HTMLNode.m

//
//  HTMLNode.m
//  StackOverflow
//
//  Created by Ben Reeves on 09/03/2010.
//  Copyright 2010 Ben Reeves. All rights reserved.
//

#import "HTMLNode.h"
#import <libxml/HTMLtree.h>

@implementation HTMLNode

-(HTMLNode*)parent
{
	return [[[HTMLNode alloc] initWithXMLNode:_node->parent] autorelease];	
}

-(HTMLNode*)nextSibling {
	return [[[HTMLNode alloc] initWithXMLNode:_node->next] autorelease];
}

-(HTMLNode*)previousSibling {
	return [[[HTMLNode alloc] initWithXMLNode:_node->prev] autorelease];	
}

void setAttributeNamed(xmlNode * node, const char * nameStr, const char * value) {
	
	char * newVal = (char *)malloc(strlen(value)+1);
	memcpy (newVal, value, strlen(value)+1);

	for(xmlAttrPtr attr = node->properties; NULL != attr; attr = attr->next)
	{
		if (strcmp((char*)attr->name, nameStr) == 0)
		{				
			for(xmlNode * child = attr->children; NULL != child; child = child->next)
			{
				free(child->content);
				child->content = (xmlChar*)newVal;
				break;
			}
			break;
		}
	}
	
	
}

NSString * getAttributeNamed(xmlNode * node, const char * nameStr)
{
	for(xmlAttrPtr attr = node->properties; NULL != attr; attr = attr->next)
	{
		if (strcmp((char*)attr->name, nameStr) == 0)
		{				
			for(xmlNode * child = attr->children; NULL != child; child = child->next)
			{
				return [NSString stringWithCString:(void*)child->content encoding:NSUTF8StringEncoding];
				
			}
			break;
		}
	}
	
	return NULL;
}

-(NSString*)getAttributeNamed:(NSString*)name
{	
	const char * nameStr = [name UTF8String];
	
	return getAttributeNamed(_node, nameStr);
}

//Returns the class name
-(NSString*)className
{
	return [self getAttributeNamed:@"class"];
}

//Returns the tag name
-(NSString*)tagName
{
	return [NSString stringWithCString:(void*)_node->name encoding:NSUTF8StringEncoding];
}


-(HTMLNode*)firstChild
{
	return [[[HTMLNode alloc] initWithXMLNode:_node->children] autorelease];	
}


-(void)findChildrenWithAttribute:(const char*)attribute matchingName:(const char*)className inXMLNode:(xmlNode *)node inArray:(NSMutableArray*)array allowPartial:(BOOL)partial
{
	xmlNode *cur_node = NULL;
	const char * classNameStr = className;
	//BOOL found = NO;
	
    for (cur_node = node; cur_node; cur_node = cur_node->next) 
	{				
		for(xmlAttrPtr attr = cur_node->properties; NULL != attr; attr = attr->next)
		{
			
			if (strcmp((char*)attr->name, attribute) == 0)
			{				
				for(xmlNode * child = attr->children; NULL != child; child = child->next)
				{
					
					BOOL match = NO;
					if (!partial && strcmp((char*)child->content, classNameStr) == 0)
						match = YES;
					else if (partial && strstr ((char*)child->content, classNameStr) != NULL)
						match = YES;

					if (match)
					{
						//Found node
						HTMLNode * nNode = [[[HTMLNode alloc] initWithXMLNode:cur_node] autorelease];
						[array addObject:nNode];
						break;
					}
				}
				break;
			}
		}
		
		[self findChildrenWithAttribute:attribute matchingName:className inXMLNode:cur_node->children inArray:array allowPartial:partial];
	}	
	
}

-(void)findChildTags:(NSString*)tagName inXMLNode:(xmlNode *)node inArray:(NSMutableArray*)array
{
	xmlNode *cur_node = NULL;
	const char * tagNameStr =  [tagName UTF8String];
	
	if (tagNameStr == nil)
		return;
	
    for (cur_node = node; cur_node; cur_node = cur_node->next) 
	{				
		if (cur_node->name && strcmp((char*)cur_node->name, tagNameStr) == 0)
		{
			HTMLNode * node = [[[HTMLNode alloc] initWithXMLNode:cur_node] autorelease];
			[array addObject:node];
			
