Abstract
PAG ( Prototyping with Attribute Grammars ) is an environment that promotes active learning in courses on language processing (e.g. compiler construction and computational linguistics). In PAG, learners can specify the syntax and the semantics of their languages with attribute grammars. Then, the environment generates prototypes of processors for the languages specified which learners can test with different inputs. For each valid input the prototypes produce one or more decorated syntax trees, which learners can navigate using the semantic equations in the original grammar. In this paper we describe the environment and we report its educational uses.
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