From b131e343bb8a2b126a5370138d826d87d74fce30 Mon Sep 17 00:00:00 2001
From: Tom Willemse
Date: Mon, 2 Aug 2021 18:09:03 -0700
Subject: Chapter 16.1

---
 clox/src/main.c | 82 +++++++++++++++++++++++++++++++++++++++++++--------------
 1 file changed, 62 insertions(+), 20 deletions(-)

(limited to 'clox/src/main.c')

diff --git a/clox/src/main.c b/clox/src/main.c
index d1e747f..c95c7ba 100644
--- a/clox/src/main.c
+++ b/clox/src/main.c
@@ -1,36 +1,78 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
 #include "chunk.h"
 #include "common.h"
 #include "debug.h"
 #include "vm.h"
 
-int main(int argc, const char *argv[]) {
-  initVM();
+static void repl() {
+  char line[1024];
+  for (;;) {
+    printf("> ");
 
-  Chunk chunk;
-  initChunk(&chunk);
+    if (!fgets(line, sizeof(line), stdin)) {
+      printf("\n");
+      break;
+    }
 
-  int constant = addConstant(&chunk, 1.2);
-  writeChunk(&chunk, OP_CONSTANT, 123);
-  writeChunk(&chunk, constant, 123);
+    interpret(line);
+  }
+}
 
-  constant = addConstant(&chunk, 3.4);
-  writeChunk(&chunk, OP_CONSTANT, 123);
-  writeChunk(&chunk, constant, 123);
+static char *readFile(const char *path) {
+  FILE *file = fopen(path, "rb");
+  if (file == NULL) {
+    fprintf(stderr, "Could not open file \"%s\".\n", path);
+    exit(74);
+  }
 
-  writeChunk(&chunk, OP_ADD, 123);
+  fseek(file, 0L, SEEK_END);
+  size_t fileSize = ftell(file);
+  rewind(file);
 
-  constant = addConstant(&chunk, 5.6);
-  writeChunk(&chunk, OP_CONSTANT, 123);
-  writeChunk(&chunk, constant, 123);
+  char *buffer = (char *)malloc(fileSize + 1);
+  if (buffer == NULL) {
+    fprintf(stderr, "Not enough memory to read \"%s\".\n", path);
+    exit(74);
+  }
 
-  writeChunk(&chunk, OP_DIVIDE, 123);
-  writeChunk(&chunk, OP_NEGATE, 123);
+  size_t bytesRead = fread(buffer, sizeof(char), fileSize, file);
+  if (bytesRead < fileSize) {
+    fprintf(stderr, "Could not read file \"%s\".\n", path);
+    exit(74);
+  }
+
+  buffer[bytesRead] = '\0';
+
+  fclose(file);
+  return buffer;
+}
+
+static void runFile(const char *path) {
+  char *source = readFile(path);
+  InterpretResult result = interpret(source);
+  free(source);
+
+  if (result == INTERPRET_COMPILE_ERROR)
+    exit(65);
+  if (result == INTERPRET_RUNTIME_ERROR)
+    exit(70);
+}
+
+int main(int argc, const char *argv[]) {
+  initVM();
 
-  writeChunk(&chunk, OP_RETURN, 123);
+  if (argc == 1) {
+    repl();
+  } else if (argc = 2) {
+    runFile(argv[1]);
+  } else {
+    fprintf(stderr, "Usage: clox [path]\n");
+    exit(64);
+  }
 
-  disassembleChunk(&chunk, "test chunk");
-  interpret(&chunk);
   freeVM();
-  freeChunk(&chunk);
   return 0;
 }
-- 
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