X-Git-Url: https://gerrit.simantics.org/r/gitweb?a=blobdiff_plain;f=bundles%2Forg.simantics.databoard%2Fcpp%2FDataBoardTest%2Flibantlr3c-3.2%2Fsrc%2Fantlr3commontreenodestream.c;fp=bundles%2Forg.simantics.databoard%2Fcpp%2FDataBoardTest%2Flibantlr3c-3.2%2Fsrc%2Fantlr3commontreenodestream.c;h=bef95a5a5b0f4fc18b08ed041e293fe8fd195bb0;hb=969bd23cab98a79ca9101af33334000879fb60c5;hp=0000000000000000000000000000000000000000;hpb=866dba5cd5a3929bbeae85991796acb212338a08;p=simantics%2Fplatform.git

diff --git a/bundles/org.simantics.databoard/cpp/DataBoardTest/libantlr3c-3.2/src/antlr3commontreenodestream.c b/bundles/org.simantics.databoard/cpp/DataBoardTest/libantlr3c-3.2/src/antlr3commontreenodestream.c
new file mode 100644
index 000000000..bef95a5a5
--- /dev/null
+++ b/bundles/org.simantics.databoard/cpp/DataBoardTest/libantlr3c-3.2/src/antlr3commontreenodestream.c
@@ -0,0 +1,968 @@
+/// \file
+/// Defines the implementation of the common node stream the default
+/// tree node stream used by ANTLR.
+///
+
+// [The "BSD licence"]
+// Copyright (c) 2005-2009 Jim Idle, Temporal Wave LLC
+// http://www.temporal-wave.com
+// http://www.linkedin.com/in/jimidle
+//
+// 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.
+
+#include    <antlr3commontreenodestream.h>
+
+#ifdef	ANTLR3_WINDOWS
+#pragma warning( disable : 4100 )
+#endif
+
+// COMMON TREE STREAM API
+//
+static	void						addNavigationNode			(pANTLR3_COMMON_TREE_NODE_STREAM ctns, ANTLR3_UINT32 ttype);
+static	ANTLR3_BOOLEAN				hasUniqueNavigationNodes	(pANTLR3_COMMON_TREE_NODE_STREAM ctns);
+static	pANTLR3_BASE_TREE			newDownNode					(pANTLR3_COMMON_TREE_NODE_STREAM ctns);
+static	pANTLR3_BASE_TREE			newUpNode					(pANTLR3_COMMON_TREE_NODE_STREAM ctns);
+static	void						reset						(pANTLR3_COMMON_TREE_NODE_STREAM ctns);
+static	void						push						(pANTLR3_COMMON_TREE_NODE_STREAM ctns, ANTLR3_INT32 index);
+static	ANTLR3_INT32				pop							(pANTLR3_COMMON_TREE_NODE_STREAM ctns);
+//static	ANTLR3_INT32				index						(pANTLR3_COMMON_TREE_NODE_STREAM ctns);
+static	ANTLR3_UINT32				getLookaheadSize			(pANTLR3_COMMON_TREE_NODE_STREAM ctns);
+// TREE NODE STREAM API
+//
+static	pANTLR3_BASE_TREE_ADAPTOR   getTreeAdaptor				(pANTLR3_TREE_NODE_STREAM tns);
+static	pANTLR3_BASE_TREE			getTreeSource				(pANTLR3_TREE_NODE_STREAM tns);
+static	pANTLR3_BASE_TREE			_LT							(pANTLR3_TREE_NODE_STREAM tns, ANTLR3_INT32 k);
+static	pANTLR3_BASE_TREE			get							(pANTLR3_TREE_NODE_STREAM tns, ANTLR3_INT32 k);
+static	void						setUniqueNavigationNodes	(pANTLR3_TREE_NODE_STREAM tns, ANTLR3_BOOLEAN uniqueNavigationNodes);
+static	pANTLR3_STRING				toString					(pANTLR3_TREE_NODE_STREAM tns);
+static	pANTLR3_STRING				toStringSS					(pANTLR3_TREE_NODE_STREAM tns, pANTLR3_BASE_TREE start, pANTLR3_BASE_TREE stop);
