Trait conch_runtime::eval::ParamEval

pub trait ParamEval<E: ?Sized> {
    type EvalResult: StringWrapper;
    fn eval(
        &self, 
        split_fields_further: bool, 
        env: &E
    ) -> Option<Fields<Self::EvalResult>>;
    fn assig_name(&self) -> Option<Self::EvalResult>;
}

A trait for evaluating parameters.

Associated Types

type EvalResult: StringWrapper

The underlying representation of the evaulation type (e.g. String, Rc<String>).

Required Methods

fn eval(
    &self,
    split_fields_further: bool,
    env: &E
) -> Option<Fields<Self::EvalResult>>

Evaluates a parameter in the context of some environment, optionally splitting fields.

A None value indicates that the parameter is unset.

fn assig_name(&self) -> Option<Self::EvalResult>

Returns the (variable) name of the parameter to be used for assignments, if applicable.

Implementations on Foreign Types

impl<T, E: ?Sized> ParamEval<E> for Parameter<T> where
    T: StringWrapper,
    E: ArgumentsEnvironment<Arg = T> + LastStatusEnvironment + VariableEnvironment<Var = T>,
    E::VarName: Borrow<String>, 

type EvalResult = T

fn eval(
    &self,
    split_fields_further: bool,
    env: &E
) -> Option<Fields<Self::EvalResult>>

fn assig_name(&self) -> Option<Self::EvalResult>

impl<'a, E: ?Sized, P: ?Sized + ParamEval<E>> ParamEval<E> for &'a P

type EvalResult = P::EvalResult

fn eval(
    &self,
    split_fields_further: bool,
    env: &E
) -> Option<Fields<Self::EvalResult>>

fn assig_name(&self) -> Option<Self::EvalResult>

Implementors