.gitignore

@@ -18,5 +18,3 @@ Cargo.lock
 
 /target
 #Cargo.lock
-
-/.vscode

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "badcontext"
-version = "0.1.0"
+version = "0.1.0-SNAPSHOT"
 authors = ["brnrs <brnrs@brnrs.pl>"]
 edition = "2018"
 description = "A small crate for creating Context structs that contain application components"

src/component.rs

@@ -1,75 +0,0 @@
-use std::cell::RefCell;
-use std::ops::Deref;
-use std::rc::Rc;
-
-use super::context::Context;
-use super::error::{AlreadyRegisteredError, Error, NotRegisteredError};
-
-pub struct Component<T: 'static>(Rc<RefCell<T>>);
-
-impl<T: 'static> Component<T> {
-    pub fn from(t: T) -> Self {
-        Component(Rc::new(RefCell::new(t)))
-    }
-}
-
-impl<T: 'static> Deref for Component<T> {
-    type Target = RefCell<T>;
-
-    fn deref(&self) -> &Self::Target {
-        &self.0
-    }
-}
-
-impl<T: 'static> Clone for Component<T> {
-    fn clone(&self) -> Self {
-        Component(self.0.clone())
-    }
-}
-
-pub trait ContextComponentExtension {
-    fn get_component<T: 'static>(&self) -> Option<Component<T>>;
-
-    fn register_component<T: 'static>(
-        &mut self,
-        t: T,
-    ) -> Result<Component<T>, (AlreadyRegisteredError, T)>;
-
-    fn replace_component<T: 'static>(&self, t: T) -> Result<(Component<T>, T), (Error, T)>;
-}
-
-impl ContextComponentExtension for Context {
-    fn get_component<T: 'static>(&self) -> Option<Component<T>> {
-        self.get::<Component<T>>().cloned()
-    }
-
-    fn register_component<T: 'static>(
-        &mut self,
-        t: T,
-    ) -> Result<Component<T>, (AlreadyRegisteredError, T)> {
-        if self.get::<T>().is_none() {
-            let component = Component::from(t);
-            self.set(component.clone());
-            Ok(component)
-        } else {
-            Err((AlreadyRegisteredError::of_type::<Component<T>>(), t))
-        }
-    }
-
-    fn replace_component<T: 'static>(&self, mut t: T) -> Result<(Component<T>, T), (Error, T)> {
-        if let Some(component) = self.get_component::<T>() {
-            match component.try_borrow_mut() {
-                Err(borrow_mut_error) => return Err((Error::Borrowed(borrow_mut_error), t)),
-                Ok(mut ref_mut) => {
-                    std::mem::swap(&mut *ref_mut, &mut t);
-                    Ok((component.clone(), t))
-                }
-            }
-        } else {
-            Err((
-                Error::NotRegistered(NotRegisteredError::of_type::<Component<T>>()),
-                t,
-            ))
-        }
-    }
-}

src/context.rs

@@ -1,65 +0,0 @@
-use std::any::{Any, TypeId};
-use std::collections::HashMap;
-
-#[derive(Default)]
-pub struct Context {
-    container: HashMap<TypeId, Box<dyn Any>>,
-}
-
-impl Context {
-    pub fn get<T: 'static>(&self) -> Option<&T> {
-        self.container
-            .get(&TypeId::of::<T>())
-            .map(|boxed| boxed.downcast_ref().unwrap())
-    }
-
-    pub fn get_mut<T: 'static>(&mut self) -> Option<&mut T> {
-        self.container
-            .get_mut(&TypeId::of::<T>())
-            .map(|boxed| boxed.downcast_mut().unwrap())
-    }
-
-    pub fn set<T: 'static>(&mut self, t: T) {
-        self.container.insert(TypeId::of::<T>(), Box::from(t));
-    }
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    #[test]
-    fn test_set_and_get() {
-        // Given Context
-        let mut context = Context::default();
-        // And values
-        context.set(1_u32);
-        context.set(String::from("text"));
-
-        // When
-        let num: &u32 = context.get().unwrap();
-        let text: &String = context.get().unwrap();
-
-        // Then
-        assert_eq!(*num, 1);
-        assert_eq!(text, "text");
-    }
-
-    #[test]
-    fn test_set_and_get_mut() {
-        // Given Context
-        let mut context = Context::default();
-        // And values
-        context.set(1_u32);
-
-        // When
-        {
-            let num: &mut u32 = context.get_mut().unwrap();
-            *num = 2;
-        }
-        let num: &u32 = context.get().unwrap();
-
-        // Then
-        assert_eq!(*num, 2);
-    }
-}

