Ambiguity functions of context-free grammars and languages
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چکیده
منابع مشابه
Universal Inherence of Cycle-Free Context-Free Ambiguity Functions
It is shown that the set of inherent ambiguity functions for context-free languages and the set of ambiguity functions for cycle-free context-free grammars coincide. Moreover for each census function γ of an unambiguous context-free language the least monotone function larger than or equal to γ is an inherent ambiguity function. Both results are based on a more general theorem. Informally it st...
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Static ambiguity detection would be an important aspect of language workbenches for textual software languages. The challenge is that automatic ambiguity detection of context-free grammars is undecidable. Sophisticated approximations and optimizations do exist, but these do not scale to grammars for so-called “scannerless parsers”, as of yet. We extend previous work on ambiguity detection for c...
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We show that ambiguity in context-free grammars can be decomposed into union-ambiguity and concatenation-ambiguity. We also show that the traditional proof of the undecidability of ambiguity in context-free grammars addresses only one part of ambiguity, namely the union-ambiguity. We extend this result by showing that the concatenation-ambiguity is also undecidable. Context-free grammars (CFGs)...
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Static ambiguity detection would be an important aspect of language workbenches for textual software languages. However, the challenge is that automatic ambiguity detection in context-free grammars is undecidable in general. Sophisticated approximations and optimizations do exist, but these do not scale to grammars for so-called “scannerless parsers”, as of yet. We extend previous work on ambig...
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