From 21c582507ae2dc9d264c80719e39ac47d3b0122b Mon Sep 17 00:00:00 2001
From: HampusM <hampus@hampusmat.com>
Date: Wed, 28 Feb 2024 22:30:38 +0100
Subject: refactor(ecs): use better system input type filtering solution

---
 ecs/build.rs | 98 ------------------------------------------------------------
 1 file changed, 98 deletions(-)
 delete mode 100644 ecs/build.rs

(limited to 'ecs/build.rs')

diff --git a/ecs/build.rs b/ecs/build.rs
deleted file mode 100644
index 1fbde2a..0000000
--- a/ecs/build.rs
+++ /dev/null
@@ -1,98 +0,0 @@
-use std::collections::HashSet;
-use std::path::PathBuf;
-
-use itertools::Itertools;
-use proc_macro2::{Delimiter, Group, Ident};
-use quote::{format_ident, quote, ToTokens};
-
-const CNT: usize = 4;
-
-fn main()
-{
-    let out_dir = PathBuf::from(std::env::var("OUT_DIR").unwrap());
-
-    let impls = (0..CNT).flat_map(create_input_filter_impls).join("\n");
-
-    std::fs::write(out_dir.join("system_input_impls.rs"), impls).unwrap();
-}
-
-fn create_input_filter_impls(cnt: usize) -> Vec<proc_macro2::TokenStream>
-{
-    let mut present = HashSet::new();
-
-    let elements = (0..cnt)
-        .map(|_| ElementKind::Element)
-        .chain(vec![ElementKind::Excluded; cnt])
-        .permutations(cnt)
-        .filter(|combination| {
-            if present.contains(combination) {
-                return false;
-            }
-
-            present.insert(combination.clone());
-
-            true
-        })
-        .map(|elements| {
-            elements
-                .into_iter()
-                .enumerate()
-                .map(|(index, element)| match element {
-                    ElementKind::Element => {
-                        IdentOrTuple::Ident(format_ident!("Elem{index}"))
-                    }
-                    ElementKind::Excluded => IdentOrTuple::Tuple,
-                })
-                .collect::<Vec<_>>()
-        })
-        .collect::<Vec<_>>();
-
-    elements
-        .into_iter()
-        .map(create_single_input_filter_impl)
-        .collect()
-}
-
-fn create_single_input_filter_impl(
-    elements: Vec<IdentOrTuple>,
-) -> proc_macro2::TokenStream
-{
-    let ident_elements = elements
-        .iter()
-        .filter(|element| matches!(element, IdentOrTuple::Ident(_)))
-        .collect::<Vec<_>>();
-
-    quote! {
-        impl<#(#ident_elements: Input,)*> InputFilter for (#(#elements,)*) {
-            type Filtered = (#(#ident_elements,)*);
-        }
-    }
-}
-
-#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
-enum ElementKind
-{
-    Element,
-    Excluded,
-}
-
-#[derive(Debug)]
-enum IdentOrTuple
-{
-    Ident(Ident),
-    Tuple,
-}
-
-impl ToTokens for IdentOrTuple
-{
-    fn to_tokens(&self, tokens: &mut proc_macro2::TokenStream)
-    {
-        match self {
-            Self::Ident(ident) => ident.to_tokens(tokens),
-            Self::Tuple => {
-                Group::new(Delimiter::Parenthesis, proc_macro2::TokenStream::new())
-                    .to_tokens(tokens)
-            }
-        }
-    }
-}
-- 
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