CXMLNode_XPathExtensions.m 3.34 KB
Newer Older
Pierre's avatar
Pierre committed
1 2 3 4 5
//
//  CXMLNode_XPathExtensions.m
//  TouchCode
//
//  Created by Jonathan Wight on 04/01/08.
6
//  Copyright 2011 toxicsoftware.com. All rights reserved.
Pierre's avatar
Pierre committed
7
//
8 9
//  Redistribution and use in source and binary forms, with or without modification, are
//  permitted provided that the following conditions are met:
Pierre's avatar
Pierre committed
10
//
11 12
//     1. Redistributions of source code must retain the above copyright notice, this list of
//        conditions and the following disclaimer.
Pierre's avatar
Pierre committed
13
//
14 15 16
//     2. 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.
Pierre's avatar
Pierre committed
17
//
18 19 20 21 22 23 24 25 26 27 28 29 30
//  THIS SOFTWARE IS PROVIDED BY TOXICSOFTWARE.COM ``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 TOXICSOFTWARE.COM 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.
//
//  The views and conclusions contained in the software and documentation are those of the
//  authors and should not be interpreted as representing official policies, either expressed
//  or implied, of toxicsoftware.com.
Pierre's avatar
Pierre committed
31 32 33 34

#import "CXMLNode_XPathExtensions.h"

#import "CXMLDocument.h"
35
#import "CXMLDocument_PrivateExtensions.h"
Pierre's avatar
Pierre committed
36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68
#import "CXMLNode_PrivateExtensions.h"

#include <libxml/xpath.h>
#include <libxml/xpathInternals.h>

@implementation CXMLNode (CXMLNode_NamespaceExtensions)

- (NSArray *)nodesForXPath:(NSString *)xpath namespaceMappings:(NSDictionary *)inNamespaceMappings error:(NSError **)error;
{
#pragma unused (error)

NSAssert(_node != NULL, @"TODO");

NSArray *theResult = NULL;

xmlXPathContextPtr theXPathContext = xmlXPathNewContext(_node->doc);
theXPathContext->node = _node;

for (NSString *thePrefix in inNamespaceMappings)
	{
	xmlXPathRegisterNs(theXPathContext, (xmlChar *)[thePrefix UTF8String], (xmlChar *)[[inNamespaceMappings objectForKey:thePrefix] UTF8String]);
	}

// TODO considering putting xmlChar <-> UTF8 into a NSString category
xmlXPathObjectPtr theXPathObject = xmlXPathEvalExpression((const xmlChar *)[xpath UTF8String], theXPathContext);
if (xmlXPathNodeSetIsEmpty(theXPathObject->nodesetval))
	theResult = [NSArray array]; // TODO better to return NULL?
else
	{
	NSMutableArray *theArray = [NSMutableArray array];
	int N;
	for (N = 0; N < theXPathObject->nodesetval->nodeNr; N++)
		{
69 70 71 72 73 74
		xmlNodePtr theLibXMLNode = theXPathObject->nodesetval->nodeTab[N];

        CXMLNode *theNode = [CXMLNode nodeWithLibXMLNode:theLibXMLNode freeOnDealloc:YES];
        [self.rootDocument.nodePool addObject:theNode];

		[theArray addObject:theNode];
Pierre's avatar
Pierre committed
75
		}
76

Pierre's avatar
Pierre committed
77 78
	theResult = theArray;
	}
79

Pierre's avatar
Pierre committed
80 81 82 83 84 85 86 87 88 89 90 91
xmlXPathFreeObject(theXPathObject);

xmlXPathFreeContext(theXPathContext);
return(theResult);
}

- (CXMLNode *)nodeForXPath:(NSString *)xpath error:(NSError **)outError
{
return([[self nodesForXPath:xpath error:outError] lastObject]);
}

@end