rusty-css

a rusty way to implement css in rust

rusty-css offers a solution to create and export css styles in a familiar way, but without leaving the rust syntax. You can access and manipulate every value you define on an individual basis.

The identifiers are taken as-is and converted into strings, with the exception of the underscore token (_), which is converted into the minus token (-) when the struct is to be converted into its corresponding css values.

Example:

rust struct A { css_property: "css value" } will be converted into rust "css-property: css value"

regardless of the property names' or values' validity. If you have an error in your css, it will still compile!

Roadmap

• [x] rendering rust structs to inline css code
  • [x] support for deep nesting
• [x] setting the values of a struct from inline css
• [ ] more reliable extraction of numeric values inside of a String
• [x] support for classes
  • [ ] support for queries
• [ ] validating the written css code at compile time
  • [ ] automated implementation of a default style struct according to the css spec
• [ ] second layer implementation of a system with strict typing (such as enums for all possible units for a given property)
• [ ] more abstraction for less boilderplate

How to use

As of now this crate uses the bevy_reflect crate to convert the structs into css "property: value" strings, so all structs that you wish to convert must derive Reflect

```rust use bevy_reflect::{Reflect};

[derive(Reflect)]

struct ExampleStruct { width: String, height: String, background: String, transform: String, } ```

to convert this struct into an inline css string we have to first implement the struct and its initial state. For this we implement the Style Trait from this crate.

```rust use rusty_css::*;

impl Style for ExampleStruct { fn create() -> Self { // return an instance of Self, so in this case an instance of ExampleStruct Self { width: "4em".tostring(), height: "2rem".tostring(), background: "rgb(69,13,37)".tostring(), transform: "skewX(20deg) skewY(30deg)".tostring(), } } } ```

now we can create an instance of ExampleStruct and convert it into a css inline string.

```rust

let examplestruct = ExampleStruct::create(); let inlinecss: String = example_struct.inline(); // "width: 4em; height: 2rem; background: rgb(69,13,37); transform: skewX(20deg) skewY(30deg);" ```

Developer experiance improvements

since it ca be hard to access values of a property that can take multiple values such as transform, we can instead implement a nested struct into our original struct. By doing so, the fields of the struct in the second layer will no longer be treated as if they're css properties but rather css fuctions that take an argument.

```rust

[allow(nonsnakecase)] // so the skewX field doesn't throw a warning for being in snake case, which css uses

[derive(Reflect)]

struct NestedTransformStruct { skewX: String, skewY: String, }

[derive(Reflect)]

struct ExampleStruct { width: String, height: String, background: String, transform: NestedTransformStruct, }

impl Style for ExampleStruct { fn create() -> Self { // return an instance of Self, so in this case an instance of ExampleStruct Self { width: "4em".tostring(), height: "2rem".tostring(), background: "rgb(69,13,37)".tostring(), transform: NestedTransformStruct { skewX: "20deg".tostring(), skewY: "30deg".to_string(), }, } } }

let examplestruct = ExampleStruct::create(); let inlinecss: String = examplestruct.inline(); let skewX: String = examplestruct.transform.skewX; // can access this field, wuhu! // "width: 4em; height: 2rem; background: rgb(69,13,37); transform: skewX(20deg) skewY(30deg);" ``` The output is equivalend but whe can access the elements skewX and skewY fields individually now. Following that logic, you should be able to write the background fields value similarly, so lets try it:

```rust

[derive(Reflect)]

struct Background { rgb: String, }

[derive(Reflect)]

struct ExampleStruct { width: String, height: String, background: Background, }

impl Style for ExampleStruct { fn create() -> Self { // return an instance of Self, so in this case an instance of ExampleStruct Self { width: "4em".tostring(), height: "2rem".tostring(), background: Background { rgb: "69,13,37".to_string(), } } } }

let examplestruct = ExampleStruct::create(); let inlinecss: String = example_struct.inline(); // "width: 4em; height: 2rem; background: rgb(69,13,37);" ``` Works just fine!

You might have noticed that we're appending a lot of .tostring() calls. At scale this can become quite cumbersome, so i created the appendto_string crate, which helps with that.

Complete Example

with all that out of the way, here's what your code might look like:

```rust use rustycss::*; use appendtostring::*; use bevyreflect::{Reflect};

// define all the structs we want to be css-ified

[allow(nonsnakecase)]

[derive(Reflect)]

struct NestedTransformStruct { skewX: String, skewY: String, }

[derive(Reflect)]

struct ExampleStruct { width: String, height: String, background: String, transform: NestedTransformStruct, }

impl Style for ExampleStruct { fn create() -> Self { // return an instance of Self, so in this case an instance of ExampleStruct appendtostring!( Self { width: "4em", height: "2rem", background: "rgb(69,13,37)", transform: NestedTransformStruct { skewX: "20deg", skewY: "30deg", }, } ) } }

let examplestruct = ExampleStruct::create(); let inlinecss: String = example_struct.inline(); // "width: 4em; height: 2rem; background: rgb(69,13,37); transform: skewX(20deg) skewY(30deg);" ```

Implementing Styles as Classes

Use the .as_class() function on your struct to export its style into the <style> tag of your app. For now you'll have to pass it a reference to the web_sys::Document you want to export the style into like so: ```rust let style_struct = ExampleStruct::create();

// grab the current document let window = web_sys::window().expect("No global window found"); let document = window.document().expect("couldn't get `document");

// export the style to the