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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 .
LR-attributed grammar: an L-attributed grammar whose inherited attributes can also be evaluated in bottom-up parsing. ECLR-attributed grammar : a subset of LR-attributed grammars where equivalence classes can be used to optimize the evaluation of inherited attributes.
L-attributed grammar; LR-attributed grammar; Myhill-Nerode theorem; Parsing expression grammar; Prefix grammar; Pumping lemma; Recursively enumerable language; Regular expression; Regular grammar; Regular language; S-attributed grammar; Star height; Star height problem; Syntactic monoid; Syntax (logic) Tree-adjoining grammar
The formal study of grammar is an important part of children's schooling from a young age through advanced learning, though the rules taught in schools are not a "grammar" in the sense that most linguists use, particularly as they are prescriptive in intent rather than descriptive.
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. L-attributed grammar; Language equation; Language identification in the limit; Left recursion; Leftist grammar; Lexical grammar; Linear grammar; Literal movement grammar; LL grammar; Local language (formal language) Locally catenative sequence; Longest increasing subsequence; Longest repeated substring problem; LR-attributed grammar
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.
A grammar specification embedded with actions to be performed is called a syntax-directed translation scheme [1] (sometimes simply called a 'translation scheme'.) Each symbol in the grammar can have an attribute, which is a value that is to be associated with the symbol. Common attributes could include a variable type, the value of an ...
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