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.

                      ((List) workingMemory.getGlobal( "list" )).get( 5 ) );
    }


    @Test
    public void testFromWithNewConstructor() throws Exception {
        DrlParser parser = new DrlParser();
        PackageDescr descr = parser.parse( new InputStreamReader( getClass().getResourceAsStream( "test_FromWithNewConstructor.drl" ) ) );
        PackageBuilder builder = new PackageBuilder();
        builder.addPackage( descr );
        Package pkg = builder.getPackage();
        pkg.checkValidity();
        pkg = SerializationHelper.serializeObject( pkg );

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


    @Test
    public void testErrorsParser() throws Exception {
        final DrlParser parser = new DrlParser();
        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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    }


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


        if ( parser.hasErrors() ) {
            for ( DroolsError error : parser.getErrors() ) {
                System.err.println( error );
            }
            fail( parser.getErrors().toString() );
        }


        PackageBuilder builder = new PackageBuilder();
        builder.addPackage( pkg );


        RuleBase ruleBase = getRuleBase();
        ruleBase.addPackage( builder.getPackage() );
        ruleBase = SerializationHelper.serializeObject( ruleBase );
        WorkingMemory workingMemory = ruleBase.newStatefulSession();


        List list = new ArrayList();
        workingMemory.setGlobal( "list",
                                 list );


        final Cheese brie = new Cheese( "brie",
                                        12 );
        workingMemory.insert( brie );


        workingMemory.fireAllRules();


        assertEquals( 3,
                      list.size() );
        assertEquals( "3 1",
                      list.get( 0 ) );
        assertEquals( "MAIN",
                      list.get( 1 ) );
        assertEquals( "1 1",
                      list.get( 2 ) );


        final DrlDumper drlDumper = new DrlDumper();
        final String drlResult = drlDumper.dump( pkg );
        builder = new PackageBuilder();
        builder.addPackageFromDrl( new StringReader( drlResult ) );


        if ( builder.hasErrors() ) {
            for ( DroolsError error : builder.getErrors().getErrors() ) {
                System.err.println( error );
            }
            fail( parser.getErrors().toString() );
        }


        ruleBase = getRuleBase();
        ruleBase.addPackage( builder.getPackage() );
        workingMemory = ruleBase.newStatefulSession();


        list = new ArrayList();
        workingMemory.setGlobal( "list",
                                 list );


        workingMemory.insert( brie );


        workingMemory.fireAllRules();


        assertEquals( 3,
                      list.size() );
        assertEquals( "3 1",
                      list.get( 0 ) );
        assertEquals( "MAIN",
                      list.get( 1 ) );
        assertEquals( "1 1",
                      list.get( 2 ) );


        final XmlDumper xmlDumper = new XmlDumper();
        final String xmlResult = xmlDumper.dump( pkg );


        // System.out.println( xmlResult );


        builder = new PackageBuilder();
        builder.addPackageFromXml( new StringReader( xmlResult ) );


        if ( builder.hasErrors() ) {
            for ( DroolsError error : builder.getErrors().getErrors() ) {
                System.err.println( error );
            }
            fail( parser.getErrors().toString() );
        }


        ruleBase = getRuleBase();
        ruleBase.addPackage( builder.getPackage() );
        workingMemory = ruleBase.newStatefulSession();

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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):\n"
                    + parser.getErrors() );
        }
        // pre build the package
        final PackageBuilder builder = new PackageBuilder();
        builder.addPackage( packageDescr );

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    }


    @Test
    public void testPackage() throws Exception {
        final String source = "package foo.bar.baz";
        final DrlParser parser = new DrlParser();
        final PackageDescr pkg = parser.parse( new StringReader( source ) );
        assertFalse( parser.hasErrors() );
        assertEquals( "foo.bar.baz",
                      pkg.getName() );
    }

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    }


    @Test
    public void testPackageWithError() throws Exception {
        final String source = "package 12 foo.bar.baz";
        final DrlParser parser = new DrlParser();
        final PackageDescr pkg = parser.parse( true,
                                               new StringReader( source ) );
        assertTrue( parser.hasErrors() );
        assertEquals( "foo.bar.baz",
                      pkg.getName() );
    }

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    }


    @Test
    public void testPackageWithError2() throws Exception {
        final String source = "package 12 12312 231";
        final DrlParser parser = new DrlParser();
        final PackageDescr pkg = parser.parse( true,
                                               new StringReader( source ) );
        assertTrue( parser.hasErrors() );
        assertEquals( "",
                      pkg.getName() );
    }

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                      first.getObjectType() );
    }


    @Test
    public void testExpanderLineSpread() throws Exception {
        final DrlParser parser = new DrlParser();
        final PackageDescr pkg = parser.parse( this.getReader( "expander_spread_lines.dslr" ),
                                               this.getReader( "complex.dsl" ) );


        assertFalse( parser.getErrors().toString(),
                     parser.hasErrors() );


        final RuleDescr rule = (RuleDescr) pkg.getRules().get( 0 );
        assertEquals( 1,
                      rule.getLhs().getDescrs().size() );

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    }


    @Test
    public void testExpanderMultipleConstraints() throws Exception {
        final DrlParser parser = new DrlParser();
        final PackageDescr pkg = parser.parse( this.getReader( "expander_multiple_constraints.dslr" ),
                                               this.getReader( "multiple_constraints.dsl" ) );


        assertFalse( parser.getErrors().toString(),
                     parser.hasErrors() );


        final RuleDescr rule = (RuleDescr) pkg.getRules().get( 0 );
        assertEquals( 2,
                      rule.getLhs().getDescrs().size() );

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    }


    @Test
    public void testExpanderMultipleConstraintsFlush() throws Exception {
        final DrlParser parser = new DrlParser();
        // this is similar to the other test, but it requires a flush to add the
        // constraints
        final PackageDescr pkg = parser.parse( this.getReader( "expander_multiple_constraints_flush.dslr" ),
                                               this.getReader( "multiple_constraints.dsl" ) );


        assertFalse( parser.getErrors().toString(),
                     parser.hasErrors() );


        final RuleDescr rule = (RuleDescr) pkg.getRules().get( 0 );
        assertEquals( 1,
                      rule.getLhs().getDescrs().size() );

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org.antlr.runtime.ANTLRInputStream

org.antlr.runtime.ANTLRReaderStream

org.antlr.runtime.ANTLRStringStream

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