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Made multiply function more DRY

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This commit is contained in:
Kasper 2020-11-21 20:46:55 +01:00
parent 6553c50d1d
commit 3a0518e82d
1 changed files with 12 additions and 7 deletions
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19
src/units.rs
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@ -388,6 +388,10 @@ pub fn to_ideal_unit(number: Number) -> Number {
/// - If you multiply `Length` with `Length`, the result has a unit of `Area`, etc.
/// - If you multiply `Speed` with `Time`, the result has a unit of `Length`
pub fn multiply(left: Number, right: Number) -> Result<Number, String> {
Ok(actual_multiply(left, right, false)?)
}
fn actual_multiply(left: Number, right: Number, swapped: bool) -> Result<Number, String> {
let lcat = left.unit.category();
let rcat = right.unit.category();
if left.unit == NoUnit && right.unit == NoUnit {
@ -397,17 +401,14 @@ pub fn multiply(left: Number, right: Number) -> Result<Number, String> {
// if temperature
Err(format!("Cannot multiply {:?} and {:?}", left.unit, right.unit))
} else if left.unit == NoUnit && right.unit != NoUnit {
// 3 * 1 km
// 3 * 1 anyunit
Ok(Number::new(left.value * right.value, right.unit))
} else if left.unit != NoUnit && right.unit == NoUnit {
// 1 km * 3
Ok(Number::new(left.value * right.value, left.unit))
} else if lcat == Length && rcat == Length {
// length * length
let result = (left.value * left.unit.weight()) * (right.value * right.unit.weight());
Ok(to_ideal_unit(Number::new(result, SquareMillimeter)))
} else if (lcat == Length && rcat == Area) || (lcat == Area && rcat == Length) {
// length * area, area * length
} else if lcat == Length && rcat == Area {
// length * area
let result = (left.value * left.unit.weight()) * (right.value * right.unit.weight());
Ok(to_ideal_unit(Number::new(result, CubicMillimeter)))
} else if lcat == Speed && rcat == Time {
@ -426,7 +427,11 @@ pub fn multiply(left: Number, right: Number) -> Result<Number, String> {
let kilometers = Number::new(result, Kilometer);
Ok(convert(kilometers, final_unit)?)
} else {
Err(format!("Cannot multiply {:?} and {:?}", left.unit, right.unit))
if swapped == true {
Err(format!("Cannot multiply {:?} and {:?}", left.unit, right.unit))
} else {
actual_multiply(right, left, true)
}
}
}