In the third installment of the series Markus Voelter and Vaclav Pech explore a custom money language. They show how to customize the editor behavior through actions, how to override operators for your custom types, how to build a DSL on top of an existing Java library and most of all how to multiply money with MPS.
You can also grab the sources used in the screencast and experiment yourself.
Note: You may like to check out the fourth episode of the series.
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