Package com.singularsys.extensions.structure

Class ExpressionRule

java.lang.Object

com.singularsys.extensions.structure.ExpressionRule

All Implemented Interfaces:

GrammaticalRuleI, GrammarMatcher, java.io.Serializable

public class ExpressionRule
extends java.lang.Object
implements GrammaticalRuleI

Parses an expression. Calls the ShuntingYard.parseSubExpression()

Author:

Richard Morris

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor	Description
ExpressionRule()

Method Summary

Modifier and Type	Method	Description
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)	Calls StructuredGrammarParser.parseSubExpression()

Methods inherited from class java.lang.Object

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

Constructor Detail

ExpressionRule

public ExpressionRule()

Method Detail

match

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

Calls StructuredGrammarParser.parseSubExpression()

Specified by:

match in interface GrammarMatcher

Specified by:

match in interface GrammaticalRuleI

Parameters:

it - iterator with tokens to parse

parser - the parser to parse any components of the rule

Returns:

successful parses should return a Node, null if unsuccessful

Throws:

ParseException - if there is a syntactical error

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 interface GrammarMatcher

Parameters:

jep - the current jep instance.