CXMLElement.m

//
//  CXMLElement.m
//  TouchCode
//
//  Created by Jonathan Wight on 03/07/08.
//  Copyright 2008 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 "CXMLElement.h"

#import "CXMLNode_PrivateExtensions.h"
#import "CXMLNode_CreationExtensions.h"
#import "CXMLNamespaceNode.h"

@implementation CXMLElement

- (NSArray *)elementsForName:(NSString *)name
{
NSMutableArray *theElements = [NSMutableArray array];

// TODO -- native xml api?
const xmlChar *theName = (const xmlChar *)[name UTF8String];

xmlNodePtr theCurrentNode = _node->children;
while (theCurrentNode != NULL)
	{
	if (theCurrentNode->type == XML_ELEMENT_NODE && xmlStrcmp(theName, theCurrentNode->name) == 0)
		{
		CXMLNode *theNode = [CXMLNode nodeWithLibXMLNode:(xmlNodePtr)theCurrentNode freeOnDealloc:NO];
		[theElements addObject:theNode];
		}
	theCurrentNode = theCurrentNode->next;
	}
return(theElements);
}

- (NSArray *)elementsForLocalName:(NSString *)localName URI:(NSString *)URI
{
	if (URI == nil || [URI length] == 0)
		return [self elementsForName:localName];
	
	NSMutableArray *theElements = [NSMutableArray array];
	const xmlChar *theLocalName = (const xmlChar *)[localName UTF8String];
	const xmlChar *theNamespaceName = (const xmlChar *)[URI UTF8String];
	
	xmlNodePtr theCurrentNode = _node->children;
	while (theCurrentNode != NULL)
	{
		if (theCurrentNode->type == XML_ELEMENT_NODE 
			&& xmlStrcmp(theLocalName, theCurrentNode->name) == 0
			&& theCurrentNode->ns
			&& xmlStrcmp(theNamespaceName, theCurrentNode->ns->href) == 0)
		{
			CXMLNode *theNode = [CXMLNode nodeWithLibXMLNode:(xmlNodePtr)theCurrentNode freeOnDealloc:NO];
			[theElements addObject:theNode];
		}
		theCurrentNode = theCurrentNode->next;
	}	
	
	return theElements;
}

- (NSArray *)attributes
{
NSMutableArray *theAttributes = [NSMutableArray array];
xmlAttrPtr theCurrentNode = _node->properties;
while (theCurrentNode != NULL)
	{
	CXMLNode *theAttribute = [CXMLNode nodeWithLibXMLNode:(xmlNodePtr)theCurrentNode freeOnDealloc:NO];
	[theAttributes addObject:theAttribute];
	theCurrentNode = theCurrentNode->next;
	}
return(theAttributes);
}

- (CXMLNode *)attributeForName:(NSString *)name
{
	// TODO -- look for native libxml2 function for finding a named attribute (like xmlGetProp)
	
	NSRange split = [name rangeOfString:@":"];
	
	xmlChar *theLocalName = NULL;
	xmlChar *thePrefix = NULL;
	
	if (split.length > 0)
	{
		theLocalName = (xmlChar *)[[name substringFromIndex:split.location + 1] UTF8String];
		thePrefix = (xmlChar *)[[name substringToIndex:split.location] UTF8String];
	} 
	else 
	{
		theLocalName = (xmlChar *)[name UTF8String];
	}
	
	xmlAttrPtr theCurrentNode = _node->properties;
	while (theCurrentNode != NULL)
	{
		if (xmlStrcmp(theLocalName, theCurrentNode->name) == 0)
		{
			if (thePrefix == NULL || (theCurrentNode->ns 
									  && theCurrentNode->ns->prefix 
									  && xmlStrcmp(thePrefix, theCurrentNode->ns->prefix) == 0))
			{
				CXMLNode *theAttribute = [CXMLNode nodeWithLibXMLNode:(xmlNodePtr)theCurrentNode freeOnDealloc:NO];
				return(theAttribute);
			}
		}
		theCurrentNode = theCurrentNode->next;
	}
	return(NULL);
}

- (CXMLNode *)attributeForLocalName:(NSString *)localName URI:(NSString *)URI
{
	if (URI == nil)
		return [self attributeForName:localName];
	
	// TODO -- look for native libxml2 function for finding a named attribute (like xmlGetProp)
	const xmlChar *theLocalName = (const xmlChar *)[localName UTF8String];
	const xmlChar *theNamespaceName = (const xmlChar *)[URI UTF8String];
	
	xmlAttrPtr theCurrentNode = _node->properties;
	while (theCurrentNode != NULL)
	{
		if (theCurrentNode->ns && theCurrentNode->ns->href &&
			xmlStrcmp(theLocalName, theCurrentNode->name) == 0 &&
			xmlStrcmp(theNamespaceName, theCurrentNode->ns->href) == 0)
		{
			CXMLNode *theAttribute = [CXMLNode nodeWithLibXMLNode:(xmlNodePtr)theCurrentNode freeOnDealloc:NO];
			return(theAttribute);
		}
		theCurrentNode = theCurrentNode->next;
	}
	return(NULL);
}

