net.sf.tweety.logics.rcl.parser

Class RclParser

java.lang.Object

net.sf.tweety.commons.Parser<RclBeliefSet>

net.sf.tweety.logics.rcl.parser.RclParser

public class RclParser
extends Parser<RclBeliefSet>

This class implements a parser for relational conditional logic. The BNF for a conditional knowledge base is given by (starting symbol is KB)

KB ::== SORTSDEC PREDDECS (CONDITIONAL "\n")*
SORTSDEC ::== ( SORTNAME "=" "{" (CONSTANTNAME ("," CONSTANTNAME)*)? "}" "\n" )*
PREDDECS ::== ( "type" "(" PREDICATENAME "(" (SORTNAME ("," SORTNAME)*)? ")" ")" "\n" )*
CONDITIONAL ::== "(" FORMULA ")" "[" PROB "]" | "(" FORMULA "|" FORMULA ")"
FORMULA ::== ATOM | "(" FORMULA ")" | FORMULA "&&" FORMULA | FORMULA "||" FORMULA | "!" FORMULA | "+" | "-"
ATOM ::== PREDICATENAME "(" (TERM ("," TERM)*)? ")"
TERM ::== VARIABLENAME | CONSTANTNAME

where SORTNAME, PREDICATENAME, CONSTANTNAME, and VARIABLENAME are sequences of
symbols from {a,...,z,A,...,Z,0,...,9} with a letter at the beginning.

Author:

Matthias Thimm

Field Summary

Fields

Modifier and Type	Field and Description
private FolParser	folParser For parsing FOL fragments.

Constructor Summary

Constructors

Constructor and Description
RclParser() Creates a new RCL Parser

Method Summary

Modifier and Type	Method and Description
FolSignature	getSignature() Returns the signature of this parser.
RclBeliefSet	parseBeliefBase(java.io.Reader reader) Parses the given reader into a belief base of the given type.
RelationalConditional	parseFormula(java.io.Reader reader) Parses the given reader into a formula of the given type.

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

isNumeric, parseBeliefBase, parseBeliefBaseFromFile, parseFormula, parseFormulaFromFile

Methods inherited from class java.lang.Object

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

Field Detail

folParser

private FolParser folParser

For parsing FOL fragments.

Constructor Detail

RclParser

public RclParser()

Creates a new RCL Parser

Method Detail

parseBeliefBase

public RclBeliefSet parseBeliefBase(java.io.Reader reader)
                             throws java.io.IOException,
                                    ParserException

Description copied from class: Parser

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

Specified by:

parseBeliefBase in class Parser<RclBeliefSet>

Parameters:

reader - a reader

Returns:

a belief base

Throws:

java.io.IOException

ParserException

parseFormula

public RelationalConditional parseFormula(java.io.Reader reader)
                                   throws java.io.IOException,
                                          ParserException

Description copied from class: Parser

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

Specified by:

parseFormula in class Parser<RclBeliefSet>

Parameters:

reader - a reader

Returns:

a formula

Throws:

java.io.IOException

ParserException

getSignature

public FolSignature getSignature()

Returns the signature of this parser.

Returns:

the signature of this parser.