Xtext antlr options trading


Xtext offers two levels on which you can configure your language: MWE2 Modeling Workflow Engine allows to compose object graphs xtext antlr options trading in a very compact manner. The nice thing xtext antlr options trading it is that it just instantiates Java classes and the configuration is done through public setter and adder methods as known from Java Beans encapsulation principles.

More in-depth information can be found in the MWE2 documentation. One can create a family tree with MWE2 easily by describing it in a declarative manner without writing a single line of Java code and without the need to compile classes:.

These few lines will, when interpreted by MWE2, result in an object tree consisting of three instances of com. The interpreter will basically do the same as the following main method:. And this is how it works: The root element is a plain Java class name.

As this MWE2 module is a sibling to the class com. Person it is not necessary to use fully qualified xtext antlr options trading. The constructed objects are furthermore configured according to the declaration in the module, i.

All three instances will have their respective name assigned via a reflective invocation of the setName method. Another frequently used feature of MWE2 is variableswhich can be declared with var as shown below. Such a variable can be reset from outside when calling the module, e.

Although arbitrary Java classes can be xtext antlr options trading, the xtext antlr options trading root element for MWE2 files is Workflowwhich is part of the very slim runtime model shipped with MWE2. It accepts beans and components. The language generator component itself is an instance of IWorkflowComponent and can therefore be used within MWE2 workflows.

Xtext provides a lot of generic implementations for the infrastructure of your language, but also uses code generation to create specialized components. Such generated components are for instance the parser, the serializer, the inferred Ecore model if any and a couple of convenient base classes for further configuration.

The generator also contributes to shared project resources such as the plugin. MF and the Guice modules. This documentation is about the new generator infrastructure introduced with Xtext 2.

In order to migrate an older Xtext project to this new infrastructure, the recommended approach is to create a new Xtext project and copy the grammar and existing configuration from the old project to the new one step by step. The entry point for Xtext code generation is XtextGeneratorwhich is composed of a general configuration and a set of language configurations. The general configuration describes the structure of your project as well as general settings for generating code.

Each language configuration corresponds to a specific grammar file and allows to configure the generated code for the respective language. The actual code generation is performed by generator fragments contained in a language configuration.

This example is similar to the workflows generated xtext antlr options trading the Xtext project wizard when you create new projects. It uses two convenience classes StandardProjectConfig and StandardLanguageboth of which are designed to apply default configurations that work for the majority of language projects. The Xtext generator needs xtext antlr options trading know the structure of your project in order to generate code into the correct paths. The base class for describing the project structure is XtextProjectConfig.

It is composed of several descriptors for the individual subprojects:. These subprojects are of type SubProjectConfig and offer important parameters:. Since setting all these parameters manually would be tedious and the structure of most Xtext projects is quite similar, it is advisable to use the StandardProjectConfig as shown in our example above.

This specialized project configuration xtext antlr options trading default values to all parameters, so you only have to specify those where you wish to override the defaults. For example, given the configuration. The configuration block of our generator workflow example above contains a Xtext antlr options trading as sibling of StandardProjectConfig. As the name suggests, the parameters of CodeConfig influence the generated code:.

The DefaultGeneratorModule is actually a Guice module, which can be subclassed in a similar way as explained in Dependency Injection for overriding default configurations. This allows to alter the configuration xtext antlr options trading places that are not accessible through MWE2. For instance, you could xtext antlr options trading your own subclass of XtextGeneratorNaming in order to influence the names of generated classes.

The base class for describing a language configuration is XtextGeneratorLanguagewhose most important parameters are. The actual code generation is performed by generator fragmentswhich can be added to a language configuration using the fragment property.

The main contribution of StandardLanguage is a default list of generator fragments xtext antlr options trading includes all features of Xtext. These fragments automatically adapt their generated code to your language and project configuration. Some fragments offer their own configuration parameters, hence each fragment can be accessed via a dedicated property in StandardLanguage.

For instance, in the language configuration. It is not possible to remove xtext antlr options trading from the StandardLanguage.

