Struct rubble_templates_core::functions::FunctionWithContext[][src]

pub struct FunctionWithContext<F> where
    F: Fn(&[String], &mut Context) -> Result<String, SyntaxError>, 
{ /* fields omitted */ }
Expand description

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

Example:

use std::collections::HashMap;
use rubble_templates_core::evaluator::{Context, SyntaxError, Function};
use rubble_templates_core::functions::FunctionWithContext;

fn plus_function(parameters: &[String], _context: &mut Context) -> Result<String, SyntaxError> {
    Ok(
        parameters.iter()
            .map(|param|
                param.parse::<i32>().unwrap()
            )
            .sum::<i32>()
            .to_string()
    )
}

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

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Trait Implementations

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Gets the TypeId of self. Read more

Immutably borrows from an owned value. Read more

Mutably borrows from an owned value. Read more

Performs the conversion.

Performs the conversion.

The type returned in the event of a conversion error.

Performs the conversion.

The type returned in the event of a conversion error.

Performs the conversion.