add RKXMLParser

Code/Support/Parsers/RKXMLParser.h

@@ -0,0 +1,20 @@
+//
+//  RKXMLParser.h
+//
+//  Created by Jeremy Ellison on 2011-02-28.
+//  Copyright (c) 2011 __MyCompanyName__. All rights reserved.
+//
+
+#import <Foundation/Foundation.h>
+
+/**
+ * This is a dead simple XML parser that uses libxml2 to parse an XML document
+ * into a dictionary. It is designed specifically for use with restkit. It
+ * does not support any fancyness like Namespaces, DTDs, or other nonsense,
+ * It does not save attributes on tags, it only cares about nested content and text.
+ */
+
+@interface RKXMLParser : NSObject {
+}
++ (NSDictionary*)parse:(NSString*)xml;
+@end

Code/Support/Parsers/RKXMLParser.m

@@ -0,0 +1,100 @@
+//
+//  RKXMLParser.mm
+//
+//  Created by Jeremy Ellison on 2011-02-28.
+//  Copyright (c) 2011 __MyCompanyName__. All rights reserved.
+//
+
+#import "RKXMLParser.h"
+//#import <libxml/parser.h>
+#import <libxml2/libxml/parser.h>
+
+@interface RKXMLParser (Private)
+- (NSDictionary*)parse:(NSString*)xml;
+@end
+
+@implementation RKXMLParser
+
++ (NSDictionary*)parse:(NSString*)xml {
+    return [[[self new] autorelease] parse:xml];
+}
+
+- (id)parseNode:(xmlNode*)node {
+    NSMutableArray* nodes = [NSMutableArray array];
+    NSMutableDictionary* attrs = [NSMutableDictionary dictionary];
+    
+    xmlNode* currentNode = NULL;
+    for (currentNode = node; currentNode; currentNode = currentNode->next) {
+        if (currentNode->type == XML_ELEMENT_NODE) {
+            NSString* nodeName = [NSString stringWithCString:(char*)currentNode->name encoding:NSUTF8StringEncoding];
+            id val = [self parseNode:currentNode->children];
+            if ([val isKindOfClass:[NSString class]]) {
+                [attrs setValue:val forKey:nodeName];
+                // Only add attributes to nodes if there actually is one.
+                if (![nodes containsObject:attrs]) {
+                    [nodes addObject:attrs];
+                }
+            } else {
+                NSDictionary* elem = [NSDictionary dictionaryWithObject:val forKey:nodeName];
+                [nodes addObject:elem];
+            }
+        } else if (currentNode->type == XML_TEXT_NODE) {
+            const char* str = xmlNodeGetContent(currentNode);
+            NSString* part = [NSString stringWithCString:str encoding:NSUTF8StringEncoding];
+            if ([[part stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]] length] > 0) {
+                [nodes addObject:part];
+            }
+        }
+    }
+    if ([nodes count] == 1) {
+        return [nodes objectAtIndex:0];
+    }
+    if ([nodes count] == 0) {
+        return @"";
+    }
+    if ([nodes containsObject:attrs]) {
+        // We have both attributes and children. merge everything together.
+        NSMutableDictionary* results = [NSMutableDictionary dictionary];
+        for (NSDictionary* dict in nodes) {
+            [results addEntriesFromDictionary:dict];
+        }
+        return results;
+    }
+    return nodes;
+}
+
+- (NSDictionary*)parse:(NSString*)xml {
+    xmlParserCtxtPtr ctxt; /* the parser context */
+    xmlDocPtr doc; /* the resulting document tree */
+    id result = nil;;
+
+    /* create a parser context */
+    ctxt = xmlNewParserCtxt();
+    if (ctxt == NULL) {
+        fprintf(stderr, "Failed to allocate parser context\n");
+        return nil;
+    }
+    /* Parse the string. */
+    const char* buffer = [xml cStringUsingEncoding:NSUTF8StringEncoding];
+    doc = xmlParseMemory(buffer, strlen(buffer));
+    
+    /* check if parsing suceeded */
+    if (doc == NULL) {
+        fprintf(stderr, "Failed to parse\n");
+    } else {
+	    /* check if validation suceeded */
+        if (ctxt->valid == 0) {
+	        fprintf(stderr, "Failed to validate\n");
+        }
+        
+        /* Parse Doc into Dict */
+        result = [self parseNode:doc->xmlRootNode];
+        
+	    /* free up the resulting document */
+	    xmlFreeDoc(doc);
+    }
+    /* free up the parser context */
+    xmlFreeParserCtxt(ctxt);
+    return result;
+}
+@end