NSAppleScript's compileAndReturnError always succeeds

[Paul J. Lucas]

Given that NSAppleScript objects are always supposed to run on the  
main thread, I created a small "proxy" object to use:

    @interface AppleScriptProxy : NSObject {
        NSAppleScript *m_script;
        NSDictionary *m_errorDict;
    }
    - (id) init;

    - (void) compileScript:
        (NSString*)script;

    - (void) dealloc;

    - (NSDictionary*) errorDict;

    - (BOOL) failed;

    - (void) runScript:
        (id)notUsed;

    @end

    @implementation AppleScriptProxy

    - (id) init
    {
        self = [super init];
        m_errorDict = nil;
        m_script = nil;
        return self;
    }

    - (void) dealloc
    {
        //[m_errorDict release];
        [m_script release];
        [super dealloc];
    }

    - (void) compileScript:
        (NSString*)source
    {
        m_script = [[NSAppleScript alloc] initWithSource:source];
        if ( m_script )
            if ( [m_script compileAndReturnError:&m_errorDict] ) {
                cerr << "compiled" << endl;
                [m_script retain];
            } else {
                cerr << "not compiled" << endl;
                m_script = nil;
            }
    }

    - (NSDictionary*) errorDict
    {
        return m_errorDict;
    }

    - (BOOL) failed
    {
        return !m_script || m_errorDict;
    }

    - (void) runScript:
        (id)notUsed
    {
        [m_script executeAndReturnError:nil];
    }

    @end

Then, to compile and execute an AppleScript:

    NSString *const script = /* some script */;

    [proxy
        performSelectorOnMainThread:@selector(compileScript:)
        withObject:script waitUntilDone:YES];

    if ( [proxy failed] ) {
        NSString const *const errorMsg = errorDict ?
            [errorDict objectForKey:NSAppleScriptErrorMessage] :
            @"NSAppleScript initWithSource failed";
        cerr << [errorMsg UTF8String] << endl;
        return 1;
    }

    [proxy retain];
    [proxy
        performSelectorOnMainThread:@selector(runScript:)
        withObject:nil waitUntilDone:NO];
    [proxy autorelease];

If I compile a valid script, it works as expected; however, if I  
compile a gibberish script, e.g., "foo", compileAndReturnError doesn't  
fail, i.e., it returns YES and errorDict is still nil.

Why?

- Paul
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