From 42a7e262927bfdbbfa15d688610eca37fd0d12e2 Mon Sep 17 00:00:00 2001
From: Tom Willemse <tom@ryuslash.org>
Date: Thu, 21 Oct 2021 20:18:48 -0700
Subject: [PATCH] Chapter 22.2

---
 clox/src/compiler.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/clox/src/compiler.c b/clox/src/compiler.c
index 6a20a20..1e48d22 100644
--- a/clox/src/compiler.c
+++ b/clox/src/compiler.c
@@ -149,6 +149,10 @@ static void endCompiler() {
 #endif
 }
 
+static void beginScope() { current->scopeDepth++; }
+
+static void endScope() { current->scopeDepth--; }
+
 static void expression();
 static void statement();
 static void declaration();
@@ -217,6 +221,14 @@ static void literal(bool canAssign) {
 
 static void expression() { parsePrecedence(PREC_ASSIGNMENT); }
 
+static void block() {
+  while (!check(TOKEN_RIGHT_BRACE) && !check(TOKEN_EOF)) {
+    declaration();
+  }
+
+  consume(TOKEN_RIGHT_BRACE, "Expect '}' after block.");
+}
+
 static void varDeclaration() {
   uint8_t global = parseVariable("Expect variable name.");
 
@@ -280,6 +292,10 @@ static void declaration() {
 static void statement() {
   if (match(TOKEN_PRINT)) {
     printStatement();
+  } else if (match(TOKEN_LEFT_BRACE)) {
+    beginScope();
+    block();
+    endScope();
   } else {
     expressionStatement();
   }