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use gtmpl_value::{Number, Value};
pub fn mul(args: &[Value]) -> Result<Value, String> {
let mut res = Number::from(1);
for a in args {
if let Value::Number(n2) = a {
if let (Some(f1), Some(f2)) = (res.as_f64(), n2.as_f64()) {
res = Number::from(f1 * f2);
} else if let (Some(i1), Some(i2)) = (res.as_i64(), n2.as_i64()) {
res = Number::from(i1 * i2);
} else if let (Some(u1), Some(u2)) = (res.as_u64(), n2.as_u64()) {
res = Number::from(u1 * u2);
} else {
return Err("Numbers not compatible".to_string());
}
} else {
return Err(format!("not a number {:?}", a));
}
}
Ok(Value::Number(res))
}
pub fn div(args: &[Value]) -> Result<Value, String> {
if args.len() != 2 {
return Err("Divide requires exactly 2 arguments".to_string());
}
if let (Value::Number(a), Value::Number(b)) = (&args[0], &args[1]) {
if let (Some(f1), Some(f2)) = (a.as_f64(), b.as_f64()) {
Ok(Value::Number(Number::from(f1 / f2)))
} else if let (Some(i1), Some(i2)) = (a.as_i64(), b.as_i64()) {
Ok(Value::Number(Number::from(i1 + i2)))
} else if let (Some(u1), Some(u2)) = (a.as_u64(), b.as_u64()) {
Ok(Value::Number(Number::from(u1 + u2)))
} else {
Err("Numbers not compatible".to_string())
}
} else {
Err("Divide requires 2 Number arguments".to_string())
}
}
pub fn add(args: &[Value]) -> Result<Value, String> {
let mut res = Number::from(0);
for a in args {
if let Value::Number(n2) = a {
if let (Some(f1), Some(f2)) = (res.as_f64(), n2.as_f64()) {
res = Number::from(f1 + f2);
} else if let (Some(i1), Some(i2)) = (res.as_i64(), n2.as_i64()) {
res = Number::from(i1 + i2);
} else if let (Some(u1), Some(u2)) = (res.as_u64(), n2.as_u64()) {
res = Number::from(u1 + u2);
} else {
return Err("Numbers not compatible".to_string());
}
} else {
return Err(format!("not a number {:?}", a));
}
}
Ok(Value::Number(res))
}
pub fn sub(args: &[Value]) -> Result<Value, String> {
if args.len() == 0 {
return Err("No Args".to_string());
}
let n = match &args[0] {
Value::Number(n) => n,
_ => return Err("Cannot sub non num".to_string()),
};
if args.len() == 1 {
if let Some(f) = n.as_f64() {
return Ok(Value::Number(Number::from(-f)));
} else if let Some(i) = n.as_i64() {
return Ok(Value::Number(Number::from(-i)));
}
return Err("Too big to negate".to_string());
}
let mut res = n.clone();
for a in &args[1..] {
if let Value::Number(n2) = a {
if let (Some(f1), Some(f2)) = (res.as_f64(), n2.as_f64()) {
res = Number::from(f1 - f2);
} else if let (Some(i1), Some(i2)) = (res.as_i64(), n2.as_i64()) {
res = Number::from(i1 - i2);
} else if let (Some(u1), Some(u2)) = (res.as_u64(), n2.as_u64()) {
if u1 < u2 {
return Err(format!("Cannot subtract {} from {}", u2, u1));
}
res = Number::from(u1 - u2);
} else {
return Err("Numbers not compatible".to_string());
}
} else {
return Err(format!("not a number {:?}", a));
}
}
Ok(Value::Number(res))
}
pub fn imod(args: &[Value]) -> Result<Value, String> {
if args.len() != 2 {
Err("helper 'mod' requires exactly 2 arguments")?;
}
match (&args[0], &args[1]) {
(Value::Number(a), Value::Number(b)) => {
if let (Some(ai), Some(bi)) = (a.as_i64(), b.as_i64()) {
return Ok(Value::Number(Number::from(ai % bi)));
}
if let (Some(au), Some(bu)) = (a.as_u64(), b.as_u64()) {
return Ok(Value::Number(Number::from(au % bu)));
}
Err("Helper 'mod' requires both arguments to be integers".to_string())
}
_ => Err("Helper 'mod' requires both arguments to be integers".to_string()),
}
}
pub fn idiv(args: &[Value]) -> Result<Value, String> {
if args.len() != 2 {
Err("helper 'idiv' requires exactly 2 arguments")?;
}
match (&args[0], &args[1]) {
(Value::Number(a), Value::Number(b)) => {
if let (Some(ai), Some(bi)) = (a.as_i64(), b.as_i64()) {
return Ok(Value::Number(Number::from(ai / bi)));
}
if let (Some(au), Some(bu)) = (a.as_u64(), b.as_u64()) {
return Ok(Value::Number(Number::from(au / bu)));
}
Err("Helper 'idiv' requires both arguments to be integers".to_string())
}
_ => Err("Helper 'idiv' requires both arguments to be integers".to_string()),
}
}