titlefmt 0.4.0

Metadata Title Formatting Library
Documentation 
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use super::Error;
use expression::{Evaluation, Expression, Value};
use metadata;

pub fn muldiv<T: metadata::Provider>(
    expressions: &[Box<Expression<T>>],
    provider: &T,
) -> Result<Evaluation, Error> {
    if expressions.len() != 3 {
        return Err(Error::ArgumentError);
    }
    // get all the arguments
    // first check that the last one isn't null (for the division)
    let (c, c_truth) = expect_integer_result!(&expressions[2], provider);
    if c == 0 {
        return Err(Error::ArgumentError);
    }
    let (a, a_truth) = expect_integer_result!(&expressions[0], provider);
    let (b, b_truth) = expect_integer_result!(&expressions[1], provider);
    Ok(Evaluation::new(
        Value::Integer((a * b) / c),
        a_truth | b_truth | c_truth,
    ))
}