com.singularsys.extensions.structure

Class StatementRule

java.lang.Object

com.singularsys.extensions.structure.StatementRule

All Implemented Interfaces:

GrammaticalRuleI, GrammarMatcher, java.io.Serializable

public class StatementRule
extends java.lang.Object
implements GrammaticalRuleI

Parse a single statement from a list of possibilities.

 <StatementRule> ::=
        | <expression1>
        | <JavaWhileRule2>
  | ....
 

Returns the result of the first successful statement parsed.

Author:

Richard Morris

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
StatementRule()

Method Summary

Modifier and Type	Method and Description
boolean	addRule(GrammaticalRuleI rule) Adds a new rule.
java.util.List<GrammaticalRuleI>	getRules() The list of rules
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

StatementRule

public StatementRule()

Method Detail

addRule

public boolean addRule(GrammaticalRuleI rule)

Adds a new rule.

Parameters:

rule - the rule to be added.

Returns:

true

getRules

public java.util.List<GrammaticalRuleI> getRules()

The list of rules

Returns:

the list of rules.

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.