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//
// CallbackDelegate.m
// MacGap
//
// Created by Joe Hildebrand on 1/10/12.
// Copyright (c) 2012 Twitter. All rights reserved.
//
#import "CallbackDelegate.h"
#import <JavaScriptCore/JavaScript.h>
@implementation CallbackDelegate
@synthesize callback;
- (id) initWithContext:(JSContextRef)aContext forCallback:(WebScriptObject*)aCallback
{
if (!aCallback)
return nil;
if ([aCallback isKindOfClass:[WebUndefined class]])
return nil;
self = [super initWithContext:aContext];
if (!self)
return nil;
callback = [aCallback JSObject];
JSValueProtect(context, callback);
return self;
}
- (void) dealloc
{
if (callback)
{
JSValueUnprotect(context, callback);
callback = nil;
}
}
- (id) objectFromValue:(JSValueRef)val
{
JSStringRef jstr;
NSString *rets;
switch(JSValueGetType(context, val))
{
case kJSTypeUndefined:
case kJSTypeNull:
return nil;
case kJSTypeBoolean:
return [NSNumber numberWithBool:JSValueToBoolean(context, val)];
case kJSTypeNumber:
return [NSNumber numberWithDouble:JSValueToNumber(context, val, NULL)];
case kJSTypeString:
jstr = JSValueToStringCopy(context, val, NULL);
size_t sz = JSStringGetMaximumUTF8CStringSize(jstr);
char *buf = (char*)malloc(sz);
JSStringGetUTF8CString(jstr, buf, sz);
rets = [NSString stringWithUTF8String:buf];
free(buf);
return rets;
case kJSTypeObject:
// TODO: dictionary or something
return nil;
default:
NSAssert(false, @"Invalid JavaScript type");
return nil;
}
}
- (JSValueRef) valueFromObject:(id)obj
{
JSValueRef val = nil;
if (!obj)
{
val = JSValueMakeNull(context);
}
else if ([obj isKindOfClass:[NSString class]])
{
JSStringRef jstr = JSStringCreateWithUTF8CString([obj UTF8String]);
val = JSValueMakeString(context, jstr);
JSStringRelease(jstr);
}
else if ([obj isKindOfClass:[NSNumber class]])
{
val = JSValueMakeNumber(context, [obj doubleValue]);
}
else if ([obj isKindOfClass:[NSDictionary class]])
{
JSObjectRef o = JSObjectMake(context, NULL, NULL);
for (NSString *key in obj)
{
JSStringRef kstr = JSStringCreateWithUTF8CString([key UTF8String]);
JSValueRef v = [self valueFromObject:[obj objectForKey:key]];
JSObjectSetProperty(context, o, kstr, v, kJSPropertyAttributeNone, NULL);
JSStringRelease(kstr);
}
val = o;
}
else if ([obj isKindOfClass:[NSArray class]])
{
NSUInteger pcount = [obj count];
JSValueRef jsArgs[pcount];
NSUInteger i=0;
for (id v in obj)
{
jsArgs[i++] = [self valueFromObject:v];
}
val = JSObjectMakeArray(context, pcount, jsArgs, NULL);
}
else if ([obj isKindOfClass:[NSDate class]])
{
NSTimeInterval secs = [obj timeIntervalSince1970];
JSValueRef jsArgs[1];
// call the Date(milliseconds) constructor in JS
jsArgs[0] = JSValueMakeNumber(context, secs * 1000.0);
val = JSObjectMakeDate(context, 1, jsArgs, NULL);
}
else
{
NSLog(@"Warning: unknown object type for: %@", obj);
val = JSValueMakeUndefined(context);
}
return val;
}
- (id) call
{
NSAssert(callback, @"Callback required");
if (!JSObjectIsFunction(context, callback))
return nil;
JSValueRef jsArgs[0];
JSValueRef ret = JSObjectCallAsFunction(context, callback, NULL, 0, jsArgs, NULL);
return [self objectFromValue:ret];
}
- (id) callWithParams:(id)firstOrNil, ...
{
NSAssert(callback, @"Callback required");
if (!JSObjectIsFunction(context, callback))
return nil;
NSUInteger pcount = 0;
id p;
va_list args;
va_start(args, firstOrNil);
for (p=firstOrNil; p; p=va_arg(args, id))
{
pcount++;
}
va_end(args);
JSValueRef jsArgs[pcount];
NSUInteger j = 0;
va_start(args, firstOrNil);
for (p=firstOrNil; p; p=va_arg(args, id))
{
jsArgs[j++] = [self valueFromObject:p];
}
va_end(args);
JSValueRef ret = JSObjectCallAsFunction(context, callback, NULL, j, jsArgs, NULL);
return [self objectFromValue:ret];
}
@end
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