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use crate::ir::{Attributes, Constant, Function, Identifier};
use proc_macro2::TokenStream;
use std::convert::{TryFrom, TryInto};
use syn::{parse2, ItemImpl};
#[derive(Debug, PartialEq, Clone)]
pub struct Implementation {
pub attributes: Attributes,
pub self_: Identifier,
pub items: Vec<ImplementationItem>,
}
#[derive(Debug, PartialEq, Clone)]
pub enum ImplementationItem {
Constant(Constant),
Method(Function),
}
impl TryFrom<TokenStream> for Implementation {
type Error = &'static str;
fn try_from(tokenstream: TokenStream) -> Result<Self, Self::Error> {
parse2::<ItemImpl>(tokenstream)
.map_err(|_| "Failed to parse to Implementation.")
.and_then(|item| item.try_into())
}
}
impl TryFrom<syn::ImplItem> for ImplementationItem {
type Error = &'static str;
fn try_from(impl_item: syn::ImplItem) -> Result<Self, Self::Error> {
match impl_item {
syn::ImplItem::Const(impl_item_const) => Ok(Self::Constant(impl_item_const.into())),
syn::ImplItem::Method(impl_item_method) => Ok(Self::Method(impl_item_method.into())),
_ => Err("Only Const and Method Impl items are currently supported"),
}
}
}
impl TryFrom<ItemImpl> for Implementation {
type Error = &'static str;
fn try_from(item_impl: ItemImpl) -> Result<Self, Self::Error> {
if let syn::Type::Path(syn::TypePath { path, .. }) = *item_impl.self_ty {
Ok(Self {
attributes: Attributes {
attributes: item_impl
.attrs
.into_iter()
.map(|x| x.parse_meta().expect("Failed to parse Meta").into())
.collect(),
},
self_: path.segments[0].ident.clone().into(),
items: item_impl
.items
.into_iter()
.map(|x| x.try_into().expect("Failed to convert from ImplItem"))
.collect(),
})
} else {
Err("Impl Block Identifier not found")
}
}
}
#[cfg(test)]
mod test {
use std::convert::TryFrom;
use super::{
Attributes, Constant, Function, Identifier, Implementation, ImplementationItem, ItemImpl,
};
use crate::ir::{Atomic, Attribute, Integer, Literal, Type};
use quote::quote;
use syn::parse_quote::parse;
#[test]
fn impl_block() {
assert_eq!(
Implementation::try_from(parse::<ItemImpl>(quote! {impl Test {}}))
.expect("Failed to convert from ItemImpl"),
Implementation {
attributes: Attributes { attributes: vec![] },
self_: Identifier::new("Test"),
items: vec![]
}
);
}
#[test]
fn impl_block_attributes() {
assert_eq!(
Implementation::try_from(parse::<ItemImpl>(quote! {
#[test(a = "b")]
impl Test {}
}))
.expect("Failed to convert from ItemImpl"),
Implementation {
attributes: Attributes {
attributes: vec![Attribute::Group(
Identifier::new("test"),
Attributes {
attributes: vec![Attribute::Named(
Identifier::new("a"),
Literal::String(String::from("b"))
)]
}
)]
},
self_: Identifier::new("Test"),
items: vec![]
}
);
}
#[test]
fn impl_block_items_const() {
assert_eq!(
Implementation::try_from(parse::<ItemImpl>(quote! {
impl Test {
const a: i32 = 2;
}
}))
.expect("Failed to convert from ItemImpl"),
Implementation {
attributes: Attributes { attributes: vec![] },
self_: Identifier::new("Test"),
items: vec![ImplementationItem::Constant(Constant {
identifier: Identifier::new("a"),
type_: Type::Atomic(Atomic::Integer(Integer::I32)),
literal: Literal::Integer(2)
})]
}
);
}
#[test]
fn impl_block_items_method() {
assert_eq!(
Implementation::try_from(parse::<ItemImpl>(quote! {
impl Test {
fn a(){}
}
}))
.expect("Failed to convert from ItemImpl"),
Implementation {
attributes: Attributes { attributes: vec![] },
self_: Identifier::new("Test"),
items: vec![ImplementationItem::Method(Function {
attributes: Attributes { attributes: vec![] },
asyncness: None,
identifier: Identifier::new("a"),
inputs: vec![],
output: None
})]
}
);
}
#[test]
fn impl_block_items() {
assert_eq!(
Implementation::try_from(parse::<ItemImpl>(quote! {
impl Test {
const a: i32 = 2;
fn b(){}
}
}))
.expect("Failed to convert from ItemImpl"),
Implementation {
attributes: Attributes { attributes: vec![] },
self_: Identifier::new("Test"),
items: vec![
ImplementationItem::Constant(Constant {
identifier: Identifier::new("a"),
type_: Type::Atomic(Atomic::Integer(Integer::I32)),
literal: Literal::Integer(2)
}),
ImplementationItem::Method(Function {
attributes: Attributes { attributes: vec![] },
asyncness: None,
identifier: Identifier::new("b"),
inputs: vec![],
output: None
})
]
}
);
}
}