qasmsim 1.3.1

A QASM interpreter and quantum simulator in Rust
Documentation 
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use std::collections::HashMap;

use crate::grammar::ast;

#[derive(Debug, Clone, PartialEq, Eq)]
pub struct ArgumentSolver<'bindings>(&'bindings HashMap<String, ast::Argument>);

impl<'bindings> ArgumentSolver<'bindings> {
    pub fn new(argument_table: &'bindings HashMap<String, ast::Argument>) -> Self {
        ArgumentSolver::<'bindings>(argument_table)
    }

    pub fn solve(&self, arg: &ast::Argument) -> Result<ast::Argument, String> {
        match arg {
            ast::Argument::Id(name) => match self.0.get(name) {
                None => Err(name.clone()),
                Some(argument) => Ok(argument.clone()),
            },
            _ => unreachable!("while solving, only valid argument style is Argument::Id"),
        }
    }
}

#[cfg(test)]
mod test {
    use super::*;
    use std::iter::FromIterator;

    #[test]
    fn test_replace_formal_parameter_with_actual_parameter() {
        let actual_argument = ast::Argument::Item("actual".to_owned(), 0);
        let bindings = HashMap::from_iter(vec![("formal".to_owned(), actual_argument.clone())]);
        let solver = ArgumentSolver::new(&bindings);
        let formal_argument = ast::Argument::Id("formal".to_owned());
        let argument = solver.solve(&formal_argument).expect("get actual argument");
        assert_eq!(argument, actual_argument);
    }

    #[test]
    fn test_actual_parameter_not_found() {
        let actual_argument = ast::Argument::Item("actual".to_owned(), 0);
        let bindings = HashMap::from_iter(vec![("formal".to_owned(), actual_argument)]);
        let solver = ArgumentSolver::new(&bindings);
        let formal_argument = ast::Argument::Id("fmal".to_owned());
        let error = solver
            .solve(&formal_argument)
            .expect_err("actual argument not found");
        assert_eq!(error, String::from("fmal"));
    }
}