From ce5f5fffc1c4bc3166aeca9592d47bbbfdda580a Mon Sep 17 00:00:00 2001
From: Amaan Qureshi <amaanq12@gmail.com>
Date: Sat, 10 Feb 2024 21:11:03 -0500
Subject: [PATCH] chore(generate): dedup and warn about duplicate or invalid
 rules

---
 cli/src/generate/dsl.js | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/cli/src/generate/dsl.js b/cli/src/generate/dsl.js
index 0aa367fd..32b961f7 100644
--- a/cli/src/generate/dsl.js
+++ b/cli/src/generate/dsl.js
@@ -351,7 +351,17 @@ function grammar(baseGrammar, options) {
       throw new Error("Grammar's inline must be an array of rules.");
     }
 
-    inline = inlineRules.map(symbol => symbol.name);
+    inline = inlineRules.filter((symbol, index, self) => {
+      if (self.findIndex(s => s.name === symbol.name) !== index) {
+        console.log(`Warning: duplicate inline rule '${symbol.name}'`);
+        return false;
+      }
+      if (symbol.name === 'ReferenceError') {
+        console.log(`Warning: inline rule '${symbol.symbol.name}' is not defined.`);
+        return false;
+      }
+      return true;
+    }).map(symbol => symbol.name);
   }
 
   let supertypes = baseGrammar.supertypes;