com.singularsys.jep.configurableparser.matchers
Interface GrammarMatcher

All Superinterfaces:
java.io.Serializable
All Known Implementing Classes:
ArrayAccessGrammarMatcher, FunctionGrammarMatcher, ListGrammarMatcher, ListOrBracketGrammarMatcher, RoundBracketGrammarMatcher

public interface GrammarMatcher
extends java.io.Serializable

Interface defining matchers for custom grammatical elements. GrammarMatchers match syntax elements at the same precedence level as brackets they can examine the next two tokens in the input using the Lookahead2Iterator and call the GrammarParser.parseSubExpression() to parse expression fragments.


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.
 

Method Detail

match

Node match(Lookahead2Iterator<Token> it,
           GrammarParser parser)
           throws ParseException
Test whether the input matches this pattern.

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.

init

void init(Jep jep)
Delayed initialisation, this methods is called whenever components of the jep instance are changed.

Parameters:
jep - the current jep instance.


Copyright © 2010 Singular Systems http://www.singularsys.com/jep