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|
//! Dependency history.
use std::any::type_name;
use std::collections::HashSet;
use std::fmt::{Debug, Display};
const BOLD_MODE: &str = "\x1b[1m";
const RESET_BOLD_MODE: &str = "\x1b[22m";
/// Dependency history interface.
///
/// **This trait is sealed and cannot be implemented for types outside this crate.**
pub trait IDependencyHistory: private::Sealed
{
#[doc(hidden)]
fn push<Dependency: 'static + ?Sized>(&mut self);
#[doc(hidden)]
fn contains<Dependency: 'static + ?Sized>(&self) -> bool;
}
/// Dependency history.
#[derive(Clone, Debug)]
pub struct DependencyHistory
{
inner: Vec<&'static str>,
}
impl DependencyHistory
{
#[must_use]
pub(crate) fn new() -> Self
{
Self { inner: vec![] }
}
}
impl IDependencyHistory for DependencyHistory
{
#[doc(hidden)]
fn push<Dependency: 'static + ?Sized>(&mut self)
{
self.inner.push(type_name::<Dependency>());
}
#[doc(hidden)]
fn contains<Dependency: 'static + ?Sized>(&self) -> bool
{
self.inner.contains(&type_name::<Dependency>())
}
}
impl Display for DependencyHistory
{
fn fmt(&self, formatter: &mut std::fmt::Formatter<'_>) -> std::fmt::Result
{
let mut found_items = HashSet::new();
let opt_dupe_item = self.inner.iter().find(|item| {
if found_items.contains(item) {
return true;
}
found_items.insert(*item);
false
});
for (index, item) in self.inner.iter().enumerate() {
let mut item_is_dupe = false;
if let Some(dupe_item) = opt_dupe_item {
if *item == *dupe_item {
formatter
.write_fmt(format_args!("{BOLD_MODE}{item}{RESET_BOLD_MODE}"))?;
item_is_dupe = true;
}
}
if !item_is_dupe {
formatter.write_str(item)?;
}
if index != self.inner.len() - 1 {
formatter.write_str(" -> ")?;
}
}
if opt_dupe_item.is_some() {
formatter.write_str(" -> ...")?;
}
Ok(())
}
}
impl Default for DependencyHistory
{
fn default() -> Self
{
Self::new()
}
}
impl private::Sealed for DependencyHistory {}
pub(crate) mod private
{
pub trait Sealed {}
}
#[cfg(test)]
mod tests
{
use super::*;
use crate::test_utils::subjects;
#[test]
fn can_push()
{
let mut dependency_history = DependencyHistory::new();
dependency_history.push::<dyn subjects::INumber>();
assert!(dependency_history
.inner
.contains(&type_name::<dyn subjects::INumber>()));
}
#[test]
fn contains_works()
{
let mut dependency_history = DependencyHistory::new();
dependency_history
.inner
.push(type_name::<dyn subjects::IUserManager>());
assert!(dependency_history.contains::<dyn subjects::IUserManager>());
assert!(!dependency_history.contains::<dyn subjects::INumber>());
}
#[test]
fn display_works()
{
trait Ninja {}
trait Katana {}
trait Blade {}
let mut dependency_history = DependencyHistory::new();
dependency_history.inner.push(type_name::<dyn Ninja>());
dependency_history.inner.push(type_name::<dyn Katana>());
dependency_history.inner.push(type_name::<dyn Blade>());
assert_eq!(
dependency_history.to_string(),
format!(
"{} -> {} -> {}",
type_name::<dyn Ninja>(),
type_name::<dyn Katana>(),
type_name::<dyn Blade>()
)
);
dependency_history.inner.push(type_name::<dyn Katana>());
assert_eq!(
dependency_history.to_string(),
format!(
concat!(
"{} -> {bold_mode}{}{reset_bold_mode} -> {} -> ",
"{bold_mode}{}{reset_bold_mode} -> ...",
),
type_name::<dyn Ninja>(),
type_name::<dyn Katana>(),
type_name::<dyn Blade>(),
type_name::<dyn Katana>(),
bold_mode = BOLD_MODE,
reset_bold_mode = RESET_BOLD_MODE
)
);
}
}
|
