grammarscope.io.read.TreeReader Class Reference

Collaboration diagram for grammarscope.io.read.TreeReader:

Public Member Functions
	TreeReader (final StringReader stringReader)
AParseTree	readTree () throws IOException

Static Public Member Functions
static AParseTree	make (final String inputString)
static void	main (final String[] args)

Private Member Functions
AParseTree	getTreeFromInputStream ()

Private Attributes
final Tokenizer< String >	tokenizer
final TreeNormalizer	treeNormalizer
MutableAParseTree	currentTree
ArrayList< MutableAParseTree >	stack

Static Private Attributes
static final String	leftParen = "("
static final String	rightParen = ")"

Detailed Description

This class implements the TreeReader interface to read Penn Treebank-style files. The reader is implemented as a pushdown automaton (PDA) that parses the Lisp-style format in which the trees are stored. This reader is compatible with both PTB and PATB trees.

Author

Christopher Manning

Roger Levy

Spence Green

Bernard Bou for adaptation

Constructor & Destructor Documentation

TreeReader()

grammarscope.io.read.TreeReader.TreeReader

(

final StringReader

stringReader

)

Constructor

Parameters

stringReader

string reader

Member Function Documentation

getTreeFromInputStream()

AParseTree grammarscope.io.read.TreeReader.getTreeFromInputStream ( )

private

main()

static void grammarscope.io.read.TreeReader.main ( final String[]  args )

static

make()

static AParseTree grammarscope.io.read.TreeReader.make ( final String  inputString )

static

This gives you a tree from a String representation (as a bracketed Tree, of the kind produced by toString(), pennPrint(), or as in the Penn Treebank. It's not the most efficient thing to do for heavy duty usage.

Parameters

inputString

input string

Returns

parse tree artifact

readTree()

AParseTree grammarscope.io.read.TreeReader.readTree

(

)

throws IOException

Reads a single tree in standard Penn Treebank format from the input stream. The method supports additional parentheses around the tree (an unnamed ROOT node) so long as they are balanced. If the token stream ends before the current tree is complete, then the method will throw an IOException.

Note that the method will skip malformed trees and attempt to read additional trees from the input stream. It is possible, however, that a malformed tree will corrupt the token stream. In this case, an IOException will eventually be thrown.

Returns

A single tree, or null at end of token stream.

Exceptions

IOException

exception

Member Data Documentation

currentTree

MutableAParseTree grammarscope.io.read.TreeReader.currentTree

private

leftParen

final String grammarscope.io.read.TreeReader.leftParen = "("

staticprivate

rightParen

final String grammarscope.io.read.TreeReader.rightParen = ")"

staticprivate

stack

ArrayList<MutableAParseTree> grammarscope.io.read.TreeReader.stack

private

tokenizer

final Tokenizer<String> grammarscope.io.read.TreeReader.tokenizer

private

treeNormalizer

final TreeNormalizer grammarscope.io.read.TreeReader.treeNormalizer

private

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The documentation for this class was generated from the following file:

• grammarscope/library/src/main/java/grammarscope/io/read/TreeReader.java