Package org.tweetyproject.action.query.parser

Class ActionQueryParser

java.lang.Object

org.tweetyproject.commons.Parser<SActionQuerySet,SActionQuery>

org.tweetyproject.action.query.parser.ActionQueryParser

public class ActionQueryParser
extends Parser<SActionQuerySet,SActionQuery>

This class implements a parser for action queries in S. The BNF of such queries is given by: (starting symbol is KB)
KB ::== QUERY1 ("\n" QUERY1)*
QUERY1 ::== QUERY ( "requires" REQUIREMENTS )?
QUERY ::== PROPOSITION | QUERY "&&" QUERY | QUERY "||" QUERY | "!" QUERY | "(" QUERY ")" | "+" | "-"
PROPOSITION ::== HOLDSQUERY | ALWAYSQUERY | NECESSARILYQUERY
HOLDSQUERY ::== "holds" "[" STATEFORMULA "]"
ALWAYSQUERY ::== "always" "[" STATEFORMULA "]"
NECESSARILYQUERY ::== "necessarily" "[" STATEFORMULA "]" "after" ACTIONS
ACTIONS ::== ACTION ( ";" ACTION )*
ACTION ::== "{" ACTIONNAME ("," ACTIONNAME)* "}"
REQUIREMENTS ::== REQUIREMENT ("," REQUIREMENT)*
REQUIREMENT ::== (VARIABLENAME "<>" VARIABLENAME | VARIABLENAME "<>" CONSTANTNAME)*

where STATEFORMULA is an unquantified first-order formula without functors,
and VARIABLENAME, CONSTANTNAME are sequences of symbols
from {a,...,z,A,...,Z,0,...,9} with a letter at the beginning.

Author:

Sebastian Homann, Tim Janus (change constant LogicalSymbols to dynamic)

Constructor Summary

Constructors

Constructor	Description
ActionQueryParser(ActionSignature signature)

Method Summary

Modifier and Type	Method	Description
SActionQuerySet	parseBeliefBase(Reader reader)	Parses the given reader into a belief base of the given type.
SActionQuery	parseFormula(Reader reader)	Parses the given reader into a formula of the given type.

Methods inherited from class org.tweetyproject.commons.Parser

isNumeric, parseBeliefBase, parseBeliefBaseFromFile, parseFormula, parseFormulaFromFile, parseListOfBeliefBases, parseListOfBeliefBases, parseListOfBeliefBasesFromFile, parseListOfBeliefBasesFromFile

Methods inherited from class java.lang.Object

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

Constructor Details

ActionQueryParser

public ActionQueryParser(ActionSignature signature)

Method Details

parseBeliefBase

public SActionQuerySet parseBeliefBase(Reader reader)

Description copied from class: Parser

Parses the given reader into a belief base of the given type.

Specified by:

parseBeliefBase in class Parser<SActionQuerySet,SActionQuery>

Parameters:

reader - a reader

Returns:

a belief base

parseFormula

public SActionQuery parseFormula(Reader reader)
                          throws IOException,
ParserException

Description copied from class: Parser

Parses the given reader into a formula of the given type.

Specified by:

parseFormula in class Parser<SActionQuerySet,SActionQuery>

Parameters:

reader - a reader

Returns:

a formula

Throws:

IOException - if some IO issue occurred.

ParserException - some parsing exceptions may be added here.