ranty 1.0.0

The Ranty procedural templating language
Documentation 
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use super::*;
use crate::util;

/// `[$is-odd: val (int)]`
///
/// Returns true if `val` is odd.
pub fn is_odd(vm: &mut VM, val: i64) -> RantyStdResult {
    vm.cur_frame_mut().write(val % 2 != 0);
    Ok(())
}

/// `[$is-even: val (int)]`
///
/// Returns true if `val` is even.
pub fn is_even(vm: &mut VM, val: i64) -> RantyStdResult {
    vm.cur_frame_mut().write(val % 2 == 0);
    Ok(())
}

/// `[$is-factor: value (int); factor (int)]`
///
/// Returns true if `value` is divisible by `factor`.
pub fn is_factor(vm: &mut VM, (value, factor): (i64, i64)) -> RantyStdResult {
    vm.cur_frame_mut().write(factor != 0 && value % factor == 0);
    Ok(())
}

pub fn is_string(vm: &mut VM, value: RantyValue) -> RantyStdResult {
    vm.cur_frame_mut()
        .write(value.get_type() == RantyValueType::String);
    Ok(())
}

pub fn is_int(vm: &mut VM, value: RantyValue) -> RantyStdResult {
    vm.cur_frame_mut()
        .write(value.get_type() == RantyValueType::Int);
    Ok(())
}

pub fn is_float(vm: &mut VM, value: RantyValue) -> RantyStdResult {
    vm.cur_frame_mut()
        .write(value.get_type() == RantyValueType::Float);
    Ok(())
}

pub fn is_number(vm: &mut VM, value: RantyValue) -> RantyStdResult {
    vm.cur_frame_mut().write(matches!(
        value.get_type(),
        RantyValueType::Int | RantyValueType::Float
    ));
    Ok(())
}

pub fn is_between(
    vm: &mut VM,
    (value, a, b): (RantyValue, RantyValue, RantyValue),
) -> RantyStdResult {
    let (a, b) = util::minmax(a, b);
    let result = value >= a && value <= b;
    vm.cur_frame_mut().write(result);
    Ok(())
}

pub fn is(vm: &mut VM, (value, type_name): (RantyValue, String)) -> RantyStdResult {
    vm.cur_frame_mut().write(value.type_name() == type_name);
    Ok(())
}

pub fn is_nothing(vm: &mut VM, value: RantyValue) -> RantyStdResult {
    vm.cur_frame_mut().write(value.is_nothing());
    Ok(())
}

pub fn is_some(vm: &mut VM, value: RantyValue) -> RantyStdResult {
    vm.cur_frame_mut().write(!value.is_nothing());
    Ok(())
}

pub fn is_bool(vm: &mut VM, value: RantyValue) -> RantyStdResult {
    vm.cur_frame_mut()
        .write(value.get_type() == RantyValueType::Boolean);
    Ok(())
}

pub fn is_nan(vm: &mut VM, value: RantyValue) -> RantyStdResult {
    vm.cur_frame_mut().write(value.is_nan());
    Ok(())
}