+static	void						toStringWork				(pANTLR3_TREE_NODE_STREAM tns, pANTLR3_BASE_TREE start, pANTLR3_BASE_TREE stop, pANTLR3_STRING buf);
+static	void						replaceChildren				(pANTLR3_TREE_NODE_STREAM tns, pANTLR3_BASE_TREE parent, ANTLR3_INT32 startChildIndex, ANTLR3_INT32 stopChildIndex, pANTLR3_BASE_TREE t);
+
+// INT STREAM API
+//
+static	void						consume						(pANTLR3_INT_STREAM is);
+static	ANTLR3_MARKER				tindex						(pANTLR3_INT_STREAM is);
+static	ANTLR3_UINT32				_LA							(pANTLR3_INT_STREAM is, ANTLR3_INT32 i);
+static	ANTLR3_MARKER				mark						(pANTLR3_INT_STREAM is);
+static	void						release						(pANTLR3_INT_STREAM is, ANTLR3_MARKER marker);
+static	void						rewindMark					(pANTLR3_INT_STREAM is, ANTLR3_MARKER marker);
+static	void						rewindLast					(pANTLR3_INT_STREAM is);
+static	void						seek						(pANTLR3_INT_STREAM is, ANTLR3_MARKER index);
+static	ANTLR3_UINT32				size						(pANTLR3_INT_STREAM is);
+
+
+// Helper functions
+//
+static	void						fillBuffer					(pANTLR3_COMMON_TREE_NODE_STREAM ctns, pANTLR3_BASE_TREE t);
+static	void						fillBufferRoot				(pANTLR3_COMMON_TREE_NODE_STREAM ctns);
+
+// Constructors
+//
+static	void						antlr3TreeNodeStreamFree			(pANTLR3_TREE_NODE_STREAM tns);
+static	void						antlr3CommonTreeNodeStreamFree		(pANTLR3_COMMON_TREE_NODE_STREAM ctns);
+
+ANTLR3_API pANTLR3_TREE_NODE_STREAM
+antlr3TreeNodeStreamNew()
+{
+    pANTLR3_TREE_NODE_STREAM stream;
+
+    // Memory for the interface structure
+    //
+    stream  = (pANTLR3_TREE_NODE_STREAM) ANTLR3_CALLOC(1, sizeof(ANTLR3_TREE_NODE_STREAM));
+
+    if	(stream == NULL)
+    {
+		return	NULL;
+    }
+
+    // Install basic API 
+    //
+	stream->replaceChildren = replaceChildren;
+    stream->free			= antlr3TreeNodeStreamFree;
+    
+    return stream;
+}
+
+static void
+antlr3TreeNodeStreamFree(pANTLR3_TREE_NODE_STREAM stream)
+{   
+    ANTLR3_FREE(stream);
+}
+
+ANTLR3_API pANTLR3_COMMON_TREE_NODE_STREAM
+antlr3CommonTreeNodeStreamNewTree(pANTLR3_BASE_TREE tree, ANTLR3_UINT32 hint)
+{
+	pANTLR3_COMMON_TREE_NODE_STREAM stream;
+
+	stream = antlr3CommonTreeNodeStreamNew(tree->strFactory, hint);
+
+	if	(stream == NULL)
+	{
+		return	NULL;
+	}
+	stream->root    = tree;
+
+	return stream;
+}
+
+ANTLR3_API pANTLR3_COMMON_TREE_NODE_STREAM
+antlr3CommonTreeNodeStreamNewStream(pANTLR3_COMMON_TREE_NODE_STREAM inStream)
+{
+	pANTLR3_COMMON_TREE_NODE_STREAM stream;
+
+	// Memory for the interface structure
+	//
+	stream  = (pANTLR3_COMMON_TREE_NODE_STREAM) ANTLR3_CALLOC(1, sizeof(ANTLR3_COMMON_TREE_NODE_STREAM));
+
+	if	(stream == NULL)
+	{
+		return	NULL;
+	}
+
+	// Copy in all the reusable parts of the originating stream and create new
+	// pieces where necessary.
