From 1e78c8c7f324df3a5bc1992ac68d4277613c45b0 Mon Sep 17 00:00:00 2001
From: Erik Winter <erik@deonticdata.com>
Date: Mon, 22 Jul 2024 14:30:33 +0200
Subject: [PATCH] 4.2

---
 jlox.iml           |  1 -
 src/Lox.java       | 18 +++++++++++++++++-
 src/Token.java     | 17 +++++++++++++++++
 src/TokenType.java | 18 ++++++++++++++++++
 4 files changed, 52 insertions(+), 2 deletions(-)
 create mode 100644 src/Token.java
 create mode 100644 src/TokenType.java

diff --git a/jlox.iml b/jlox.iml
index 57d33ec..c90834f 100644
--- a/jlox.iml
+++ b/jlox.iml
@@ -4,7 +4,6 @@
     <exclude-output />
     <content url="file://$MODULE_DIR$">
       <sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
-      <excludeFolder url="file://$MODULE_DIR$/.idea/copilot/chatSessions" />
     </content>
     <orderEntry type="inheritedJdk" />
     <orderEntry type="sourceFolder" forTests="false" />
diff --git a/src/Lox.java b/src/Lox.java
index f2031d6..b18b585 100644
--- a/src/Lox.java
+++ b/src/Lox.java
@@ -4,9 +4,12 @@ import java.io.InputStreamReader;
 import java.nio.charset.Charset;
 import java.nio.file.Files;
 import java.nio.file.Paths;
+import java.util.List;
 import java.util.Scanner;
 
 public class Lox {
+    static boolean hadError = false;
+
     public static void main(String[] args) throws IOException {
         if (args.length > 1) {
             System.out.println("Usage: jlox [script]");
@@ -21,6 +24,9 @@ public class Lox {
     private static void runFile(String path) throws IOException {
         byte[] bytes = Files.readAllBytes(Paths.get(path));
         run(new String(bytes, Charset.defaultCharset()));
+        if (hadError) {
+            System.exit(65);
+        }
     }
 
     private static void runPrompt() throws IOException {
@@ -32,6 +38,7 @@ public class Lox {
             String line = reader.readLine();
             if (line == null) break;
             run(line);
+            hadError = false;
         }
     }
 
@@ -41,7 +48,16 @@ public class Lox {
 
         for (Token token : tokens) {
             System.out.println(token);
-            
+
         }
     }
+
+    static void error(int line, String message) {
+        report(line, "", message);
+    }
+
+    private static void report(int line, String where, String message) {
+        System.err.println("[" + line + "] " + where + ": " + message);
+        hadError = true;
+    }
 }
diff --git a/src/Token.java b/src/Token.java
new file mode 100644
index 0000000..405ac20
--- /dev/null
+++ b/src/Token.java
@@ -0,0 +1,17 @@
+class Token {
+    final TokenType type;
+    final String lexeme;
+    final Object literal;
+    final int line;
+
+    Token(TokenType type, String lexeme, Object literal, int line) {
+        this.type = type;
+        this.lexeme = lexeme;
+        this.literal = literal;
+        this.line = line;
+    }
+
+    public String toString() {
+        return type + " " + lexeme + " " + literal;
+    }
+}
diff --git a/src/TokenType.java b/src/TokenType.java
new file mode 100644
index 0000000..4d9fc56
--- /dev/null
+++ b/src/TokenType.java
@@ -0,0 +1,18 @@
+enum TokenType {
+    // Single-character tokens
+    LEFT_PAREN, RIGHT_PAREN, LEFT_BRACE, RIGHT_BRACE,
+    COMMA, DOT, MINUS, PLUS, SEMICOLON, SLASH, STAR,
+
+    // One or two character tokens
+    BANG, BANG_EQUAL, EQUAL, EQUAL_EQUAL,
+    GREATER, GREATER_EQUAL, LESS, LESS_EQUAL,
+
+    // Literals
+    IDENTIFIER, STRING, NUMBER,
+
+    // Keywords
+    AND, CLASS, ELSE, FALSE, FUN, FOR, IF, NIL, OR,
+    PRINT, RETURN, SUPER, THIS, TRUE, VAR, WHILE,
+
+    EOF
+}