# rust-fel

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An experimental front end library which relies on [rustwasm](https://github.com/rustwasm).

Very lightweight and does not support much of the [HTML Standard](https://html.spec.whatwg.org/). More work needs to be done to truly make this a viable option for creating client side front-ends with [rustwasm](https://github.com/rustwasm).

A working example can be found here [rust-fel-example](https://github.com/tostaylo/rust-fel-example)

## Features

- State Management
- [JSX](https://github.com/facebook/jsx) -like syntax
- [DOM](https://developer.mozilla.org/en-US/docs/Web/API/Document_Object_Model/Introduction) construction from a Virtual [DOM](https://developer.mozilla.org/en-US/docs/Web/API/Document_Object_Model/Introduction).

## Use

```
use crate::main_component::Main;
use wasm_bindgen::prelude::_;
extern crate rust_fel;

// invoked when the wasm module is instantiated
#[wasm_bindgen(start)]
pub fn main() -> Result<(), JsValue> {
  let main = Main::create();
  let app = rust_fel::App::new(main);
  app.mount("root");

  Ok(())
}
```

### Examples

A`rust_fel` [struct](https://doc.rust-lang.org/std/keyword.struct.html) component implements [rust_fel::Component](https://docs.rs/rust-fel/0.1.0/rust_fel/component/index.html)

```
use crate::action::Action;
use crate::handle;
use crate::main_child::{ChildProps, MainChild};
use std::cell::RefCell;
use std::rc::Rc;

#[derive(Debug, Default, Clone)]
pub struct MainState {
  count: i32,
}

pub enum Actions {
  Counter(Action),
}

#[derive(Debug, Default, Clone)]
pub struct Main {
  child: handle::Handle<MainChild>,
  id: String,
  state: MainState,
  props: String,
}

impl Main {
  pub fn create() -> handle::Handle<Self> {
    let main = Main {
      id: "main".to_owned(),
      state: MainState {
      count: 0,
      },
      child: MainChild::create(),
      ..Default::default()
    };
    handle::Handle(Rc::new(RefCell::new(main)))
  }
}

impl rust_fel::Component for handle::Handle<Main> {
  type Properties = String;
  type Message = Actions;
  type State = MainState;

  fn add_props(&mut self, props: Self::Properties) {
    self.0.borrow_mut().props = props;
  }

  fn reduce_state(&mut self, message: Actions) {
    match message {
      Actions::Counter(Action::Increment) => self.0.borrow_mut().state.count += 100,
      Actions::Counter(Action::Decrement) => self.0.borrow_mut().state.count -= 100,
    }
    rust_fel::re_render(self.render(), Some(self.0.borrow().id.clone()));
  }

  fn render(&self) -> rust_fel::Element {
    let mut clone_for_props_closure = self.clone();
    let mut clone_for_inc = self.clone();
    let mut borrow = self.0.borrow_mut();
    let state = borrow.state.clone();
    let props_closure = Rc::new(RefCell::new(move || {
      clone_for_props_closure.reduce_state(Actions::Counter(Action::Decrement))
    }));

    let child_props = ChildProps {
      counter_props: state.count.to_string(),
      closure: Some(props_closure),
    };

    borrow.child.add_props(child_props);

    let main_text = rust_fel::html(format!(
      "<span | data-cy=main-text| >Main {}</span>",
      state.count.to_string()
      ));

    let inc_button = rust_fel::Element::new(
      "button".to_owned(),
      rust_fel::Props {
        text: Some("Increment".to_owned()),
        on_click: Some(Box::new(move || {
        clone_for_inc.reduce_state(Actions::Counter(Action::Increment))
        })),
        data_cy: Some("increment-main".to_owned()),
        children: Some(vec![inc_button_text]),
        ..Default::default()
        },
      );

    let main_el = rust_fel::Element::new(
      "div".to_owned(),
      rust_fel::Props {
        class_name: Some("main-el".to_owned()),
        children: Some(vec![main_text, inc_button, input_wrapper]),
        ..Default::default()
        },
      );

    let child_wrapper = rust_fel::Element::new(
      "div".to_owned(),
      rust_fel::Props {
        class_name: Some("child-wrapper".to_owned()),
        children: Some(vec![borrow.child.render()]),
        ..Default::default()
        },
      );

    rust_fel::Element::new(
      "div".to_owned(),
      rust_fel::Props {
        id: Some(borrow.id.clone()),
        class_name: Some("main".to_owned()),
        children: Some(vec![main_el, child_wrapper]),
        ..Default::default()
        },
      )
    }
}
```

A `rust_fel` functional component with [rust_fel::html](https://docs.rs/rust-fel/0.1.0/rust_fel/rsx/fn.html.html).

```
  pub fn theme_switcher(on_click: rust_fel::ClosureProp, title: String) -> rust_fel::Element {
    let text = rust_fel::html(format!(
      "<span |class=theme-switcher-text|>{}</span>",
      title
  ));

  let theme_button = rust_fel::Element::new(
    "button".to_owned(),
    rust_fel::Props {
      on_click: Some(on_click),
      type_attr: Some("button".to_owned()),
      class_name: Some("theme-switcher-button".to_owned()),
      children: Some(vec![text]),
      data_cy: Some(title),
      ..Default::default()
      },
    );

  rust_fel::Element::new(
    "li".to_owned(),
    rust_fel::Props {
      children: Some(vec![theme_button]),
      ..Default::default()
      },
    )
}
```