+	//
+
+	// String factory for tree walker
+	//
+	stream->stringFactory		= inStream->stringFactory;
+
+	// Create an adaptor for the common tree node stream
+	//
+	stream->adaptor				= inStream->adaptor;
+
+	// Create space for the tree node stream interface
+	//
+	stream->tnstream	    = antlr3TreeNodeStreamNew();
+
+	if	(stream->tnstream == NULL)
+	{
+		stream->free				(stream);
+
+		return	NULL;
+	}
+
+	// Create space for the INT_STREAM interface
+	//
+	stream->tnstream->istream		    =  antlr3IntStreamNew();
+
+	if	(stream->tnstream->istream == NULL)
+	{
+		stream->tnstream->free		(stream->tnstream);
+		stream->free				(stream);
+
+		return	NULL;
+	}
+
+	// Install the common tree node stream API
+	//
+	stream->addNavigationNode		    =  addNavigationNode;
+	stream->hasUniqueNavigationNodes    =  hasUniqueNavigationNodes;
+	stream->newDownNode					=  newDownNode;
+	stream->newUpNode					=  newUpNode;
+	stream->reset						=  reset;
+	stream->push						=  push;
+	stream->pop							=  pop;
+	stream->getLookaheadSize			=  getLookaheadSize;
+
+	stream->free			    =  antlr3CommonTreeNodeStreamFree;
+
+	// Install the tree node stream API
+	//
+	stream->tnstream->getTreeAdaptor			=  getTreeAdaptor;
+	stream->tnstream->getTreeSource				=  getTreeSource;
+	stream->tnstream->_LT						=  _LT;
+	stream->tnstream->setUniqueNavigationNodes	=  setUniqueNavigationNodes;
+	stream->tnstream->toString					=  toString;
+	stream->tnstream->toStringSS				=  toStringSS;
+	stream->tnstream->toStringWork				=  toStringWork;
+	stream->tnstream->get						=  get;
+
+	// Install INT_STREAM interface
+	//
+	stream->tnstream->istream->consume	    =  consume;
+	stream->tnstream->istream->index	    =  tindex;
+	stream->tnstream->istream->_LA			=  _LA;
+	stream->tnstream->istream->mark			=  mark;
+	stream->tnstream->istream->release	    =  release;
+	stream->tnstream->istream->rewind	    =  rewindMark;
+	stream->tnstream->istream->rewindLast   =  rewindLast;
+	stream->tnstream->istream->seek			=  seek;
+	stream->tnstream->istream->size			=  size;
+
+	// Initialize data elements of INT stream
+	//
+	stream->tnstream->istream->type			= ANTLR3_COMMONTREENODE;
+	stream->tnstream->istream->super	    =  (stream->tnstream);
+
+	// Initialize data elements of TREE stream
+	//
+	stream->tnstream->ctns =  stream;
+
+	// Initialize data elements of the COMMON TREE NODE stream
+	//
+	stream->super					= NULL;
+	stream->uniqueNavigationNodes	= ANTLR3_FALSE;
+	stream->markers					= NULL;
+	stream->nodeStack				= inStream->nodeStack;
+
+	// Create the node list map
+	//
+	stream->nodes	= antlr3VectorNew(DEFAULT_INITIAL_BUFFER_SIZE);
+	stream->p		= -1;
+
+	// Install the navigation nodes     
+	//
+	
+	// Install the navigation nodes     
+	//
+	antlr3SetCTAPI(&(stream->UP));
+	antlr3SetCTAPI(&(stream->DOWN));
+	antlr3SetCTAPI(&(stream->EOF_NODE));
+	antlr3SetCTAPI(&(stream->INVALID_NODE));
+
+	stream->UP.token						= inStream->UP.token;
+	inStream->UP.token->strFactory			= stream->stringFactory;
+	stream->DOWN.token						= inStream->DOWN.token;
+	inStream->DOWN.token->strFactory		= stream->stringFactory;
+	stream->EOF_NODE.token					= inStream->EOF_NODE.token;
+	inStream->EOF_NODE.token->strFactory	= stream->stringFactory;
+	stream->INVALID_NODE.token				= inStream->INVALID_NODE.token;
+	inStream->INVALID_NODE.token->strFactory= stream->stringFactory;
+
+	// Reuse the root tree of the originating stream
+	//
+	stream->root		= inStream->root;
+
+	// Signal that this is a rewriting stream so we don't
+	// free the originating tree. Anything that we rewrite or
+	// duplicate here will be done through the adaptor or 
+	// the original tree factory.
+	//
+	stream->isRewriter	= ANTLR3_TRUE;
+	return stream;
+}
+
+ANTLR3_API pANTLR3_COMMON_TREE_NODE_STREAM
+antlr3CommonTreeNodeStreamNew(pANTLR3_STRING_FACTORY strFactory, ANTLR3_UINT32 hint)
+{
+	pANTLR3_COMMON_TREE_NODE_STREAM stream;
+	pANTLR3_COMMON_TOKEN			token;
+
+	// Memory for the interface structure
+	//
+	stream  = (pANTLR3_COMMON_TREE_NODE_STREAM) ANTLR3_CALLOC(1, sizeof(ANTLR3_COMMON_TREE_NODE_STREAM));
+
+	if	(stream == NULL)
+	{
+		return	NULL;
+	}
+
+	// String factory for tree walker
+	//
