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.

        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 this;
        }
    }


    private RuleDescr parseDrl( final ExpandedDRLInfo expandedDRLInfo ) {
        DrlParser drlParser = new DrlParser();
        PackageDescr packageDescr;
        try {
            packageDescr = drlParser.parse( true, expandedDRLInfo.plainDrl );
        } catch ( DroolsParserException e ) {
            throw new RuntimeException( e );
        }
        expandedDRLInfo.registerGlobalDescrs( packageDescr.getGlobals() );
        return packageDescr.getRules().get( 0 );

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    public void testMVELDebugSymbols() throws DroolsParserException {


        MVELDebugHandler.setDebugMode( true );


        try {
            final DrlParser parser = new DrlParser(LanguageLevelOption.DRL5);
            final PackageDescr pkgDescr = parser.parse( new InputStreamReader( getClass().getResourceAsStream( "mvel_rule.drl" ) ) );


            // just checking there is no parsing errors
            assertFalse( parser.getErrors().toString(),
                                parser.hasErrors() );


            InternalKnowledgePackage pkg = new KnowledgePackageImpl( "org.drools" );


            final RuleDescr ruleDescr = pkgDescr.getRules().get( 0 );

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    @Test
    public void testEvalConstraintWithMvelOperator( ) {
        String drl = "rule \"yeah\" " + "\tdialect \"mvel\"\n when "
                     + "Foo( eval( field soundslike \"water\" ) )" + " then " + "end";
        DrlParser drlParser = new DrlParser();
        PackageDescr packageDescr;
        try {
            packageDescr = drlParser.parse( true, drl);
        } catch ( DroolsParserException e ) {
            throw new RuntimeException( e );
        }
        RuleDescr r = packageDescr.getRules().get( 0 );
        PatternDescr pd = (PatternDescr) r.getLhs().getDescrs().get( 0 );

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    @Test
    public void testEvalConstraintWithMvelOperator( ) {
        String drl = "rule \"yeah\" " + "\tdialect \"mvel\"\n when "
                     + "Foo( eval( field soundslike \"water\" ) )" + " then " + "end";
        DrlParser drlParser = new DrlParser();
        PackageDescr packageDescr;
        try {
            packageDescr = drlParser.parse( true, drl);
        } catch ( DroolsParserException e ) {
            throw new RuntimeException( e );
        }
        RuleDescr r = packageDescr.getRules().get( 0 );
        PatternDescr pd = (PatternDescr) r.getLhs().getDescrs().get( 0 );

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            return this;
        }
    }


    private RuleDescr parseDrl( ExpandedDRLInfo expandedDRLInfo ) {
        DrlParser drlParser = new DrlParser();
        PackageDescr packageDescr = null;
        try {
            packageDescr = drlParser.parse( true, expandedDRLInfo.plainDrl );
        } catch ( DroolsParserException e ) {
            throw new RuntimeException( e );
        }
        expandedDRLInfo.registerGlobalDescrs( packageDescr.getGlobals() );
        return packageDescr.getRules().get( 0 );

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org.drools.compiler.builder.impl.KnowledgeBuilderImpl

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org.drools.compiler.integrationtests.LargeRuleBase

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