International audienceImplementing Programming Languages (PLs) has always been a challenge for various reasons. One reason is the excess of routine tasks to be redone on every implementation cycle. This is despite the remarkable fraction of syntax and semantics usually shared between successive cycles. In this paper, we present a component-based approach to avoid reimplementation of shared PL fractions. We provide two sets of reusable components; one for syntax implementation and another for semantics. Our syntax and semantics components correspond to syntactic categories and semantics rules of a PL specification, respectively. We show how, in addition to their service to reusability in syntax and semantics, our components can cater reusabl...