de.up.ling.irtg.codec

Class PtbTreeInputCodec

java.lang.Object

de.up.ling.irtg.codec.InputCodec<Tree<String>>

de.up.ling.irtg.codec.PtbTreeInputCodec

public class PtbTreeInputCodec
extends InputCodec<Tree<String>>

Reads trees in the format of the Penn Treebank. An example is this:

(S (NP John) (VP (VB sleeps)))

Author:

koller

Constructor Summary

Constructors

Constructor and Description
PtbTreeInputCodec()

Method Summary

Modifier and Type	Method and Description
boolean	optionExtraBrackets()
Tree<String>	read(InputStream is) Reads a single tree in PTB format.
List<Tree<String>>	readCorpus(InputStream is) Reads a whole corpus of PTB trees and returns the trees as a list.

Methods inherited from class de.up.ling.irtg.codec.InputCodec

addOptions, getAllInputCodecs, getInputCodecByExtension, getInputCodecByName, getInputCodecByNameOrExtension, getInputCodecs, getMetadata, getOption, hasTrueOption, main, read, setOption, setProgressListener

Methods inherited from class java.lang.Object

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

Constructor Detail

PtbTreeInputCodec

public PtbTreeInputCodec()

Method Detail

read

public Tree<String> read(InputStream is)
                  throws CodecParseException,
                         IOException

Reads a single tree in PTB format.

Specified by:

read in class InputCodec<Tree<String>>

Parameters:

is -

Returns:

Throws:

CodecParseException

IOException

optionExtraBrackets

public boolean optionExtraBrackets()

readCorpus

public List<Tree<String>> readCorpus(InputStream is)
                              throws CodecParseException,
                                     IOException

Reads a whole corpus of PTB trees and returns the trees as a list. This method assumes that each tree is surrounded by an extra pair of brackets, as in the original Penn Treebank, and strips these away before reading the tree.

Parameters:

is -

Returns:

Throws:

CodecParseException

IOException