Beyond operator-precedence grammars and languages
Journal of Computer and System Sciences(2020)
摘要
Operator Precedence Languages (OPL) are deterministic context-free and have desirable properties. OPL are parallely parsable, and, when structurally compatible, are closed under Boolean operations, concatenation and star; they include the Input Driven languages. OPL use three relations between two terminal symbols, to assign syntax structure to words. We extend such relations to k-tuples of consecutive symbols, in agreement with strictly locally testable regular languages. For each k, the new corresponding class of Higher-order Operator Precedence languages properly includes the OPL and enjoy many of their properties. OPL are a strict hierarchy based on k, which contains maximal languages.
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关键词
Operator precedence languages,Input-driven languages,Visibly pushdown languages,Deterministic context-free languages,Syntactic tags,Boolean closure,Locally testable languages,Local parsability,Grammar inference
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