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use params::{Map, Value};
pub fn validate_digits(values: &Map,
field: &[&str],
digits: usize)
-> 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) => {
if value.len() == digits {
Ok(Some(Value::U64(uvalue)))
} else {
Err(format!("The {} field must be a number with {} digits.",
field.last()
.unwrap()
.to_lowercase()
.replace("_", " "),
digits))
}
}
Err(_) => {
let negative = value.parse::<i64>();
match negative {
Ok(ivalue) => {
if value[1..].len() == digits {
Ok(Some(Value::I64(ivalue)))
} else {
Err(format!("The {} field must be a number with {} digits.",
field.last()
.unwrap()
.to_lowercase()
.replace("_", " "),
digits))
}
}
Err(_) => {
let float = value.parse::<f64>();
match float {
Ok(fvalue) => {
let whole = value.find('.').unwrap();
if value[..whole].len() == digits {
Ok(Some(Value::F64(fvalue)))
} else {
Err(format!("The {} field must be a number with {} digits.",
field.last()
.unwrap()
.to_lowercase()
.replace("_", " "),
digits))
}
}
Err(_) => {
Err(format!("The {} field must be a number with {} digits.",
field.last()
.unwrap()
.to_lowercase()
.replace("_", " "),
digits))
}
}
}
}
}
}
}
Some(&Value::U64(ref value)) => {
let mut count = 0;
let mut value = *value;
while value > 0 {
value /= 10;
count += 1;
}
if count == digits {
Ok(None)
} else {
Err(format!("The {} field must be a number with {} digits.",
field.last()
.unwrap()
.to_lowercase()
.replace("_", " "),
digits))
}
}
Some(&Value::I64(ref value)) => {
let mut count = 0;
let mut value = value.abs();
while value > 0 {
value /= 10;
count += 1;
}
if count == digits {
Ok(None)
} else {
Err(format!("The {} field must be a number with {} digits.",
field.last()
.unwrap()
.to_lowercase()
.replace("_", " "),
digits))
}
}
Some(&Value::F64(ref value)) => {
let mut count = 0;
let mut value = value.abs().floor() as usize;
while value > 0 {
value /= 10;
count += 1;
}
if count == digits {
Ok(None)
} else {
Err(format!("The {} field must be a number with {} digits.",
field.last()
.unwrap()
.to_lowercase()
.replace("_", " "),
digits))
}
}
None => {
// Allow empty values
Ok(None)
}
_ => {
Err(format!("The {} field must be a number with {} digits.",
field.last()
.unwrap()
.to_lowercase()
.replace("_", " "),
digits))
}
}
}