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use std::borrow;
use std::fmt;
use crate::reflection;
use crate::Predicate;
#[derive(Debug, Clone, PartialEq, Eq)]
pub struct DifferencePredicate {
orig: borrow::Cow<'static, str>,
}
impl Predicate<str> for DifferencePredicate {
fn eval(&self, edit: &str) -> bool {
edit == self.orig
}
fn find_case<'a>(&'a self, expected: bool, variable: &str) -> Option<reflection::Case<'a>> {
let result = variable != self.orig;
if result == expected {
None
} else {
let orig: Vec<_> = self.orig.lines().map(|l| format!("{}\n", l)).collect();
let variable: Vec<_> = variable.lines().map(|l| format!("{}\n", l)).collect();
let mut diff =
difflib::unified_diff(&orig, &variable, "value", "value", "expected", "actual", 0);
diff.insert(0, "\n".to_owned());
Some(
reflection::Case::new(Some(self), result).add_product(reflection::Product::new(
"diff",
itertools::join(diff.iter(), ""),
)),
)
}
}
}
impl reflection::PredicateReflection for DifferencePredicate {
fn parameters<'a>(&'a self) -> Box<dyn Iterator<Item = reflection::Parameter<'a>> + 'a> {
let params = vec![reflection::Parameter::new("original", &self.orig)];
Box::new(params.into_iter())
}
}
impl fmt::Display for DifferencePredicate {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "diff var original")
}
}
pub fn diff<S>(orig: S) -> DifferencePredicate
where
S: Into<borrow::Cow<'static, str>>,
{
DifferencePredicate { orig: orig.into() }
}