test NSSpellChecker, show suggestion list for an uncorrect word.

testNSSpellChecker.m

#import <AppKit/NSSpellChecker.h> //import AppKit framework 

void testSpellCheck(){
    NSSpellChecker* checker = [NSSpellChecker sharedSpellChecker];
    NSString * string = @"helo";
    NSRange range = NSMakeRange(0, [string length]);
    NSArray *corrected = [checker guessesForWordRange:range inString:string language:@"en" inSpellDocumentWithTag:0];
    NSLog(@"NSSpellChecker suggestion:%@",corrected);
}

void testCleanupGoogleWords(){
    NSInputStream *inputStream = [[NSInputStream alloc] initWithFileAtPath: @"/Users/ilfe/code/NumberInput_IMKit_Sample/object-c/hallelujahIM/dictionary/google_333333_words.json"];
    [inputStream  open];
    NSMutableDictionary* wordsWithFrequency  = [[NSJSONSerialization JSONObjectWithStream:inputStream
                                                            options:nil
                                                              error:nil] mutableCopy];
    [inputStream close];

    NSArray* words = [wordsWithFrequency allKeys];
    NSSpellChecker* checker = [NSSpellChecker sharedSpellChecker];
    for(NSString* word in words){
        NSRange range = NSMakeRange(0, [word length]);
        NSString *corrected = [checker correctionForWordRange:range inString:word language:@"en" inSpellDocumentWithTag:0];
        if(corrected){
            [wordsWithFrequency removeObjectForKey:word];
        }
       [word release];
       [corrected release];
    }

    NSOutputStream *outputStream = [NSOutputStream outputStreamToFileAtPath:@"/tmp/correct.json"
                                                                     append:NO];
    [outputStream open];
    [NSJSONSerialization writeJSONObject:wordsWithFrequency
                                                      toStream:outputStream
                                                       options:nil
                                                         error:nil];
    [outputStream close];
}