FirstSets

cfg_predict_sets::first

Struct FirstSets 

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

Collector of FIRST sets.

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impl FirstSets

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pub fn new(grammar: &Cfg) -> Self

Compute all FIRST sets of the grammar.

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

We compute the transitive closure of this relation.

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pub fn first_set_for_string(&self, string: &[Symbol]) -> PerSymbolSetVal

Calculates a FIRST set for a string of symbols.

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impl PredictSets for FirstSets

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fn predict_sets(&self) -> &PerSymbolSets

Returns a reference to FIRST sets.

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