Struct cfg::cycles::Cycles

pub struct Cycles<G> { /* fields omitted */ }

Provides information about cycles among unit derivations in the grammar. There are two ways of pruning cycles.

Methods

impl<'a, G> Cycles<&'a mut G> where
    G: ContextFree,
    &'b G: ContextFreeRef<'b, Target = G>,
    &'b mut G: ContextFreeMut<'b, Target = G>, 

fn new(grammar: &'a mut G) -> Cycles<&'a mut G>

Analyzes the grammar's cycles.

fn cycle_free(&self) -> bool

Checks whether the grammar is cycle-free.

impl<'a, G> Cycles<&'a mut G> where
    G: ContextFree,
    &'a G: ContextFreeRef<'a, Target = G>,
    &'a mut G: ContextFreeMut<'a, Target = G>, 

fn cycle_participants(
    &'a self
) -> CycleParticipants<'a, G, <&'a G as ContextFreeRef<'a>>::Rules>

Iterates over rules that participate in a cycle.

fn remove_cycles(&mut self) where
    &'a G: ContextFreeRef<'a, Target = G>,
    &'a mut G: ContextFreeMut<'a, Target = G>, 

Removes all rules that participate in a cycle. Doesn't preserve the language represented by the grammar.

fn rewrite_cycles(&mut self) where
    G::History: Clone,
    &'a G: ContextFreeRef<'a, Target = G>,
    &'a mut G: ContextFreeMut<'a, Target = G>, 

Rewrites all rules that participate in a cycle. Preserves the language represented by the grammar.