- (NSArray *)namespaces
{
	NSMutableArray *theNamespaces = [[[NSMutableArray alloc] init] autorelease];
	xmlNsPtr theCurrentNamespace = _node->nsDef;
	
	while (theCurrentNamespace != NULL)
	{
		NSString *thePrefix = theCurrentNamespace->prefix ? [NSString stringWithUTF8String:(const char *)theCurrentNamespace->prefix] : @"";
		NSString *theURI = [NSString stringWithUTF8String:(const char *)theCurrentNamespace->href];
		CXMLNamespaceNode *theNode = [[CXMLNamespaceNode alloc] initWithPrefix:thePrefix URI:theURI parentElement:self];
		[theNamespaces addObject:theNode];
		[theNode release];		
		
		theCurrentNamespace = theCurrentNamespace->next;
	}
	
	return theNamespaces;
}

- (CXMLNode *)namespaceForPrefix:(NSString *)name
{
	const xmlChar *thePrefix = (const xmlChar *)[name UTF8String];
	xmlNsPtr theCurrentNamespace = _node->nsDef;
	
	while (theCurrentNamespace != NULL)
	{
		if (xmlStrcmp(theCurrentNamespace->prefix, thePrefix) == 0)
		{
			NSString *thePrefix = theCurrentNamespace->prefix ? [NSString stringWithUTF8String:(const char *)theCurrentNamespace->prefix] : @"";
			NSString *theURI = [NSString stringWithUTF8String:(const char *)theCurrentNamespace->href];
			return [[[CXMLNamespaceNode alloc] initWithPrefix:thePrefix URI:theURI parentElement:self] autorelease];
		}			
		theCurrentNamespace = theCurrentNamespace->next;
	}
	return nil;
}

- (CXMLNode *)resolveNamespaceForName:(NSString *)name
{
	NSRange split = [name rangeOfString:@":"];
	
	if (split.length > 0)
		return [self namespaceForPrefix:[name substringToIndex:split.location]];
	
	xmlNsPtr theCurrentNamespace = _node->nsDef;
	
	while (theCurrentNamespace != NULL)
	{
		if (theCurrentNamespace->prefix == 0 
			|| (theCurrentNamespace->prefix)[0] == 0)
		{
			NSString *thePrefix = theCurrentNamespace->prefix ? [NSString stringWithUTF8String:(const char *)theCurrentNamespace->prefix] : @"";
			NSString *theURI = [NSString stringWithUTF8String:(const char *)theCurrentNamespace->href];
			return [[[CXMLNamespaceNode alloc] initWithPrefix:thePrefix URI:theURI parentElement:self] autorelease];
		}			
		theCurrentNamespace = theCurrentNamespace->next;
	}
	
	return nil;
}

- (NSString *)resolvePrefixForNamespaceURI:(NSString *)namespaceURI
{
	const xmlChar *theXMLURI = (const xmlChar *)[namespaceURI UTF8String];
	
	xmlNsPtr theCurrentNamespace = _node->nsDef;
	
	while (theCurrentNamespace != NULL)
	{
		if (xmlStrcmp(theCurrentNamespace->href, theXMLURI) == 0)
		{
			if(theCurrentNamespace->prefix) 
				return [NSString stringWithUTF8String:(const char *)theCurrentNamespace->prefix];
			
			return @"";
		}			
		theCurrentNamespace = theCurrentNamespace->next;
	}
	return nil;
}

//- (NSString*)_XMLStringWithOptions:(NSUInteger)options appendingToString:(NSMutableString*)str
//{
//NSString* name = [self name];
//[str appendString:[NSString stringWithFormat:@"<%@", name]];
//
//for (id attribute in [self attributes] )
//	{
//	[attribute _XMLStringWithOptions:options appendingToString:str];
//	}
//
//if ( ! _node->children )
//	{
//	bool isEmpty = NO;
//	NSArray *emptyTags = [NSArray arrayWithObjects: @"br", @"area", @"link", @"img", @"param", @"hr", @"input", @"col", @"base", @"meta", nil ];
//	for (id s in emptyTags)
//		{
//		if ( [s isEqualToString:@"base"] )
//			{
//			isEmpty = YES;
//			break;
//			}
//		}
//	if ( isEmpty )
//		{
//		[str appendString:@"/>"];
//		return str;
//		}
//	}
//
//[str appendString:@">"];
//	
//if ( _node->children )
//	{
//	for (id child in [self children])
//		[child _XMLStringWithOptions:options appendingToString:str];
//	}
//[str appendString:[NSString stringWithFormat:@"</%@>", name]];
//return str;
//}

- (NSString *)description
{
	NSAssert(_node != NULL, @"TODO");
	
	return([NSString stringWithFormat:@"<%@ %p [%p] %@ %@>", NSStringFromClass([self class]), self, self->_node, [self name], [self XMLStringWithOptions:0]]);
}

@end