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use std::fmt;
use std::fs;
use std::io::{self, Read};
use std::path;
use reflection;
use Predicate;
fn read_file(path: &path::Path) -> io::Result<Vec<u8>> {
let mut buffer = Vec::new();
fs::File::open(path)?.read_to_end(&mut buffer)?;
Ok(buffer)
}
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub struct FileContentPredicate<P>
where
P: Predicate<[u8]>,
{
p: P,
}
impl<P> FileContentPredicate<P>
where
P: Predicate<[u8]>,
{
fn eval(&self, path: &path::Path) -> io::Result<bool> {
let buffer = read_file(path)?;
Ok(self.p.eval(&buffer))
}
}
impl<P> reflection::PredicateReflection for FileContentPredicate<P>
where
P: Predicate<[u8]>,
{
fn children<'a>(&'a self) -> Box<Iterator<Item = reflection::Child<'a>> + 'a> {
let params = vec![reflection::Child::new("predicate", &self.p)];
Box::new(params.into_iter())
}
}
impl<P> fmt::Display for FileContentPredicate<P>
where
P: Predicate<[u8]>,
{
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "{}", self.p)
}
}
impl<P> Predicate<path::Path> for FileContentPredicate<P>
where
P: Predicate<[u8]>,
{
fn eval(&self, path: &path::Path) -> bool {
self.eval(path).unwrap_or(false)
}
fn find_case<'a>(
&'a self,
expected: bool,
variable: &path::Path,
) -> Option<reflection::Case<'a>> {
let buffer = read_file(variable);
match (expected, buffer) {
(_, Ok(buffer)) => self.p
.find_case(expected, &buffer)
.map(|child| reflection::Case::new(Some(self), expected).add_child(child)),
(true, Err(_)) => None,
(false, Err(err)) => Some(
reflection::Case::new(Some(self), false)
.add_product(reflection::Product::new("error", err)),
),
}
}
}
pub trait PredicateFileContentExt
where
Self: Predicate<[u8]>,
Self: Sized,
{
fn from_file_path(self) -> FileContentPredicate<Self> {
FileContentPredicate { p: self }
}
}
impl<P> PredicateFileContentExt for P
where
P: Predicate<[u8]>,
{
}