From a52c55eb9af3e29a912d41a48071e830b0971fd5 Mon Sep 17 00:00:00 2001
From: Tom Willemse
Date: Sat, 22 Jan 2022 22:01:54 -0800
Subject: Chapter 24.2 (Does Not Compile)

---
 clox/src/compiler.c | 36 +++++++++++++++++++++++++++---------
 clox/src/compiler.h |  2 +-
 clox/src/object.c   |  4 ++++
 3 files changed, 32 insertions(+), 10 deletions(-)

diff --git a/clox/src/compiler.c b/clox/src/compiler.c
index aed21f7..44eede8 100644
--- a/clox/src/compiler.c
+++ b/clox/src/compiler.c
@@ -44,7 +44,12 @@ typedef struct {
   int depth;
 } Local;
 
+typedef enum { TYPE_FUNCTION, TYPE_SCRIPT } FunctionType;
+
 typedef struct {
+  ObjFunction *function;
+  FunctionType type;
+
   Local locals[UINT8_COUNT];
   int localCount;
   int scopeDepth;
@@ -54,7 +59,7 @@ Parser parser;
 Compiler *current = NULL;
 Chunk *compilingChunk;
 
-static Chunk *currentChunk() { return compilingChunk; }
+static Chunk *currentChunk() { return &current->function->chunk; }
 
 static void errorAt(Token *token, const char *message) {
   if (parser.panicMode)
@@ -165,19 +170,33 @@ static void patchJump(int offset) {
   currentChunk()->code[offset + 1] = jump & 0xff;
 }
 
-static void initCompiler(Compiler *compiler) {
+static void initCompiler(Compiler *compiler, FunctionType type) {
+  compiler->function = NULL;
+  compiler->type = type;
   compiler->localCount = 0;
   compiler->scopeDepth = 0;
+  compiler->function = newFunction();
   current = compiler;
+
+  Local *local = &current->locals[current->localCount++];
+  local->depth = 0;
+  local->name.start = "";
+  local->name.length = 0;
 }
 
-static void endCompiler() {
+static ObjFunction *endCompiler() {
   emitReturn();
+  ObjFunction *function = current->function;
+
 #ifdef DEBUG_PRINT_CODE
   if (!parser.hadError) {
-    disassembleChunk(currentChunk(), "code");
+    disassembleChunk(currentChunk(), function->name != NULL
+                                         ? function->name->chars
+                                         : "<script>");
   }
 #endif
+
+  return function;
 }
 
 static void beginScope() { current->scopeDepth++; }
@@ -649,11 +668,10 @@ static void defineVariable(uint8_t global) {
 
 static ParseRule *getRule(TokenType type) { return &rules[type]; }
 
-bool compile(const char *source, Chunk *chunk) {
+ObjFunction *compile(const char *source) {
   initScanner(source);
   Compiler compiler;
-  initCompiler(&compiler);
-  compilingChunk = chunk;
+  initCompiler(&compiler, TYPE_SCRIPT);
 
   parser.hadError = false;
   parser.panicMode = false;
@@ -664,6 +682,6 @@ bool compile(const char *source, Chunk *chunk) {
     declaration();
   }
 
-  endCompiler();
-  return !parser.hadError;
+  ObjFunction *function = endCompiler();
+  return parser.hadError ? NULL : function;
 }
diff --git a/clox/src/compiler.h b/clox/src/compiler.h
index e7023a9..7de1c20 100644
--- a/clox/src/compiler.h
+++ b/clox/src/compiler.h
@@ -4,6 +4,6 @@
 #include "object.h"
 #include "vm.h"
 
-bool compile(const char *source, Chunk *chunk);
+ObjFunction *compile(const char *source);
 
 #endif
diff --git a/clox/src/object.c b/clox/src/object.c
index 7170352..2df533e 100644
--- a/clox/src/object.c
+++ b/clox/src/object.c
@@ -69,6 +69,10 @@ ObjString *copyString(const char *chars, int length) {
 }
 
 static void printFunction(ObjFunction *function) {
+  if (function->name == NULL) {
+    printf("<script>");
+    return;
+  }
   printf("<fn %s>", function->name->chars);
 }
 
-- 
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