Evolve: Quiet warnings

Signed-off-by: Mark Van de Vyver <[email protected]>

minitrace-macro/src/darling.rs

@@ -3,7 +3,7 @@ extern crate syn;
 
 use {
     darling::*,
-    std::path::*,
+    // std::path::*,
 };
 
 #[derive(FromMeta)]

minitrace-macro/src/lib.rs

@@ -34,24 +34,27 @@ use syn::{punctuated::Punctuated, visit_mut::VisitMut, Ident, *};
 use crate::trace::validate::TraceAttr;
 
 mod trace;
-mod darling;
+//mod darling;
 
 #[proc_macro_attribute]
 #[proc_macro_error]
-pub fn trace2(
+pub fn trace(
     args: proc_macro::TokenStream,
     items: proc_macro::TokenStream,
 ) -> proc_macro::TokenStream {
     // Parse TokenStream in context of `#[proc_macro_attribute]`.
     // This context is required by `parse_macro_input!(...)`.
     // NOTE: See comment above Trace
+    println!("{:#?}", args);
+    println!("{:#?}", items);
     let argsc = args.clone();
     let attr_args = parse_macro_input!(argsc as TraceAttr);
     let args2: proc_macro2::TokenStream = args.clone().into();
 
     // Validate - Analyze - Lower - Generate - Rust (VALGR)
-
+    println!("{:#?}", args2);
     trace::validate(args2, items.clone().into());
+    println!("{:#?}", attr_args);
     let models = trace::analyze(attr_args, items.into());
     let ir = trace::lower(models);
     let rust = trace::generate(ir);
@@ -101,7 +104,7 @@ impl Args {
 
 #[proc_macro_attribute]
 #[proc_macro_error]
-pub fn trace(
+pub fn trace2(
     args: proc_macro::TokenStream,
     item: proc_macro::TokenStream,
 ) -> proc_macro::TokenStream {
@@ -604,7 +607,7 @@ fn get_async_trait_info(block: &Block, block_is_async: bool) -> Option<AsyncTrai
 }
 
 // Return a path as a String
-fn path_to_string(path: &Path) -> String {
+fn path_to_string(path: &syn::Path) -> String {
     use std::fmt::Write;
     // some heuristic to prevent too many allocations
     let mut res = String::with_capacity(path.segments.len() * 5);
@@ -662,7 +665,7 @@ struct AsyncTraitBlockReplacer<'a> {
 
 impl<'a> syn::visit_mut::VisitMut for AsyncTraitBlockReplacer<'a> {
     fn visit_block_mut(&mut self, i: &mut Block) {
-       if i == self.block {
+        if i == self.block {
             *i = self.patched_block.clone();
         }
     }

minitrace-macro/src/trace/analyze.rs

@@ -29,11 +29,10 @@ use proc_macro_error::{abort, abort_call_site};
 use syn::{
     parenthesized,
     parse::{Parse, ParseStream},
-    spanned::Spanned,
-    Expr, ItemFn,
+    Expr,
 };
 
-use crate::trace::validate::Ast;
+//use crate::trace::validate::Ast;
 
 // - `<Macro>.name: syn::LitStr,`            // String`
 // - `<Macro>.enter_on_poll: syn::LitBool,`  // boolean
@@ -112,8 +111,8 @@ enum Scope {
 )]
 pub struct Trace {
     // Anything that implements `syn::parse::Parse` is supported.
-    name: syn::LitStr,
-    scope: Scope, // Scope::Local, Scope::Thread, etc.
+    name: Option<syn::LitStr>,
+    scope: Option<Scope>, // Scope::Local, Scope::Thread, etc.
 
     // Fields wrapped in `Option` are and default to `None` if
     // not specified in the attribute.
@@ -154,17 +153,27 @@ impl Parse for Scope {
 //
 // The `Models` container is built based on the attribute parameters
 // held in the `Trace` type.
+//
+// The inputs are:
+// - `meta`: A `syn::Attribute` encapsulated in `TraceAttr`.
+// - `items`: A `proc_macr2::TokenStream`.
 use syn::visit::Visit;
 pub fn analyze(
     meta: crate::trace::validate::TraceAttr,
     items: proc_macro2::TokenStream,
 ) -> Models<Model> {
     let mut models = Models::<Model>::new();
+    //println!("Meta {:#?}", meta);
+    // `from_attributes(..)` takes a slice reference.
     // `meta.attrs` is a `Vec<>`, which implements `AsRef`, so is coerced to `&[]`
     let attrs: &[syn::Attribute] = &meta.attrs;
+    // let attribute = Trace::from_attributes(attrs).unwrap();
+    //println!("Attrs {:#?}", attrs);
     let attribute = match Trace::from_attributes(attrs) {
-        Ok(attrs) => attrs,
-        Err(err) => return err.into_compile_error().into(),
+        Ok(trace) => trace,
+        Err(err) => {
+            return err.into_compile_error().into();
+        }
     };
 
