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/**
STEngine.m
Scripting engine
Copyright (c) 2002 Free Software Foundation
Written by: Stefan Urbanek <urbanek@host.sk>
Date: 2000
This file is part of the StepTalk project.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#import "STEngine.h"
#import "STEnvironment.h"
#import "STExterns.h"
#import "STFunctions.h"
#import "STLanguageManager.h"
#import "STMethod.h"
#import "STUndefinedObject.h"
#import <Foundation/NSDictionary.h>
#import <Foundation/NSException.h>
#import <Foundation/NSString.h>
#import <Foundation/NSZone.h>
NSZone *STMallocZone = (NSZone *)nil;
void _STInitMallocZone(void)
{
if(!STMallocZone)
{
/* FIXME: do some testing whether there should be YES or NO */
STMallocZone = NSCreateZone(NSPageSize(),NSPageSize(),YES);
}
}
@implementation STEngine
+ (void)initialize
{
_STInitMallocZone();
if(!STNil)
{
STNil = (STUndefinedObject *)NSAllocateObject([STUndefinedObject class],
0, STMallocZone);
}
}
/**
Return a scripting engine for language with specified name. The engine
is get from default language manager.
*/
+ (STEngine *) engineForLanguage:(NSString *)name
{
STLanguageManager *manager = [STLanguageManager defaultManager];
if(!name)
{
[NSException raise:@"STConversationException"
format:@"Unspecified language for a new engine."];
return nil;
}
return [manager createEngineForLanguage:name];
}
+ (STEngine *) engineForLanguageWithName:(NSString *)name
{
NSLog(@"%@ %@ is deprecated, use %@ instead",
[self className], NSStringFromSelector(_cmd), @"engineForLanguage:");
return [self engineForLanguage:name];
}
/** Interpret source code <var>code</var> in a context <var>context</var>.
This is the method, that has to be implemented by those who are writing
a language engine.
<override-subclass />
*/
- (id)interpretScript:(NSString *)script
inContext:(STContext *)context
{
[self subclassResponsibility:_cmd];
return nil;
}
- (BOOL)understandsCode:(NSString *)code
{
[self subclassResponsibility:_cmd];
return NO;
}
- (id <STMethod>)methodFromSource:(NSString *)sourceString
forReceiver:(id)receiver
inContext:(STContext *)env
{
[self subclassResponsibility:_cmd];
return nil;
}
- (id) executeMethod:(id <STMethod>)aMethod
forReceiver:(id)anObject
withArguments:(NSArray *)args
inContext:(STContext *)env
{
[self subclassResponsibility:_cmd];
return nil;
}
@end
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