edu.nyu.jet.parser

Class Parsers

java.lang.Object

edu.nyu.jet.parser.Parsers

public class Parsers
extends Object

contains static methods for various types of recognizers and parsers.

Field Summary

Fields

Modifier and Type	Field and Description
static int	BUPARSE a constant indicating that the bottom-up parser, BUParse, should be used to analyze the text
static int	CHARTPARSE a constant indicating that the top-down active chart parser, chartParse, should be used to analyze the text
static boolean	parserTrace if true, causes each parser to write trace messages to the Console.
static int	parserType determines which analyzer will be applied by method parse
static int	RECOGNIZE a constant indicating that the top-down recognizer, recognize, should be used to analyze the text
static int	TDPARSE a constant indicating that the top-down parser, TDParse, should be used to analyze the text

Constructor Summary

Constructors

Constructor and Description
Parsers()

Method Summary

Methods

Modifier and Type	Method and Description
static Vector	BUParse(Document doc, int posn, int end, Grammar gram) apply a bottom-up ('immediate constituent') parser to characters posn to end of Document using grammar gram.
static Vector	chartParse(Document doc, int posn, int end, Grammar gram) apply a top-down active chart parser to characters posn to end of Document doc using grammar gram.
static Vector	parse(Document doc, int posn, int end, Grammar gram) parse characters posn to end of Document using grammar gram.
static JMenu	parserMenu() returns a menu for controlling the parser (part of the Console menu bar).
static boolean	recognize(Document doc, int posn, int end, Grammar gram) apply a top-down recognizer to characters posn to end of Document using grammar gram.
static Vector	TDParse(Document doc, int posn, int end, Grammar gram) apply a top-down backtracking parser to characters posn to end of Document using grammar gram.

Methods inherited from class java.lang.Object

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

Field Detail

RECOGNIZE

public static final int RECOGNIZE

a constant indicating that the top-down recognizer, recognize, should be used to analyze the text

See Also:

Constant Field Values

TDPARSE

public static final int TDPARSE

a constant indicating that the top-down parser, TDParse, should be used to analyze the text

See Also:

Constant Field Values

BUPARSE

public static final int BUPARSE

a constant indicating that the bottom-up parser, BUParse, should be used to analyze the text

See Also:

Constant Field Values

CHARTPARSE

public static final int CHARTPARSE

a constant indicating that the top-down active chart parser, chartParse, should be used to analyze the text

See Also:

Constant Field Values

parserType

public static int parserType

determines which analyzer will be applied by method parse

parserTrace

public static boolean parserTrace

if true, causes each parser to write trace messages to the Console.

Constructor Detail

Parsers

public Parsers()

Method Detail

parse

public static Vector parse(Document doc,
           int posn,
           int end,
           Grammar gram)

parse characters posn to end of Document using grammar gram. The type of recognizer / parser used is determined by the value of parserType.

Returns:

a Vector of parses, where each parse is a ParseTreeNode (the root of the parse tree. If no parses are found, an empty Vector is returned.

recognize

public static boolean recognize(Document doc,
                int posn,
                int end,
                Grammar gram)

apply a top-down recognizer to characters posn to end of Document using grammar gram.

Returns:

true if these characters can be recognized as a SENTENCE.

TDParse

public static Vector TDParse(Document doc,
             int posn,
             int end,
             Grammar gram)

apply a top-down backtracking parser to characters posn to end of Document using grammar gram.

Returns:

a Vector of the parses for these characters

BUParse

public static Vector BUParse(Document doc,
             int posn,
             int end,
             Grammar gram)

apply a bottom-up ('immediate constituent') parser to characters posn to end of Document using grammar gram.

Returns:

a Vector of the parses for these characters

chartParse

public static Vector chartParse(Document doc,
                int posn,
                int end,
                Grammar gram)

apply a top-down active chart parser to characters posn to end of Document doc using grammar gram.

Returns:

a Vector of the parses for these characters

parserMenu

public static JMenu parserMenu()

returns a menu for controlling the parser (part of the Console menu bar). Includes menu items for selecting the parserType, controlling the parserTrace, and drawing a parse tree.