polished-css-macros 0.1.0

Procedural macros which support the development of a library crate `polished-css`.
Documentation 
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use convert_case::{Case, Casing};
use proc_macro2::TokenStream;
use quote::quote;
use syn::{DeriveInput, Ident};

use crate::{
    derive::get_tuple_struct_field_type,
    utils::{has_syntax_reserved_keywords, DATA_TYPE_TRAIT_SUFFIX},
};

use super::{get_unit_options, UnitOptions};

pub fn create_trait(ast: &DeriveInput) -> TokenStream {
    let UnitOptions { trait_ident, .. } = get_unit_options(ast);
    let struct_ident = &ast.ident;
    let trait_ident = Ident::new(
        format!("{}{}", trait_ident, DATA_TYPE_TRAIT_SUFFIX).as_str(),
        struct_ident.span(),
    );
    let value_type_ident = get_tuple_struct_field_type(ast);
    let method_name = struct_ident.to_string().to_case(Case::Snake);
    let method_ident = if has_syntax_reserved_keywords(&method_name) {
        Ident::new_raw(&method_name, struct_ident.span())
    } else {
        Ident::new(&method_name, struct_ident.span())
    };

    let doc = format!(
        r#"
        Use a CSS unit `"{}"` _(`{}`)_ as value to store.

        ### Resources

        - [CSSWG specification](https://drafts.csswg.org/css-values/#{})
        "#,
        method_name, struct_ident, method_name
    );

    quote! {
        #[doc = #doc]
        pub trait #trait_ident: From<#struct_ident> {
            #[doc = #doc]
            fn #method_ident(value: #value_type_ident) -> Self
            where
                Self: Sized
            {
                Self::from(#struct_ident(value))
            }
        }
    }
}