		}
		
		[self findChildTags:tagName inXMLNode:cur_node->children inArray:array];
	}	
}


-(NSArray*)findChildTags:(NSString*)tagName
{
	NSMutableArray * array = [NSMutableArray array];
	
	[self findChildTags:tagName inXMLNode:_node->children inArray:array];
	
	return array;
}

-(HTMLNode*)findChildTag:(NSString*)tagName inXMLNode:(xmlNode *)node
{
	xmlNode *cur_node = NULL;
	const char * tagNameStr =  [tagName UTF8String];
	
    for (cur_node = node; cur_node; cur_node = cur_node->next) 
	{				
		if (cur_node && cur_node->name && strcmp((char*)cur_node->name, tagNameStr) == 0)
		{
			return [[[HTMLNode alloc] initWithXMLNode:cur_node] autorelease];
		}
		
		HTMLNode * cNode = [self findChildTag:tagName inXMLNode:cur_node->children];
		if (cNode != NULL)
		{
			return cNode;
		}
	}	
	
	return NULL;
}

-(HTMLNode*)findChildTag:(NSString*)tagName
{
	return [self findChildTag:tagName inXMLNode:_node->children];
}


-(NSArray*)children
{
	xmlNode *cur_node = NULL;
	NSMutableArray * array = [NSMutableArray array]; 

	for (cur_node = _node->children; cur_node; cur_node = cur_node->next) 
	{	
		HTMLNode * node = [[[HTMLNode alloc] initWithXMLNode:cur_node] autorelease];
		[array addObject:node];
	}
	
	return array;
}

/*
-(NSString*)description
{
	NSString * string = [NSString stringWithFormat:@"<%s>%@\n", _node->name, [self contents]];
	
	for (HTMLNode * child in [self children])
	{
		string = [string stringByAppendingString:[child description]];
	}
	
	string = [string stringByAppendingString:[NSString stringWithFormat:@"<%s>\n", _node->name]];

	return string;
}*/

-(HTMLNode*)findChildWithAttribute:(const char*)attribute matchingName:(const char*)name inXMLNode:(xmlNode *)node allowPartial:(BOOL)partial
{
	xmlNode *cur_node = NULL;
	const char * classNameStr = name;
	//BOOL found = NO;

	if (node == NULL)
		return NULL;
	
    for (cur_node = node; cur_node; cur_node = cur_node->next) 
	{		
		for(xmlAttrPtr attr = cur_node->properties; NULL != attr; attr = attr->next)
		{			
			if (strcmp((char*)attr->name, attribute) == 0)
			{				
				for(xmlNode * child = attr->children; NULL != child; child = child->next)
				{
					
					BOOL match = NO;
					if (!partial && strcmp((char*)child->content, classNameStr) == 0)
						match = YES;
					else if (partial && strstr ((char*)child->content, classNameStr) != NULL)
						match = YES;
					
					if (match)
					{					
						return [[[HTMLNode alloc] initWithXMLNode:cur_node] autorelease];
					}
				}
				break;
			}
		}
		
		HTMLNode * cNode = [self findChildWithAttribute:attribute matchingName:name inXMLNode:cur_node->children allowPartial:partial];
		if (cNode != NULL)
		{
			return cNode;
		}
	}	
		
	return NULL;
}

-(HTMLNode*)findChildWithAttribute:(NSString*)attribute matchingName:(NSString*)className allowPartial:(BOOL)partial
{
	return [self findChildWithAttribute:[attribute UTF8String] matchingName:[className UTF8String] inXMLNode:_node->children allowPartial:partial];
}

-(HTMLNode*)findChildOfClass:(NSString*)className
{	
	HTMLNode * node = [self findChildWithAttribute:"class" matchingName:[className UTF8String]  inXMLNode:_node->children allowPartial:NO];
	return node;
}

