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/**
STSmalltalkScriptObject.m
Object that represents script
Copyright (c) 2002 Free Software Foundation
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 "STSmalltalkScriptObject.h"
#import "STBytecodeInterpreter.h"
#import "STCompiledScript.h"
#import <Foundation/NSArray.h>
#import <Foundation/NSDebug.h>
#import <Foundation/NSDictionary.h>
#import <Foundation/NSException.h>
#import <Foundation/NSMethodSignature.h>
#import <Foundation/NSString.h>
#import <Foundation/NSAutoreleasePool.h>
#import <Foundation/NSKeyValueCoding.h>
#import <StepTalk/NSInvocation+additions.h>
#import <StepTalk/STEnvironment.h>
#import <StepTalk/STObjCRuntime.h>
#import <StepTalk/STExterns.h>
@implementation STSmalltalkScriptObject
- initWithEnvironment:(STEnvironment *)env
compiledScript:(STCompiledScript *)compiledScript
{
if ((self = [super init]) != nil)
{
NSEnumerator *enumerator;
NSString *varName;
NSDebugLLog(@"STEngine",
@"creating script object %p with ivars %@",compiledScript,
[compiledScript variableNames]);
environment = RETAIN(env);
script = RETAIN(compiledScript);
variables = [[NSMutableDictionary alloc] init];
enumerator = [[compiledScript variableNames] objectEnumerator];
while ((varName = [enumerator nextObject]) != nil)
{
[variables setObject:STNil forKey:varName];
}
}
return self;
}
- (void)dealloc
{
RELEASE(interpreter);
RELEASE(script);
RELEASE(variables);
RELEASE(environment);
[super dealloc];
}
- (STCompiledScript *)script
{
return script;
}
- (void)setValue:(id)value forKey:(NSString *)key
{
if(value == nil)
{
value = STNil;
}
/* FIXME: check this for potential abuse and for speed improvements */
if([variables objectForKey:key])
{
[variables setObject:value forKey:key];
}
else
{
[super setValue:value forKey:key];
}
}
- (id)valueForKey:(NSString *)key
{
id value = [variables objectForKey:key];
if(value)
{
return value;
}
else
{
return [super valueForKey:key];
}
}
- (BOOL)respondsToSelector:(SEL)aSelector
{
NSDebugLLog(@"STSending",
@"?? script object responds to %@",
NSStringFromSelector(aSelector));
if( [super respondsToSelector:(SEL)aSelector] )
{
return YES;
}
return ([script methodWithName:NSStringFromSelector(aSelector)] != nil);
}
- (NSMethodSignature *)methodSignatureForSelector:(SEL)sel
{
NSMethodSignature *signature = nil;
signature = [super methodSignatureForSelector:sel];
if(!signature)
{
signature = STConstructMethodSignatureForSelector(sel);
}
return signature;
}
- (void) forwardInvocation:(NSInvocation *)invocation
{
NSAutoreleasePool *pool = [NSAutoreleasePool new];
STCompiledMethod *method;
NSString *methodName = NSStringFromSelector([invocation selector]);
NSMutableArray *args;
id arg;
NSUInteger index;
NSUInteger count;
id retval = nil;
if(!interpreter)
{
NSDebugLLog(@"STEngine",
@"creating new interpreter for script '%@'",
name);
interpreter = [[STBytecodeInterpreter alloc] initWithEnvironment:environment];
}
if([methodName isEqualToString:@"exit"])
{
[interpreter halt];
[pool release];
[invocation setReturnValue:&retval];
return;
}
method = [script methodWithName:methodName];
if (method == nil)
{
[pool release];
[super forwardInvocation:invocation];
return;
}
count = [[invocation methodSignature] numberOfArguments];
NSDebugLLog(@"STSending",
@"script object perform: %@ with %lu args",
methodName,(unsigned long)(count-2));
args = [[NSMutableArray alloc] init];
for(index = 2; index < count; index++)
{
arg = [invocation getArgumentAsObjectAtIndex:index];
if (arg == nil)
{
[args addObject:STNil];
}
else
{
[args addObject:arg];
}
}
// NSDebugLLog(@"STSending",
// @">> forwarding to self ...");
NS_DURING
retval = [interpreter interpretMethod:method
forReceiver:self
arguments:args];
RELEASE(args);
NS_HANDLER
RETAIN(localException);
RELEASE(args);
[pool release];
[AUTORELEASE(localException) raise];
NS_ENDHANDLER
// NSDebugLLog(@"STSending",
// @"<< returned from forwarding");
[invocation setReturnValue:&retval];
[pool release];
}
@end
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