cfg_predict

Struct LastSets

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pub struct LastSets { /* private fields */ }
Expand description

FIRST sets.

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impl LastSets

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pub fn new<G>(grammar: &G) -> Self
where G: RuleContainer + Default,

Compute all LAST sets of the grammar.

We define a binary relation LAST(N, S), in which N is related to S if the grammar has a production of the form N ⸬= α S β, where β is a nullable string of symbols.

We compute the transitive closure of this relation.

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impl PredictSets for LastSets

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fn predict_sets(&self) -> &PerSymbolSets

Returns a reference to FIRST sets.

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