com.singularsys.extensions.structure

Class JavaForRule

java.lang.Object

com.singularsys.extensions.structure.JavaForRule

All Implemented Interfaces:

GrammaticalRuleI, GrammarMatcher, java.io.Serializable

public class JavaForRule
extends java.lang.Object
implements GrammaticalRuleI

Parses a java-style for loop for(i=0;i<10;++i) x+=i;.

 <JavaForRule> ::=
   <for> <open> <expression> <sep> <expression> <sep> <expression> <close> <statement>
 

Any of the expressions can be empty Successful parse will return a LoopNode.

Author:

Richard Morris

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
JavaForRule(SymbolToken forToken, SymbolToken open, GrammaticalRuleI expression, SymbolToken sep, SymbolToken close, GrammaticalRuleI statement) Constructor.

Method Summary

Modifier and Type	Method and 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) 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 Detail

JavaForRule

public JavaForRule(SymbolToken forToken,
                   SymbolToken open,
                   GrammaticalRuleI expression,
                   SymbolToken sep,
                   SymbolToken close,
                   GrammaticalRuleI statement)

Constructor.

Parameters:

forToken - token representing "for"

open - opening bracket

expression - rule for parsing an expression

sep - separator between part of statement

close - closing bracket

statement - rule for parsing a statement

Method Detail

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 GrammaticalRuleI

Specified by:

match in interface GrammarMatcher

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.