README.md

@@ -1,18 +1,5 @@
 # jorts
 
-a compiler for the lox language from https://craftinginterpreters.com
+an interpreter for the lox language from https://craftinginterpreters.com
 
-this is a learning project. the implemtation is based heavily off the C part
-of the book, but also the Java part for the scanner.
-
-## notes
-
- - jorts' lox bytecode is not compatible with any implementation.
-
-## how do?
-
-```
-zig build run
-```
-
-and play around with it
+this is a learning project.

src/chunk.zig

@@ -18,8 +18,6 @@ const AllOpcodes = struct {
     pub Nil: u8 = 8,
     pub True: u8 = 9,
     pub False: u8 = 10,
-
-    pub Not: u8 = 11,
 };
 
 pub const OpCode = AllOpcodes{};
@@ -176,8 +174,6 @@ pub const Chunk = struct {
             return try simpleInstruction(stdout, "OP_TRUE", index);
         } else if (instruction == OpCode.False) {
             return try simpleInstruction(stdout, "OP_FALSE", index);
-        } else if (instruction == OpCode.Not) {
-            return try simpleInstruction(stdout, "OP_NOT", index);
         } else {
             try stdout.print("Unknown opcode: {}\n", instruction);
             return index + 1;

src/compiler.zig

@@ -75,7 +75,7 @@ var rules = []ParseRule{
     ParseRule{ .infix = Compiler.binary, .precedence = .Factor },
 
     // as the token enum says, those are 1/2 char tokens.
-    ParseRule{ .prefix = Compiler.unary },
+    ParseRule{},
     // this is specifically for the != operator
     ParseRule{ .precedence = .Equality },
     ParseRule{},
@@ -236,7 +236,6 @@ pub const Compiler = struct {
 
         switch (ttype) {
             .MINUS => try self.emitByte(OpCode.Negate),
-            .BANG => try self.emitByte(OpCode.Not),
             else => unreachable,
         }
     }

src/vm.zig

@@ -16,10 +16,6 @@ pub const InterpretResult = error{
     RuntimeError,
 };
 
-fn isFalsey(val: value.Value) bool {
-    return val.vtype == .Nil or (val.vtype == .Bool and !val.as.Bool);
-}
-
 pub const VM = struct {
     chk: *Chunk = undefined,
     src: []const u8,
@@ -174,9 +170,6 @@ pub const VM = struct {
                 chunk.OpCode.Subtract => try self.doSub(),
                 chunk.OpCode.Multiply => try self.doMul(),
                 chunk.OpCode.Divide => try self.doDiv(),
-                chunk.OpCode.Not => blk: {
-                    try self.push(values.BoolVal(isFalsey(self.pop())));
-                },
                 chunk.OpCode.Negate => blk: {
                     var val = self.peek(0);
                     if (val.vtype != .Bool) {