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/* -*- mode: objc; coding: utf-8 -*- */
/* Toilet Lisp, a Common Lisp subset for the Étoilé runtime.
* Copyright (C) 2008 Matthias Andreas Benkard.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or (at
* your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#import "MLKCharacterStream.h"
#import "runtime-compatibility.h"
#import "util.h"
#import <Foundation/NSException.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
@implementation MLKCharacterStream
-(id) init;
{
self = [super init];
_cachedChar = 0;
_charCached = NO;
return self;
}
-(unichar) readChar
{
if (_charCached)
{
char ch;
ch = _cachedChar;
_cachedChar = 0;
_charCached = NO;
return ch;
}
else
{
return [self readCharNoCache];
}
}
-(void) unreadChar:(unichar)ch
{
if (_charCached)
[NSException raise:@"MLKInvalidOperationError"
format:@"Attempted to UNREAD-CHAR twice in a row."];
_charCached = YES;
_cachedChar = ch;
}
-(unichar) peekChar
{
unichar ch = [self readChar];
[self unreadChar:ch];
return ch;
}
-(BOOL) isEOF
{
BOOL eofp = NO;
NS_DURING
{
[self peekChar];
}
NS_HANDLER
{
if ([[localException name] isEqual:@"MLKStreamError"])
eofp = YES;
else
[localException raise];
}
NS_ENDHANDLER;
return eofp;
}
-(void) writeString:(NSString *)string
{
int i;
for (i = 0; i < [string length]; i++)
[self writeChar:[string characterAtIndex:i]];
}
-(void) writeChar:(unichar)ch
{
[NSException raise:@"MLKNotImplementedError" format:@""];
ch = 0;
}
-(unichar) readCharNoCache
{
[NSException raise:@"MLKNotImplementedError" format:@""];
return 0;
}
@end
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