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use derive_more::{Display, From, Into};
#[derive(Debug, Clone, Hash, PartialEq, Eq, From, Into, Display)]
pub struct RawValue(pub String);
impl RawValue {
pub fn parse_bool(&self) -> Parsed<bool> {
match self.0.trim().to_lowercase().as_ref() {
"" => Parsed::Missing,
"1" | "t" => Parsed::Some(true),
"0" | "f" => Parsed::Some(false),
otherwise => otherwise
.parse()
.map(Parsed::Some)
.unwrap_or(Parsed::Invalid),
}
}
pub fn parse_i64(&self) -> Parsed<i64> {
match self.0.trim() {
"" => Parsed::Missing,
otherwise => otherwise
.parse()
.map(Parsed::Some)
.unwrap_or(Parsed::Invalid),
}
}
pub fn parse_f64(&self) -> Parsed<f64> {
match self.0.trim().to_lowercase().as_ref() {
"" => Parsed::Missing,
"nan" => Parsed::Some(f64::NAN),
otherwise => otherwise
.parse()
.map(Parsed::Some)
.unwrap_or(Parsed::Invalid),
}
}
}
impl From<&str> for RawValue {
fn from(s: &str) -> Self {
s.to_string().into()
}
}
#[derive(Clone, Copy, Hash, PartialEq, Eq, Debug)]
pub enum Parsed<A> {
Invalid,
Missing,
Some(A),
}
impl<T> Parsed<T> {
pub fn get(self) -> Option<T> {
match self {
Parsed::Missing => None,
Parsed::Invalid => None,
Parsed::Some(x) => Some(x),
}
}
pub fn or_else(self, op: impl FnOnce() -> Parsed<T>) -> Parsed<T> {
match self {
Parsed::Missing => op(),
Parsed::Invalid => op(),
some => some,
}
}
pub fn unwrap_or_else(self, op: impl FnOnce() -> T) -> T {
match self {
Parsed::Missing => op(),
Parsed::Invalid => op(),
Parsed::Some(t) => t,
}
}
pub fn map<U>(self, op: impl FnOnce(T) -> U) -> Parsed<U> {
match self {
Parsed::Missing => Parsed::Missing,
Parsed::Invalid => Parsed::Invalid,
Parsed::Some(t) => Parsed::Some(op(t)),
}
}
pub fn is_some(&self) -> bool {
matches!(self, Parsed::Some(_))
}
}