Struct ExpressionVisitor 

pub struct ExpressionVisitor<'a, C, T = DefaultTypeSet> {
    pub context: &'a mut C,
    pub source: &'a str,
    pub _marker: PhantomData<T>,
}

A visitor that can process an abstract syntax tree.

Fields

context: &'a mut C

The context in which the expression is evaluated.

source: &'a str

The source code from which the expression was parsed.

_marker: PhantomData<T>

The types of the variables in the context.

Implementations

impl<'a, C, T> ExpressionVisitor<'a, C, T>

where C: ExprContext<T>, T: TypeSet,

pub fn visit_expression( &mut self, expression: &Expression<T::Parser>, ) -> Result<TypedValue<T>, EvalError>

Visits an expression and evaluates it, returning the result as a TypedValue.

pub fn visit_right_hand_expression( &mut self, expression: &RightHandExpression<T::Parser>, ) -> Result<TypedValue<T>, EvalError>

Visits an expression and evaluates it, returning the result as a TypedValue.

pub fn visit_function( &mut self, function: &Function<T::Parser>, args: &[TypedValue<T>], ) -> Result<TypedValue<T>, EvalError>

Evaluates a function with the given arguments.