Examples of org.drools.lang.Expander

org.drools.lang.Expander
Expanders are extension points for expanding expressions in DRL at parse time. This is just-in-time translation, or macro expansion, or whatever you want. The important thing is that it happens at the last possible moment, so any errors in expansion are included in the parsers errors. Just-in-time expansions may include complex pre-compilers, or just macros, and everything in between. Expanders should ideally not make presumptions on any embedded semantic language. For instance, java aware pre processing should be done in drools-java semantic module, not in the parser itself. Expanders should be reusable across semantic languages.

    public PackageDescr parse(boolean isEditor,
                              final String source,
                              final Reader dsl) throws DroolsParserException {
        DefaultExpanderResolver resolver = getDefaultResolver( dsl );


        final Expander expander = resolver.get( "*",
                                                null );
        final String expanded = expander.expand( source );
        if ( expander.hasErrors() ) {
            this.results.addAll( expander.getErrors() );
        }
        return this.parse( isEditor,
                           expanded );
    }

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     *             If unable to expand in any way.
     */
    public String getExpandedDRL(final String source,
                                 final DefaultExpanderResolver resolver) throws DroolsParserException {


        final Expander expander = resolver.get( "*",
                                                null );
        final String expanded = expander.expand( source );
        if ( expander.hasErrors() ) {
            String err = "";
            for ( ExpanderException ex : expander.getErrors() ) {
                err = err + "\n Line:[" + ex.getLine() + "] " + ex.getMessage();


            }
            throw new DroolsParserException( err );
        }

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        DefaultExpanderResolver resolver = new DefaultExpanderResolver(new StringReader(dsl));
        
        
        final DSLMappingFile file = new DSLTokenizedMappingFile();
        if ( file.parseAndLoad( new StringReader(dsl) ) ) {
            final Expander expander = new DefaultExpander();
            expander.addDSLMapping( file.getMapping() );
            resolver.addExpander("*", expander);
        } else {
            throw new RuntimeDroolsException( "Error parsing and loading DSL file." + file.getErrors() );
        }

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            throw new BuildException( "There are no DSL files for this directory:" + this.srcdir.getAbsolutePath() );
        }


        for ( int index = 0; index < children.length; index++ ) {
            if ( file.parseAndLoad( new StringReader( loadResource( children[index] ) ) ) ) {
                final Expander expander = new DefaultExpander();
                expander.addDSLMapping( file.getMapping() );
                resolver.addExpander( "*",
                                      expander );
            } else {
                throw new RuntimeDroolsException( "Error parsing and loading DSL file." + file.getErrors() );
            }

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    @Test
    public void testMultiLineTemplates() throws Exception {
        final Reader source = new InputStreamReader( getClass().getResourceAsStream( "rule_with_expander_multiline.dslr" ) );
        final Reader dsl = new InputStreamReader( getClass().getResourceAsStream( "test_dsl_multiline.dsl" ) );
        Expander ex =  new DefaultExpanderResolver(dsl).get("*", null);
        String r = ex.expand(source);
        assertEquals("when Car(color==\"Red\") then doSomething();", r.trim());
    }

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    @Test
    public void testMultiLineTemplates() throws Exception {
        final Reader source = new InputStreamReader( getClass().getResourceAsStream( "rule_with_expander_multiline.dslr" ) );
        final Reader dsl = new InputStreamReader( getClass().getResourceAsStream( "test_dsl_multiline.dsl" ) );
        Expander ex =  new DefaultExpanderResolver(dsl).get("*", null);
        String r = ex.expand(source);
        assertEquals("when Car(color==\"Red\") then doSomething();", r.trim());
    }

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    @Test
    public void testMultiLineTemplates() throws Exception {
        final Reader source = new InputStreamReader( getClass().getResourceAsStream( "rule_with_expander_multiline.dslr" ) );
        final Reader dsl = new InputStreamReader( getClass().getResourceAsStream( "test_dsl_multiline.dsl" ) );
        Expander ex =  new DefaultExpanderResolver(dsl).get("*", null);
        String r = ex.expand(source);
        assertEquals("when Car(color==\"Red\") then doSomething();", r.trim());
    }

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    public PackageDescr parse(boolean isEditor,
                              final String source,
                              final Reader dsl) throws DroolsParserException {
        DefaultExpanderResolver resolver = getDefaultResolver(dsl);


        final Expander expander = resolver.get( "*", null );
        final String expanded = expander.expand( source );
        if ( expander.hasErrors() ) {
            this.results.addAll( expander.getErrors() );
        }
        return this.parse(isEditor, expanded);
    }

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     *             If unable to expand in any way.
     */
    public String getExpandedDRL(final String source,
                                 final DefaultExpanderResolver resolver) throws DroolsParserException {


        final Expander expander = resolver.get("*",
                null);
        final String expanded = expander.expand( source );
        if ( expander.hasErrors() ) {
            String err = "";
            for ( ExpanderException ex : expander.getErrors() ) {
                err = err + "\n Line:[" + ex.getLine() + "] " + ex.getMessage();


            }
            throw new DroolsParserException( err );
        }

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            resolver = new DefaultExpanderResolver( dsl );
        } catch ( final IOException e ) {
            throw new DroolsParserException( "Error parsing the DSL.",
                                             e );
        }
        final Expander expander = resolver.get( "*",
                                          null );
        final String expanded = expander.expand( source );
        if ( expander.hasErrors() ) {
            this.results.addAll( expander.getErrors() );
        }
        return this.parse( expanded );
    }

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Related Classes of org.drools.lang.Expander

org.drools.compiler.DrlParser

org.drools.compiler.DrlParserTest

org.drools.contrib.DroolsCompilerAntTask

org.drools.integrationtests.DslTest

org.drools.lang.dsl.DefaultExpanderResolver

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