Appendix D: Scripting Support Categories
This appendix lists a sample implementation of the categories discussed in Scripting Support Class Extensions. For more information on the NSAppleEventDescriptor
class, consult NSAppleEventDescriptor Class Reference.
/* |
File: ScriptingSupportCategories.m |
Abstract: Cocoa Scripting Support Categories implementations |
Version: 1.6 |
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*/ |
#import "ScriptingSupportCategories.h" |
#import <Carbon/Carbon.h> |
@implementation NSDictionary (UserDefinedRecord) |
+(NSDictionary*)scriptingUserDefinedRecordWithDescriptor:(NSAppleEventDescriptor*)desc |
{ |
NSMutableDictionary* dict = [NSMutableDictionary dictionaryWithCapacity:0]; |
NSAppleEventDescriptor* userFieldItems = [desc descriptorForKeyword:keyASUserRecordFields]; |
NSInteger numItems = [userFieldItems numberOfItems]; |
for ( NSInteger itemIndex = 1; itemIndex <= numItems - 1; itemIndex += 2 ) { |
NSAppleEventDescriptor* keyDesc = [userFieldItems descriptorAtIndex:itemIndex]; |
NSAppleEventDescriptor* valueDesc = [userFieldItems descriptorAtIndex:itemIndex + 1]; |
NSString* keyString = [keyDesc stringValue]; |
id value = [valueDesc objectValue]; |
if ( keyString != nil && value != nil ) |
[dict setObject:value forKey:keyString]; |
} |
return [NSDictionary dictionaryWithDictionary:dict]; |
} |
-(NSAppleEventDescriptor*)scriptingUserDefinedRecordDescriptor |
{ |
NSAppleEventDescriptor* recordDesc = [NSAppleEventDescriptor recordDescriptor]; |
NSAppleEventDescriptor* userFieldDesc = [NSAppleEventDescriptor listDescriptor]; |
NSInteger userFieldIndex = 1; |
for ( id key in self ) { |
if ( [key isKindOfClass:[NSString class]] ) { |
NSString* valueString = nil; |
id value = [self objectForKey:key]; |
if ( ! [value isKindOfClass:[NSString class]] ) |
valueString = [NSString stringWithFormat:@"%@", value]; |
else |
valueString = value; |
NSAppleEventDescriptor* valueDesc = [NSAppleEventDescriptor descriptorWithString:valueString]; |
NSAppleEventDescriptor* keyDesc = [NSAppleEventDescriptor descriptorWithString:key]; |
if ( valueDesc != nil && keyDesc != nil ) { |
[userFieldDesc insertDescriptor:keyDesc atIndex:userFieldIndex++]; |
[userFieldDesc insertDescriptor:valueDesc atIndex:userFieldIndex++]; |
} |
} |
} |
[recordDesc setDescriptor:userFieldDesc forKeyword:keyASUserRecordFields]; |
return recordDesc; |
} |
@end |
@implementation NSArray (UserList) |
+(NSArray*)scriptingUserListWithDescriptor:(NSAppleEventDescriptor*)desc |
{ |
NSMutableArray* array = [NSMutableArray arrayWithCapacity:0]; |
NSInteger numItems = [desc numberOfItems]; |
for ( NSInteger itemIndex = 1; itemIndex <= numItems; itemIndex++ ) { |
NSAppleEventDescriptor* itemDesc = [desc descriptorAtIndex:itemIndex]; |
[array addObject:[itemDesc objectValue]]; |
} |
return [NSArray arrayWithArray:array]; |
} |
-(NSAppleEventDescriptor*)scriptingUserListDescriptor |
{ |
NSAppleEventDescriptor* listDesc = [NSAppleEventDescriptor listDescriptor]; |
NSInteger itemIndex = 1; |
for ( id item in self ) { |
NSAppleEventDescriptor* itemDesc = [NSAppleEventDescriptor descriptorWithObject:item]; |
[listDesc insertDescriptor:itemDesc atIndex:itemIndex++]; |
} |
return listDesc; |
} |
@end |
@implementation NSAppleEventDescriptor (GenericObject) |
+(NSAppleEventDescriptor*)descriptorWithObject:(id)object |
{ |
NSAppleEventDescriptor* desc = nil; |
if ( [object isKindOfClass:[NSArray class]] ) { |
NSArray* array = (NSArray*)object; |
desc = [array scriptingUserListDescriptor]; |
} |
else if ( [object isKindOfClass:[NSDictionary class]] ) { |
NSDictionary* dict = (NSDictionary*)object; |
desc = [dict scriptingUserDefinedRecordDescriptor]; |
} |
else if ( [object isKindOfClass:[NSString class]] ) { |
desc = [NSAppleEventDescriptor descriptorWithString:(NSString*)object]; |
} |
else if ( [object isKindOfClass:[NSURL class]] ) { |
desc = [NSAppleEventDescriptor descriptorWithURL:(NSURL*)object]; |
} |
else { |
NSString* valueString = [NSString stringWithFormat:@"%@", object]; |
desc = [NSAppleEventDescriptor descriptorWithString:valueString]; |
} |
return desc; |
} |
-(id)objectValue |
{ |
DescType descType = [self descriptorType]; |
DescType bigEndianDescType = 0; |
id object = nil; |
switch ( descType ) { |
case typeUnicodeText: |
case typeUTF8Text: |
object = [self stringValue]; |
break; |
case typeFileURL: |
object = [self fileURLValue]; |
break; |
case typeAEList: |
object = [NSArray scriptingUserListWithDescriptor:self]; |
break; |
case typeAERecord: |
object = [NSDictionary scriptingUserDefinedRecordWithDescriptor:self]; |
break; |
case typeSInt16: |
case typeUInt16: |
case typeSInt32: |
case typeUInt32: |
case typeSInt64: |
case typeUInt64: |
object = [NSNumber numberWithInteger:(NSInteger)[self int32Value]]; |
break; |
default: |
bigEndianDescType = EndianU32_NtoB(descType); |
NSLog(@"Creating NSData for AE desc type %.4s.", (char*)&bigEndianDescType); |
object = [self data]; |
break; |
} |
return object; |
} |
@end |
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