ganit-core 0.4.0

Spreadsheet formula engine — parser and evaluator for Excel-compatible formulas
Documentation 
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use crate::eval::coercion::to_string_val;
use crate::eval::functions::check_arity;
use crate::eval::functions::engineering::{format_bin, get_places, parse_hex};
use crate::types::{ErrorKind, Value};

pub fn hex2bin_fn(args: &[Value]) -> Value {
    if let Some(err) = check_arity(args, 1, 2) {
        return err;
    }
    let places = match get_places(args) {
        Ok(p) => p,
        Err(e) => return e,
    };
    let s = match to_string_val(args[0].clone()) {
        Ok(v) => v,
        Err(e) => return e,
    };
    let n = match parse_hex(&s) {
        Some(v) => v,
        None => return Value::Error(ErrorKind::Num),
    };
    // Result must fit in 10-bit signed range (-512 to 511)
    if !(-512..=511).contains(&n) {
        return Value::Error(ErrorKind::Num);
    }
    match format_bin(n, places) {
        Ok(result) => Value::Text(result),
        Err(()) => Value::Error(ErrorKind::Num),
    }
}

#[cfg(test)]
mod tests;