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use std::ffi;
use std::fmt;
use std::str;
use Predicate;
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub struct TrimPredicate<P>
where
P: Predicate<str>,
{
p: P,
}
impl<P> Predicate<str> for TrimPredicate<P>
where
P: Predicate<str>,
{
fn eval(&self, variable: &str) -> bool {
self.p.eval(variable.trim())
}
}
impl<P> fmt::Display for TrimPredicate<P>
where
P: Predicate<str>,
{
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "{}", self.p)
}
}
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub struct Utf8Predicate<P>
where
P: Predicate<str>,
{
p: P,
}
impl<P> Predicate<ffi::OsStr> for Utf8Predicate<P>
where
P: Predicate<str>,
{
fn eval(&self, variable: &ffi::OsStr) -> bool {
variable.to_str().map(|s| self.p.eval(s)).unwrap_or(false)
}
}
impl<P> Predicate<[u8]> for Utf8Predicate<P>
where
P: Predicate<str>,
{
fn eval(&self, variable: &[u8]) -> bool {
str::from_utf8(variable)
.map(|s| self.p.eval(s))
.unwrap_or(false)
}
}
impl<P> fmt::Display for Utf8Predicate<P>
where
P: Predicate<str>,
{
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "{}", self.p)
}
}
pub trait PredicateStrExt
where
Self: Predicate<str>,
Self: Sized,
{
fn trim(self) -> TrimPredicate<Self> {
TrimPredicate { p: self }
}
fn from_utf8(self) -> Utf8Predicate<Self> {
Utf8Predicate { p: self }
}
}
impl<P> PredicateStrExt for P
where
P: Predicate<str>,
{
}