+	stream->stringFactory		= strFactory;
+
+	// Create an adaptor for the common tree node stream
+	//
+	stream->adaptor				= ANTLR3_TREE_ADAPTORNew(strFactory);
+
+	if	(stream->adaptor == NULL)
+	{
+		stream->free(stream);
+		return	NULL;
+	}
+
+	// Create space for the tree node stream interface
+	//
+	stream->tnstream	    = antlr3TreeNodeStreamNew();
+
+	if	(stream->tnstream == NULL)
+	{
+		stream->adaptor->free		(stream->adaptor);
+		stream->free				(stream);
+
+		return	NULL;
+	}
+
+	// Create space for the INT_STREAM interface
+	//
+	stream->tnstream->istream		    =  antlr3IntStreamNew();
+
+	if	(stream->tnstream->istream == NULL)
+	{
+		stream->adaptor->free		(stream->adaptor);
+		stream->tnstream->free		(stream->tnstream);
+		stream->free				(stream);
+
+		return	NULL;
+	}
+
+	// Install the common tree node stream API
+	//
+	stream->addNavigationNode		    =  addNavigationNode;
+	stream->hasUniqueNavigationNodes    =  hasUniqueNavigationNodes;
+	stream->newDownNode					=  newDownNode;
+	stream->newUpNode					=  newUpNode;
+	stream->reset						=  reset;
+	stream->push						=  push;
+	stream->pop							=  pop;
+
+	stream->free			    =  antlr3CommonTreeNodeStreamFree;
+
+	// Install the tree node stream API
+	//
+	stream->tnstream->getTreeAdaptor			=  getTreeAdaptor;
+	stream->tnstream->getTreeSource				=  getTreeSource;
+	stream->tnstream->_LT						=  _LT;
+	stream->tnstream->setUniqueNavigationNodes	=  setUniqueNavigationNodes;
+	stream->tnstream->toString					=  toString;
+	stream->tnstream->toStringSS				=  toStringSS;
+	stream->tnstream->toStringWork				=  toStringWork;
+	stream->tnstream->get						=  get;
+
+	// Install INT_STREAM interface
+	//
+	stream->tnstream->istream->consume	    =  consume;
+	stream->tnstream->istream->index	    =  tindex;
+	stream->tnstream->istream->_LA			=  _LA;
+	stream->tnstream->istream->mark			=  mark;
+	stream->tnstream->istream->release	    =  release;
+	stream->tnstream->istream->rewind	    =  rewindMark;
+	stream->tnstream->istream->rewindLast   =  rewindLast;
+	stream->tnstream->istream->seek			=  seek;
+	stream->tnstream->istream->size			=  size;
+
+	// Initialize data elements of INT stream
+	//
+	stream->tnstream->istream->type			= ANTLR3_COMMONTREENODE;
+	stream->tnstream->istream->super	    =  (stream->tnstream);
+
+	// Initialize data elements of TREE stream
+	//
+	stream->tnstream->ctns =  stream;
+
+	// Initialize data elements of the COMMON TREE NODE stream
+	//
+	stream->super					= NULL;
+	stream->uniqueNavigationNodes	= ANTLR3_FALSE;
+	stream->markers					= NULL;
+	stream->nodeStack				= antlr3StackNew(INITIAL_CALL_STACK_SIZE);
+
+	// Create the node list map
+	//
+	if	(hint == 0)
+	{
+		hint = DEFAULT_INITIAL_BUFFER_SIZE;
+	}
+	stream->nodes	= antlr3VectorNew(hint);
+	stream->p		= -1;
+
+	// Install the navigation nodes     
+	//
+	antlr3SetCTAPI(&(stream->UP));
+	antlr3SetCTAPI(&(stream->DOWN));
+	antlr3SetCTAPI(&(stream->EOF_NODE));
+	antlr3SetCTAPI(&(stream->INVALID_NODE));
+
+	token						= antlr3CommonTokenNew(ANTLR3_TOKEN_UP);
+	token->strFactory			= strFactory;
+	token->textState			= ANTLR3_TEXT_CHARP;
+	token->tokText.chars		= (pANTLR3_UCHAR)"UP";
+	stream->UP.token			= token;
+
+	token						= antlr3CommonTokenNew(ANTLR3_TOKEN_DOWN);
+	token->strFactory			= strFactory;
+	token->textState			= ANTLR3_TEXT_CHARP;
+	token->tokText.chars		= (pANTLR3_UCHAR)"DOWN";
+	stream->DOWN.token			= token;
+
+	token						= antlr3CommonTokenNew(ANTLR3_TOKEN_EOF);
+	token->strFactory			= strFactory;
+	token->textState			= ANTLR3_TEXT_CHARP;
+	token->tokText.chars		= (pANTLR3_UCHAR)"EOF";
+	stream->EOF_NODE.token		= token;
+
+	token						= antlr3CommonTokenNew(ANTLR3_TOKEN_INVALID);
+	token->strFactory			= strFactory;
+	token->textState			= ANTLR3_TEXT_CHARP;
+	token->tokText.chars		= (pANTLR3_UCHAR)"INVALID";
+	stream->INVALID_NODE.token	= token;
+
+
+	return  stream;
+}
+
+/// Free up any resources that belong to this common tree node stream.
+///
+static	void			    antlr3CommonTreeNodeStreamFree  (pANTLR3_COMMON_TREE_NODE_STREAM ctns)
+{
+
+	// If this is a rewrting stream, then certain resources
+	// belong to the originating node stream and we do not
+	// free them here.
