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  • What's new in MPS 2.5 M1

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The popup notification can be disabled in Settings -> IDE Settings -> Notifications -> Saving Transient Models Is On.

Custom persistence for MPS models through stubs

With the improved jetbrains.mps.lang.stubs language, which now supports write as well as read operations, it is now possible to declare a custom stubs model manager that supports model saving functionality. Using this extension point you can teach MPS how to interoperate with any custom persistence syntax. You can load and save your models from and into a format that fits your needs best. Read more at the Custom Persistence page.

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Make process improvements

mps.* ANT tasks were reimplemented to eliminate dependencies on the IntelliJ platform modules. This reduced the loading time and so speeded-up execution of mps.* tasks.

Version control

More reliable merge conflict handling with the MPS merge driver:

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Section 4 - Improvements to the out-of-the-box languages

New XML language

A new language named jetbrains.mps.core.xml was introduced in MPS 2.5. This XML language has been designed in accordance to the XML specification. We recommend that you use this new language instead of the old ones, if you need to work with XML in MPS. All the other XML languages will be deprecated in the future.

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refactorings
refactorings

Changes in the Refactoring language

In order to make the structure of MPS core languages more consistent and clear, the Refactoring language has been changes considerably. Several new and easy-to-use constructs have been added and parts of the functionality was deprecated and moved into the Actions language.

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  • create a UI action for the refactoring
  • copy the caption, create context parameters
  • add a refactoring keystroke with the newly created action to KeymapChangesDeclaration
  • create ActionGroupDeclaration for the refactoring that modifies the jetbrains.mps.ide.actions.NodeRefactoring action group at the default position
  • add an isApplicable clause to the action created; usually it is just is applicable refactoring< >() call
  • add an execute clause to the action created; all the parameter preparations that were in init of the refactoring should be moved here; at the end it is necessary to execute the refactoring with the prepared parameters (with execute refactoring< >(); statement)
  • remove all parameter preparation code from init of the refactoring, they are now prepared before the entry to init; you can still validate parameters and return false if the validation fails

Customizable scopes

An element that contains a reference to some other element typically knows nothing about the scope applicable to the reference. In such cases the best solution for finding applicable elements is to forward the request upwards in the AST. By implementing the ScopeProvider interface you can intercept such requests coming from your descendants and have full control over their scopes. Since BaseLanguage itself now also follows this strategy, you can easily restrict visible elements in embedded statements or expressions.

Textual references

The reference representation can now vary depending on the reference location, as it is in many existing textual languages. It allows languages to support the notion of qualified reference when simple name of the target element is not enough. The new API requires developers to provide the referenceText value as a part of the Scope implementation (see jetbrains.mps.scope.Scope). All references in BaseLanguage now support java-style resolving. Also, in case of broken references the referenceText serves as a hint to the developer to fix it easily.

TODO: a screen-shot ?

Custom persistence for MPS models through stubs

With the improved jetbrains.mps.lang.stubs language, which now supports write as well as read operations, it is now possible to declare a custom stubs model manager that supports model saving functionality. Using this extension point you can teach MPS how to interoperate with any custom persistence syntax. You can load and save your models from and into a format that fits your needs best. Read more at the Custom Persistence page.

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Section 5 - Other

New Productivity Guide

Good command of the tools is undoubtedly one of the attributes of an efficient developer. MPS 2.5 can monitor your actions and give you statistics on how frequently you use its most prominent editing and refactoring capabilities. Go to Help | Productivity Guide to see how well you do:

Additionaly, we've prepared a list of a couple dozen tricks you could learn through the Tip of the Day window to become more fluent with the MPS editor:

MPS.Classpath module removed

There are four specific modules used to expose all available Java API of the platform and MPS as JavaStub models:

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These modules were created as a substitution for the MPS.Classpath module that existed in previous versions. In essence, MPS.Classpath has been split into these four modules to isolate the core functionality from any dependencies on UI-/Editor-/Platform- specific APIs.

Distribution

One of the goals for MPS 2.5 release was making our platform modular. By exploring Plugins page in setting dialog it's easy to see increased number of plugin forming MPS 2.5 platform. If some plugins are not necessary for current tasks those plugins can be simply switched of increasing performance of the platform. Same trick can be used to create reduced IDE for some specific DSLs based on MPS.

Migration

If you already use MPS in your projects, you may benefit from reading our migration guide with detailed description of the migration process.