Created
March 28, 2017 12:33
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use std::fmt::Debug; | |
trait Atom: Debug { | |
fn render(&self); | |
} | |
#[derive(Debug)] | |
struct TextAtom { | |
value: String | |
} | |
impl Atom for TextAtom { | |
fn render(&self) { | |
println!("Rendering text {}", self.value); | |
} | |
} | |
#[derive(Debug)] | |
enum RenderResult { | |
Components(Vec<Box<Component>>), | |
Atom(Box<Atom>), | |
} | |
trait Component: Debug { | |
fn render(&self) -> RenderResult; | |
} | |
#[derive(Debug)] | |
struct TextComponent { | |
value: String, | |
} | |
impl Component for TextComponent { | |
fn render(&self) -> RenderResult { | |
RenderResult::Atom(Box::new(TextAtom {value: self.value.clone()})) | |
} | |
} | |
#[derive(Debug)] | |
struct NameComponent { | |
name: String, | |
} | |
impl Component for NameComponent { | |
fn render(&self) -> RenderResult { | |
RenderResult::Components(vec![ | |
Box::new(TextComponent { value: "Hello".to_string() }), | |
Box::new(TextComponent { value: self.name.clone() }), | |
]) | |
} | |
} | |
fn render_component(component: &Component, atoms: &mut Vec<Box<Atom>>) { | |
match component.render() { | |
RenderResult::Components(components) => { | |
for component in components { | |
render_component(&*component, atoms); | |
} | |
} | |
RenderResult::Atom(atom) => { | |
atoms.push(atom); | |
} | |
} | |
} | |
fn main() { | |
let component = NameComponent { | |
name: "Karl".to_string(), | |
}; | |
let mut atoms = Vec::new(); | |
render_component(&component, &mut atoms); | |
for atom in atoms { | |
atom.render(); | |
} | |
} |
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