Examples of org.drools.compiler.DrlParser

org.drools.compiler.DrlParser
This is a low level parser API. This will return textual AST representations of the DRL source, including with DSL expanders if appropriate.

    private RuleBase loadRuleBase( final Reader reader,
                                   final RuleBaseConfiguration conf ) throws IOException,
                                                                     DroolsParserException,
                                                                     Exception {
        final PackageBuilder builder = new PackageBuilder();
        final DrlParser parser = new DrlParser();
        final PackageDescr packageDescr = parser.parse( reader );
        if ( parser.hasErrors() ) {
            System.out.println( parser.getErrors() );
            fail( parser.getErrors().toString() );
        }
        // pre build the package
        builder.addPackage( packageDescr );
        final Package pkg = builder.getPackage();

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    }


    private RuleBase loadRuleBase(final Reader reader) throws IOException,
        DroolsParserException,
        Exception {
        final DrlParser parser = new DrlParser();
        final PackageDescr packageDescr = parser.parse( reader );
        if ( parser.hasErrors() ) {
            System.out.println( parser.getErrors() );
            fail( "Error messages in parser, need to sort this our (or else collect error messages)" );
        }
        // pre build the package
        final PackageBuilder builder = new PackageBuilder();
        builder.addPackage( packageDescr );

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public class ConsequenceOffsetTest {
    
    @Test
    public void testConsequenceOffset() throws Exception {
        int offset = -1;
        DrlParser parser = new DrlParser();
        Reader reader = new InputStreamReader( ConsequenceOffsetTest.class.getResourceAsStream( "test_consequenceOffset.drl" ) );
        
        PackageDescr packageDescr = parser.parse(reader);
        PackageBuilder packageBuilder = new PackageBuilder();
        packageBuilder.addPackage(packageDescr);
        assertEquals(false, packageBuilder.hasErrors());
        for (Object o: packageDescr.getRules()) {
            RuleDescr rule = (RuleDescr) o;
            if (rule.getName().equals("test")) {
                offset = rule.getConsequenceOffset();
            }
        }
        
        reader = new InputStreamReader( ConsequenceOffsetTest.class.getResourceAsStream( "test_consequenceOffset2.drl" ) );
        packageDescr = parser.parse(reader);
        packageBuilder = new PackageBuilder();
        packageBuilder.addPackage(packageDescr);
        reader = new InputStreamReader( ConsequenceOffsetTest.class.getResourceAsStream( "test_consequenceOffset.drl" ) );
        packageDescr = parser.parse(reader);
        packageBuilder.addPackage(packageDescr);
        assertEquals(false, packageBuilder.hasErrors());
        for (Object o: packageDescr.getRules()) {
            RuleDescr rule = (RuleDescr) o;
            if (rule.getName().equals("test")) {

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    }
    
    @Test
    public void testLargeSetOfImports() throws Exception {
        Reader reader = new InputStreamReader( ConsequenceOffsetTest.class.getResourceAsStream( "test_consequenceOffsetImports.drl" ) );
        DrlParser parser = new DrlParser();
        PackageDescr packageDescr = parser.parse(reader);
        PackageBuilder packageBuilder = new PackageBuilder();
        packageBuilder.addPackage(packageDescr);
        assertEquals(false, packageBuilder.hasErrors());
    }

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    }


    private RuleBase loadRuleBase( final Reader reader ) throws IOException,
                                                        DroolsParserException,
                                                        Exception {
        final DrlParser parser = new DrlParser();
        final PackageDescr packageDescr = parser.parse( reader );
        if ( parser.hasErrors() ) {
            fail( "Error messages in parser, need to sort this our (or else collect error messages)" );
        }
        // pre build the package
        final PackageBuilder builder = new PackageBuilder();
        builder.addPackage( packageDescr );

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    }


    private void typesForOthers(List<String> res,
                                AssetItem asset) {
        // its delcared model
        DrlParser parser = new DrlParser();
        try {
            PackageDescr desc = parser.parse( asset.getContent() );
            List<TypeDeclarationDescr> types = desc.getTypeDeclarations();
            for (TypeDeclarationDescr typeDeclarationDescr : types) {
                res.add( typeDeclarationDescr.getTypeName() );
            }
        } catch (DroolsParserException e) {

