Package org.drools.compiler.lang

Class DRL6Parser

    • Constructor Detail

      • DRL6Parser

        public DRL6Parser​(org.antlr.runtime.TokenStream input)

    • Method Detail

      • packageStatement

        public String packageStatement​(PackageDescrBuilder pkg)
                        throws org.antlr.runtime.RecognitionException
        Parses a package statement and returns the name of the package or null if none is defined. packageStatement := PACKAGE qualifiedIdentifier SEMICOLON?
        Returns:
        the name of the package or null if none is defined
        Throws:
        org.antlr.runtime.RecognitionException

      • unitStatement

        public UnitDescr unitStatement​(PackageDescrBuilder pkg)
                        throws org.antlr.runtime.RecognitionException
        unitStatement := UNIT qualifiedIdentifier SEMICOLON?
        Throws:
        org.antlr.runtime.RecognitionException

      • statement

        public BaseDescr statement​(PackageDescrBuilder pkg)
                    throws org.antlr.runtime.RecognitionException
        statement := importStatement | globalStatement | declare | rule | ruleAttribute | function | query ;
        Throws:
        org.antlr.runtime.RecognitionException

      • importStatement

        public ImportDescr importStatement​(PackageDescrBuilder pkg)
                            throws org.antlr.runtime.RecognitionException
        importStatement := IMPORT ((FUNCTION|STATIC)? qualifiedIdentifier ((DOT STAR)? |(ACC|ACCUMULATE) qualifiedIdentifier ID)
        Returns:
        Throws:
        org.antlr.runtime.RecognitionException

      • globalStatement

        public GlobalDescr globalStatement​(PackageDescrBuilder pkg)
                            throws org.antlr.runtime.RecognitionException
        globalStatement := GLOBAL type ID
        Returns:
        Throws:
        org.antlr.runtime.RecognitionException

      • declare

        public BaseDescr declare​(PackageDescrBuilder pkg)
                  throws org.antlr.runtime.RecognitionException
        declare := DECLARE | (ENTRY-POINT) => entryPointDeclaration | (WINDOW) => windowDeclaration | (TRAIT) => typeDeclaration (trait) | (ENUM) => enumDeclaration | typeDeclaration (class) END
        Returns:
        Throws:
        org.antlr.runtime.RecognitionException

      • entryPointDeclaration

        public EntryPointDeclarationDescr entryPointDeclaration​(DeclareDescrBuilder ddb)
                                                 throws org.antlr.runtime.RecognitionException
        entryPointDeclaration := ENTRY-POINT stringId annotation* END
        Returns:
        Throws:
        org.antlr.runtime.RecognitionException

      • windowDeclaration

        public WindowDeclarationDescr windowDeclaration​(DeclareDescrBuilder ddb)
                                         throws org.antlr.runtime.RecognitionException
        windowDeclaration := WINDOW ID annotation* lhsPatternBind END
        Returns:
        Throws:
        org.antlr.runtime.RecognitionException

      • typeDeclaration

        public TypeDeclarationDescr typeDeclaration​(DeclareDescrBuilder ddb,
                                            boolean isTrait)
                                     throws org.antlr.runtime.RecognitionException
        typeDeclaration := [TYPE] qualifiedIdentifier (EXTENDS qualifiedIdentifier)? annotation* field* END
        Returns:
        Throws:
        org.antlr.runtime.RecognitionException

      • function

        public FunctionDescr function​(PackageDescrBuilder pkg)
                       throws org.antlr.runtime.RecognitionException
        function := FUNCTION type? ID parameters(typed) chunk_{_}
        Returns:
        Throws:
        org.antlr.runtime.RecognitionException

      • query

        public RuleDescr query​(PackageDescrBuilder pkg)
                throws org.antlr.runtime.RecognitionException
        query := QUERY stringId parameters? annotation* lhsExpression END
        Returns:
        Throws:
        org.antlr.runtime.RecognitionException

      • rule

        public RuleDescr rule​(PackageDescrBuilder pkg)
               throws org.antlr.runtime.RecognitionException
        rule := RULE stringId (EXTENDS stringId)? annotation* attributes? lhs? rhs END
        Returns:
        Throws:
        org.antlr.runtime.RecognitionException

      • attribute

        public AttributeDescr attribute​(AttributeSupportBuilder<?> as)
        attribute := salience | enabled | ( NO-LOOP | AUTO-FOCUS | LOCK-ON-ACTIVE | REFRACT | DIRECT ) BOOLEAN? | ( AGENDA-GROUP | ACTIVATION-GROUP | RULEFLOW-GROUP | DATE-EFFECTIVE | DATE-EXPIRES | DIALECT ) STRING | CALENDARS STRING (COMMA STRING)* | TIMER ( DECIMAL | chunk_(_) ) | DURATION ( DECIMAL | chunk_(_) ) The above syntax is not quite how this is parsed, because the soft keyword is determined by look-ahead and passed on to one of the x-Attribute methods (booleanAttribute, stringAttribute, stringListAttribute, intOrChunkAttribute) which will actually gobble the tokens.
        Returns:

