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/* -*- mode: objc; coding: utf-8 -*- */
/* Étoilisp/Mulklisp, 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 "MLKStream.h"
#import "runtime-compatibility.h"
#import <Foundation/NSException.h>
@implementation MLKStream
-(MLKStream *) init;
{
return [self initWithInputStream:nil outputStream:nil];
}
-(MLKStream *) initWithInputStream:(NSInputStream *)input;
{
return [self initWithInputStream:input outputStream:nil];
}
-(MLKStream *) initWithOutputStream:(NSOutputStream *)output;
{
return [self initWithInputStream:nil outputStream:output];
}
-(MLKStream *) initWithInputStream:(NSInputStream *)input
outputStream:(NSOutputStream *)output
{
return [self initWithInputStream:input
outputStream:output
encoding:NSUTF8StringEncoding];
}
-(MLKStream *) initWithInputStream:(NSInputStream *)input
outputStream:(NSOutputStream *)output
encoding:(NSStringEncoding)encoding
{
self = [super init];
ASSIGN (_input, input);
ASSIGN (_output, output);
_encoding = encoding;
_cachedChar = 0;
_charCached = NO;
return self;
}
-(unichar) readChar
{
uint8_t *buffer;
int i;
unichar retval;
if (_charCached)
{
char ch;
ch = _cachedChar;
_cachedChar = 0;
_charCached = NO;
return ch;
}
buffer = NULL;
for (i = 0;; i++)
{
NSString *tmpstr;
ssize_t bytes_read;
if (![_input hasBytesAvailable])
{
[NSException raise:@"MLKStreamError"
format:@"Tried to read beyond end of file."];
}
buffer = realloc (buffer, i+1);
bytes_read = [_input read:(buffer+i) maxLength:1];
// NSLog (@"%d bytes read", bytes_read);
tmpstr = [[NSString alloc] initWithBytesNoCopy:buffer
length:(i+1)
encoding:_encoding
freeWhenDone:NO];
if ([tmpstr length] == 1)
{
retval = [tmpstr characterAtIndex:0];
[tmpstr release];
return retval;
}
}
return -1;
}
-(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
{
NS_DURING
{
[self peekChar];
}
NS_HANDLER
{
if ([[localException name] isEqual:@"MLKStreamError"])
NS_VALUERETURN (YES, BOOL);
else
[localException raise];
}
NS_ENDHANDLER;
return NO;
}
@end
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