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    List<FactMetaModel> toModel(String drl) throws DroolsParserException {
        if ( drl != null && drl.startsWith( "#advanced" ) ) {
            throw new DroolsParserException( "Using advanced editor" );
        }
        DrlParser parser = new DrlParser();
        PackageDescr pkg = parser.parse( drl );
        if ( parser.hasErrors() ) {
            throw new DroolsParserException( "The model drl " + drl + " is not valid" );
        }


        if ( pkg == null ) return new ArrayList<FactMetaModel>();
        List<TypeDeclarationDescr> types = pkg.getTypeDeclarations();

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                        packageDescr = cachedDrlInfo.getPackageDescr();
                        parserErrors = cachedDrlInfo.getParserErrors();
                    }
                }


                DrlParser parser = new DrlParser();
                if ( packageDescr == null ) {
                    Reader dslReader = DSLAdapter.getDSLContent( content, resource );
                    if ( dslReader != null ) {
                        packageDescr = parser.parse( true, content, dslReader );
                    } else {
                        packageDescr = parser.parse( true, content );
                    }
                    parserErrors = parser.getErrors();
                }
                PackageBuilder builder = new PackageBuilder( builder_configuration );
                DRLInfo result = null;
                // compile parsed rules if necessary
                if ( packageDescr != null && compile && !parser.hasErrors()) {
                    // check whether a .package file exists and add it
                    if ( resource != null && resource.getParent() != null ) {
                        MyResourceVisitor visitor = new MyResourceVisitor();
                        resource.getParent().accept( visitor,
                                                     IResource.DEPTH_ONE,
                                                     IResource.NONE );
                        IResource packageDef = visitor.getPackageDef();
                        if ( packageDef != null ) {
                            PackageDescr desc = parseResource( packageDef,
                                                               false ).getPackageDescr();
                            if (desc != null){
                                builder.addPackage( desc);
                            }
                        }
                    }


                    builder.addPackage( packageDescr );
                                        
                    // make sure the namespace is set, use default if necessary, as this is used to build the DRLInfo
                    if ( StringUtils.isEmpty( packageDescr.getNamespace() ) ) {
                        packageDescr.setNamespace( builder.getPackageBuilderConfiguration().getDefaultPackageName() );
                    }
                    
                    result = new DRLInfo( resource == null ? "" : resource.getProjectRelativePath().toString(),
                                          packageDescr,
                                          parserErrors,
                                          builder.getPackageRegistry(packageDescr.getNamespace()).getPackage(),
                                          builder.getErrors().getErrors(),                                          
                                          builder.getPackageRegistry( packageDescr.getNamespace() ).getDialectCompiletimeRegistry() );
                } else {
                    result = new DRLInfo( resource == null ? "" : resource.getProjectRelativePath().toString(),
                                          packageDescr,
                                          parserErrors,
                                          new PackageRegistry(builder, new Package("")).getDialectCompiletimeRegistry() );
                }


                // cache result
                if ( useCache && resource != null) {
                    if ( compile && !parser.hasErrors() ) {
                        parsedRules.remove( resource );
                        compiledRules.put( resource,
                                           result );
                        RuleInfo[] ruleInfos = result.getRuleInfos();
                        for ( int i = 0; i < ruleInfos.length; i++ ) {

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    }


    private void typesForOthers(List<String> res,
            AssetItem asset) {
        // its delcared model
        DrlParser parser = new DrlParser();
        try {
            PackageDescr desc = parser.parse(asset.getContent());
            List<TypeDeclarationDescr> types = desc.getTypeDeclarations();
            for (TypeDeclarationDescr typeDeclarationDescr : types) {
                res.add(typeDeclarationDescr.getTypeName());
            }
        } catch (DroolsParserException e) {

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                System.out.println(drl);


                builder.addPackageFromDrl(new StringReader(drl));


            } else if (fileName.endsWith(DroolsCompilerAntTask.DSLFILEEXTENSION)) {
        DrlParser parser = new DrlParser();
        String expandedDRL = parser.getExpandedDRL(
            loadResource(fileName), resolveDSLFiles());
        builder.addPackageFromDrl(new StringReader(expandedDRL));
      } else {
        builder.addPackageFromDrl(instream);
      }

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