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use std::fmt::Display;
use num_traits::Num;
pub trait Filter: Display {}
pub enum NumericFilter<'a, T: Num> {
Eq(&'a str, T),
Ne(&'a str, T),
Lt(&'a str, T),
Gt(&'a str, T),
Le(&'a str, T),
Ge(&'a str, T),
}
impl<'a, T: Num + Display> Filter for NumericFilter<'a, T> {}
pub enum StringFilter<'a> {
Eq(&'a str, &'a str),
Ne(&'a str, &'a str),
}
impl<'a> Filter for StringFilter<'a> {}
impl<'a> Display for StringFilter<'a> {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
match self {
StringFilter::Eq(name, val) => {
write!(f, "filter(fn: (r) => r.{name} == \"{val}\")",)
}
StringFilter::Ne(name, val) => {
write!(f, "filter(fn: (r) => r.{name} != \"{val}\")",)
}
}
}
}
impl<'a, T: Num + Display> Display for NumericFilter<'a, T> {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
match self {
NumericFilter::Eq(name, val) => write!(f, "filter(fn: (r) => r.{name} == {val})"),
NumericFilter::Ne(name, val) => write!(f, "filter(fn: (r) => r.{name} != {val})"),
NumericFilter::Lt(name, val) => write!(f, "filter(fn: (r) => r.{name} < {val})"),
NumericFilter::Gt(name, val) => write!(f, "filter(fn: (r) => r.{name} > {val})"),
NumericFilter::Le(name, val) => write!(f, "filter(fn: (r) => r.{name} <= {val})"),
NumericFilter::Ge(name, val) => write!(f, "filter(fn: (r) => r.{name} >= {val})"),
}
}
}