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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 "MLKReader.h"
#import "MLKCharacter.h"
#import "MLKReadtable.h"
#import "MLKEndOfFileError.h"
#import "MLKReaderError.h"
#import "MLKDynamicContext.h"
#import "MLKEnvironment.h"
#import "MLKPackage.h"
#import "MLKClosure.h"
#import <Foundation/NSArray.h>
#import <Foundation/NSString.h>
@implementation MLKReader
+(id) readFromStream:(MLKStream *)stream
eofError:(BOOL)eofError
eofValue:(id)eofValue
recursive:(BOOL)recursive
preserveWhitespace:(BOOL)preserveWhitespace
{
unichar ch;
NSMutableString *token;
MLKReadtable *readtable;
BOOL escaped;
readtable = [[[MLKDynamicContext currentContext] environment]
valueForBinding:[[MLKPackage findPackage:@"COMMON-LISP"]
intern:@"*READTABLE*"]];
start:
if ([stream isEOF])
{
if (eofError)
[[[MLKEndOfFileError alloc] initWithStream:stream] raise];
else
return eofValue;
}
ch = [stream readChar];
if ([readtable isWhitespaceCharacter:ch])
goto start;
if ([readtable isMacroCharacter:ch])
{
NSArray *returnValues;
MLKClosure *macrofun = [readtable macroFunctionForCharacter:ch];
NSArray *args = [NSArray arrayWithObjects:
stream,
[MLKCharacter characterWithUnichar:ch],
nil];
if ([args count] != 2)
{
args = [NSMutableArray arrayWithCapacity:2];
[((NSMutableArray*)args) addObject:stream];
[((NSMutableArray*)args) addObject:[MLKCharacter
characterWithUnichar:ch]];
}
returnValues = [macrofun applyToArray:args];
if ([returnValues count])
return [returnValues objectAtIndex:0];
else
goto start;
}
escaped = NO;
if ([readtable isSingleEscapeCharacter:ch])
{
if ([stream isEOF])
[[[MLKEndOfFileError alloc] initWithStream:stream] raise];
token = [NSMutableString stringWithCapacity:8];
[token appendFormat:@"%C", [stream readChar]];
}
if ([readtable isMultipleEscapeCharacter:ch])
{
token = [NSMutableString stringWithCapacity:8];
escaped = YES;
}
if ([readtable isConstituentCharacter:ch])
{
token = [NSMutableString stringWithCapacity:8];
[token appendFormat:@"%C", [stream readChar]];
}
while (![stream isEOF])
{
ch = [stream readChar];
if ([readtable isConstituentCharacter:ch] ||
[readtable isNonTerminatingMacroCharacter:ch] ||
(escaped && [readtable isWhitespaceCharacter:ch]))
{
if (escaped)
[token appendFormat:@"%C", ch];
else
[token appendFormat:@"%C", [readtable charWithReadtableCase:ch]];
}
else if ([readtable isSingleEscapeCharacter:ch])
{
if ([stream isEOF])
[[[MLKEndOfFileError alloc] initWithStream:stream] raise];
token = [NSMutableString stringWithCapacity:8];
[token appendFormat:@"%C", [stream readChar]];
}
else if ([readtable isMultipleEscapeCharacter:ch])
escaped = !escaped;
else if ([readtable isTerminatingMacroCharacter:ch])
{
[stream unreadChar];
break;
}
else if ([readtable isWhitespaceCharacter:ch])
{
if (preserveWhitespace)
[stream unreadChar];
break;
}
else if ([readtable isInvalidCharacter:ch])
{
[[[MLKReaderError alloc] initWithStream:stream] raise];
}
}
// FIXME: Check the token for invalid syntax.
return token;
}
@end
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