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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 "MLKReadtable.h"
#import "MLKCharacter.h"
#import <Foundation/NSDictionary.h>
#import <Foundation/NSValue.h>
#define CONSTITUENT 0
#define WHITESPACE 1
#define TERMINATING_MACRO 2
#define NONTERMINATING_MACRO 3
#define SINGLE_ESCAPE 4
#define MULTI_ESCAPE 5
enum MLKCharacterTrait
{
ALPHABETIC = 0,
INVALID,
PACKAGE_MARKER,
ALPHA_DIGIT,
EXPONENT_MARKER,
NUMBER_MARKER,
RATIO_MARKER,
DECIMAL_POINT,
MINUS_SIGN,
PLUS_SIGN,
SIGN,
DOT
};
@implementation MLKReadtable
-(MLKReadtable *) initSuper
{
return [super init];
}
-(MLKReadtable *) init
{
self = [super init];
_syntaxTable = [[NSMutableDictionary alloc] init];
_readerMacros = [[NSMutableDictionary alloc] init];
_traits = [[NSMutableDictionary alloc] init];
_case = MLKReadtableCase_UPCASE;
return self;
}
-(MLKReadtable *) copyWithZone:(NSZone *)zone
{
MLKReadtable *copy = [[MLKReadtable allocWithZone:zone] initSuper];
copy->_syntaxTable = [_syntaxTable mutableCopyWithZone:zone];
copy->_readerMacros = [_readerMacros mutableCopyWithZone:zone];
copy->_traits = [_traits mutableCopyWithZone:zone];
copy->_case = _case;
return copy;
}
-(BOOL) isWhitespaceCharacter:(unichar)ch
{
return ([[_syntaxTable objectForKey:[NSNumber numberWithLong:ch]]
isEqual:[NSNumber numberWithShort:WHITESPACE]]);
}
-(BOOL) isMacroCharacter:(unichar)ch;
{
return ([self isNonTerminatingMacroCharacter:ch] ||
[self isTerminatingMacroCharacter:ch]);
}
#define DEFINE_SYNTAX_PREDICATE(SELECTOR, SYNTAX_TYPE) \
-(BOOL) SELECTOR (unichar)ch \
{ \
return ([[_syntaxTable objectForKey:[NSNumber numberWithLong:ch]] \
isEqual:[NSNumber numberWithShort:SYNTAX_TYPE]]); \
}
DEFINE_SYNTAX_PREDICATE(isNonTerminatingMacroCharacter:, NONTERMINATING_MACRO)
DEFINE_SYNTAX_PREDICATE(isTerminatingMacroCharacter:, TERMINATING_MACRO)
DEFINE_SYNTAX_PREDICATE(isSingleEscapeCharacter:, SINGLE_ESCAPE)
DEFINE_SYNTAX_PREDICATE(isMultipleEscapeCharacter:, MULTI_ESCAPE)
DEFINE_SYNTAX_PREDICATE(isConstituentCharacter:, CONSTITUENT)
-(BOOL) characterHasCase:(unichar)ch
{
return (![[[NSString stringWithFormat:@"%C", ch] uppercaseString]
isEqual:[[NSString stringWithFormat:@"%C", ch] lowercaseString]]);
}
-(MLKFuncallable *) macroFunctionForCharacter:(unichar)ch;
{
return [_readerMacros objectForKey:[NSNumber numberWithLong:ch]];
}
-(unichar) charWithReadtableCase:(unichar)ch
{
switch (_case)
{
case MLKReadtableCase_PRESERVE:
return ch;
case MLKReadtableCase_UPCASE:
return [MLKCharacter uppercaseCharForChar:ch];
case MLKReadtableCase_DOWNCASE:
return [MLKCharacter lowercaseCharForChar:ch];
case MLKReadtableCase_INVERT:
{
unichar upCh;
upCh = [MLKCharacter uppercaseCharForChar:ch];
if (ch == upCh)
return [MLKCharacter lowercaseCharForChar:ch];
else
return upCh;
}
}
return 0;
}
#define DEFINE_TRAIT_PREDICATE(SELECTOR, TRAIT) \
-(BOOL) SELECTOR (unichar)ch \
{ \
return ([[_traits objectForKey:[NSNumber numberWithLong:ch]] \
isEqual:[NSNumber numberWithShort:TRAIT]]); \
}
DEFINE_TRAIT_PREDICATE(isInvalid:, INVALID)
DEFINE_TRAIT_PREDICATE(isAlphabetic:, ALPHABETIC)
DEFINE_TRAIT_PREDICATE(isPackageMarker:, PACKAGE_MARKER)
DEFINE_TRAIT_PREDICATE(isAlphaDigit:, ALPHA_DIGIT)
DEFINE_TRAIT_PREDICATE(isExponentMarker:, EXPONENT_MARKER)
DEFINE_TRAIT_PREDICATE(isNumberMarker:, NUMBER_MARKER)
DEFINE_TRAIT_PREDICATE(isRatioMarker:, RATIO_MARKER)
DEFINE_TRAIT_PREDICATE(isDecimalPoint:, DECIMAL_POINT)
DEFINE_TRAIT_PREDICATE(isMinusSign:, MINUS_SIGN)
DEFINE_TRAIT_PREDICATE(isPlusSign:, PLUS_SIGN)
DEFINE_TRAIT_PREDICATE(isSign:, SIGN)
DEFINE_TRAIT_PREDICATE(isDot:, DOT)
-(BOOL) isDecimalDigit:(unichar)ch
{
return [self isDigit:ch inBase:10];
}
-(BOOL) isDigit:(unichar)ch inBase:(int)base
{
if (base < 11)
return (ch < '0' + base);
else
return (ch <= '9'
|| ('A' <= ch && ch < 'A' + base - 10)
|| ('a' <= ch && ch < 'a' + base - 10));
}
-(int) digitWeight:(unichar)ch
{
if ('0' <= ch && ch <= '9')
return (ch - '0');
else if ('A' <= ch && ch <= 'Z')
return (ch - 'A' + 10);
else
return (ch - 'a' + 10);
}
@end
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