     models.push(Model::Attribute(attribute));
@@ -180,21 +189,10 @@ pub fn analyze(
         models.push(Model::Item(syn::Item::Fn((*f).clone())));
     }
 
-    // Move this check for duplicate `#[trace]` attributes to validate
-    //
-    // for index in (0..attrs.len()).rev() {
-    //     if let Some(ident) = attrs[index].path.get_ident() {
-    //         if ident.to_string().as_str() == "precondition" {
-    //             let attr = attrs.remove(index);
-    //             let _span = attr.tokens.span();
-    //         }
-    //     }
-    // }
-
     models
 }
 
-// `Models` a Vec-newtype
+// `Models` are a Vec-newtype
 //
 // A wrapper that allows us to implement the [`From`] trait.
 // The [`From`] trait provides these conveniences (`match` branch):
@@ -216,6 +214,7 @@ impl<T: std::fmt::Debug> Models<T> {
         Models(Vec::<T>::new())
     }
 
+    #[allow(dead_code)]
     pub fn with_capacity(capacity: usize) -> Models<T> {
         Models(Vec::<T>::with_capacity(capacity))
     }
@@ -248,7 +247,7 @@ impl<T: std::fmt::Debug> std::ops::DerefMut for Models<T> {
 
 #[derive(Debug)]
 struct Item {
-    item: syn::Item,
+    //item: syn::Item,
 }
 
 #[derive(Clone, Debug, PartialEq, thiserror::Error)]
@@ -290,7 +289,7 @@ impl<'ast> syn::visit::Visit<'ast> for FnVisitor<'ast> {
 //     Err(err) => return err.into_compile_error().into(),
 //
 impl std::convert::From<proc_macro2::TokenStream> for Model {
-    fn from(inner: proc_macro2::TokenStream) -> Model {
+    fn from(_inner: proc_macro2::TokenStream) -> Model {
         let attribute = Default::default();
         Model::Attribute(attribute)
     }
@@ -302,7 +301,7 @@ impl std::convert::From<proc_macro2::TokenStream> for Model {
 //
 //
 impl std::convert::From<proc_macro2::TokenStream> for Models<Model> {
-    fn from(inner: proc_macro2::TokenStream) -> Models<Model> {
+    fn from(_inner: proc_macro2::TokenStream) -> Models<Model> {
         let attribute = Default::default();
         let mut models = Models::<Model>::new();
         models.push(Model::Attribute(attribute));
@@ -314,15 +313,15 @@ impl Default for Trace {
     fn default() -> Self {
         // let scope = proc_macro2::Ident::new("Local", proc_macro2::Span::call_site());
         // Some(syn::LitBool::new(false, proc_macro2::Span::call_site()));
-        let name = syn::LitStr::new("root", proc_macro2::Span::call_site());
-        let scope = Scope::Local;
+        let name = Some(syn::LitStr::new("root", proc_macro2::Span::call_site()));
+        let scope = Some(Scope::Local);
         let enter_on_poll = Some(syn::LitBool::new(true, proc_macro2::Span::call_site()));
         let recorder = Some(proc_macro2::Ident::new(
             "span",
             proc_macro2::Span::call_site(),
         ));
         let recurse = None;
-        let root= Some(syn::LitBool::new(false, proc_macro2::Span::call_site()));
+        let root = Some(syn::LitBool::new(false, proc_macro2::Span::call_site()));
         let variables = None;
         let parent = Some(syn::LitStr::new("root", proc_macro2::Span::call_site()));
         let async_trait = None;
@@ -412,8 +411,9 @@ mod tests {
     #[test]
     fn with_traces() {
         let models = analyze(
-            parse_quote!(#[trace]),
+            parse_quote!(),
             parse_quote!(
+                #[trace]
                 fn f(x: bool) {}
             ),
         );
@@ -454,30 +454,37 @@ mod tests {
     }
 
