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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 "MLKDispatchingMacroCharacterReader.h"
#import "MLKDynamicContext.h"
#import "MLKInteger.h"
#import "MLKReader.h"
#import "MLKReadtable.h"
#import "MLKPackage.h"
#import "MLKStream.h"
#import "runtime-compatibility.h"
#import "util.h"
#import <Foundation/NSValue.h>
@implementation MLKDispatchingMacroCharacterReader
-(id) init
{
self = [super init];
LASSIGN (_readerMacros, [NSMutableDictionary dictionary]);
return self;
}
-(id <MLKFuncallable>) macroFunctionForCharacter:(unichar)ch
{
return [_readerMacros objectForKey:[NSNumber numberWithLong:ch]];
}
-(void) setMacroFunction:(id <MLKFuncallable>)function forCharacter:(unichar)ch
{
[_readerMacros setObject:function
forKey:[NSNumber numberWithLong:ch]];
}
-(NSArray *) applyToArray:(NSArray *)arguments
{
MLKStream *stream;
MLKReadtable *readtable;
MLKPackage *cl;
unichar ch;
id <MLKFuncallable> function;
NSMutableString *prefix;
cl = [MLKPackage findPackage:@"COMMON-LISP"];
stream = [arguments objectAtIndex:0];
readtable = [[MLKDynamicContext currentContext]
valueForSymbol:[cl intern:@"*READTABLE*"]];
prefix = [NSMutableString string];
while ([readtable isDecimalDigit:(ch = [stream readChar])])
[prefix appendFormat:@"%C", ch];
function = [self macroFunctionForCharacter:ch];
if (!function)
[NSException raise:@"MLKSyntaxError"
format:@"There is no such dispatch macro subcharacter as %C.", ch];
return [function applyToArray:
[NSArray arrayWithObjects:
nullify(stream),
[MLKCharacter characterWithUnichar:ch],
([prefix length] > 0
? (id)[MLKInteger integerWithString:prefix
negative:NO
base:10]
: (id)[NSNull null]),
nil]];
}
@end
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