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Initial implementation of node graph based on structs

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TrueDoctor 2021-07-07 13:05:52 +02:00 • committed by Keavon Chambers
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**/target

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[package]
name = "graph-ite"
version = "0.1.0"
edition = "2018"
# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
[features]
rust_analyzer = ["ide", "ide_db"]
[dependencies]
ide = { version = "*", package = "ra_ap_ide", optional = true }
ide_db = { version = "*", package = "ra_ap_ide_db" , optional = true }
graph-proc-macros = {path = "proc-macro"}

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# NodeGraphExperiments
Repo for testing ideas for the upcoming Graphite node graph implementation

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# This file is automatically @generated by Cargo.
# It is not intended for manual editing.
version = 3
[[package]]
name = "graph-proc-macros"
version = "0.1.0"
dependencies = [
"proc-macro2",
"quote",
"syn",
]
[[package]]
name = "proc-macro2"
version = "1.0.27"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "f0d8caf72986c1a598726adc988bb5984792ef84f5ee5aa50209145ee8077038"
dependencies = [
"unicode-xid",
]
[[package]]
name = "quote"
version = "1.0.9"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "c3d0b9745dc2debf507c8422de05d7226cc1f0644216dfdfead988f9b1ab32a7"
dependencies = [
"proc-macro2",
]
[[package]]
name = "syn"
version = "1.0.73"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "f71489ff30030d2ae598524f61326b902466f72a0fb1a8564c001cc63425bcc7"
dependencies = [
"proc-macro2",
"quote",
"unicode-xid",
]
[[package]]
name = "unicode-xid"
version = "0.2.2"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "8ccb82d61f80a663efe1f787a51b16b5a51e3314d6ac365b08639f52387b33f3"

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[package]
name = "graph-proc-macros"
version = "0.1.0"
authors = ["Graphite Authors <contact@graphite.design>"]
edition = "2018"
publish = false
[lib]
path = "src/lib.rs"
proc-macro = true
[dependencies]
proc-macro2 = "1.0.26"
syn = { version = "1.0.68", features = ["full"] }
quote = "1.0.9"

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use proc_macro::TokenStream;
use quote::{quote, ToTokens};
use syn::punctuated::Punctuated;
use syn::{parse_macro_input, FnArg, ItemFn, Pat, Type};
fn extract_type(a: FnArg) -> Box<Type> {
match a {
FnArg::Typed(p) => p.ty, // notice `ty` instead of `pat`
_ => panic!("Not supported on types with `self`!"),
}
}
fn extract_arg_types(fn_args: Punctuated<FnArg, syn::token::Comma>) -> Vec<Box<Type>> {
return fn_args.into_iter().map(extract_type).collect::<Vec<_>>();
}
fn extract_arg_idents(fn_args: Punctuated<FnArg, syn::token::Comma>) -> Vec<Box<Pat>> {
return fn_args.into_iter().map(extract_arg_pat).collect::<Vec<_>>();
}
fn extract_arg_pat(a: FnArg) -> Box<Pat> {
match a {
FnArg::Typed(p) => p.pat,
_ => panic!("Not supported on types with `self`!"),
}
}
#[proc_macro_attribute] // 2
pub fn to_node(_attr: TokenStream, item: TokenStream) -> TokenStream {
let string = item.to_string();
let item2 = item.clone();
let parsed = parse_macro_input!(item2 as ItemFn); // 3
//item.extend(generate_to_string(parsed, string)); // 4
//item
generate_to_string(parsed, string)
}
fn generate_to_string(parsed: ItemFn, string: String) -> TokenStream {
let whole_function = parsed.clone();
//let fn_body = parsed.block; // function body
let sig = parsed.sig; // function signature
//let vis = parsed.vis; // visibility, pub or not
let generics = sig.generics;
let fn_args = sig.inputs; // comma separated args
let fn_return_type = sig.output; // return type
let fn_name = sig.ident; // function name/identifier
let idents = extract_arg_idents(fn_args.clone());
let types = extract_arg_types(fn_args);
let types = types.iter().map(|t| t.to_token_stream()).collect::<Vec<_>>();
let idents = idents.iter().map(|t| t.to_token_stream()).collect::<Vec<_>>();
let node_fn_name = syn::Ident::new(&(fn_name.to_string() + "_node"), proc_macro2::Span::call_site()); // function name/identifier
let return_type_string = fn_return_type.to_token_stream().to_string().replace("->","");
let arg_type_string = types.iter().map(|t|t.to_string()).collect::<Vec<_>>().join(", ");
let error = format!("called {} with the wrong type", fn_name.to_string());
let x = quote! {
//#whole_function
fn #node_fn_name #generics() -> Node {
Node { func: Box::new(move |x| {
let args = x.downcast::<(#(#types,)*)>().expect(#error);
let (#(#idents,)*) = *args;
#whole_function
Box::new(#fn_name(#(#idents,)*))
}),
code: #string.to_string(),
return_type: #return_type_string.trim().to_string(),
args: format!("({})",#arg_type_string.trim()),
}
}
};
//panic!("{}\n{:?}", x.to_string(), x);
x.into()
}

