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An attribute grammar is a formal way to supplement a formal grammar with semantic information processing. Semantic information is stored in attributes associated with terminal and nonterminal symbols of the grammar. The values of attributes are the result of attribute evaluation rules associated with productions of the grammar.
S-attributed grammars are a class of attribute grammars characterized by having no inherited attributes, but only synthesized attributes.Inherited attributes, which must be passed down from parent nodes to children nodes of the abstract syntax tree during the semantic analysis of the parsing process, are a problem for bottom-up parsing because in bottom-up parsing, the parent nodes of the ...
L-attributed grammars are a special type of attribute grammars. [1] They allow the attributes to be evaluated in one depth-first left-to-right traversal of the abstract syntax tree. As a result, attribute evaluation in L-attributed grammars can be incorporated conveniently in top-down parsing.
the hypergrammar is an attribute grammar, i.e. a set of context-free grammar rules in which the nonterminals may have attributes; and; the metagrammar is a context-free grammar defining possible values for these attributes. The set of strings generated by a W-grammar is defined by a two-stage process:
An attributive verb is a verb that modifies (expresses an attribute of) a noun in the manner of an attributive adjective, rather than express an independent idea as a predicate. In English (and in most European languages), verb forms that can be used attributively are typically non-finite forms — participles and infinitives — as well as ...
As a result, attribute evaluation in LR-attributed grammars can be incorporated conveniently in bottom-up parsing. zyacc is based on LR-attributed grammars. They are a subset of the L-attributed grammars , where the attributes can be evaluated in one left-to-right traversal of the abstract syntax tree.
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ECLR-attributed grammars are a special type of attribute grammars. They are a variant of LR-attributed grammars where an equivalence relation on inherited attributes is used to optimize attribute evaluation. EC stands for equivalence class.
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