+	//
+	if	(ctns->isRewriter != ANTLR3_TRUE)
+	{
+		ctns->adaptor			->free  (ctns->adaptor);
+
+		if	(ctns->nodeStack != NULL)
+		{
+			ctns->nodeStack->free(ctns->nodeStack);
+		}
+
+		ANTLR3_FREE(ctns->INVALID_NODE.token);
+		ANTLR3_FREE(ctns->EOF_NODE.token);
+		ANTLR3_FREE(ctns->DOWN.token);
+		ANTLR3_FREE(ctns->UP.token);
+	}
+	
+	if	(ctns->nodes != NULL)
+	{
+		ctns->nodes			->free  (ctns->nodes);
+	}
+	ctns->tnstream->istream ->free  (ctns->tnstream->istream);
+    ctns->tnstream			->free  (ctns->tnstream);
+
+
+    ANTLR3_FREE(ctns);
+}
+
+// ------------------------------------------------------------------------------
+// Local helpers
+//
+
+/// Walk and fill the tree node buffer from the root tree
+///
+static void
+fillBufferRoot(pANTLR3_COMMON_TREE_NODE_STREAM ctns)
+{
+	// Call the generic buffer routine with the root as the
+	// argument
+	//
+	fillBuffer(ctns, ctns->root);
+	ctns->p = 0;					// Indicate we are at buffer start
+}
+
+/// Walk tree with depth-first-search and fill nodes buffer.
+/// Don't add in DOWN, UP nodes if the supplied tree is a list (t is isNilNode)
+// such as the root tree is.
+///
+static void
+fillBuffer(pANTLR3_COMMON_TREE_NODE_STREAM ctns, pANTLR3_BASE_TREE t)
+{
+	ANTLR3_BOOLEAN	nilNode;
+	ANTLR3_UINT32	nCount;
+	ANTLR3_UINT32	c;
+
+	nilNode = ctns->adaptor->isNilNode(ctns->adaptor, t);
+
+	// If the supplied node is not a nil (list) node then we
+	// add in the node itself to the vector
+	//
+	if	(nilNode == ANTLR3_FALSE)
+	{
+		ctns->nodes->add(ctns->nodes, t, NULL);	
+	}
+
+	// Only add a DOWN node if the tree is not a nil tree and
+	// the tree does have children.
+	//
+	nCount = t->getChildCount(t);
+
+	if	(nilNode == ANTLR3_FALSE && nCount>0)
+	{
+		ctns->addNavigationNode(ctns, ANTLR3_TOKEN_DOWN);
+	}
+
+	// We always add any children the tree contains, which is
+	// a recursive call to this function, which will cause similar
+	// recursion and implement a depth first addition
+	//
+	for	(c = 0; c < nCount; c++)
+	{
+		fillBuffer(ctns, ctns->adaptor->getChild(ctns->adaptor, t, c));
+	}
+
+	// If the tree had children and was not a nil (list) node, then we
+	// we need to add an UP node here to match the DOWN node
+	//
+	if	(nilNode == ANTLR3_FALSE && nCount > 0)
+	{
+		ctns->addNavigationNode(ctns, ANTLR3_TOKEN_UP);
+	}
+}
+
+
+// ------------------------------------------------------------------------------
+// Interface functions
+//
+
+/// Reset the input stream to the start of the input nodes.
+///
+static	void		
+reset	    (pANTLR3_COMMON_TREE_NODE_STREAM ctns)
+{
+	if	(ctns->p != -1)
+	{
+		ctns->p									= 0;
+	}
+	ctns->tnstream->istream->lastMarker		= 0;
+
+
+	// Free and reset the node stack only if this is not
+	// a rewriter, which is going to reuse the originating
+	// node streams node stack
+	//
+	if  (ctns->isRewriter != ANTLR3_TRUE)
+    {
+		if	(ctns->nodeStack != NULL)
+		{
+			ctns->nodeStack->free(ctns->nodeStack);
+			ctns->nodeStack = antlr3StackNew(INITIAL_CALL_STACK_SIZE);
+		}
+	}
+}
+
+
+static pANTLR3_BASE_TREE
+LB(pANTLR3_TREE_NODE_STREAM tns, ANTLR3_INT32 k)
+{
+	if	( k==0)
+	{
+		return	&(tns->ctns->INVALID_NODE.baseTree);
+	}
+
+	if	( (tns->ctns->p - k) < 0)
+	{
+		return	&(tns->ctns->INVALID_NODE.baseTree);
+	}
+
+	return tns->ctns->nodes->get(tns->ctns->nodes, tns->ctns->p - k);
+}
+
+/// Get tree node at current input pointer + i ahead where i=1 is next node.
+/// i<0 indicates nodes in the past.  So -1 is previous node and -2 is
+/// two nodes ago. LT(0) is undefined.  For i>=n, return null.
