Struct FunctionWithAst

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pub struct FunctionWithAst<F>
where F: Fn(&dyn Evaluator, &[SyntaxNode], &mut Context) -> Result<String, SyntaxError>,
{ /* private fields */ }
Expand description

A wrapper for a Fn(&dyn Evaluator, &[SyntaxNode], &mut Context) -> Result<String, SyntaxError>, to be used in Evaluator.

Example:

use rubble_templates_core::evaluator::{Evaluator, Function, SyntaxError, Context};
use std::collections::HashMap;
use rubble_templates_core::ast::SyntaxNode;
use rubble_templates_core::functions::FunctionWithAst;

fn plus_function(evaluator: &dyn Evaluator, parameters: &[SyntaxNode], context: &mut Context) -> Result<String, SyntaxError> {
    Ok(
        parameters.iter()
            .map(|node|
                evaluator.evaluate(node, context).unwrap().parse::<i32>().unwrap()
            )
            .sum::<i32>()
            .to_string()
    )
}

let mut functions: HashMap<String, Box<dyn Function>> = HashMap::new();
functions.insert("plus".to_string(), FunctionWithAst::new(plus_function)); // will be treated as Box<dyn Function>

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impl<F> FunctionWithAst<F>
where F: Fn(&dyn Evaluator, &[SyntaxNode], &mut Context) -> Result<String, SyntaxError>,

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pub fn new(function: F) -> Box<FunctionWithAst<F>>

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impl<F> Function for FunctionWithAst<F>
where F: Fn(&dyn Evaluator, &[SyntaxNode], &mut Context) -> Result<String, SyntaxError>,

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fn evaluate( &self, evaluator: &dyn Evaluator, parameters: &[SyntaxNode], context: &mut Context, ) -> Result<String, SyntaxError>

Auto Trait Implementations§

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impl<F> Freeze for FunctionWithAst<F>
where F: Freeze,

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impl<F> RefUnwindSafe for FunctionWithAst<F>
where F: RefUnwindSafe,

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impl<F> Send for FunctionWithAst<F>
where F: Send,

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impl<F> Sync for FunctionWithAst<F>
where F: Sync,

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impl<F> Unpin for FunctionWithAst<F>
where F: Unpin,

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impl<F> UnwindSafe for FunctionWithAst<F>
where F: UnwindSafe,

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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.