works for noöp; initial commit

Author: Dylan-DPC

.gitignore

@@ -1,14 +1,5 @@
-# Generated by Cargo
-# will have compiled files and executables
 debug/
 target/
-
-# Remove Cargo.lock from gitignore if creating an executable, leave it for libraries
-# More information here https://doc.rust-lang.org/cargo/guide/cargo-toml-vs-cargo-lock.html
 Cargo.lock
-
-# These are backup files generated by rustfmt
 **/*.rs.bk
-
-# MSVC Windows builds of rustc generate these, which store debugging information
 *.pdb

Cargo.toml

@@ -0,0 +1,15 @@
+[package]
+name = "assert_proc"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[lib]
+proc-macro = true
+
+[dependencies]
+proc-macro2 = "1.0.60"
+quote = "1.0.28"
+syn = { version = "2.0.18", features = ["full"] }
+

src/generator.rs

@@ -0,0 +1,24 @@
+use proc_macro::TokenStream;
+use syn::{parse_macro_input, ItemStruct};
+use quote::quote;
+
+pub fn generate_test_functions_for_struct(validated: TokenStream, tokens: TokenStream ) -> TokenStream {
+    let item = parse_macro_input!(validated as ItemStruct);
+    let struct_item = item.ident.clone();
+    let value = if tokens.is_empty() { quote!(<#struct_item>::default()) } else { tokens.into() };
+   TokenStream::from(quote! {
+       #item
+       mod tests {
+
+           use super::*;
+
+           // #[test]
+           pub fn foo() {
+           let value = #value; 
+           }
+       }
+            
+   })
+
+
+}

src/lib.rs

@@ -0,0 +1,34 @@
+
+use proc_macro::{TokenStream};
+use syn::{parse_macro_input, Item, ItemStruct, Ident};
+
+mod generator;
+
+
+#[proc_macro_attribute]
+pub fn assert_proc(tokens: TokenStream, inputs: TokenStream) -> TokenStream {
+    let inp = inputs.clone();
+    let input_tokens = parse_macro_input!(inputs as Item);
+    match input_tokens{ 
+        Item::Struct(s) => {
+            let validated = validate_fields(s).unwrap_or(inp);
+            generator::generate_test_functions_for_struct(validated,tokens)
+        },
+        _ => todo!()
+    }
+
+}
+
+fn validate_fields(shtruct: ItemStruct) -> Option<TokenStream> {
+    let mut attributed_fields = shtruct.fields.iter().flat_map(|field| field.attrs.iter().map(|attr| {
+        if attr.path().segments.first().unwrap().ident == Ident::new("assert", proc_macro::Span::call_site().into()) { 
+            None
+        } else {
+            todo!()
+        }
+    }));
+
+    attributed_fields.next().and_then(|fields| fields)
+}
+
+