+/// Return null for LT(0) and any index that results in an absolute address
+/// that is negative.
+///
+/// This is analogous to the _LT() method of the TokenStream, but this
+/// returns a tree node instead of a token.  Makes code gen identical
+/// for both parser and tree grammars. :)
+///
+static	pANTLR3_BASE_TREE	    
+_LT	    (pANTLR3_TREE_NODE_STREAM tns, ANTLR3_INT32 k)
+{
+	if	(tns->ctns->p == -1)
+	{
+		fillBufferRoot(tns->ctns);
+	}
+
+	if	(k < 0)
+	{
+		return LB(tns, -k);
+	}
+	else if	(k == 0)
+	{
+		return	&(tns->ctns->INVALID_NODE.baseTree);
+	}
+
+	// k was a legitimate request, 
+	//
+	if	(( tns->ctns->p + k - 1) >= (ANTLR3_INT32)(tns->ctns->nodes->count))
+	{
+		return &(tns->ctns->EOF_NODE.baseTree);
+	}
+
+	return	tns->ctns->nodes->get(tns->ctns->nodes, tns->ctns->p + k - 1);
+}
+
+/// Where is this stream pulling nodes from?  This is not the name, but
+/// the object that provides node objects.
+///
+static	pANTLR3_BASE_TREE	    
+getTreeSource	(pANTLR3_TREE_NODE_STREAM tns)
+{
+    return  tns->ctns->root;
+}
+
+/// Consume the next node from the input stream
+///
+static	void		    
+consume	(pANTLR3_INT_STREAM is)
+{
+    pANTLR3_TREE_NODE_STREAM		tns;
+    pANTLR3_COMMON_TREE_NODE_STREAM	ctns;
+
+    tns	    = (pANTLR3_TREE_NODE_STREAM)(is->super);
+    ctns    = tns->ctns;
+
+	if	(ctns->p == -1)
+	{
+		fillBufferRoot(ctns);
+	}
+	ctns->p++;
+}
+
+static	ANTLR3_UINT32	    
+_LA	    (pANTLR3_INT_STREAM is, ANTLR3_INT32 i)
+{
+	pANTLR3_TREE_NODE_STREAM		tns;
+	pANTLR3_BASE_TREE				t;
+
+	tns	    = (pANTLR3_TREE_NODE_STREAM)(is->super);
+
+	// Ask LT for the 'token' at that position
+	//
+	t = tns->_LT(tns, i);
+
+	if	(t == NULL)
+	{
+		return	ANTLR3_TOKEN_INVALID;
+	}
+
+	// Token node was there so return the type of it
+	//
+	return  t->getType(t);
+}
+
+/// Mark the state of the input stream so that we can come back to it
+/// after a syntactic predicate and so on.
+///
+static	ANTLR3_MARKER	    
+mark	(pANTLR3_INT_STREAM is)
+{
+	pANTLR3_TREE_NODE_STREAM		tns;
+	pANTLR3_COMMON_TREE_NODE_STREAM	ctns;
+
+	tns	    = (pANTLR3_TREE_NODE_STREAM)(is->super);
+	ctns    = tns->ctns;
+
+	if	(tns->ctns->p == -1)
+	{
+		fillBufferRoot(tns->ctns);
+	}
+
+	// Return the current mark point
+	//
+	ctns->tnstream->istream->lastMarker = ctns->tnstream->istream->index(ctns->tnstream->istream);
+
+	return ctns->tnstream->istream->lastMarker;
+}
+
+static	void		    
+release	(pANTLR3_INT_STREAM is, ANTLR3_MARKER marker)
+{
+}
+
+/// Rewind the current state of the tree walk to the state it
+/// was in when mark() was called and it returned marker.  Also,
+/// wipe out the lookahead which will force reloading a few nodes
+/// but it is better than making a copy of the lookahead buffer
+/// upon mark().
+///
+static	void		    
+rewindMark	    (pANTLR3_INT_STREAM is, ANTLR3_MARKER marker)
+{
+	is->seek(is, marker);
+}
+
+static	void		    
+rewindLast	(pANTLR3_INT_STREAM is)
+{
+   is->seek(is, is->lastMarker);
+}
+
+/// consume() ahead until we hit index.  Can't just jump ahead--must
+/// spit out the navigation nodes.
