Print the diagnostics in stderr for files which do not have span information

api/sixtyfps-rs/sixtyfps-macros/Cargo.toml

@@ -16,6 +16,6 @@ path = "lib.rs"
 [dependencies]
 quote = "1.0"
 proc-macro2 = "1.0.17"
-sixtyfps-compilerlib = { version = "=0.0.2", path = "../../../sixtyfps_compiler", features = ["proc_macro_span", "rust"] }
+sixtyfps-compilerlib = { version = "=0.0.2", path = "../../../sixtyfps_compiler", features = ["proc_macro_span", "rust", "display-diagnostics"] }
 spin_on = "0.1"
 

api/sixtyfps-rs/sixtyfps-macros/lib.rs

@@ -336,8 +336,7 @@ pub fn sixtyfps(stream: TokenStream) -> TokenStream {
         spin_on::spin_on(compile_syntax_node(syntax_node, diag, compiler_config));
     //println!("{:#?}", tree);
     if diag.has_error() {
-        diag.map_offsets_to_span(&tokens);
-        return diag.into_token_stream().into();
+        return report_diagnostics(diag, &tokens);
     }
 
     let mut result = generator::rust::generate(&root_component, &mut diag);
@@ -353,10 +352,27 @@ pub fn sixtyfps(stream: TokenStream) -> TokenStream {
         x.extend(quote! {const _ : Option<&'static str> = ::core::option_env!("SIXTYFPS_STYLE");});
     });
 
-    result
-        .unwrap_or_else(|| {
-            diag.map_offsets_to_span(&tokens);
-            diag.into_token_stream()
-        })
-        .into()
+    let diags = report_diagnostics(diag, &tokens);
+    result.map_or(diags, |r| r.into())
+}
+
+fn report_diagnostics(
+    diag: diagnostics::BuildDiagnostics,
+    span_map: &[parser::Token],
+) -> TokenStream {
+    let mut result = TokenStream::new();
+    let mut needs_error = diag.has_error();
+    for mut file_diag in diag.into_iter() {
+        if file_diag.source.is_none() {
+            file_diag.map_offsets_to_span(span_map);
+            needs_error &= !file_diag.has_error();
+            result.extend(TokenStream::from(file_diag.into_token_stream()))
+        } else {
+            file_diag.print();
+        }
+    }
+    if needs_error {
+        result.extend(TokenStream::from(quote!(compile_error! { "Error occured" })))
+    }
+    result
 }

sixtyfps_compiler/diagnostics.rs

@@ -473,13 +473,6 @@ impl BuildDiagnostics {
     }
 }
 
-#[cfg(feature = "proc_macro_span")]
-impl quote::ToTokens for BuildDiagnostics {
-    fn to_tokens(&self, tokens: &mut proc_macro2::TokenStream) {
-        self.iter().for_each(|diag| diag.to_tokens(tokens))
-    }
-}
-
 impl Extend<FileDiagnostics> for BuildDiagnostics {
     fn extend<T: IntoIterator<Item = FileDiagnostics>>(&mut self, iter: T) {
         for diag in iter {