SBJsonParser.h

/*
 Copyright (C) 2009 Stig Brautaset. All rights reserved.
 
 Redistribution and use in source and binary forms, with or without
 modification, are permitted provided that the following conditions are met:
 
 * Redistributions of source code must retain the above copyright notice, this
   list of conditions and the following disclaimer.
 
 * Redistributions in binary form must reproduce the above copyright notice,
   this list of conditions and the following disclaimer in the documentation
   and/or other materials provided with the distribution.
 
 * Neither the name of the author nor the names of its contributors may be used
   to endorse or promote products derived from this software without specific
   prior written permission.
 
 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
 FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#import <Foundation/Foundation.h>

/**
 @brief The JSON parser class.
 
 JSON is mapped to Objective-C types in the following way:
 
 @li Null -> NSNull
 @li String -> NSMutableString
 @li Array -> NSMutableArray
 @li Object -> NSMutableDictionary
 @li Boolean -> NSNumber (initialised with -initWithBool:)
 @li Number -> (NSNumber | NSDecimalNumber)
 
 Since Objective-C doesn't have a dedicated class for boolean values, these turns into NSNumber
 instances. These are initialised with the -initWithBool: method, and 
 round-trip back to JSON properly. (They won't silently suddenly become 0 or 1; they'll be
 represented as 'true' and 'false' again.)
 
 As an optimisation short JSON integers turn into NSNumber instances, while complex ones turn into NSDecimalNumber instances.
 We can thus avoid any loss of precision as JSON allows ridiculously large numbers.
 
 */

@interface SBJsonParser : NSObject {
	id value;
	NSString *error;
    NSUInteger depth, maxDepth;

}

/**
 @brief The maximum recursing depth.
 
 Defaults to 512. If the input is nested deeper than this the input will be deemed to be
 malicious and the parser returns nil, signalling an error. ("Nested too deep".) You can
 turn off this security feature by setting the maxDepth value to 0.
 */
@property NSUInteger maxDepth;

/**
 @brief Return an error trace, or nil if there was no errors.
 
 Note that this method returns the trace of the last method that failed.
 You need to check the return value of the call you're making to figure out
 if the call actually failed, before you know call this method.
 */
@property(copy) NSString *error;

/**
 @brief Return the object represented by the given NSData object.
 
 The data *must* be UTF8 encoded.
 @param data the data to parse.
 
 */
- (id)objectWithData:(NSData*)data;

/**
 @brief Return the object represented by the given string
 
 Returns the object represented by the passed-in string or nil on error. The returned object can be
 a string, number, boolean, null, array or dictionary.
 
 @param repr the json string to parse
 */
- (id)objectWithString:(NSString *)repr;

/**
 @brief Return the object represented by the given string
 
 Returns the object represented by the passed-in string or nil on error. The returned object can be
 a string, number, boolean, null, array or dictionary.
 
 @param jsonText the json string to parse
 @param error pointer to an NSError object to populate on error
 */

- (id)objectWithString:(NSString*)jsonText
                 error:(NSError**)error;

@end