     #[test]
-    #[should_panic]
-    fn error_without_trace() {
+    fn with_no_trace() {
         analyze(
             parse_quote!(),
             parse_quote!(
-                #[without_trace]
-                fn f(x: bool) {}
+                fn f(x: bool) -> bool {
+                    x
+                }
             ),
         );
     }
 
+    // There is no filtering/validation in the `analyze` function.
+    // All such checks are done in `validate` function.
     #[test]
-    fn preserve_non_dsl_attributes() {
+    fn others_with_traces() {
         let models = analyze(
-            parse_quote!(#[trace]),
+            parse_quote!(#[trace()]),
             parse_quote!(
                 #[a]
                 #[trace]
                 #[b]
-                fn f(x: bool) {}
+                fn f(x: bool) -> bool {
+                    x
+                }
             ),
         );
-
-        let expected: &[Attribute] = &[parse_quote!(#[a]), parse_quote!(#[b])];
+        let expected: &[Attribute] = &[
+            parse_quote!(#[a]),
+            parse_quote!(#[trace]),
+            parse_quote!(#[b]),
+        ];
         let model = models.get(1).unwrap();
         let item = if let Model::Item(item) = model {
             item
@@ -491,4 +498,17 @@ mod tests {
         };
         assert_eq!(expected, actual.attrs);
     }
+
+    #[test]
+    fn others_with_no_trace() {
+        let models = analyze(
+            parse_quote!(),
+            parse_quote!(
+                #[a]
+                #[b]
+                fn f(x: bool) {}
+            ),
+        );
+        assert_eq!(models.len(),1);
+    }
 }

minitrace-macro/src/trace/generate.rs

@@ -4,7 +4,7 @@ use syn::{parse_quote, Stmt};
 
 use crate::trace::lower::Assertion;
 
-pub type Rust = proc_macro2::TokenStream;
+//pub type Rust = proc_macro2::TokenStream;
 
 use crate::trace::lower::Quotable;
 use crate::trace::lower::Quotables;
@@ -17,6 +17,7 @@ pub fn generate(quotes: Quotables<Quotable>) -> proc_macro2::TokenStream {
     // Have a logic check earlier to error if there is not **at least one**
     // `syn::Item`
     #[allow(clippy::collapsible_match)]
+    #[allow(unreachable_patterns)]
     let it = match quotes.get(0).expect("An item") {
         Quotable::Item(item) => match item {
             syn::Item::Fn(itemf) => Some(itemf),
@@ -59,11 +60,11 @@ mod tests {
                 fn f(x: bool) {}
             ),
         );
-        println!("{:?}",models.clone());
+        println!("{:?}", models.clone());
         let ir = crate::trace::lower(models);
-        println!("{:?}",ir.clone());
+        println!("{:?}", ir.clone());
         let rust = crate::trace::generate(ir);
-        println!("{:?}",rust.clone());
+        println!("{:?}", rust.clone());
 
         assert!(syn::parse2::<syn::ItemFn>(rust).is_ok());
     }

minitrace-macro/src/trace/lower.rs

@@ -1,6 +1,6 @@
 #[allow(unused_imports)]
 use quote::quote;
-use syn::{Expr, ItemFn};
+use syn::{Expr};
 
 use crate::trace::analyze::Model;
 use crate::trace::analyze::Models;
@@ -15,7 +15,7 @@ pub fn lower(models: Models<Model>) -> Quotables<Quotable>
 //where Model: std::fmt::Display + std::fmt::Debug + From<Model>,
 {
     let quotes = Quotables::new();
-    if let Some(Model::Attribute(attribute)) = models.get(0) {};
+    if let Some(Model::Attribute(_attribute)) = models.get(0) {};
 
     // let assertions = preconditions
     //     .into_iter()
@@ -50,6 +50,7 @@ impl<T: std::fmt::Debug> Quotables<T> {
         Quotables(Vec::<T>::new())
     }
 
+    #[allow(dead_code)]
     pub fn with_capacity(capacity: usize) -> Quotables<T> {
         Quotables(Vec::<T>::with_capacity(capacity))
     }
@@ -84,7 +85,7 @@ impl<T: std::fmt::Debug> std::ops::DerefMut for Quotables<T> {
 // struct Quote2 {
 //     item: syn::Item,
 // }
-
+#[allow(dead_code)]
 #[derive(Clone, Debug, thiserror::Error)]
 #[error("Validation logic error")]
 pub enum Quotable {