com.singularsys.extensions.structure

Class BlockRule

java.lang.Object

com.singularsys.extensions.structure.BlockRule

All Implemented Interfaces:

GrammaticalRuleI, GrammarMatcher, java.io.Serializable

public class BlockRule
extends java.lang.Object
implements GrammaticalRuleI

Parse a statement block { sequence }. Equivalent to the production

 BlockRule ::=
        open statement close
 

Author:

Richard Morris

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
BlockRule(SymbolToken open, SequenceRule statement, SymbolToken close)

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

BlockRule

public BlockRule(SymbolToken open,
                 SequenceRule statement,
                 SymbolToken close)

Parameters:

open - opening bracket

statement - rule to parse

close - closing bracket

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.