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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 "MLKCons.h"
#import "MLKDynamicContext.h"
#import "MLKEnvironment.h"
#import "MLKFuncallable.h"
#import "MLKInterpreter.h"
#import "MLKLexicalContext.h"
#import "MLKLexicalEnvironment.h"
#import "MLKPackage.h"
#import "MLKSymbol.h"
#import "runtime-compatibility.h"
#import <Foundation/NSArray.h>
#import <Foundation/NSNull.h>
#import <Foundation/NSString.h>
static MLKPackage *cl;
static MLKPackage *sys;
static MLKSymbol *IF;
static MLKSymbol *PROGN;
static MLKSymbol *TAGBODY;
static MLKSymbol *GO;
static MLKSymbol *CATCH;
static MLKSymbol *THROW;
static MLKSymbol *LAMBDA;
static MLKSymbol *LET;
static MLKSymbol *APPLY;
static MLKSymbol *FUNCALL;
static MLKSymbol *EVAL;
static MLKSymbol *_DEFMACRO;
@implementation MLKInterpreter
+(void) initialize
{
cl = [MLKPackage findPackage:@"COMMON-LISP"];
sys = [MLKPackage findPackage:@"TOILET-SYSTEM"];
IF = [cl intern:@"IF"];
PROGN = [cl intern:@"PROGN"];
TAGBODY = [cl intern:@"TAGBODY"];
GO = [cl intern:@"GO"];
CATCH = [cl intern:@"CATCH"];
THROW = [cl intern:@"THROW"];
LAMBDA = [cl intern:@"LAMBDA"];
LET = [cl intern:@"LET"];
APPLY = [cl intern:@"APPLY"];
EVAL = [cl intern:@"EVAL"];
_DEFMACRO = [sys intern:@"%DEFMACRO"];
}
+(id) eval:(id)program
inLexicalContext:(MLKLexicalContext *)context
withEnvironment:(MLKLexicalEnvironment *)lexenv
{
MLKDynamicContext *dynamicContext = [MLKDynamicContext currentContext];
if (!program || [program isKindOfClass:[MLKSymbol class]])
{
if ([context variableIsLexical:program])
{
return [lexenv valueForSymbol:program];
}
else
{
return [dynamicContext valueForBinding:program];
}
}
else if (![program isKindOfClass:[MLKCons class]])
{
// Everything that is not a list or a symbol evaluates to itself.
return program;
}
else
{
id car = [program car];
if ([car isKindOfClass:[MLKSymbol class]])
{
if (car == APPLY)
{
MLKCons *rest = [self eval:[[[program cdr] cdr] car]
inLexicalContext:context
withEnvironment:lexenv];
return [[[program cdr] car] applyToArray:(rest
? (id)[rest array]
: (id)[NSArray array])];
}
else if (car == EVAL)
{
return [self eval:[self eval:[program cdr]
inLexicalContext:context
withEnvironment:lexenv]
inLexicalContext:[MLKLexicalContext globalContext]
withEnvironment:[MLKLexicalEnvironment
globalEnvironment]];
}
else if (car == PROGN)
{
id result;
id rest = program;
while ((rest = [rest cdr]))
{
result = [self eval:[rest car]
inLexicalContext:context
withEnvironment:lexenv];
}
return result;
}
else if (car == TAGBODY)
{
//FIXME: ...
}
else
{
if ([context symbolNamesFunction:car])
{
id function = [lexenv functionForSymbol:car];
MLKCons *rest = [program cdr];
NSMutableArray *args = [NSMutableArray array];
while (rest)
{
id result = [self eval:[rest car]
inLexicalContext:context
withEnvironment:lexenv];
[args addObject:(result ? (id)result : (id)[NSNull null])];
rest = [rest cdr];
}
return [function applyToArray:args];
}
else if ([context symbolNamesMacro:car])
{
id macrofun = [context macroForSymbol:car];
id expansion = [macrofun applyToArray:
[NSArray arrayWithObjects:
program, context, nil]];
return [self eval:expansion
inLexicalContext:context
withEnvironment:lexenv];
}
}
}
else if (![car isKindOfClass:[MLKCons class]] && [car car] == LAMBDA)
{
return [self eval:[MLKCons cons:FUNCALL with:program]
inLexicalContext:context
withEnvironment:lexenv];
}
}
}
@end
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