Struct cfgrammar::yacc::grammar::SentenceGenerator

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pub struct SentenceGenerator<'a, StorageT> { /* private fields */ }
Expand description

A SentenceGenerator can generate minimal sentences for any given rule. e.g. for the grammar:

%start A
%%
A: A B | ;
B: C | D;
C: 'x' B | 'x';
D: 'y' B | 'y' 'z';

the following are valid minimal sentences:

A: []
B: [x]
C: [x]
D: [y, x] or [y, z]

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impl<'a, StorageT: 'static + PrimInt + Unsigned> SentenceGenerator<'a, StorageT>
where usize: AsPrimitive<StorageT>,

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pub fn min_sentence_cost(&self, ridx: RIdx<StorageT>) -> u16

What is the cost of a minimal sentence for the rule ridx? Note that, unlike min_sentence, this function does not actually build a sentence and it is thus much faster.

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pub fn max_sentence_cost(&self, ridx: RIdx<StorageT>) -> Option<u16>

What is the cost of a maximal sentence for the rule ridx? Rules which can generate sentences of unbounded length return None; rules which can only generate maximal strings of a finite length return a Some(u16).

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pub fn min_sentence(&self, ridx: RIdx<StorageT>) -> Vec<TIdx<StorageT>>

Non-deterministically return a minimal sentence from the set of minimal sentences for the rule ridx.

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pub fn min_sentences(&self, ridx: RIdx<StorageT>) -> Vec<Vec<TIdx<StorageT>>>

Return (in arbitrary order) all the minimal sentences for the rule ridx.

Auto Trait Implementations§

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impl<'a, StorageT> !Freeze for SentenceGenerator<'a, StorageT>

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impl<'a, StorageT> !RefUnwindSafe for SentenceGenerator<'a, StorageT>

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impl<'a, StorageT> Send for SentenceGenerator<'a, StorageT>
where StorageT: Sync,

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impl<'a, StorageT> !Sync for SentenceGenerator<'a, StorageT>

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impl<'a, StorageT> Unpin for SentenceGenerator<'a, StorageT>

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impl<'a, StorageT> UnwindSafe for SentenceGenerator<'a, StorageT>
where StorageT: RefUnwindSafe,

Blanket Implementations§

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into<U> for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.