Class FunctionGrammarMatcher
- java.lang.Object
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- com.singularsys.jep.configurableparser.matchers.FunctionGrammarMatcher
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- 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
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Constructor Summary
Constructors Constructor Description FunctionGrammarMatcher(Token open, Token close, Token comma)
Create a FunctionGrammarMatcher
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description protected Token
errorToken(Lookahead2Iterator<Token> it)
Generate a token to use in GrammarExecptionsvoid
init(Jep jep)
Delayed initialisation, 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.
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Method Detail
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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 interfaceGrammarMatcher
- Parameters:
jep
- the current jep instance.
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errorToken
protected Token errorToken(Lookahead2Iterator<Token> it)
Generate a token to use in GrammarExecptions- Parameters:
it
- used to get current position- Returns:
- a TerminatorToken
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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 interfaceGrammarMatcher
- Parameters:
it
- An iterator inspecting the inputparser
- 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.
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