+///
+static	void		    
+seek	(pANTLR3_INT_STREAM is, ANTLR3_MARKER index)
+{
+    pANTLR3_TREE_NODE_STREAM		tns;
+    pANTLR3_COMMON_TREE_NODE_STREAM	ctns;
+
+    tns	    = (pANTLR3_TREE_NODE_STREAM)(is->super);
+    ctns    = tns->ctns;
+
+	ctns->p = ANTLR3_UINT32_CAST(index);
+}
+
+static	ANTLR3_MARKER		    
+tindex	(pANTLR3_INT_STREAM is)
+{
+    pANTLR3_TREE_NODE_STREAM		tns;
+    pANTLR3_COMMON_TREE_NODE_STREAM	ctns;
+
+    tns	    = (pANTLR3_TREE_NODE_STREAM)(is->super);
+    ctns    = tns->ctns;
+
+	return (ANTLR3_MARKER)(ctns->p);
+}
+
+/// Expensive to compute the size of the whole tree while parsing.
+/// This method only returns how much input has been seen so far.  So
+/// after parsing it returns true size.
+///
+static	ANTLR3_UINT32		    
+size	(pANTLR3_INT_STREAM is)
+{
+    pANTLR3_TREE_NODE_STREAM		tns;
+    pANTLR3_COMMON_TREE_NODE_STREAM	ctns;
+
+    tns	    = (pANTLR3_TREE_NODE_STREAM)(is->super);
+    ctns    = tns->ctns;
+
+	if	(ctns->p == -1)
+	{
+		fillBufferRoot(ctns);
+	}
+
+	return ctns->nodes->size(ctns->nodes);
+}
+
+/// As we flatten the tree, we use UP, DOWN nodes to represent
+/// the tree structure.  When debugging we need unique nodes
+/// so instantiate new ones when uniqueNavigationNodes is true.
+///
+static	void		    
+addNavigationNode	    (pANTLR3_COMMON_TREE_NODE_STREAM ctns, ANTLR3_UINT32 ttype)
+{
+	pANTLR3_BASE_TREE	    node;
+
+	node = NULL;
+
+	if	(ttype == ANTLR3_TOKEN_DOWN)
+	{
+		if  (ctns->hasUniqueNavigationNodes(ctns) == ANTLR3_TRUE)
+		{
+			node    = ctns->newDownNode(ctns);
+		}
+		else
+		{
+			node    = &(ctns->DOWN.baseTree);
+		}
+	}
+	else
+	{
+		if  (ctns->hasUniqueNavigationNodes(ctns) == ANTLR3_TRUE)
+		{
+			node    = ctns->newUpNode(ctns);
+		}
+		else
+		{
+			node    = &(ctns->UP.baseTree);
+		}
+	}
+
+	// Now add the node we decided upon.
+	//
+	ctns->nodes->add(ctns->nodes, node, NULL);
+}
+
+
+static	pANTLR3_BASE_TREE_ADAPTOR			    
+getTreeAdaptor	(pANTLR3_TREE_NODE_STREAM tns)
+{
+    return  tns->ctns->adaptor;
+}
+
+static	ANTLR3_BOOLEAN	    
+hasUniqueNavigationNodes	    (pANTLR3_COMMON_TREE_NODE_STREAM ctns)
+{
+    return  ctns->uniqueNavigationNodes;
+}
+
+static	void		    
+setUniqueNavigationNodes	    (pANTLR3_TREE_NODE_STREAM tns, ANTLR3_BOOLEAN uniqueNavigationNodes)
+{
+    tns->ctns->uniqueNavigationNodes = uniqueNavigationNodes;
+}
+
+
+/// Print out the entire tree including DOWN/UP nodes.  Uses
+/// a recursive walk.  Mostly useful for testing as it yields
+/// the token types not text.
