Package com.singularsys.extensions.structure

Class JavaWhileRule

java.lang.Object

com.singularsys.extensions.structure.JavaWhileRule

All Implemented Interfaces:

GrammaticalRuleI, GrammarMatcher, Serializable

public class JavaWhileRule
extends Object
implements GrammaticalRuleI

Parse a Java-style while loop while(x<10) x=x+1;

 <JavaWhileRule> ::=
         <while> <open> <expression> <close> <statement>
 

A successful parse will return a LoopNode.

See Also:

• Serialized Form

Constructor Summary

Constructors

Constructor	Description
JavaWhileRule(SymbolToken whileToken, SymbolToken open, GrammaticalRuleI expression, SymbolToken close, GrammaticalRuleI statement)

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)	Attempt to parse the input using the rule

Methods inherited from class java.lang.Object

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

Constructor Details

JavaWhileRule

public JavaWhileRule(SymbolToken whileToken,
 SymbolToken open,
 GrammaticalRuleI expression,
 SymbolToken close,
 GrammaticalRuleI statement)

Parameters:

whileToken - token for the while symbol

open - opening bracket

expression - rule to parse an expression

close - closing bracket

statement - rule to parse a statement

Method Details

match

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

Description copied from interface: GrammaticalRuleI

Attempt to parse the input using the rule

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 method is called whenever components of the jep instance are changed.

Specified by:

init in interface GrammarMatcher

Parameters:

jep - the current jep instance.