Add implementation for text-content in the HTML Element

HTMLKit/HTMLDocument.m

@@ -46,6 +46,10 @@
 
 - (HTMLNode *)adoptNode:(HTMLNode *)node
 {
+	if (node == nil) {
+		return nil;
+	}
+
 	if (node.type == HTMLNodeDocument) {
 		[NSException raise:HTMLKitNotSupportedError
 					format:@"%@: Not Fount Error, adopting a document node. The operation is not supported.", NSStringFromSelector(_cmd)];

HTMLKit/HTMLElement.m

@@ -7,9 +7,11 @@
 //
 
 #import "HTMLElement.h"
+#import "HTMLDocument.h"
+#import "HTMLText.h"
+
 #import "HTMLOrderedDictionary.h"
 #import "NSString+HTMLKit.h"
-#import "HTMLText.h"
 
 @interface HTMLElement ()
 {
@@ -84,8 +86,19 @@
 
 - (NSString *)textContent
 {
-#warning Implement Traversing
-	return nil;
+	NSMutableString *content = [NSMutableString string];
+	for (HTMLNode *node in self.treeEnumerator) {
+		if (node.type == HTMLNodeText) {
+			[content appendString:[(HTMLText *)node data]];
+		}
+	}
+	return content;
+}
+
+- (void)setTextContent:(NSString *)textContent
+{
+	HTMLText *node = [[HTMLText alloc] initWithData:textContent];
+	[self replaceAllChildNodesWithNode:node];
 }
 
 #pragma mark - NSCopying

HTMLKit/HTMLNode.h

@@ -73,6 +73,8 @@ typedef NS_ENUM(short, HTMLNodeType)
 
 - (HTMLNode *)replaceChildNode:(HTMLNode *)node withNode:(HTMLNode *)replacement;
 
+- (void)replaceAllChildNodesWithNode:(HTMLNode *)node;
+
 - (HTMLNode *)removeChildNode:(HTMLNode *)node;
 
 - (HTMLNode *)removeChildNodeAtIndex:(NSUInteger)index;

HTMLKit/HTMLNode.m

@@ -165,6 +165,16 @@
 	return child;
 }
 
+- (void)replaceAllChildNodesWithNode:(HTMLNode *)node
+{
+	[self removeAllChildNodes];
+
+	if (node != nil) {
+		[self.ownerDocument adoptNode:node];
+		[self insertNode:node beforeChildNode:nil];
+	}
+}
+
 - (HTMLNode *)removeChildNode:(HTMLNode *)child
 {
 	if (child.parentNode != self) {

HTMLKit/HTMLText.m

@@ -21,7 +21,7 @@
 {
 	self = [super initWithName:@"#text" type:HTMLNodeText];
 	if (self) {
-		_data = [[NSMutableString alloc] initWithString:data];
+		_data = [[NSMutableString alloc] initWithString:data ?: @""];
 	}
 	return self;
 }