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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 <Foundation/NSArray.h>
#import <Foundation/NSDictionary.h>
#import <Foundation/NSException.h>
#import <Foundation/NSNull.h>
#import <Foundation/NSSet.h>
#import <Foundation/NSString.h>
#import "MLKCons.h"
#import "MLKDynamicContext.h"
#import "MLKLexicalContext.h"
#import "MLKLexicalEnvironment.h"
#import "MLKEnvironment.h"
#import "MLKLinkedList.h"
#import "MLKPackage.h"
#import "MLKParenReader.h"
#import "MLKReadtable.h"
#import "MLKSymbol.h"
#import "MLKInteger.h"
#import "runtime-compatibility.h"
#define MAKE_ENVIRONMENT(variable, parent, parent_member) \
(variable \
? (id) [[MLKEnvironment alloc] \
initWithParent:(parent \
? (id) parent_member \
: nil) \
bindings:variable] \
: (id) (parent ? (id) RETAIN (parent_member) : nil));
static MLKLexicalContext *global_context;
static MLKPackage *cl;
static MLKPackage *sys;
static MLKSymbol *SPECIAL;
static MLKSymbol *LEXICAL;
@implementation MLKLexicalContext
+(void) initialize
{
MLKDynamicContext *dynamic_context = [MLKDynamicContext globalContext];
MLKLexicalEnvironment *globalenv = [MLKLexicalEnvironment globalEnvironment];
cl = [MLKPackage findPackage:@"COMMON-LISP"];
sys = [MLKPackage findPackage:@"TOILET-SYSTEM"];
global_context = [[self alloc] initWithParent:nil
variables:[globalenv variables]
functions:[globalenv functions]
goTags:nil
macros:nil
symbolMacros:nil
declarations:nil];
SPECIAL = [cl intern:@"SPECIAL"];
LEXICAL = [sys intern:@"LEXICAL"];
}
-(MLKLexicalContext *) initWithParent:(MLKLexicalContext *)aContext
variables:(NSSet *)vars
functions:(NSSet *)functions
goTags:(NSDictionary *)goTags
macros:(NSDictionary *)macros
symbolMacros:(NSDictionary *)symbolMacros
declarations:(id)declarations
{
int i;
NSArray *e;
self = [super init];
ASSIGN (_parent, (aContext ? aContext : [MLKLexicalContext globalContext]));
ASSIGN (_variableLocations, [NSMutableDictionary dictionary]);
e = [vars allObjects];
for (i = 0; i < [e count]; i++)
{
[self addVariable:[e objectAtIndex:i]];
}
ASSIGN (_functionLocations, [NSMutableDictionary dictionary]);
e = [functions allObjects];
for (i = 0; i < [e count]; i++)
{
[self addFunction:[e objectAtIndex:i]];
}
_goTags = MAKE_ENVIRONMENT (goTags, _parent, _parent->_goTags);
_macros = MAKE_ENVIRONMENT (macros, _parent, _parent->_macros);
_symbolMacros = MAKE_ENVIRONMENT (macros, _parent, _parent->_symbolMacros);
ASSIGN (_knownMacros, [macros allKeys]);
ASSIGN (_knownSymbolMacros, [symbolMacros allKeys]);
ASSIGN (_declarations, declarations);
return self;
}
+(MLKLexicalContext *) globalContext
{
return global_context;
}
-(id) macroForSymbol:(MLKSymbol *)symbol
{
return [_macros valueForSymbol:symbol];
}
-(void) setMacro:(MLKFuncallable *)value forSymbol:(MLKSymbol *)symbol
{
[_symbolMacros setValue:value forSymbol:symbol];
}
-(id) symbolMacroForSymbol:(MLKSymbol *)symbol
{
return [_symbolMacros valueForSymbol:symbol];
}
-(void) setSymbolMacro:(MLKFuncallable *)value forSymbol:(MLKSymbol *)symbol
{
[_symbolMacros setValue:value forSymbol:symbol];
}
-(id) goTagForSymbol:(MLKSymbol *)symbol
{
return [_goTags valueForSymbol:symbol];
}
-(BOOL) symbolNamesFunction:(MLKSymbol *)symbol
{
if ([_functionLocations objectForKey:(symbol ? (id)symbol : (id)[NSNull null])])
return YES;
else if ([_knownMacros containsObject:(symbol ? (id)symbol : (id)[NSNull null])])
return NO;
else
return (_parent && [_parent symbolNamesFunction:symbol]);
}
-(BOOL) symbolNamesMacro:(MLKSymbol *)symbol
{
if ([_functionLocations objectForKey:(symbol ? (id)symbol : (id)[NSNull null])])
return NO;
else if ([_knownMacros containsObject:(symbol ? (id)symbol : (id)[NSNull null])])
return YES;
else
return (_parent && [_parent symbolNamesMacro:symbol]);
}
-(BOOL) symbolNamesSymbolMacro:(MLKSymbol *)symbol
{
if ([_variableLocations objectForKey:(symbol ? (id)symbol : (id)[NSNull null])])
return NO;
else if ([_knownSymbolMacros containsObject:(symbol ? (id)symbol : (id)[NSNull null])])
return YES;
else
return (_parent && [_parent symbolNamesSymbolMacro:symbol]);
}
-(BOOL) variableIsLexical:(MLKSymbol *)symbol
{
id rest;
rest = _declarations;
while (rest)
{
id item = [rest car];
if ([[item cdr] car] == symbol)
{
if ([item car] == LEXICAL)
return YES;
else if ([item car] == SPECIAL)
return NO;
}
rest = [rest cdr];
}
// Has the variable been globally proclaimed special?
rest = [MLKLexicalContext globalContext]->_declarations;
while (rest)
{
id item = [rest car];
if ([[item cdr] car] == symbol)
{
if ([item car] == LEXICAL)
return YES;
else if ([item car] == SPECIAL)
return NO;
}
rest = [rest cdr];
}
return YES;
}
-(void) addVariable:(MLKSymbol *)symbol
{
[_variableLocations setObject:[NSNull null] forKey:symbol];
}
-(void) addFunction:(MLKSymbol *)symbol
{
[_functionLocations setObject:[NSNull null] forKey:symbol];
}
-(void) dealloc
{
RELEASE (_macros);
RELEASE (_knownMacros);
RELEASE (_knownSymbolMacros);
RELEASE (_symbolMacros);
RELEASE (_goTags);
RELEASE (_functionLocations);
RELEASE (_declarations);
RELEASE (_parent);
[super dealloc];
}
@end
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