Examples of org.drools.compiler.compiler.DrlParser

org.drools.compiler.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.

         assertTrue( rhsError.getLine() >= 8 && rhsError.getLine() <= 17 ); // TODO this should be 16
     }


     @Test
     public void testErrorsParser() throws Exception {
         final DrlParser parser = new DrlParser( LanguageLevelOption.DRL5 );
         assertEquals( 0,
                       parser.getErrors().size() );
         parser.parse( new InputStreamReader( getClass().getResourceAsStream( "errors_parser_multiple.drl" ) ) );
         assertTrue( parser.hasErrors() );
         assertTrue( parser.getErrors().size() > 0 );
         assertTrue( parser.getErrors().get( 0 ) instanceof ParserError);
         final ParserError first = ((ParserError) parser.getErrors().get( 0 ));
         assertTrue( first.getMessage() != null );
         assertFalse( first.getMessage().equals( "" ) );
     }

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         assertTrue( list4.contains( chili1 ) );
     }


     @Test
     public void testDumpers() throws Exception {
         final DrlParser parser = new DrlParser( LanguageLevelOption.DRL5 );
         final PackageDescr pkg = parser.parse( new InputStreamReader( getClass().getResourceAsStream( "test_Dumpers.drl" ) ) );


         if ( parser.hasErrors() ) {
             for ( DroolsError error : parser.getErrors() ) {
                 logger.warn( error.toString() );
             }
             fail( parser.getErrors().toString() );
         }


         KnowledgeBase kbase = SerializationHelper.serializeObject( loadKnowledgeBase( pkg ) );
         StatefulKnowledgeSession ksession = kbase.newStatefulKnowledgeSession();

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     */
    public void addPackageFromDrl(final Reader reader,
                                  final Resource sourceResource) throws DroolsParserException,
                                                                        IOException {
        this.resource = sourceResource;
        final DrlParser parser = new DrlParser(configuration.getLanguageLevel());
        final PackageDescr pkg = parser.parse(sourceResource, reader);
        this.results.addAll(parser.getErrors());
        if (pkg == null) {
            addBuilderResult(new ParserError(sourceResource, "Parser returned a null Package", 0, 0));
        }


        if (!parser.hasErrors()) {
            addPackage(pkg);
        }
        this.resource = null;
    }

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        DecisionTableConfiguration dtableConfiguration = configuration instanceof DecisionTableConfiguration ?
                                                         (DecisionTableConfiguration) configuration :
                                                         null;
        String string = DecisionTableFactory.loadFromInputStream(resource.getInputStream(), dtableConfiguration);


        DrlParser parser = new DrlParser(this.configuration.getLanguageLevel());
        PackageDescr pkg = parser.parse(resource, new StringReader(string));
        this.results.addAll(parser.getErrors());
        if (pkg == null) {
            addBuilderResult(new ParserError(resource, "Parser returned a null Package", 0, 0));
        }
        return parser.hasErrors() ? null : pkg;
    }

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        ScoreCardConfiguration scardConfiguration = configuration instanceof ScoreCardConfiguration ?
                                                    (ScoreCardConfiguration) configuration :
                                                    null;
        String string = ScoreCardFactory.loadFromInputStream(resource.getInputStream(), scardConfiguration);


        DrlParser parser = new DrlParser(this.configuration.getLanguageLevel());
        PackageDescr pkg = parser.parse(resource, new StringReader(string));
        this.results.addAll(parser.getErrors());
        if (pkg == null) {
            addBuilderResult(new ParserError(resource, "Parser returned a null Package", 0, 0));
        }
        return parser.hasErrors() ? null : pkg;
    }

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        PackageDescr pkg;
        boolean hasErrors = false;
        if (resource instanceof DescrResource) {
            pkg = (PackageDescr) ((DescrResource) resource).getDescr();
        } else {
            final DrlParser parser = new DrlParser(configuration.getLanguageLevel());
            pkg = parser.parse(resource);
            this.results.addAll(parser.getErrors());
            if (pkg == null) {
                addBuilderResult(new ParserError(resource, "Parser returned a null Package", 0, 0));
            }
            hasErrors = parser.hasErrors();
        }
        if (pkg != null) {
            pkg.setResource(resource);
        }
        return hasErrors ? null : pkg;

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    public void addPackageFromDrl(final Reader source,
                                  final Reader dsl) throws DroolsParserException,
                                                           IOException {
        this.resource = new ReaderResource(source, ResourceType.DSLR);


        final DrlParser parser = new DrlParser(configuration.getLanguageLevel());
        final PackageDescr pkg = parser.parse(source, dsl);
        this.results.addAll(parser.getErrors());
        if (!parser.hasErrors()) {
            addPackage(pkg);
        }
        this.resource = null;
    }

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    PackageDescr dslrToPackageDescr(Resource resource) throws DroolsParserException {
        boolean hasErrors;
        PackageDescr pkg;


        DrlParser parser = new DrlParser(configuration.getLanguageLevel());
        DefaultExpander expander = getDslExpander();


        Reader reader = null;
        try {
            if (expander == null) {
                expander = new DefaultExpander();
            }
            reader = resource.getReader();
            String str = expander.expand(reader);
            if (expander.hasErrors()) {
                for (ExpanderException error : expander.getErrors()) {
                    error.setResource(resource);
                    addBuilderResult(error);
                }
            }


            pkg = parser.parse(resource, str);
            this.results.addAll(parser.getErrors());
            hasErrors = parser.hasErrors();
        } catch (IOException e) {
            throw new RuntimeException(e);
        } finally {
            if (reader != null) {
                try {

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        if (!compiler.getResults().isEmpty()) {
            this.results.addAll(compiler.getResults());
            return null;
        }


        DrlParser parser = new DrlParser(configuration.getLanguageLevel());
        PackageDescr pkg = parser.parse(resource, new StringReader(theory));
        this.results.addAll(parser.getErrors());
        if (pkg == null) {
            addBuilderResult(new ParserError(resource, "Parser returned a null Package", 0, 0));
            return pkg;
        } else {
            return parser.hasErrors() ? null : pkg;
        }
    }

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    return pkg;
  }


  protected RuleBase loadRuleBase(final Reader reader) throws IOException,
      DroolsParserException, Exception {
    final DrlParser parser = new DrlParser(LanguageLevelOption.DRL5);
    final PackageDescr packageDescr = parser.parse(reader);
    if (parser.hasErrors()) {
      fail("Error messages in parser, need to sort this our (or else collect error messages):\n"
          + parser.getErrors());
    }
    // pre build the package
    final PackageBuilder builder = new PackageBuilder();
    builder.addPackage(packageDescr);

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Related Classes of org.drools.compiler.compiler.DrlParser

org.drools.compiler.builder.impl.KnowledgeBuilderImpl

org.drools.compiler.CommonTestMethodBase

org.drools.compiler.compiler.xml.rules.DumperTestHelper

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org.drools.compiler.integrationtests.LargeRuleBase

org.drools.compiler.integrationtests.LargeRuleBaseSerializationTest

org.drools.compiler.integrationtests.Misc2Test

org.drools.compiler.integrationtests.MiscTest

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