If you need a language configuration where one or more of the default fragments are xtext antlr options trading, you can do so by using XtextGeneratorLanguage instead and listing the required fragments explicitly.

You xtext antlr options trading take the following configuration as a template:. As explained in the grammar xtext antlr options trading reference it is possible to import existing metamodels into your language definition.

This is generally preferable, and other URI schemes are considered deprecated. With a namespace URI the package will be read from the Xtext index and therefore your grammar is independent from the concrete location of the respective ecore file. You have to make sure though that the ecore file is contained xtext antlr options trading a project that is managed by Xtext.

Therefore the project has to have the Xtext project nature attached. Ecore files that reside in referenced Java archives JARs are automatically xtext antlr options trading up and indexed if the referencing project itself is an Xtext project.

In order to be able to find the referenced package in the xtext antlr options trading generator, its Ecore generator model has to be mentioned in the language configuration:.

If you are importing more than one metamodel, you can add more referencedResource declarations as required. In some occasions this simple way of referencing metamodels is not sufficient; you can then use the StandaloneSetup as a Workflow bean for fine-tuning your EMF setup.

All Xtext components are assembled by means of dependency injection DI. This means basically that whenever some code is in need for functionality or state from another component, one just declares the dependency rather then stating how to resolve it, i. For instance when some code wants to use a scope provider, it just xtext antlr options trading a field or method or constructor and adds the Inject xtext antlr options trading.

It is not the duty of the client code to care about where the IScopeProvider implementation comes from or how it is created. When the above class is instantiated, Guice sees that it requires an instance of IScopeProvider and assigns it to the specified field or method parameter.

This of course only works if the object itself is created by Guice. In Xtext almost every instance is created that way and therefore the whole dependency net is controlled and configured by the means of Guice.

Guice of course needs to know how to instantiate real objects for declared dependencies. This is done xtext antlr options trading so-called Modules. A Module defines a set of mappings from types to either existing instances, instance providers or concrete classes. Modules are implemented in Java. With plain Guice modules one implements a method called configure and gets a Binder passed in. That binder provides a fluent API to define the mentioned mappings.

After running the Xtext generator you get several different modules for your language: The bindings from the runtime module are shared by all integration projects. Xtext comes with a slightly enhanced module API. The abstract base class AbstractGenericModule looks reflectively for certain methods in order to find declared bindings.

The most common kind of method is. Having one method per binding allows to deactivate individual bindings by overriding the corresponding methods and either change the binding by returning a different target type or removing that binding completely by returning null.

There are two additional kinds of binding-methods supported. The first one allows to configure a Providerwhich is like a factory for one specific type. This one can be used if you need a hook xtext antlr options trading an instance of a certain type is created. For instance if you want to provide lazy access xtext antlr options trading a singleton or you need to do some computation each time an instance is created i.

If you want to point to a provider rather than to a concrete class you can use the following binding method. Please forgive us the overuse of the term provider. That binding tells Guice to instantiate MyConcreteScopeProviderFactory and invoke get in order to obtain an instance of IScopeProvider for clients having declared a dependency to that type. Both mentioned binding methods are allowed to return an instance instead of a type. This may be useful if some global state should be shared in the application.

For a simple instance this would be. The third binding method provided by Xtext allows to do anything you can do with the binding API of Guice, since it allows you to use the Binder directly. These are the basic ideas around Guice and the small extension Xtext provides xtext antlr options trading top. For more information we strongly encourage you to read through the documentation on the website of Google Guice.

In every application wired up with Guice there is usually one point where you initialize an Injector using the modules declared. Usually this is done with the static methods of Guice. In Xtext, however, you should never instantiate the injector of your language yourself. Xtext may be used in different environments which introduce different constraints. Especially important is the difference between OSGi managed containers and plain vanilla Java programs.

To honor these differences Xtext uses the concept of ISetup implementations in normal mode and uses the extension mechanism of Eclipse when it should be configured in an OSGi environment. For each language there is an implementation of ISetup generated.

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