src/error.rs

@@ -1,64 +0,0 @@
-use std::any::{type_name, TypeId};
-use std::cell::{BorrowError, BorrowMutError};
-use std::fmt::{Debug, Formatter, Result};
-
-#[derive(Debug)]
-pub enum Error {
-    AlreadyRegistered(AlreadyRegisteredError),
-    NotRegistered(NotRegisteredError),
-    BorrowedMutably(BorrowError),
-    Borrowed(BorrowMutError),
-    General(String),
-}
-
-pub struct AlreadyRegisteredError(TypeId, &'static str);
-
-impl AlreadyRegisteredError {
-    pub fn of_type<T: 'static>() -> Self {
-        AlreadyRegisteredError(TypeId::of::<T>(), type_name::<T>())
-    }
-
-    pub fn get_msg(&self) -> String {
-        format!("Element of type {} already registered", self.1)
-    }
-
-    pub fn get_type_name(&self) -> &'static str {
-        self.1
-    }
-
-    pub fn get_type_id(&self) -> &TypeId {
-        &self.0
-    }
-}
-
-impl Debug for AlreadyRegisteredError {
-    fn fmt(&self, f: &mut Formatter<'_>) -> Result {
-        f.write_str(&self.get_msg())
-    }
-}
-
-pub struct NotRegisteredError(TypeId, &'static str);
-
-impl NotRegisteredError {
-    pub fn of_type<T: 'static>() -> Self {
-        NotRegisteredError(TypeId::of::<T>(), type_name::<T>())
-    }
-
-    pub fn get_msg(&self) -> String {
-        format!("Element of type {} not registered", self.1)
-    }
-
-    pub fn get_type_name(&self) -> &'static str {
-        self.1
-    }
-
-    pub fn get_type_id(&self) -> &TypeId {
-        &self.0
-    }
-}
-
-impl Debug for NotRegisteredError {
-    fn fmt(&self, f: &mut Formatter<'_>) -> Result {
-        f.write_str(&self.get_msg())
-    }
-}

