rsbind 0.6.0

Provide tools to bind rust trait with other language and export library artifact directly. Invoke rust functions just like you write it in native language.
Documentation 
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use proc_macro2::TokenStream;
use rstgen::swift::Swift;
use rstgen::{swift, Tokens};

use crate::ast::types::AstType;
use crate::base::lang::{Convertible, Direction};
use crate::ident;

pub(crate) struct Bool {}

impl Bool {}

impl<'a> Convertible<Swift<'a>> for Bool {
    fn native_to_transferable(
        &self,
        origin: String,
        _direction: Direction,
    ) -> Tokens<'static, Swift<'a>> {
        toks_f!("{} ? Int32(1) : Int32(0)", origin)
    }

    fn transferable_to_native(
        &self,
        origin: String,
        _direction: Direction,
    ) -> Tokens<'static, Swift<'a>> {
        toks_f!("{} > 0 ? true : false", origin)
    }

    fn rust_to_transferable(&self, origin: TokenStream, _direction: Direction) -> TokenStream {
        quote! {
            if #origin {1} else {0}
        }
    }

    fn transferable_to_rust(&self, origin: TokenStream, _direction: Direction) -> TokenStream {
        quote! {
            if #origin > 0 {true} else {false}
        }
    }

    fn native_type(&self) -> Swift<'a> {
        swift::BOOLEAN
    }

    fn native_transferable_type(&self, _direction: Direction) -> Swift<'a> {
        swift::local("Int32")
    }

    fn rust_transferable_type(&self, _direction: Direction) -> TokenStream {
        quote! {i32}
    }

    fn quote_common_in_bridge(&self) -> TokenStream {
        quote! {}
    }

    fn quote_common_in_native(&self) -> Tokens<'static, Swift<'a>> {
        Tokens::new()
    }

    fn quote_in_common_rs(&self) -> TokenStream {
        quote! {}
    }
}

pub(crate) struct Basic {
    pub(crate) ty: AstType,
}

impl Basic {
    fn native_type_str(&self) -> String {
        match self.ty.clone() {
            AstType::Void => "()",
            AstType::Byte(_) => "Int8",
            AstType::Short(_) => "Int16",
            AstType::Int(_) => "Int32",
            AstType::Long(_) => "Int64",
            AstType::Float(_) => "Float32",
            AstType::Double(_) => "Float64",
            _ => panic!("Error type found."),
        }
        .to_string()
    }
}

impl<'a> Convertible<Swift<'a>> for Basic {
    fn native_to_transferable(
        &self,
        origin: String,
        _direction: Direction,
    ) -> Tokens<'static, Swift<'a>> {
        toks_f!("{}({})", self.native_type_str(), origin)
    }

    fn transferable_to_native(
        &self,
        origin: String,
        _direction: Direction,
    ) -> Tokens<'static, Swift<'a>> {
        toks_f!("{}({})", self.native_type_str(), origin)
    }

    fn rust_to_transferable(&self, origin: TokenStream, direction: Direction) -> TokenStream {
        let ty_ident = self.rust_transferable_type(direction);
        quote! {
            #origin as #ty_ident
        }
    }

    fn transferable_to_rust(&self, origin: TokenStream, _direction: Direction) -> TokenStream {
        let origin_type_ident = ident!(&self.ty.origin());
        quote! {
            #origin as #origin_type_ident
        }
    }

    fn native_type(&self) -> Swift<'a> {
        swift::local(self.native_type_str())
    }

    fn native_transferable_type(&self, _direction: Direction) -> Swift<'a> {
        swift::local(self.native_type_str())
    }

    fn rust_transferable_type(&self, _direction: Direction) -> TokenStream {
        match self.ty.clone() {
            AstType::Byte(_) => quote!(i8),
            AstType::Short(_) => quote!(i16),
            AstType::Int(_) => quote!(i32),
            AstType::Long(_) => quote!(i64),
            AstType::Float(_) => quote!(f32),
            AstType::Double(_) => quote!(f64),
            _ => quote! {},
        }
    }

    fn quote_common_in_bridge(&self) -> TokenStream {
        quote! {}
    }

    fn quote_common_in_native(&self) -> Tokens<'static, Swift<'a>> {
        Tokens::new()
    }

    fn quote_in_common_rs(&self) -> TokenStream {
        quote! {}
    }
}

pub(crate) fn quote_free_swift_ptr(ty: &str) -> Tokens<'static, Swift<'static>> {
    let mut t = Tokens::new();
    push_f!(
        t,
        "let free_ptr : @convention(c) (UnsafeMutablePointer<{}>?, Int32, Int32) -> () = {{",
        ty
    );
    nested_f!(t, |tt| {
        nested_f!(tt, "(ptr, count, capacity) in");
        nested_f!(tt, "ptr?.deinitialize(count: Int(capacity))");
        nested_f!(tt, "ptr?.deallocate()");
    });
    push_f!(t, "}");
    t
}