Attribute Grammars: Difference between revisions
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S-attributed grammars: only synthesized attributes. | S-attributed grammars: only synthesized attributes. | ||
L-attributed grammars: inherited attributes are only dependent on the parents' attributes or on the older | L-attributed grammars: inherited attributes are only dependent on the parents' attributes or on the older siblings' (i.e., when evaluating left-to-right, only previously seen attributes are needed). | ||
== Exercises == | == Exercises == | ||
Revision as of 10:46, 15 April 2010
Topics: attributes in grammar symbols; syntax-directed evaluation.
Synthesized attributes: passed from child nodes to parent nodes.
Inherited attributes: may be passed from parent- to child nodes or between siblings.
S-attributed grammars: only synthesized attributes.
L-attributed grammars: inherited attributes are only dependent on the parents' attributes or on the older siblings' (i.e., when evaluating left-to-right, only previously seen attributes are needed).