Package net.sf.tweety.action.description.parser

Class CLawParser

java.lang.Object

net.sf.tweety.commons.Parser<CActionDescription,net.sf.tweety.commons.Formula>

net.sf.tweety.action.description.parser.CLawParser

public class CLawParser
extends net.sf.tweety.commons.Parser<CActionDescription,net.sf.tweety.commons.Formula>

This class implements a parser for causal laws in C. The BNF of such rules is given by: (starting symbol is DESC)

DESC ::== LAW ("\n" LAW)*
LAW ::== STATICLAW | DYNAMICLAW
STATICLAW ::== "caused" FOLFORMULA ("if" FOLFORMULA)? ("requires" REQUIREMENTS)?
DYNAMICLAW ::== "caused" FOLFORMULA ("if" FOLFORMULA)? "after" FOLFORMULA ("requires" REQUIREMENTS)?
REQUIREMENTS ::== REQUIREMENT ("," REQUIREMENT)*
REQUIREMENT ::== (VARIABLENAME "<>" VARIABLENAME | VARIABLENAME "<>" CONSTANTNAME)*
where FOLFORMULA 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

Field Summary

Fields

Modifier and Type	Field	Description
protected ActionSignature	signature

Constructor Summary

Constructors

Constructor	Description
CLawParser(ActionSignature signature)	This parser needs a valid action signature to parse causal laws.

Method Summary

Modifier and Type	Method	Description
protected Set<String>	containedKeywords(String s)	Returns the set of forbidden keywords, that are contained in a string.
CActionDescription	parseBeliefBase(Reader reader)
protected net.sf.tweety.logics.fol.syntax.FolFormula	parseFolFormula(String s)	Parses a FolFormula from a string using the FolParser class
net.sf.tweety.commons.Formula	parseFormula(Reader reader)
net.sf.tweety.commons.Formula	parseFormula(String s)

Methods inherited from class net.sf.tweety.commons.Parser

isNumeric, parseBeliefBase, parseBeliefBaseFromFile, parseFormulaFromFile

Methods inherited from class java.lang.Object

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

Field Detail

signature

protected ActionSignature signature

Constructor Detail

CLawParser

public CLawParser(ActionSignature signature)

This parser needs a valid action signature to parse causal laws.

Parameters:

signature - some signature

Method Detail

parseBeliefBase

public CActionDescription parseBeliefBase(Reader reader)
                                   throws net.sf.tweety.commons.ParserException

Specified by:

parseBeliefBase in class net.sf.tweety.commons.Parser<CActionDescription,net.sf.tweety.commons.Formula>

Throws:

net.sf.tweety.commons.ParserException

parseFormula

public net.sf.tweety.commons.Formula parseFormula(Reader reader)
                                           throws IOException,
                                                  net.sf.tweety.commons.ParserException

Specified by:

parseFormula in class net.sf.tweety.commons.Parser<CActionDescription,net.sf.tweety.commons.Formula>

Throws:

IOException

net.sf.tweety.commons.ParserException

parseFolFormula

protected net.sf.tweety.logics.fol.syntax.FolFormula parseFolFormula(String s)
                                                              throws net.sf.tweety.commons.ParserException,
                                                                     IOException

Parses a FolFormula from a string using the FolParser class

Parameters:

s - a string

Returns:

A first order formula

Throws:

net.sf.tweety.commons.ParserException - if parsing fails

IOException - if an IO issue occurs.

parseFormula

public net.sf.tweety.commons.Formula parseFormula(String s)
                                           throws net.sf.tweety.commons.ParserException,
                                                  IOException

Overrides:

parseFormula in class net.sf.tweety.commons.Parser<CActionDescription,net.sf.tweety.commons.Formula>

Throws:

net.sf.tweety.commons.ParserException

IOException

containedKeywords

protected Set<String> containedKeywords(String s)

Returns the set of forbidden keywords, that are contained in a string. This is used for error recognition in input strings.

Parameters:

s - some string

Returns:

the set of forbidden keywords