Struct rusty_lr::DefaultCallback

pub struct DefaultCallback {}

default callback that does nothing

Trait Implementations

impl<Term, NonTerm> Callback<Term, NonTerm> for DefaultCallback

type Error = u8

default Display-able error type

fn reduce( &mut self, rules: &[ProductionRule<Term, NonTerm>], states: &[State<Term, NonTerm>], state_stack: &[usize], rule: usize, ) -> Result<(), <DefaultCallback as Callback<Term, NonTerm>>::Error>

this is called after poping N states from the state stack, where N is the number of tokens of the reduced rule production rule matched and reduce

fn shift_and_goto( &mut self, rules: &[ProductionRule<Term, NonTerm>], states: &[State<Term, NonTerm>], state_stack: &[usize], term: &Term, ) -> Result<(), <DefaultCallback as Callback<Term, NonTerm>>::Error>

this is called after the shift of terminal symbol and state transition the actual state-transition of DFA is managed by parser if you are tyring to track the state transition with this method, you must also consider reduce method, which pop N states from the state stack, where N is the number of tokens of the reduced rule

fn shift_and_goto_nonterm( &mut self, rules: &[ProductionRule<Term, NonTerm>], states: &[State<Term, NonTerm>], state_stack: &[usize], nonterm: &NonTerm, ) -> Result<(), <DefaultCallback as Callback<Term, NonTerm>>::Error>

this is called after the shift of non-terminal symbol and state transition the actual state-transition of DFA is managed by parser if you are tyring to track the state transition with this method, you must also consider reduce method, which pop N states from the state stack, where N is the number of tokens of the reduced rule