YAJLDocument.m

//
//  YAJLDocument.m
//  YAJL
//
//  Created by Gabriel Handford on 3/1/09.
//  Copyright 2009. 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 "YAJLDocument.h"

@interface YAJLDocument ()
- (void)_pop;
- (void)_popKey;
@end

NSInteger YAJLDocumentStackCapacity = 20;

@implementation YAJLDocument

@synthesize root=root_, parserStatus=parserStatus_, delegate=delegate_;

- (id)init {
  return [self initWithParserOptions:0];
}

- (id)initWithParserOptions:(YAJLParserOptions)parserOptions {
  return [self initWithParserOptions:parserOptions capacity:YAJLDocumentStackCapacity];
}

- (id)initWithParserOptions:(YAJLParserOptions)parserOptions capacity:(NSInteger)capacity {
  if ((self = [super init])) {
    stack_ = [[NSMutableArray alloc] initWithCapacity:YAJLDocumentStackCapacity];
    keyStack_ = [[NSMutableArray alloc] initWithCapacity:YAJLDocumentStackCapacity];    
    parserStatus_ = YAJLParserStatusNone;
    parser_ = [[YAJLParser alloc] initWithParserOptions:parserOptions];
    parser_.delegate = self;
  }
  return self;
}

- (id)initWithData:(NSData *)data parserOptions:(YAJLParserOptions)parserOptions error:(NSError **)error {
  return [self initWithData:data parserOptions:parserOptions capacity:YAJLDocumentStackCapacity error:error];
}

- (id)initWithData:(NSData *)data parserOptions:(YAJLParserOptions)parserOptions capacity:(NSInteger)capacity error:(NSError **)error {
  if ((self = [self initWithParserOptions:parserOptions capacity:capacity])) {    
    [self parse:data error:error];
  }
  return self;
}

- (void)dealloc {
  [stack_ release];
  [keyStack_ release];
  parser_.delegate = nil;
  [parser_ release];  
  [root_ release];
  [super dealloc];
}

- (YAJLParserStatus)parse:(NSData *)data error:(NSError **)error {
  parserStatus_ = [parser_ parse:data];
  if (error) *error = [parser_ parserError];
  return parserStatus_;
}

#pragma mark Delegates

- (void)parser:(YAJLParser *)parser didAdd:(id)value {
  switch (currentType_) {
    case YAJLDecoderCurrentTypeArray:
      [array_ addObject:value];
      if ([delegate_ respondsToSelector:@selector(document:didAddObject:toArray:)])
        [delegate_ document:self didAddObject:value toArray:array_];
      break;
    case YAJLDecoderCurrentTypeDict:
      NSParameterAssert(key_);
      if (value) [dict_ setObject:value forKey:key_];
      if ([delegate_ respondsToSelector:@selector(document:didSetObject:forKey:inDictionary:)])
        [delegate_ document:self didSetObject:value forKey:key_ inDictionary:dict_];
      [self _popKey];
      break;
    default:
      break;
  } 
}

- (void)parser:(YAJLParser *)parser didMapKey:(NSString *)key {
  key_ = key;
  [keyStack_ addObject:key_]; // Push
}

- (void)_popKey {
  key_ = nil;
  [keyStack_ removeLastObject]; // Pop  
  if ([keyStack_ count] > 0) 
    key_ = [keyStack_ objectAtIndex:[keyStack_ count]-1]; 
}

- (void)parserDidStartDictionary:(YAJLParser *)parser {
  NSMutableDictionary *dict = [[NSMutableDictionary alloc] initWithCapacity:YAJLDocumentStackCapacity];
  if (!root_) root_ = [dict retain];
  [stack_ addObject:dict]; // Push
  [dict release];
  dict_ = dict;
  currentType_ = YAJLDecoderCurrentTypeDict;  
}

- (void)parserDidEndDictionary:(YAJLParser *)parser {
  id value = [[stack_ objectAtIndex:[stack_ count]-1] retain];
  NSDictionary *dict = dict_;
  [self _pop];
  [self parser:parser didAdd:value];
  [value release];
  if ([delegate_ respondsToSelector:@selector(document:didAddDictionary:)])
    [delegate_ document:self didAddDictionary:dict];
}

- (void)parserDidStartArray:(YAJLParser *)parser {
  NSMutableArray *array = [[NSMutableArray alloc] initWithCapacity:YAJLDocumentStackCapacity];
  if (!root_) root_ = [array retain];
  [stack_ addObject:array]; // Push
  [array release];
  array_ = array;
  currentType_ = YAJLDecoderCurrentTypeArray;
}

- (void)parserDidEndArray:(YAJLParser *)parser {
  id value = [[stack_ objectAtIndex:[stack_ count]-1] retain];
  NSArray *array = array_;
  [self _pop];  
  [self parser:parser didAdd:value];
  [value release];
  if ([delegate_ respondsToSelector:@selector(document:didAddArray:)])
    [delegate_ document:self didAddArray:array];
}

- (void)_pop {
  [stack_ removeLastObject];
  array_ = nil;
  dict_ = nil;
  currentType_ = YAJLDecoderCurrentTypeNone;

  id value = nil;
  if ([stack_ count] > 0) value = [stack_ objectAtIndex:[stack_ count]-1];
  if ([value isKindOfClass:[NSArray class]]) {    
    array_ = (NSMutableArray *)value;
    currentType_ = YAJLDecoderCurrentTypeArray;
  } else if ([value isKindOfClass:[NSDictionary class]]) {    
    dict_ = (NSMutableDictionary *)value;
    currentType_ = YAJLDecoderCurrentTypeDict;
  }
}

@end