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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        assertNotNull( result );
    }


    public static void DrlFile(String filename) throws Exception {


        DrlParser parser = new DrlParser();
        final PackageDescr pkgOriginal = parser.parse( new InputStreamReader( DumperTestHelper.class.getResourceAsStream( filename ) ) );
        final DrlDumper dumper = new DrlDumper();
        String result = dumper.dump( pkgOriginal );


        parser = new DrlParser();
        String buffer = readFile( filename );
        assertEqualsIgnoreWhitespace( buffer.toString(),
                                      result );                 
    }

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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() ) {
            Assert.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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        workingMemory.halt();
    }


    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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    for (String f : files) {
      Reader source = new InputStreamReader( 
          CreateMissingElementsWithDrools.class.getResourceAsStream( f ) );
      
      DrlParser parser = new DrlParser();
      try {
        PackageDescr pkg2 = parser.parse( source );
        
        String out = new XmlDumper().dump(pkg2);
        
        result.put(f, out);
      } catch (DroolsParserException e) {

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                      packageName );
    }


    public void testEmptyPackage() 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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        assertEqualsIgnoreWhitespace( "if (speed > speedLimit ? true : false;) pullEmOver();",
                                      (String) rule.getConsequence() );
    }


    public void FIXME_testLatinChars() throws Exception {
        final DrlParser parser = new DrlParser();
        final Reader drl = new InputStreamReader( this.getClass().getResourceAsStream( "latin-sample.dslr" ) );
        final Reader dsl = new InputStreamReader( this.getClass().getResourceAsStream( "latin.dsl" ) );


        final PackageDescr pkg = parser.parse( drl,
                                               dsl );


        // MN: will get some errors due to the char encoding on my FC5 install
        // others who use the right encoding may not see this, feel free to
        // uncomment
        // the following assertion.
        assertFalse( parser.hasErrors() );


        assertEquals( "br.com.auster.drools.sample",
                      pkg.getName() );
        assertEquals( 1,
                      pkg.getRules().size() );

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        assertEquals( "Cheese",
                      first.getObjectType() );
    }


    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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        assertNotNull( (String) rule.getConsequence() );


    }


    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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        assertNotNull( (String) rule.getConsequence() );


    }


    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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Related Classes of org.drools.compiler.DrlParser

org.antlr.runtime.ANTLRInputStream

org.antlr.runtime.ANTLRReaderStream

org.antlr.runtime.ANTLRStringStream

org.antlr.runtime.CommonTokenStream

org.antlr.runtime.tree.CommonTreeNodeStream

org.drools.analytics.AnalyticsTestStandalone

org.drools.analytics.TestBase

org.drools.benchmark.benchmarks.WaltzBenchmark

org.drools.CommonTestMethodBase

org.drools.compiler.xml.rules.DumperTestHelper

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