com.singularsys.jep.configurableparser.matchers
Class ListOrBracketGrammarMatcher

java.lang.Object
  com.singularsys.jep.configurableparser.matchers.ListOrBracketGrammarMatcher

All Implemented Interfaces:

GrammarMatcher, java.io.Serializable

public class ListOrBracketGrammarMatcher
extends java.lang.Object
implements GrammarMatcher

A GrammarMatcher which matches overloaded lists of items or brackets. If there is more than one element in the list it will be interpreted as a list, otherwise it will be interpreted as a normal bracketed expression.

See Also:

Serialized Form

Constructor Summary

ListOrBracketGrammarMatcher(Token open, Token close, Token comma)
Create a ListOrBracketGrammarMatcher

Method Summary

void	init(Jep jep) Delayed initialisation, this methods is called whenever components of the jep instance are changed.
Node	match(Lookahead2Iterator<Token> it, GrammarParser parser) Test whether the input matches this pattern.

Methods inherited from class java.lang.Object

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

Constructor Detail

ListOrBracketGrammarMatcher

public ListOrBracketGrammarMatcher(Token open,
                                   Token close,
                                   Token comma)

Create a ListOrBracketGrammarMatcher

Parameters:

open - token representing an opening bracket

close - token representing a closing bracket

comma - token representing a list item separator

Method Detail

init

public void init(Jep jep)

Description copied from interface: GrammarMatcher

Delayed initialisation, this methods is called whenever components of the jep instance are changed.

Specified by:

init in interface GrammarMatcher

Parameters:

jep - the current jep instance.

match

public Node match(Lookahead2Iterator<Token> it,
                  GrammarParser parser)
           throws ParseException

Description copied from interface: GrammarMatcher

Test whether the input matches this pattern.

Specified by:

match in interface GrammarMatcher

Parameters:

it - An iterator inspecting the input

parser - the parser to use when evaluating sub expressions

Returns:

if matched returns a node representing the content, return null is does not match

Throws:

ParseException - if there is a syntactical error in the input.