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+//
+//  CJSONSerializer.m
+//  TouchCode
+//
+//  Created by Jonathan Wight on 12/07/2005.
+//  Copyright 2005 toxicsoftware.com. All rights reserved.
+//
+//  Permission is hereby granted, free of charge, to any person
+//  obtaining a copy of this software and associated documentation
+//  files (the "Software"), to deal in the Software without
+//  restriction, including without limitation the rights to use,
+//  copy, modify, merge, publish, distribute, sublicense, and/or sell
+//  copies of the Software, and to permit persons to whom the
+//  Software is furnished to do so, subject to the following
+//  conditions:
+//
+//  The above copyright notice and this permission notice shall be
+//  included in all copies or substantial portions of the Software.
+//
+//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+//  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+//  OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+//  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+//  HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+//  WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+//  FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+//  OTHER DEALINGS IN THE SOFTWARE.
+//
+
+#import "CJSONSerializer.h"
+
+#import "JSONRepresentation.h"
+
+static NSData *kNULL = NULL;
+static NSData *kFalse = NULL;
+static NSData *kTrue = NULL;
+
+@implementation CJSONSerializer
+
++ (void)initialize
+    {
+    NSAutoreleasePool *thePool = [[NSAutoreleasePool alloc] init];
+
+    if (self == [CJSONSerializer class])
+        {
+        if (kNULL == NULL)
+            kNULL = [[NSData alloc] initWithBytesNoCopy:(void *)"null" length:4 freeWhenDone:NO];
+        if (kFalse == NULL)
+            kFalse = [[NSData alloc] initWithBytesNoCopy:(void *)"false" length:5 freeWhenDone:NO];
+        if (kTrue == NULL)
+            kTrue = [[NSData alloc] initWithBytesNoCopy:(void *)"true" length:4 freeWhenDone:NO];
+
+        [thePool release];
+        }
+    }
+
++ (id)serializer
+    {
+    return([[[self alloc] init] autorelease]);
+    }
+    
+- (BOOL)isValidJSONObject:(id)inObject
+    {
+    if ([inObject isKindOfClass:[NSNull class]])
+        {
+        return(YES);
+        }
+    else if ([inObject isKindOfClass:[NSNumber class]])
+        {
+        return(YES);
+        }
+    else if ([inObject isKindOfClass:[NSString class]])
+        {
+        return(YES);
+        }
+    else if ([inObject isKindOfClass:[NSArray class]])
+        {
+        return(YES);
+        }
+    else if ([inObject isKindOfClass:[NSDictionary class]])
+        {
+        return(YES);
+        }
+    else if ([inObject isKindOfClass:[NSData class]])
+        {
+        return(YES);
+        }
+    else if ([inObject respondsToSelector:@selector(JSONDataRepresentation)])
+        {
+        return(YES);
+        }
+    else
+        {
+        return(NO);
+        }
+    }
+
+- (NSData *)serializeObject:(id)inObject error:(NSError **)outError
+    {
+    NSData *theResult = NULL;
+
+    if ([inObject isKindOfClass:[NSNull class]])
+        {
+        theResult = [self serializeNull:inObject error:outError];
+        }
+    else if ([inObject isKindOfClass:[NSNumber class]])
+        {
+        theResult = [self serializeNumber:inObject error:outError];
+        }
+    else if ([inObject isKindOfClass:[NSString class]])
+        {
+        theResult = [self serializeString:inObject error:outError];
+        }
+    else if ([inObject isKindOfClass:[NSArray class]])
+        {
+        theResult = [self serializeArray:inObject error:outError];
+        }
+    else if ([inObject isKindOfClass:[NSDictionary class]])
+        {
+        theResult = [self serializeDictionary:inObject error:outError];
+        }
+    else if ([inObject isKindOfClass:[NSData class]])
+        {
+        NSString *theString = [[[NSString alloc] initWithData:inObject encoding:NSUTF8StringEncoding] autorelease];
+        theResult = [self serializeString:theString error:outError];
+        }
+    else if ([inObject respondsToSelector:@selector(JSONDataRepresentation)])
+        {
+        theResult = [inObject JSONDataRepresentation];
+        }
+    else
+        {
+        if (outError)
+            {
+            NSDictionary *theUserInfo = [NSDictionary dictionaryWithObjectsAndKeys:
+                [NSString stringWithFormat:@"Cannot serialize data of type '%@'", NSStringFromClass([inObject class])], NSLocalizedDescriptionKey,
+                NULL];
+            *outError = [NSError errorWithDomain:@"TODO_DOMAIN" code:CJSONSerializerErrorCouldNotSerializeDataType userInfo:theUserInfo];
+            }
+        return(NULL);
+        }
+    if (theResult == NULL)
+        {
+        if (outError)
+            {
+            NSDictionary *theUserInfo = [NSDictionary dictionaryWithObjectsAndKeys:
+                [NSString stringWithFormat:@"Could not serialize object '%@'", inObject], NSLocalizedDescriptionKey,
+                NULL];
+            *outError = [NSError errorWithDomain:@"TODO_DOMAIN" code:CJSONSerializerErrorCouldNotSerializeObject userInfo:theUserInfo];
+            }
+        return(NULL);
+        }
+    return(theResult);
