edu.nyu.jet.parser

Class SynFun

java.lang.Object

edu.nyu.jet.parser.SynFun

public class SynFun
extends Object

syntactic functions which retrieve information from parse trees. In general, these should work with trees produced either by the full-sentence (Penn Tree Bank) parser or the partial parser.

Constructor Summary

Constructors

Constructor and Description
SynFun()

Method Summary

Methods

Modifier and Type	Method and Description
static HashMap<Annotation,Annotation>	collectParents(Annotation root) returns a map from each child node to its parent in the parse tree rooted at root.
static String	getDet(Annotation constit) returns the determiner of 'constit', or null if the consitutent has no determiner.
static String	getHead(Document doc, Annotation ann) returns the head string of constituent 'ann' in a parse tree.
static boolean	getHuman(Annotation constit) returns true if noun phrase 'constit' has a human head, as recorded either an a 'human' feature on PA (by the chunk patterns) or an 'nhuman' feature in the dictionary.
static String	getImmediateHead(Annotation node) returns the head string for the current node.
static String	getName(Document doc, Annotation constit) returns the name associated with a noun phrase, as a single string, or null if the np does not have a name.
static String	getNameOrHead(Document doc, Annotation ann) if the head (the end of the 'headC' chain) of constituent 'ann' is a name, return the name itself (with tokens connected by '-'); otherwise return the head as determined by 'getHead'.
static String	getNumber(Annotation constit) returns the number feature of noun phrase 'constit' (singular or plural), or 'null' if the number feature is not specified.
static Object	getPA(Annotation constit) returns the 'pa' feature directly or indirectly associated with parse tree node 'constit'.
static String	headOfPa(Object pa, Annotation ann) returns the head string from the value of the 'pa' feature.

Methods inherited from class java.lang.Object

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

Constructor Detail

SynFun

public SynFun()

Method Detail

getImmediateHead

public static String getImmediateHead(Annotation node)

returns the head string for the current node. If the 'pa' feature has a 'head' feature, return that value (plus the particle, if present as a 'part' feature). If the 'pa' feature is a string, return that string. If 'node' does not have a 'pa' feature, return null.

headOfPa

public static String headOfPa(Object pa,
              Annotation ann)

returns the head string from the value of the 'pa' feature. If the 'pa' feature has a 'head' feature, return that value (plus the particle, if present as a 'part' feature). If the 'pa' feature is a string, return that string. Otherwise there is an error, return "?".

Parameters:

pa - value of pa feature

ann - annotation of which this is the pa feature; used only for error messages

getPA

public static Object getPA(Annotation constit)

returns the 'pa' feature directly or indirectly associated with parse tree node 'constit'. If 'constit' has a pa feature itself, return it; otherwise follow the chain of 'headC' links down the parse tree until a node is found with a 'pa' feature.

getHead

public static String getHead(Document doc,
             Annotation ann)

returns the head string of constituent 'ann' in a parse tree. If there is a 'pa' feature directly or indirectly associated with the constituent, use that to determine the head. Otherwise follow the 'headC' chain and then concatenate (with '-') the tokens of the constituent at the end of the chain.

getName

public static String getName(Document doc,
             Annotation constit)

returns the name associated with a noun phrase, as a single string, or null if the np does not have a name. Whitespace between tokens of a name is normalized to single blanks.

getNameOrHead

public static String getNameOrHead(Document doc,
                   Annotation ann)

if the head (the end of the 'headC' chain) of constituent 'ann' is a name, return the name itself (with tokens connected by '-'); otherwise return the head as determined by 'getHead'.

getDet

public static String getDet(Annotation constit)

returns the determiner of 'constit', or null if the consitutent has no determiner. The determiner may appear either as an attribute of the constituent, or as an attribute of the pa feature of the constituent.

getNumber

public static String getNumber(Annotation constit)

returns the number feature of noun phrase 'constit' (singular or plural), or 'null' if the number feature is not specified.

getHuman

public static boolean getHuman(Annotation constit)

returns true if noun phrase 'constit' has a human head, as recorded either an a 'human' feature on PA (by the chunk patterns) or an 'nhuman' feature in the dictionary.

collectParents

public static HashMap<Annotation,Annotation> collectParents(Annotation root)

returns a map from each child node to its parent in the parse tree rooted at root.