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use params::{Map, Value};
pub fn validate_numeric(values: &Map, field: &[&str]) -> Result<Option<Value>, String> {
match values.find(field) {
Some(&Value::String(ref value)) => {
if value.is_empty() {
// Allow empty values
return Ok(None);
}
let positive = value.parse::<u64>();
match positive {
Ok(uvalue) => Ok(Some(Value::U64(uvalue))),
Err(_) => {
let negative = value.parse::<i64>();
match negative {
Ok(ivalue) => Ok(Some(Value::I64(ivalue))),
Err(_) => {
let float = value.parse::<f64>();
match float {
Ok(fvalue) => Ok(Some(Value::F64(fvalue))),
Err(_) => {
Err(format!("The {} field must be numeric.",
field.last()
.unwrap()
.to_lowercase()
.replace("_", " ")))
}
}
}
}
}
}
}
Some(&Value::U64(_)) |
Some(&Value::I64(_)) |
Some(&Value::F64(_)) => Ok(None),
None => {
// Allow empty values
Ok(None)
}
_ => {
Err(format!("The {} field must be numeric.",
field.last()
.unwrap()
.to_lowercase()
.replace("_", " ")))
}
}
}