-(NSArray*)findChildrenWithAttribute:(NSString*)attribute matchingName:(NSString*)className allowPartial:(BOOL)partial
{
	NSMutableArray * array = [NSMutableArray array];

	[self findChildrenWithAttribute:[attribute UTF8String] matchingName:[className UTF8String] inXMLNode:_node->children inArray:array allowPartial:partial];
	
	return array;
}


-(NSArray*)findChildrenOfClass:(NSString*)className
{	
	return [self findChildrenWithAttribute:@"class" matchingName:className allowPartial:NO];
}

-(id)initWithXMLNode:(xmlNode*)xmlNode
{
	if (self = [super init])
	{
		_node = xmlNode;
	}
	return self;
}

-(void)appendChildContentsToString:(NSMutableString*)string inNode:(xmlNode*)node
{
	if (node == NULL)
		return;
	
	xmlNode *cur_node = NULL;	
    for (cur_node = node; cur_node; cur_node = cur_node->next) 
	{
		if (cur_node->content)
		{			
			[string appendString:[NSString stringWithCString:(void*)cur_node->content encoding:NSUTF8StringEncoding]];
		}
		
		[self appendChildContentsToString:string inNode:cur_node->children];
	}
}

-(NSString*)contents
{
	if (_node->children && _node->children->content)
	{
		return [NSString stringWithCString:(void*)_node->children->content encoding:NSUTF8StringEncoding];
	}
	
	return nil;
}

HTMLNodeType nodeType(xmlNode * _node)
{
	if (_node == NULL || _node->name == NULL)
		return HTMLUnkownNode;
	
	const char * tagName = (const char*)_node->name;
	if (strcmp(tagName, "a") == 0)
		return HTMLHrefNode;
	else if (strcmp(tagName, "text") == 0)
		return HTMLTextNode;
	else if (strcmp(tagName, "code") == 0)
		return HTMLCodeNode;
	else if (strcmp(tagName, "span") == 0)
		return HTMLSpanNode;
	else if (strcmp(tagName, "p") == 0)
		return HTMLPNode;
	else if (strcmp(tagName, "ul") == 0)
		return HTMLUlNode;
	else if (strcmp(tagName, "li") == 0)
		return HTMLLiNode;
	else if (strcmp(tagName, "image") == 0)
		return HTMLImageNode;
	else if (strcmp(tagName, "ol") == 0)
		return HTMLOlNode;
	else if (strcmp(tagName, "strong") == 0)
		return HTMLStrongNode;
	else if (strcmp(tagName, "pre") == 0)
		return HTMLPreNode;
	else if (strcmp(tagName, "blockquote") == 0)
		return HTMLBlockQuoteNode;
	else
		return HTMLUnkownNode;
	
}

-(HTMLNodeType)nodetype
{
	return nodeType(_node);
}

NSString * allNodeContents(xmlNode*node)
{
	if (node == NULL)
		return nil;
	
	void * contents = xmlNodeGetContent(node);
	if (contents)
	{
		
		NSString * string = [NSString stringWithCString:contents encoding:NSUTF8StringEncoding];
		xmlFree(contents);
		return string;
	}
	
	return @"";
}

-(NSString*)allContents
{
	return allNodeContents(_node);
}

NSString * rawContentsOfNode(xmlNode * node)
{	
	xmlBufferPtr buffer = xmlBufferCreateSize(1000);
	xmlOutputBufferPtr buf = xmlOutputBufferCreateBuffer(buffer, NULL);
	
	htmlNodeDumpOutput(buf, node->doc, node, (const char*)node->doc->encoding);
		
	xmlOutputBufferFlush(buf);
		
	NSString * string = nil;
	
	if (buffer->content) {
		string = [[[NSString alloc] initWithBytes:(const void *)xmlBufferContent(buffer) length:xmlBufferLength(buffer) encoding:NSUTF8StringEncoding] autorelease];
	}
	
	xmlOutputBufferClose(buf);
	xmlBufferFree(buffer);
	
	return string;
}

-(NSString*)rawContents {
	return rawContentsOfNode(_node);
}

@end