Package com.singularsys.jep.configurableparser.matchers

Interface GrammarMatcher

All Superinterfaces:
Serializable
All Known Implementing Classes:
ArrayAccessGrammarMatcher, BracketedSequenceGrammarMatcher, FunctionGrammarMatcher, FunctionSequenceGrammarMatcher, ListGrammarMatcher, ListOrBracketGrammarMatcher, OperatorAsFunctionGrammarMatcher, RoundBracketGrammarMatcher, SingleArgFunctionMatcher
public interface GrammarMatcher extends 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

    Modifier and Type
    Method
    Description
    void
    init(Jep jep)
    Delayed initialisation, this method 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 Details

    • 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 method is called whenever components of the jep instance are changed.
      Parameters:
      jep - the current jep instance.