;
}
regexp_error = 0;
*len = regsublen(r, src);
return regexp_error;
}
/* Return NULL normally, error string on error.
** Stash match info in start_vec and end_vec.
** Returns boolean match/no-match in hit.
*/
char *re_match(const char *re, const char *string, int start,
scheme_value start_vec, scheme_value end_vec, int *hit)
{
regexp *prog;
regexp_error = 0;
*hit = 0;
prog = regcomp(re);
if( !prog ) return regexp_error;
if( VECTOR_LENGTH(start_vec) != NSUBEXP ) { /* These two tests */
Free(prog);
return "Illegal start vector";
}
if( VECTOR_LENGTH(end_vec) != NSUBEXP ) { /* should never trigger. */
Free(prog);
return "Illegal end vector";
}
if( regexec(prog, string+start) ) {
int i;
for(i=0; i<NSUBEXP; i++) {
const char *s = prog->startp[i];
const char *e = prog->endp[i];
VECTOR_REF(start_vec,i) = s ? ENTER_FIXNUM(s - string) : SCHFALSE;
VECTOR_REF(end_vec,i) = e ? ENTER_FIXNUM(e - string) : SCHFALSE;
}
*hit = 1;
}
Free(prog);
return regexp_error;
}
char *filter_stringvec(const char *re, char const **stringvec, int *nummatch)
{
regexp *prog;
regexp_error = 0;
if( prog=regcomp(re) ) {
char const **p = stringvec;
char const **q = p;
while(*p) {
if( regexec(prog, *p) ) *q++ = *p;
p++;
}
Free(prog);
*nummatch = q-stringvec;
}
return regexp_error;
}
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