Package schrodinger :: Package application :: Package desmond :: Package antlr3 :: Module tree :: Class TreeNodeStream

Class TreeNodeStream

       object --+    
                |    
streams.IntStream --+
                    |
                   TreeNodeStream

Known Subclasses:

CommonTreeNodeStream

@brief A stream of tree nodes

It accessing nodes from a tree of some kind.

Instance Methods

[hide private]

get(self, i)
Get a tree node at an absolute index i; 0..n-1.

LT(self, k)
Get tree node at current input pointer + i ahead where i=1 is next node.

getTreeSource(self)
Where is this stream pulling nodes from? This is not the name, but the object that provides node objects.

getTokenStream(self)
If the tree associated with this stream was created from a TokenStream, you can specify it here.

getTreeAdaptor(self)
What adaptor can tell me how to interpret/navigate nodes and trees.

setUniqueNavigationNodes(self, uniqueNavigationNodes)
As we flatten the tree, we use UP, DOWN nodes to represent the tree structure.

toString(self, start, stop)
Return the text of all nodes from start to stop, inclusive.

replaceChildren(self, parent, startChildIndex, stopChildIndex, t)
Replace from start to stop child index of parent with t, which might be a list.

Inherited from streams.IntStream: LA, consume, getSourceName, index, mark, release, rewind, seek, size

Inherited from object: __delattr__, __format__, __getattribute__, __hash__, __init__, __new__, __reduce__, __reduce_ex__, __repr__, __setattr__, __sizeof__, __str__, __subclasshook__

Properties

[hide private]

Inherited from object: __class__

Method Details

[hide private]

get(self, i)

Get a tree node at an absolute index i; 0..n-1. If you don't want to buffer up nodes, then this method makes no sense for you.

LT(self, k)

Get tree node at current input pointer + i ahead where i=1 is next node. i<0 indicates nodes in the past. So LT(-1) is previous node, but implementations are not required to provide results for k < -1. 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 analogus 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. :)

getTokenStream(self)

If the tree associated with this stream was created from a TokenStream, you can specify it here. Used to do rule $text attribute in tree parser. Optional unless you use tree parser rule text attribute or output=template and rewrite=true options.

getTreeAdaptor(self)

What adaptor can tell me how to interpret/navigate nodes and trees. E.g., get text of a node.

setUniqueNavigationNodes(self, uniqueNavigationNodes)

As we flatten the tree, we use UP, DOWN nodes to represent the tree structure. When debugging we need unique nodes so we have to instantiate new ones. When doing normal tree parsing, it's slow and a waste of memory to create unique navigation nodes. Default should be false;

toString(self, start, stop)

Return the text of all nodes from start to stop, inclusive. If the stream does not buffer all the nodes then it can still walk recursively from start until stop. You can always return null or "" too, but users should not access $ruleLabel.text in an action of course in that case.

replaceChildren(self, parent, startChildIndex, stopChildIndex, t)

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 monkeying with the underlying tree. Also, it might be able to modify the node stream to avoid restreaming 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.