+    }
+
+- (NSData *)serializeNull:(NSNull *)inNull error:(NSError **)outError
+    {
+    #pragma unused (inNull, outError)
+    return(kNULL);
+    }
+
+- (NSData *)serializeNumber:(NSNumber *)inNumber error:(NSError **)outError
+    {
+    #pragma unused (outError)
+    NSData *theResult = NULL;
+    switch (CFNumberGetType((CFNumberRef)inNumber))
+        {
+        case kCFNumberCharType:
+            {
+            int theValue = [inNumber intValue];
+            if (theValue == 0)
+                theResult = kFalse;
+            else if (theValue == 1)
+                theResult = kTrue;
+            else
+                theResult = [[inNumber stringValue] dataUsingEncoding:NSASCIIStringEncoding];
+            }
+            break;
+        case kCFNumberFloat32Type:
+        case kCFNumberFloat64Type:
+        case kCFNumberFloatType:
+        case kCFNumberDoubleType:
+        case kCFNumberSInt8Type:
+        case kCFNumberSInt16Type:
+        case kCFNumberSInt32Type:
+        case kCFNumberSInt64Type:
+        case kCFNumberShortType:
+        case kCFNumberIntType:
+        case kCFNumberLongType:
+        case kCFNumberLongLongType:
+        case kCFNumberCFIndexType:
+        default:
+            theResult = [[inNumber stringValue] dataUsingEncoding:NSASCIIStringEncoding];
+            break;
+        }
+    return(theResult);
+    }
+
+- (NSData *)serializeString:(NSString *)inString error:(NSError **)outError
+    {
+    #pragma unused (outError)
+
+    const char *theUTF8String = [inString UTF8String];
+
+    NSMutableData *theData = [NSMutableData dataWithLength:strlen(theUTF8String) * 2 + 2];
+
+    char *theOutputStart = [theData mutableBytes];
+    char *OUT = theOutputStart;
+
+    *OUT++ = '"';
+
+    for (const char *IN = theUTF8String; IN && *IN != '\0'; ++IN)
+        {
+        switch (*IN)
+            {
+            case '\\':
+                {
+                *OUT++ = '\\';
+                *OUT++ = '\\';
+                }
+                break;
+            case '\"':
+                {
+                *OUT++ = '\\';
+                *OUT++ = '\"';
+                }
+                break;
+            case '/':
+                {
+                *OUT++ = '\\';
+                *OUT++ = '/';
+                }
+                break;
+            case '\b':
+                {
+                *OUT++ = '\\';
+                *OUT++ = 'b';
+                }
+                break;
+            case '\f':
+                {
+                *OUT++ = '\\';
+                *OUT++ = 'f';
+                }
+                break;
+            case '\n':
+                {
+                *OUT++ = '\\';
+                *OUT++ = 'n';
+                }
+                break;
+            case '\r':
+                {
+                *OUT++ = '\\';
+                *OUT++ = 'r';
+                }
+                break;
+            case '\t':
+                {
+                *OUT++ = '\\';
+                *OUT++ = 't';
+                }
+                break;
+            default:
+                {
+                *OUT++ = *IN;
+                }
+                break;
+            }
+        }
+
+    *OUT++ = '"';
+
+    theData.length = OUT - theOutputStart;
+    return(theData);
+    }
+
+- (NSData *)serializeArray:(NSArray *)inArray error:(NSError **)outError
+    {
+    NSMutableData *theData = [NSMutableData data];
+
+    [theData appendBytes:"[" length:1];
+
+    NSEnumerator *theEnumerator = [inArray objectEnumerator];
+    id theValue = NULL;
+    NSUInteger i = 0;
+    while ((theValue = [theEnumerator nextObject]) != NULL)
+        {
+        NSData *theValueData = [self serializeObject:theValue error:outError];
+        if (theValueData == NULL)
+            {
+            return(NULL);
+            }
+        [theData appendData:theValueData];
+        if (++i < [inArray count])
+            [theData appendBytes:"," length:1];
+        }
+
+    [theData appendBytes:"]" length:1];
+
+    return(theData);
+    }
+
+- (NSData *)serializeDictionary:(NSDictionary *)inDictionary error:(NSError **)outError
+    {
+    NSMutableData *theData = [NSMutableData data];
+
+    [theData appendBytes:"{" length:1];
+
+    NSArray *theKeys = [inDictionary allKeys];
+    NSEnumerator *theEnumerator = [theKeys objectEnumerator];
+    NSString *theKey = NULL;
+    while ((theKey = [theEnumerator nextObject]) != NULL)
+        {
+        id theValue = [inDictionary objectForKey:theKey];
+        
+        NSData *theKeyData = [self serializeString:theKey error:outError];
+        if (theKeyData == NULL)
+            {
+            return(NULL);
+            }
+        NSData *theValueData = [self serializeObject:theValue error:outError];
+        if (theValueData == NULL)
+            {
+            return(NULL);
+            }
+        
+        
+        [theData appendData:theKeyData];
+        [theData appendBytes:":" length:1];
+        [theData appendData:theValueData];
+        
+        if (theKey != [theKeys lastObject])
+            [theData appendData:[@"," dataUsingEncoding:NSASCIIStringEncoding]];
+        }
+
+    [theData appendBytes:"}" length:1];
+
+    return(theData);
+    }
+
+@end