      • lhsExists

        protected BaseDescr lhsExists​(CEDescrBuilder<?,​?> ce,
                              boolean allowOr)
                       throws org.antlr.runtime.RecognitionException
        lhsExists := EXISTS ( (LEFT_PAREN (or_key|and_key))=> lhsOr // prevents '((' for prefixed and/or | LEFT_PAREN lhsOr RIGHT_PAREN | lhsPatternBind )
        Parameters:
        ce -
        Returns:
        Throws:
        org.antlr.runtime.RecognitionException

      • lhsNot

        protected BaseDescr lhsNot​(CEDescrBuilder<?,​?> ce,
                           boolean allowOr)
                    throws org.antlr.runtime.RecognitionException
        lhsNot := NOT ( (LEFT_PAREN (or_key|and_key))=> lhsOr // prevents '((' for prefixed and/or | LEFT_PAREN lhsOr RIGHT_PAREN | lhsPatternBind )
        Parameters:
        ce -
        Returns:
        Throws:
        org.antlr.runtime.RecognitionException

      • lhsForall

        protected BaseDescr lhsForall​(CEDescrBuilder<?,​?> ce)
                       throws org.antlr.runtime.RecognitionException
        lhsForall := FORALL LEFT_PAREN lhsPatternBind+ RIGHT_PAREN
        Parameters:
        ce -
        Returns:
        Throws:
        org.antlr.runtime.RecognitionException

      • defaultConsequence

        public void defaultConsequence​(RuleDescrBuilder rule)
        defaultConsequence := THEN chunk
        Parameters:
        rule -

      • namedConsequence

        public void namedConsequence​(RuleDescrBuilder rule)
        namedConsequence := THEN LEFT_SQUARE ID RIGHT_SQUARE chunk
        Parameters:
        rule -

      • getConsequenceCode

        protected String getConsequenceCode​(int first)

      • type

        public String type()
            throws org.antlr.runtime.RecognitionException
        Matches a type name type := ID typeArguments? ( DOT ID typeArguments? )* (LEFT_SQUARE RIGHT_SQUARE)*
        Returns:
        Throws:
        org.antlr.runtime.RecognitionException

      • typeArguments

        public String typeArguments()
                     throws org.antlr.runtime.RecognitionException
        Matches type arguments typeArguments := LESS typeArgument (COMMA typeArgument)* GREATER
        Returns:
        Throws:
        org.antlr.runtime.RecognitionException

      • typeArgument

        public String typeArgument()
                    throws org.antlr.runtime.RecognitionException
        Matches a type argument typeArguments := QUESTION (( EXTENDS | SUPER ) type )? | type ;
        Returns:
        Throws:
        org.antlr.runtime.RecognitionException

      • qualifiedIdentifier

        public String qualifiedIdentifier()
                           throws org.antlr.runtime.RecognitionException
        Matches a qualified identifier qualifiedIdentifier := ID ( DOT ID )*
        Returns:
        Throws:
        org.antlr.runtime.RecognitionException

      • conditionalExpression

        public String conditionalExpression()
                             throws org.antlr.runtime.RecognitionException
        Matches a conditional expression
        Returns:
        Throws:
        org.antlr.runtime.RecognitionException

      • conditionalOrExpression

        public String conditionalOrExpression()
                               throws org.antlr.runtime.RecognitionException
        Matches a conditional || expression
        Returns:
        Throws:
        org.antlr.runtime.RecognitionException

      • chunk

        public String chunk​(int leftDelimiter,
                    int rightDelimiter,
                    int location)
        Matches a chunk started by the leftDelimiter and ended by the rightDelimiter.
        Specified by:
        chunk in interface DRLParser
        Parameters:
        leftDelimiter -
        rightDelimiter -
        location -
        Returns:
        the matched chunk without the delimiters

      • recoverFromMismatchedToken

        protected org.antlr.runtime.Token recoverFromMismatchedToken​(org.antlr.runtime.TokenStream input,
                                                             int ttype,
                                                             String text,
                                                             int[] follow)
                                                      throws org.antlr.runtime.RecognitionException
        Attempt to recover from a single missing or extra token. EXTRA TOKEN LA(1) is not what we are looking for. If LA(2) has the right token, however, then assume LA(1) is some extra spurious token. Delete it and LA(2) as if we were doing a normal match(), which advances the input. MISSING TOKEN If current token is consistent with what could come after ttype then it is ok to "insert" the missing token, else throw exception For example, Input "i=(3;" is clearly missing the ')'. When the parser returns from the nested call to expr, it will have call chain: stat -> expr -> atom and it will be trying to match the ')' at this point in the derivation: => ID '=' '(' INT ')' ('+' atom)* ';' ^ match() will see that ';' doesn't match ')' and report a mismatched token error. To recover, it sees that LA(1)==';' is in the set of tokens that can follow the ')' token reference in rule atom. It can assume that you forgot the ')'.
        Throws:
        org.antlr.runtime.RecognitionException

      • mismatchIsUnwantedToken

        public boolean mismatchIsUnwantedToken​(org.antlr.runtime.TokenStream input,
                                       int ttype,
                                       String text)

      • mismatchIsMissingToken

        public boolean mismatchIsMissingToken​(org.antlr.runtime.TokenStream input,
                                      int[] follow)