1 files changed, 149 insertions, 0 deletions
diff --git a/runtime/ObjC/Framework/ANTLRTree.m b/runtime/ObjC/Framework/ANTLRTree.m
new file mode 100644
index 0000000..4d9edaa
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+++ b/runtime/ObjC/Framework/ANTLRTree.m
@@ -0,0 +1,149 @@
+// [The "BSD licence"]
+// Copyright (c) 2006-2007 Kay Roepke
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions
+// are met:
+// 1. Redistributions of source code must retain the above copyright
+//    notice, this list of conditions and the following disclaimer.
+// 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.
+// 3. The name of the author may not be used to endorse or promote products
+//    derived from this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 THE AUTHOR 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.
+
+#import "ANTLRTree.h"
+#import "ANTLRToken.h"
+// TODO: this shouldn't be here...but needed for invalidNode
+#import "ANTLRCommonTree.h"
+
+@implementation ANTLRTree
+
+@synthesize isEmpty;
+@synthesize isEmptyNode;
+@synthesize invalidNode;
+@synthesize children;
+
+#pragma mark ANTLRTree protocol conformance
+
++ (id<ANTLRTree>) invalidNode
+{
+	static id<ANTLRTree> invalidNode = nil;
+	if (!invalidNode) {
+		invalidNode = [[ANTLRCommonTree alloc] initWithTokenType:ANTLRTokenTypeInvalid];
+	}
+	return invalidNode;
+}
+
+- (id<ANTLRTree>) init
+{
+	self = [super init];
+	if ( self != nil ) {
+		isEmptyNode = NO;
+	}
+	return self;
+}
+
+- (void) dealloc
+{
+	[super dealloc];
+}
+
+- (id<ANTLRTree>) getChild:(NSUInteger) index
+{
+	return nil;
+}
+
+- (NSUInteger) getChildCount
+{
+	return 0;
+}
+
+- (NSArray *) getChildren
+{
+	return nil;
+}
+
+	// Add tree as a child to this node.  If tree is nil, do nothing.  If tree
+	// is an empty node, add all children of tree to our children.
+
+- (void) addChild:(id<ANTLRTree>) tree
+{
+}
+
+- (void) addChildren:(NSArray *) theChildren
+{
+}
+
+- (void) removeAllChildren
+{
+}
+
+	// Indicates the node is an empty node but may still have children, meaning
+	// the tree is a flat list.
+
+- (BOOL) isEmpty
+{
+	return isEmptyNode;
+}
+
+- (void) setIsEmpty:(BOOL)emptyFlag
+{
+	isEmptyNode = emptyFlag;
+}
+
+#pragma mark ANTLRTree abstract base class
+
+	// Return a token type; needed for tree parsing
+- (NSInteger) getType
+{
+	return 0;
+}
+
+- (NSString *) getText
+{
+	return [self description];
+}
+
+	// In case we don't have a token payload, what is the line for errors?
+- (NSInteger) getLine
+{
+	return 0;
+}
+
+- (NSInteger) getCharPositionInLine
+{
+	return 0;
+}
+
+- (NSString *) treeDescription
+{
+	return @"";
+}
+
+- (NSString *) description
+{
+	return @"";
+}
+
+- (void) _createChildrenList
+{
+	if ( children == nil )
+		children = [[NSMutableArray alloc] init];
+}
+
+@end
+
+@end
+\ No newline at end of file