src/factory.rs

@@ -1,163 +0,0 @@
-use std::any::type_name;
-use std::fmt::{Debug, Formatter, Result as FmtResult};
-use std::ops::Deref;
-use std::rc::Rc;
-
-use super::component::{Component, ContextComponentExtension};
-use super::context::Context;
-use super::error::{AlreadyRegisteredError, Error, NotRegisteredError};
-
-pub trait FromContext<T: 'static> {
-    fn from_context(&self, context: &mut Context) -> Result<T, Error>;
-}
-
-impl<T: 'static, FN: Fn(&mut Context) -> Result<T, Error>> FromContext<T> for FN {
-    fn from_context(&self, context: &mut Context) -> Result<T, Error> {
-        self(context)
-    }
-}
-
-pub struct Factory<T: 'static>(Rc<dyn FromContext<T>>);
-
-impl<T: 'static> Debug for Factory<T> {
-    fn fmt(&self, f: &mut Formatter<'_>) -> FmtResult {
-        write!(f, "Factory for component of type {}", type_name::<T>())
-    }
-}
-
-impl<T: 'static> Factory<T> {
-    pub fn from<FC: FromContext<T> + 'static>(from_context: FC) -> Self {
-        Factory(Rc::new(from_context))
-    }
-}
-
-impl<T: 'static> Clone for Factory<T> {
-    fn clone(&self) -> Self {
-        Factory(self.0.clone())
-    }
-}
-
-impl<T: 'static> Deref for Factory<T> {
-    type Target = dyn FromContext<T>;
-
-    fn deref(&self) -> &Self::Target {
-        self.0.deref()
-    }
-}
-
-pub trait ContextFactoryExtension {
-    fn get_factory<T: 'static>(&self) -> Option<Factory<T>>;
-
-    fn register_factory<T: 'static>(
-        &mut self,
-        factory: Factory<T>,
-    ) -> Result<(), (AlreadyRegisteredError, Factory<T>)>;
-
-    fn replace_factory<T: 'static>(
-        &mut self,
-        factory: Factory<T>,
-    ) -> Result<Factory<T>, (NotRegisteredError, Factory<T>)>;
-
-    fn build<T: 'static>(&mut self) -> Result<T, Error>;
-
-    fn build_and_register_component<T: 'static>(&mut self) -> Result<Component<T>, Error>;
-
-    fn get_or_build_component<T: 'static>(&mut self) -> Result<Component<T>, Error>;
-}
-
-impl ContextFactoryExtension for Context {
-    fn get_factory<T: 'static>(&self) -> Option<Factory<T>> {
-        self.get().cloned()
-    }
-
-    fn register_factory<T: 'static>(
-        &mut self,
-        factory: Factory<T>,
-    ) -> Result<(), (AlreadyRegisteredError, Factory<T>)> {
-        if self.get::<Factory<T>>().is_none() {
-            self.set(factory);
-            Ok(())
-        } else {
-            Err((AlreadyRegisteredError::of_type::<Factory<T>>(), factory))
-        }
-    }
-
-    fn replace_factory<T: 'static>(
-        &mut self,
-        mut factory: Factory<T>,
-    ) -> Result<Factory<T>, (NotRegisteredError, Factory<T>)> {
-        match self.get_mut::<Factory<T>>() {
-            Some(mut_ref) => {
-                std::mem::swap(mut_ref, &mut factory);
-                Ok(factory)
-            }
-            None => Err((NotRegisteredError::of_type::<Factory<T>>(), factory)),
-        }
-    }
-
-    fn build<T: 'static>(&mut self) -> Result<T, Error> {
-        match self.get_factory::<T>() {
-            Some(factory) => factory.from_context(self),
-            None => Err(Error::NotRegistered(NotRegisteredError::of_type::<
-                Factory<T>,
-            >())),
-        }
-    }
-
-    fn build_and_register_component<T: 'static>(&mut self) -> Result<Component<T>, Error> {
-        if self.get_component::<T>().is_some() {
-            return Err(Error::AlreadyRegistered(AlreadyRegisteredError::of_type::<
-                Component<T>,
-            >()));
-        }
-        match self.build::<T>() {
-            Ok(t) => self
-                .register_component(t)
-                .map_err(|(error, _)| Error::AlreadyRegistered(error)),
-            Err(error) => Err(error),
-        }
-    }
-
-    fn get_or_build_component<T: 'static>(&mut self) -> Result<Component<T>, Error> {
-        if let Some(component) = self.get_component::<T>() {
-            Ok(component)
-        } else {
-            self.build_and_register_component()
-        }
-    }
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    #[test]
-    fn test_factory() {
-        // Given structs
-        #[derive(Debug)]
-        struct Config {
-            initial_count: u32,
-        };
-        #[derive(Debug)]
-        struct Counter(u32);
-        // and context
-        let mut context = Context::default();
-        // and factories registered in context
-        let config_factory = Factory::from(|_: &mut Context| Ok(Config { initial_count: 5 }));
-        context.register_factory(config_factory).unwrap();
-        let counter_factory = Factory::from(|context: &mut Context| {
-            let config_component = context.get_or_build_component::<Config>()?;
-            let initial_count = config_component.borrow().initial_count;
-            Ok(Counter(initial_count))
-        });
-        context.register_factory(counter_factory).unwrap();
-
-        // When
-        let counter_component = context.get_or_build_component::<Counter>().unwrap();
-        let config_component = context.get_component::<Config>().unwrap();
-
-        // Then
-        assert_eq!(counter_component.borrow().0, 5);
-        assert_eq!(config_component.borrow().initial_count, 5);
-    }
-}

src/lib.rs

@@ -1,4 +1,7 @@
-pub mod component;
-pub mod context;
-pub mod error;
-pub mod factory;
+#[cfg(test)]
+mod tests {
+    #[test]
+    fn it_works() {
+        assert_eq!(2 + 2, 4);
+    }
+}