Added formattedtext and better error class

src/evaluate/mod.rs

@@ -2,50 +2,4 @@ mod operator;
 mod function;
 mod evaluate;
 
-pub use self::evaluate::evaluate;
-
-#[derive(Debug)]
-pub enum EvalError {
-	BadMath,
-	TooBig,
-	ZeroDivision,
-	IncompatibleUnit,
-	IncompatibleUnits(String, String),
-	Undefined(String),
-	EvaluationError,
-	BadArguments(String, usize, usize)
-}
-
-
-impl ToString for EvalError {
-	fn to_string(&self) -> String {
-		match self {
-			EvalError::BadMath => {
-				String::from("Failed to evaluate expression")
-			},
-			EvalError::TooBig => {
-				String::from("Number too big")
-			},
-			EvalError::ZeroDivision => {
-				String::from("Division by zero")
-			},
-			EvalError::IncompatibleUnit => {
-				String::from("Incompatible unit")
-			},
-			EvalError::IncompatibleUnits(a, b) => {
-				format!("Incompatible units ({a} and {b})")
-			},
-			EvalError::Undefined(s) => {
-				format!("{s} is undefined")
-			},
-			EvalError::EvaluationError => {
-				String::from("Could not evaluate")
-			},
-			EvalError::BadArguments(s, want, got) => {
-				format!("{s} takes {want} argument{}, got {got}",
-					if *want == 1 {""} else {"s"},
-				)
-			}
-		}
-	}
-}
+pub use self::evaluate::evaluate;