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/* ccl - routines for character classes */
/*
* Copyright (c) 1987, the University of California
*
* The United States Government has rights in this work pursuant to
* contract no. DE-AC03-76SF00098 between the United States Department of
* Energy and the University of California.
*
* This program may be redistributed. Enhancements and derivative works
* may be created provided the new works, if made available to the general
* public, are made available for use by anyone.
*/
#include "flexdef.h"
#ifndef lint
static char rcsid[] =
"@(#) $Header: /cvsroot/flex/flex/ccl.c,v 1.5 1988/05/08 19:51:06 vern Exp $ (LBL)";
#endif
/* ccladd - add a single character to a ccl
*
* synopsis
* int cclp;
* char ch;
* ccladd( cclp, ch );
*/
ccladd( cclp, ch )
int cclp;
char ch;
{
int ind, len, newpos, i;
len = ccllen[cclp];
ind = cclmap[cclp];
/* check to see if the character is already in the ccl */
for ( i = 0; i < len; ++i )
if ( ccltbl[ind + i] == ch )
return;
newpos = ind + len;
if ( newpos >= current_max_ccl_tbl_size )
{
current_max_ccl_tbl_size += MAX_CCL_TBL_SIZE_INCREMENT;
++num_reallocs;
ccltbl = reallocate_character_array( ccltbl, current_max_ccl_tbl_size );
}
ccllen[cclp] = len + 1;
ccltbl[newpos] = ch;
}
/* cclinit - make an empty ccl
*
* synopsis
* int cclinit();
* new_ccl = cclinit();
*/
int cclinit()
{
if ( ++lastccl >= current_maxccls )
{
current_maxccls += MAXCCLS_INCREMENT;
++num_reallocs;
cclmap = reallocate_integer_array( cclmap, current_maxccls );
ccllen = reallocate_integer_array( ccllen, current_maxccls );
cclng = reallocate_integer_array( cclng, current_maxccls );
}
if ( lastccl == 1 )
/* we're making the first ccl */
cclmap[lastccl] = 0;
else
/* the new pointer is just past the end of the last ccl. Since
* the cclmap points to the \first/ character of a ccl, adding the
* length of the ccl to the cclmap pointer will produce a cursor
* to the first free space
*/
cclmap[lastccl] = cclmap[lastccl - 1] + ccllen[lastccl - 1];
ccllen[lastccl] = 0;
cclng[lastccl] = 0; /* ccl's start out life un-negated */
return ( lastccl );
}
/* cclnegate - negate a ccl
*
* synopsis
* int cclp;
* cclnegate( ccl );
*/
cclnegate( cclp )
int cclp;
{
cclng[cclp] = 1;
}
/* list_character_set - list the members of a set of characters in CCL form
*
* synopsis
* int cset[CSIZE + 1];
* list_character_set( cset );
*
* writes to stderr a character-class representation of those characters
* present in the given set. A character is present if it has a non-zero
* value in the set array.
*/
list_character_set( cset )
int cset[];
{
register int i;
char *readable_form();
putc( '[', stderr );
for ( i = 1; i <= CSIZE; ++i )
{
if ( cset[i] )
{
register int start_char = i;
putc( ' ', stderr );
fputs( readable_form( i ), stderr );
while ( ++i <= CSIZE && cset[i] )
;
if ( i - 1 > start_char )
/* this was a run */
fprintf( stderr, "-%s", readable_form( i - 1 ) );
putc( ' ', stderr );
}
}
putc( ']', stderr );
}
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