Package com.singularsys.jep.configurableparser.matchers

Class FunctionGrammarMatcher

java.lang.Object

com.singularsys.jep.configurableparser.matchers.FunctionGrammarMatcher

All Implemented Interfaces:

GrammarMatcher, Serializable

public class FunctionGrammarMatcher
extends 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

Constructors

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

Method Summary

Modifier and Type	Method	Description
protected Token	errorToken(Lookahead2Iterator<Token> it)	Generate a token to use in GrammarExceptions
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)	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 Details

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 Details

init

public void init(Jep jep)

Description copied from interface: GrammarMatcher

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

Specified by:

init in interface GrammarMatcher

Parameters:

jep - the current jep instance.

errorToken

protected Token errorToken(Lookahead2Iterator<Token> it)

Generate a token to use in GrammarExceptions

Parameters:

it - used to get current position

Returns:

a TerminatorToken

match

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

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.