edu.nyu.jet.parser

Class ParseTreeNode

java.lang.Object

edu.nyu.jet.parser.Edge

edu.nyu.jet.parser.ParseTreeNode

public class ParseTreeNode
extends Edge

a node of a parse tree.

Field Summary

Fields

Modifier and Type	Field and Description
Annotation	ann for leaf nodes, the (token or constit) annotation matched by this node.
String	function function tag.
int	head for non-leaf nodes, the number of the child (starting at 1) which is the head of this node.
String	word for leaf nodes, the word matched by this node.

Fields inherited from class edu.nyu.jet.parser.Edge

category, children, end, start

Constructor Summary

Constructors

Constructor and Description
ParseTreeNode(Object category, ParseTreeNode[] children, int start, int end, Annotation ann, String word) create a ParseTreeNode corresponding to a leaf of the parse tree.
ParseTreeNode(Object category, ParseTreeNode[] children, int start, int end, Annotation ann, String word, String function) create a ParseTreeNode corresponding to a leaf of the parse tree.
ParseTreeNode(Object category, ParseTreeNode[] children, int start, int end, int head) create a ParseTreeNode corresponding to an internal node of the parse tree.
ParseTreeNode(Object category, ParseTreeNode[] children, int start, int end, int head, String function) create a ParseTreeNode corresponding to an internal node of the parse tree.

Method Summary

Methods

Modifier and Type	Method and Description
static Annotation[]	children(Annotation node) given a parse tree Annotation 'node', as created by makeParseAnnotations, returns an array containing the children of 'node', or null if the node has no children.
static Annotation	makeParseAnnotations(Document doc, ParseTreeNode n) given a parse tree in the form of nested ParseTreeNodes, adds an Annotation of type 'constit' to Document 'doc' for each non-terminal node in the tree.
void	printTree() prints the parse tree rooted at this node in an indented form.
static void	terminalToToken(Document doc, ParseTreeNode node)
String	toString() return a String representation of the ParseTreeNode.

Methods inherited from class edu.nyu.jet.parser.Edge

getChildren

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

ann

public Annotation ann

for leaf nodes, the (token or constit) annotation matched by this node. For non-leaf nodes, = null in parser output. StatParser.makeParseAnnotations sets this field to the annotation generated from this node.

word

public String word

for leaf nodes, the word matched by this node. (For non-leaf nodes, = null.)

head

public int head

for non-leaf nodes, the number of the child (starting at 1) which is the head of this node. = 0 if not set.

function

public String function

function tag. if function tag is not set, this is be null.

Constructor Detail

ParseTreeNode

public ParseTreeNode(Object category,
             ParseTreeNode[] children,
             int start,
             int end,
             Annotation ann,
             String word)

create a ParseTreeNode corresponding to a leaf of the parse tree.

ParseTreeNode

public ParseTreeNode(Object category,
             ParseTreeNode[] children,
             int start,
             int end,
             Annotation ann,
             String word,
             String function)

create a ParseTreeNode corresponding to a leaf of the parse tree.

ParseTreeNode

public ParseTreeNode(Object category,
             ParseTreeNode[] children,
             int start,
             int end,
             int head)

create a ParseTreeNode corresponding to an internal node of the parse tree.

ParseTreeNode

public ParseTreeNode(Object category,
             ParseTreeNode[] children,
             int start,
             int end,
             int head,
             String function)

create a ParseTreeNode corresponding to an internal node of the parse tree.

Method Detail

toString

public String toString()

return a String representation of the ParseTreeNode. This consists of the grammar category, followed -- only for terminal, non-literal nodes -- by the sentence word matched.

Overrides:

toString in class Object

printTree

public void printTree()

prints the parse tree rooted at this node in an indented form.

makeParseAnnotations

public static Annotation makeParseAnnotations(Document doc,
                              ParseTreeNode n)

given a parse tree in the form of nested ParseTreeNodes, adds an Annotation of type 'constit' to Document 'doc' for each non-terminal node in the tree. (Annotations are already present for terminal nodes, as a prerequisite for parsing.) Returns the Annotation associated with the root node of the tree.

children

public static Annotation[] children(Annotation node)

given a parse tree Annotation 'node', as created by makeParseAnnotations, returns an array containing the children of 'node', or null if the node has no children.

Parameters:

node - an Annotation representing a parse tree node (an Annotation of type 'constit').

terminalToToken

public static void terminalToToken(Document doc,
                   ParseTreeNode node)