com.singularsys.jep.configurableparser.matchers
Class FunctionGrammarMatcher

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

All Implemented Interfaces:

GrammarMatcher, java.io.Serializable

public class FunctionGrammarMatcher
extends java.lang.Object
implements GrammarMatcher

A GrammarMatcher which matches functions in the form 'atan2(y,x)'. The function must be in the FunctionTable and brackets are required.

See Also:

Serialized Form

Constructor Summary

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

Method Summary

void	init(Jep jep) Delayed initialization, this methods is called whenever components of the jep instance are changed.
Node	match(Lookahead2Iterator<Token> it, GrammarParser parser) Attempt to match a function, calls the GrammarParser.parseSubExpression() to match function arguments.

Methods inherited from class java.lang.Object

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

Constructor Detail

FunctionGrammarMatcher

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

Create a FunctionGrammarMatcher

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 initialization, 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 JepException

Attempt to match a function, calls the GrammarParser.parseSubExpression() to match function arguments.

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.

JepException