Package org.petitparser.parser.combinators

Class OptionalParser

java.lang.Object

org.petitparser.parser.Parser

org.petitparser.parser.combinators.DelegateParser

org.petitparser.parser.combinators.OptionalParser

public class OptionalParser
extends DelegateParser

A parser that optionally parsers its delegate, or answers nil.

Field Summary

Fields

Modifier and Type	Field	Description
protected Object	otherwise

Fields inherited from class org.petitparser.parser.combinators.DelegateParser

delegate

Constructor Summary

Constructors

Constructor	Description
OptionalParser(Parser delegate, Object otherwise)

Method Summary

Modifier and Type	Method	Description
OptionalParser	copy()	Returns a shallow copy of the receiver.
protected boolean	hasEqualProperties(Parser other)	Compares the properties of two parsers.
Result	parseOn(Context context)	Primitive method doing the actual parsing.

Methods inherited from class org.petitparser.parser.combinators.DelegateParser

getChildren, replace

Methods inherited from class java.lang.Object

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

Methods inherited from class org.petitparser.parser.Parser

accept, and, callCC, delimitedBy, end, end, flatten, hasEqualChildren, isEqualTo, isEqualTo, map, matches, matchesSkipping, neg, neg, not, not, optional, optional, or, parse, permute, pick, plus, plusGreedy, plusLazy, repeat, repeatGreedy, repeatLazy, separatedBy, seq, settable, star, starGreedy, starLazy, times, token, toString, trim, trim, trim

Field Detail

otherwise

protected final Object otherwise

Constructor Detail

OptionalParser

public OptionalParser(Parser delegate,
                      Object otherwise)

Method Detail

parseOn

public Result parseOn(Context context)

Description copied from class: Parser

Primitive method doing the actual parsing.

Overrides:

parseOn in class DelegateParser

hasEqualProperties

protected boolean hasEqualProperties(Parser other)

Description copied from class: Parser

Compares the properties of two parsers. Override this method in all subclasses that add new state.

Overrides:

hasEqualProperties in class Parser

copy

public OptionalParser copy()

Description copied from class: Parser

Returns a shallow copy of the receiver.

Overrides:

copy in class DelegateParser