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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 "MLKParenReader.h"
#import "MLKCharacter.h"
#import "MLKCons.h"
#import "MLKDynamicContext.h"
#import "MLKReader.h"
#import "MLKReadtable.h"
#import "MLKPackage.h"
#import "MLKStream.h"
#import "runtime-compatibility.h"
#import <Foundation/NSArray.h>
static unichar slurpWhitespaceAndPeek (MLKStream *stream, MLKReadtable *readtable)
{
unichar ch;
while ([readtable isWhitespaceCharacter:(ch = [stream readChar])]);
[stream unreadChar:ch];
return ch;
}
@implementation MLKParenReader
-(NSArray *) applyToArray:(NSArray *)arguments
{
MLKStream *stream;
unichar ch;
MLKReadtable *readtable;
MLKCons *cons, *tail;
unichar nextChar;
stream = [arguments objectAtIndex:0];
ch = [[arguments objectAtIndex:1] unicharValue];
readtable = [[MLKDynamicContext currentContext]
valueForSymbol:[[MLKPackage findPackage:@"COMMON-LISP"]
intern:@"*READTABLE*"]];
cons = nil;
tail = nil;
while ((nextChar = slurpWhitespaceAndPeek(stream, readtable)) != ')')
{
id item;
id dotMarker = [[NSObject alloc] init];
// FIXME: What to do about dots? Maybe add a new
// singleDotAllowed:(BOOL)dotp argument to readFromStream:...?
item = [MLKReader readFromStream:stream
eofError:YES
eofValue:nil
recursive:YES
preserveWhitespace:NO
singleDotMarker:dotMarker
readingUninternedSymbol:NO];
if (item == dotMarker)
{
id nextItem;
RELEASE (dotMarker);
nextItem = [MLKReader readFromStream:stream
eofError:YES
eofValue:nil
recursive:YES
preserveWhitespace:NO];
[tail setCdr:nextItem];
if ((nextChar = slurpWhitespaceAndPeek (stream, readtable)) == ')')
{
[stream readChar];
return [NSArray arrayWithObject:cons];
}
else
{
[NSException raise:@"MLKReaderError"
format:@"Unexpectedly read a single dot."];
}
}
if (!tail)
{
cons = tail = [MLKCons cons:item with:nil];
}
else
{
[tail setCdr:[MLKCons cons:item with:nil]];
tail = [tail cdr];
}
RELEASE (dotMarker);
}
[stream readChar];
return [NSArray arrayWithObject:(cons ? (id)cons : (id)[NSNull null])];
}
@end
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