From 0c70372774297272dd14133d48e40e9a3624420a Mon Sep 17 00:00:00 2001
From: Ben Winston
Date: Sat, 20 May 2023 15:12:30 -0400
Subject: initial commit of compiler/VM with a couple basic instructions

---
 dbg.d | 55 ++++++++++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 54 insertions(+), 1 deletion(-)

(limited to 'dbg.d')

diff --git a/dbg.d b/dbg.d
index 4af02a6..dba6070 100644
--- a/dbg.d
+++ b/dbg.d
@@ -2,11 +2,58 @@ import std.stdio;
 import std.string;
 
 import chunk;
-import parser : Value, Atom, ValueType;
+import parser;
 //import parser;
 //import dbg;
 //import value;
 
+void printForm(Form f, string prefix = "") {
+    switch (f.type) {
+        case FormType.EOF:
+            writeln("eof");
+            return;
+        case FormType.ATOM:
+            writefln("%s atom: %s", prefix, atomAsString(cast(Atom)f));
+            break;
+        case FormType.CONS:
+            Cons c = cast(Cons)f;
+            writef("%s cons <", prefix);
+            if (c.evaluate) {
+                writeln("true>");
+            } else {
+                writeln("false>");
+            }
+
+            printForm(c.head, format("%s>", prefix)); 
+            foreach (Form i ; c.tail) {
+                printForm(i, format("%s>", prefix)); 
+            }
+            break;
+        case FormType.NIL:
+            writefln("%s NIL", prefix);
+            break;
+        case FormType.PARSE_ERROR:
+            ParseError pe = cast(ParseError)f;
+            writefln("ERROR: %s", pe.message);
+            break;
+        case FormType.SYMBOL:
+            Symbol s = cast(Symbol)f;
+            writefln("%s sym: %s", prefix, s.name);
+            break;
+        case FormType.FUNC:
+            Func func = cast(Func)f;
+            writefln("%s <fn %s>", prefix, func.name.name);
+            printForm(func.args, format("%s -", prefix));
+            writefln("%s with %d body lines", prefix, func.funcBody.length);
+            writefln("%s <end fn %s>", prefix, func.name.name);
+            break;
+        default:
+            writeln("printFormDefault");
+            break;
+    }
+
+}
+
 string printableValue(Value val) {
     switch (val.type) {
         case ValueType.STRING:
@@ -48,6 +95,10 @@ int disassemble(Chunk chunk, int offset) {
     switch (inst) {
         case OpCode.OP_ADD:
             return simpleInstruction("OP_ADD", offset);
+        case OpCode.OP_LESS:
+            return simpleInstruction("OP_LESS", offset);
+        case OpCode.OP_SUBTRACT:
+            return simpleInstruction("OP_SUBTRACT", offset);
         case OpCode.OP_CONSTANT:
             return constantInstruction("OP_CONSTANT", chunk, offset);
         case OpCode.OP_NEGATE:
@@ -56,6 +107,8 @@ int disassemble(Chunk chunk, int offset) {
             return simpleInstruction("OP_POP", offset);
         case OpCode.OP_RETURN:
             return simpleInstruction("OP_RETURN", offset);
+        case OpCode.OP_NIL:
+            return simpleInstruction("OP_NIL", offset);
         default:
             writeln("unknown opcode?");
             return offset + 1;
-- 
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