From 0ae8830b0446f7e0aec3cd610198ced1ad896aa7 Mon Sep 17 00:00:00 2001
From: SFG545 <khyrenjoseph253@gmail.com>
Date: Thu, 11 Jun 2026 08:15:35 -0500
Subject: [PATCH] implement brace depth tracking in Compiler for unmatched '{'
 error handling

---
 include/sedpp/Compiler.h | 1 +
 src/Compiler.cpp         | 8 ++++++++
 src/main.cpp             | 4 ----
 3 files changed, 9 insertions(+), 4 deletions(-)

diff --git a/include/sedpp/Compiler.h b/include/sedpp/Compiler.h
index 395c8f4..ba4f6ec 100644
--- a/include/sedpp/Compiler.h
+++ b/include/sedpp/Compiler.h
@@ -40,6 +40,7 @@ private:
   const Options &options_;
   Program program_;
   std::unordered_map<std::string, std::size_t> labels_;
+  int braceDepth_ = 0;
 };
 
 } // namespace sedpp
diff --git a/src/Compiler.cpp b/src/Compiler.cpp
index 4845c5b..884b8c2 100644
--- a/src/Compiler.cpp
+++ b/src/Compiler.cpp
@@ -100,6 +100,9 @@ Program Compiler::compile(const std::vector<std::string> &scripts) {
   for (const std::string &script : scripts) {
     compileOne(script);
   }
+  if (braceDepth_ > 0) {
+    throw std::runtime_error("-e expression #1, char 0: unmatched '{'");
+  }
   return program_;
 }
 
@@ -333,7 +336,12 @@ void Compiler::compileOne(const std::string &script) {
     command.opcode = script[pos++];
     switch (command.opcode) {
     case '{':
+      ++braceDepth_;
+      break;
     case '}':
+      if (braceDepth_ > 0) {
+        --braceDepth_;
+      }
       break;
     case ':':
       command.label = readUntilCommandEnd(script, pos);
diff --git a/src/main.cpp b/src/main.cpp
index 3671c36..7dcfd1f 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -162,10 +162,6 @@ bool emitKnownCompileDiagnostic(const std::string &script,
       expressionError(2, "unexpected '}'");
       return true;
     }
-    if (script == "1{") {
-      expressionError(0, "unmatched '{'");
-      return true;
-    }
     if (script == "{1}") {
       expressionError(3, "'}' doesn't want any addresses");
       return true;