danbikel.parser
Class Collins

java.lang.Object
  danbikel.parser.Collins

All Implemented Interfaces:

NonterminalMapper

public class Collins
extends Object
implements NonterminalMapper

Provides a nonterminal mapping scheme that, when applied to previously-generated modifiers, allows for emulation of Michael Collins' modifier-generation model.

N.B.: The mapPrevMod(Symbol) static method has been deprecated. Classes should use the more flexible mechanism provided by the NTMapper class.

See Also:

map(Symbol), NTMapper, Settings.prevModMapperClass

Field Summary

static Symbol	conjSym The conjunction equivalence class.
static Symbol	miscSym The miscellaneous equivalence class.
static Symbol	puncSym The punctuation equivalence class.
static Symbol	startSym The start symbol equivalence class.

Constructor Summary

Collins()

Method Summary

Symbol	map(Symbol nonterminal) Maps the specified nonterminal to one of four equivalence classes.
static Symbol	mapPrevMod(Symbol prevMod) Deprecated. Classes should now use NTMapper.map(Symbol), since the NTMapper class provides the flexibility of using an internal NonterminalMapper instance created at run-time according to the Settings.prevModMapperClass setting.

Methods inherited from class java.lang.Object

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

Field Detail

startSym

public static final Symbol startSym

The start symbol equivalence class.

conjSym

public static final Symbol conjSym

The conjunction equivalence class.

puncSym

public static final Symbol puncSym

The punctuation equivalence class.

miscSym

public static final Symbol miscSym

The miscellaneous equivalence class.

Constructor Detail

Collins

public Collins()

Method Detail

mapPrevMod

public static Symbol mapPrevMod(Symbol prevMod)

Deprecated. Classes should now use NTMapper.map(Symbol), since the NTMapper class provides the flexibility of using an internal NonterminalMapper instance created at run-time according to the Settings.prevModMapperClass setting.

Maps the specified previous modifier to one of four equivalence classes.

Parameters:

prevMod - the previous modifier to be mapped

Returns:

a mapped version of the specified previous modifier

See Also:

NTMapper, NonterminalMapper, Settings.prevModMapperClass

map

public Symbol map(Symbol nonterminal)

Maps the specified nonterminal to one of four equivalence classes. The mapping is determined by the following sequence of cases:

map(nonterminal) =	startSym	if nonterminal == Language.training().startSym()
	conjSym	if Language.treebank().isConjunction(nonterminal)
	puncSym	if Language.treebank().isPunctuation(nonterminal)
	miscSym	otherwise

Specified by:

map in interface NonterminalMapper

Parameters:

nonterminal - the nonterminal to be mapped

Returns:

the specified nonterminal mapped to one of four possible equivalence classes

See Also:

Training.startSym(), Treebank.isConjunction(Symbol), Treebank.isPunctuation(Symbol)