From 28056b1f89101836e09553d0925150269f6a20df Mon Sep 17 00:00:00 2001
From: greg <greg.shuflin@protonmail.com>
Date: Tue, 1 Oct 2019 21:40:30 -0700
Subject: [PATCH] Add production name in ParseError

for debugging
---
 schala-lang/codegen/src/lib.rs      | 5 ++++-
 schala-lang/language/src/parsing.rs | 3 ++-
 2 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/schala-lang/codegen/src/lib.rs b/schala-lang/codegen/src/lib.rs
index 6883a4d..c752a9d 100644
--- a/schala-lang/codegen/src/lib.rs
+++ b/schala-lang/codegen/src/lib.rs
@@ -32,7 +32,10 @@ impl Fold for RecursiveDescentFn {
         if self.parse_level != 0 {
           self.parse_level -= 1;
         }
-        result
+        result.map_err(|mut parse_error: ParseError| {
+          parse_error.production_name = Some(stringify!(#ident).to_string());
+          parse_error
+        })
       }
     };
     i.block = Box::new(new_block);
diff --git a/schala-lang/language/src/parsing.rs b/schala-lang/language/src/parsing.rs
index 3bf1d37..c591827 100644
--- a/schala-lang/language/src/parsing.rs
+++ b/schala-lang/language/src/parsing.rs
@@ -160,13 +160,14 @@ use crate::ast::*;
 /// Represents a parsing error
 #[derive(Debug)]
 pub struct ParseError {
+  pub production_name: Option<String>,
   pub msg: String,
   pub token: Token
 }
 
 impl ParseError {
   fn new_with_token<T, M>(msg: M, token: Token) -> ParseResult<T> where M: Into<String> {
-    Err(ParseError { msg: msg.into(), token })
+    Err(ParseError { msg: msg.into(), token, production_name: None })
   }
 }