+///
+static	pANTLR3_STRING	    
+toString	    (pANTLR3_TREE_NODE_STREAM tns)
+{
+
+    return  tns->toStringSS(tns, tns->ctns->root, NULL);
+}
+
+static	pANTLR3_STRING	    
+toStringSS	    (pANTLR3_TREE_NODE_STREAM tns, pANTLR3_BASE_TREE start, pANTLR3_BASE_TREE stop)
+{
+    pANTLR3_STRING  buf;
+
+    buf = tns->ctns->stringFactory->newRaw(tns->ctns->stringFactory);
+
+    tns->toStringWork(tns, start, stop, buf);
+
+    return  buf;
+}
+
+static	void	    
+toStringWork	(pANTLR3_TREE_NODE_STREAM tns, pANTLR3_BASE_TREE p, pANTLR3_BASE_TREE stop, pANTLR3_STRING buf)
+{
+
+	ANTLR3_UINT32   n;
+	ANTLR3_UINT32   c;
+
+	if	(!p->isNilNode(p) )
+	{
+		pANTLR3_STRING	text;
+
+		text	= p->toString(p);
+
+		if  (text == NULL)
+		{
+			text = tns->ctns->stringFactory->newRaw(tns->ctns->stringFactory);
+
+			text->addc	(text, ' ');
+			text->addi	(text, p->getType(p));
+		}
+
+		buf->appendS(buf, text);
+	}
+
+	if	(p == stop)
+	{
+		return;		/* Finished */
+	}
+
+	n = p->getChildCount(p);
+
+	if	(n > 0 && ! p->isNilNode(p) )
+	{
+		buf->addc   (buf, ' ');
+		buf->addi   (buf, ANTLR3_TOKEN_DOWN);
+	}
+
+	for	(c = 0; c<n ; c++)
+	{
+		pANTLR3_BASE_TREE   child;
+
+		child = p->getChild(p, c);
+		tns->toStringWork(tns, child, stop, buf);
+	}
+
+	if	(n > 0 && ! p->isNilNode(p) )
+	{
+		buf->addc   (buf, ' ');
+		buf->addi   (buf, ANTLR3_TOKEN_UP);
+	}
+}
+
+static	ANTLR3_UINT32	    
+getLookaheadSize	(pANTLR3_COMMON_TREE_NODE_STREAM ctns)
+{
+    return	ctns->tail < ctns->head 
+	    ?	(ctns->lookAheadLength - ctns->head + ctns->tail)
+	    :	(ctns->tail - ctns->head);
+}
+
+static	pANTLR3_BASE_TREE	    
+newDownNode		(pANTLR3_COMMON_TREE_NODE_STREAM ctns)
+{
+    pANTLR3_COMMON_TREE	    dNode;
+    pANTLR3_COMMON_TOKEN    token;
+
+    token					= antlr3CommonTokenNew(ANTLR3_TOKEN_DOWN);
+	token->textState		= ANTLR3_TEXT_CHARP;
+	token->tokText.chars	= (pANTLR3_UCHAR)"DOWN";
+    dNode					= antlr3CommonTreeNewFromToken(token);
+
+    return  &(dNode->baseTree);
+}
+
+static	pANTLR3_BASE_TREE	    
+newUpNode		(pANTLR3_COMMON_TREE_NODE_STREAM ctns)
+{
+    pANTLR3_COMMON_TREE	    uNode;
+    pANTLR3_COMMON_TOKEN    token;
+
+    token					= antlr3CommonTokenNew(ANTLR3_TOKEN_UP);
+	token->textState		= ANTLR3_TEXT_CHARP;
+	token->tokText.chars	= (pANTLR3_UCHAR)"UP";
+    uNode					= antlr3CommonTreeNewFromToken(token);
+
+    return  &(uNode->baseTree);
+}
+
+/// Replace from start to stop child index of parent with t, which might
+/// be a list.  Number of children may be different
+/// after this call.  The stream is notified because it is walking the
+/// tree and might need to know you are monkey-ing with the underlying
+/// tree.  Also, it might be able to modify the node stream to avoid
+/// re-streaming for future phases.
+///
+/// If parent is null, don't do anything; must be at root of overall tree.
+/// Can't replace whatever points to the parent externally.  Do nothing.
+///
+static	void						
+replaceChildren				(pANTLR3_TREE_NODE_STREAM tns, pANTLR3_BASE_TREE parent, ANTLR3_INT32 startChildIndex, ANTLR3_INT32 stopChildIndex, pANTLR3_BASE_TREE t)
+{
+	if	(parent != NULL)
+	{
+		pANTLR3_BASE_TREE_ADAPTOR	adaptor;
+		pANTLR3_COMMON_TREE_ADAPTOR	cta;
+
+		adaptor	= tns->getTreeAdaptor(tns);
+		cta		= (pANTLR3_COMMON_TREE_ADAPTOR)(adaptor->super);
+
+		adaptor->replaceChildren(adaptor, parent, startChildIndex, stopChildIndex, t);
+	}
+}
+
+static	pANTLR3_BASE_TREE
+get							(pANTLR3_TREE_NODE_STREAM tns, ANTLR3_INT32 k)
+{
+	if	(tns->ctns->p == -1)
+	{
+		fillBufferRoot(tns->ctns);
+	}
+
+	return tns->ctns->nodes->get(tns->ctns->nodes, k);
+}
+
+static	void
+push						(pANTLR3_COMMON_TREE_NODE_STREAM ctns, ANTLR3_INT32 index)
+{
+	ctns->nodeStack->push(ctns->nodeStack, ANTLR3_FUNC_PTR(ctns->p), NULL);	// Save current index
+	ctns->tnstream->istream->seek(ctns->tnstream->istream, index);
+}
+
+static	ANTLR3_INT32
+pop							(pANTLR3_COMMON_TREE_NODE_STREAM ctns)
+{
+	ANTLR3_INT32	retVal;
+
+	retVal = ANTLR3_UINT32_CAST(ctns->nodeStack->pop(ctns->nodeStack));
+	ctns->tnstream->istream->seek(ctns->tnstream->istream, retVal);
+	return retVal;
+}