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use std::any::Any;
type Function = Box<dyn Fn(Box<dyn Any>) -> Box<dyn Any>>;
struct Node {
func: Function,
code: String,
return_type: String,
args: String,
}
impl Node {
fn eval<T: 'static, U: 'static>(&self, t: T) -> U {
*(self.func)(Box::new(t)).downcast::<U>().unwrap()
}
#[allow(unused)]
fn id(self) -> Self {
self
}
}
impl std::ops::Mul<Self> for Node {
type Output = Self;
fn mul(self, other: Self) -> Self {
node_compose(self, other)
}
}
pub fn compose<F: 'static, G: 'static, Fv, Gv, V>(g: G, f: F) -> Box<dyn Fn(Fv) -> V>
where
F: Fn(Fv) -> Gv,
G: Fn(Gv) -> V,
{
Box::new(move |x| g(f(x)))
}
fn node_compose(g: Node, f: Node) -> Node {
#[rustfmt::skip]
let Node { func: ff, code: fc, args: fa, return_type: fr} = f;
#[rustfmt::skip]
let Node { func, code, args, return_type } = g;
assert_eq!(args, fr);
Node {
func: Box::new(move |x| func(ff(x))),
code: fc + code.as_str(), // temporary TODO: replace
return_type,
args: fa,
}
}
#[graph_proc_macros::to_node]
fn id<T:'static>(t: T) -> T {
t
}
#[graph_proc_macros::to_node]
fn gen_int() -> (u32, u32) {
(42, 43)
}
#[graph_proc_macros::to_node]
fn format_int(x: u32, y: u32) -> String {
x.to_string() + &y.to_string()
}
#[graph_proc_macros::to_node]
fn curry_first_u32(x: u32, node: Node) -> Node {
assert_eq!(node.args[1..].split(",").next(), Some("u32"));
curry_first_arg_node::<u32>().eval((x, node))
}
#[graph_proc_macros::to_node]
fn curry_first_arg<T: 'static + Clone>(x: T, node: Node) -> Node {
node_after_fn_node().eval::<(Node, Function), Node>((
node,
Box::new(move |y: Box<dyn Any>| {
Box::new((x.clone(), *y.downcast::<T>().unwrap())) as Box<dyn Any>
}) ,
))
}
#[graph_proc_macros::to_node]
fn compose_node(g: Node, f: Node) -> Node {
node_compose(g, f)
}
#[graph_proc_macros::to_node]
fn node_after_fn(g: Node, f: Box<dyn Fn(Box<dyn Any>) -> Box<dyn Any>>) -> Node {
let Node {
func, return_type, ..
} = g;
Node {
func: compose(func, f),
code: "unimplemented".to_string(),
return_type,
args: "".to_string(),
}
}
#[graph_proc_macros::to_node]
fn node_from_fn(f: Box<dyn Fn(Box<dyn Any>) -> Box<dyn Any>>) -> Node {
node_after_fn_node().eval((id_node::<Box<dyn Any>>, f))
}
fn main() {
println!("{:?}",(format_int_node() * gen_int_node()).eval::<_, String>(()));
println!(
"{:?}",
curry_first_u32_node()
.eval::<(u32, Node), Node>((3, format_int_node()))
.eval::<u32, String>(43)
);
println!(
"{:?}",
curry_first_arg_node::<u32>()
.eval::<(u32, Node), Node>((3, format_int_node()))
.eval::<u32, String>(43)
);
}