/* ccl - routines for character classes */
/*-
* Copyright (c) 1990 The Regents of the University of California.
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Vern Paxson.
*
* 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.
*
* Redistribution and use in source and binary forms are permitted provided
* that: (1) source distributions retain this entire copyright notice and
* comment, and (2) distributions including binaries display the following
* acknowledgement: ``This product includes software developed by the
* University of California, Berkeley and its contributors'' in the
* documentation or other materials provided with the distribution and in
* all advertising materials mentioning features or use of this software.
* Neither the name of the University nor the names of its contributors may
* be used to endorse or promote products derived from this software without
* specific prior written permission.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
#ifndef lint
static char rcsid[] =
"@(#) $Header: /usr/fsys/odin/a/vern/flex/RCS/ccl.c,v 2.5 90/06/27 23:48:13 vern Exp $ (LBL)";
#endif
#include "flexdef.h"
/* ccladd - add a single character to a ccl
*
* synopsis
* int cclp;
* int ch;
* ccladd( cclp, ch );
*/
void ccladd( cclp, ch )
int cclp;
int 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 += MAX_CCLS_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 );
*/
void 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];
* FILE *file;
* list_character_set( cset );
*
* writes to the given file 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.
*/
void list_character_set( file, cset )
FILE *file;
int cset[];
{
register int i;
char *readable_form();
putc( '[', file );
for ( i = 0; i < csize; ++i )
{
if ( cset[i] )
{
register int start_char = i;
putc( ' ', file );
fputs( readable_form( i ), file );
while ( ++i < csize && cset[i] )
;
if ( i - 1 > start_char )
/* this was a run */
fprintf( file, "-%s", readable_form( i - 1 ) );
putc( ' ', file );
}
}
putc( ']', file );
}
