Struct rubble_templates::evaluator::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], &HashMap<String, String>) -> Result<String, SyntaxError>
, to be used in Evaluator.
Example:
use rubble_templates::evaluator::{Evaluator, Function, SyntaxError, Context}; use rubble_templates::evaluator::ast::SyntaxNode; use std::collections::HashMap; use rubble_templates::template::Template; use rubble_templates::compile_template_from_string; use rubble_templates::evaluator::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> let variables: HashMap<String, String> = HashMap::new(); let result = compile_template_from_string("2 + 2 = {{ plus 2 2 }}".to_string(), variables, functions); assert_eq!(result.ok(), Some("2 + 2 = 4".to_string()));
Implementations
impl<F> FunctionWithContext<F> where
F: Fn(&[String], &mut Context) -> Result<String, SyntaxError>,
[src]
impl<F> FunctionWithContext<F> where
F: Fn(&[String], &mut Context) -> Result<String, SyntaxError>,
[src]Trait Implementations
Auto Trait Implementations
impl<F> RefUnwindSafe for FunctionWithContext<F> where
F: RefUnwindSafe,
impl<F> Send for FunctionWithContext<F> where
F: Send,
impl<F> Sync for FunctionWithContext<F> where
F: Sync,
impl<F> Unpin for FunctionWithContext<F> where
F: Unpin,
impl<F> UnwindSafe for FunctionWithContext<F> where
F: UnwindSafe,