From 9fe6496202bd95d252ed2323a88fd24781780b64 Mon Sep 17 00:00:00 2001
From: mryouse
Date: Thu, 25 May 2023 21:15:04 +0000
Subject: lists as sequences, first and rest

---
 compiler.d | 27 +++++++++++++++++++++++++--
 1 file changed, 25 insertions(+), 2 deletions(-)

(limited to 'compiler.d')

diff --git a/compiler.d b/compiler.d
index 6a1424d..6f5f0fd 100644
--- a/compiler.d
+++ b/compiler.d
@@ -345,9 +345,12 @@ class Compiler {
     */
 
     int resolveLocal(Symbol sym) { 
+        writefln("resolving local: %s", sym.name);
         for (int i = this.localCount - 1; i >= 0; i--) {
             Local local = this.locals[i];
+            writefln(" > [%d] %s (%s)", i, local.sym.name, local.depth);
             if (local.sym.name == sym.name) {
+                writeln("got it!");
                 return i;
             }
         }
@@ -524,8 +527,8 @@ class Compiler {
             writeln("COMPILE ERROR: 'first' expects exactly one argument");
             return;
         }
-        ValueType vt = this.resolve(args[0], ValueType.OBJ); // TODO need a new type
-        this.func.chunk.writeOp(OpCode.OP_TYPE_CHECK_LIST, args[0].line);
+        ValueType vt = this.resolve(args[0], ValueType.SEQ); // TODO need a new type
+        this.func.chunk.writeOp(OpCode.OP_TYPE_CHECK_SEQ, args[0].line);
 
         // pop the value off the stack
         // get the address of the first item in the list
@@ -535,6 +538,23 @@ class Compiler {
         this.func.chunk.writeOp(OpCode.OP_FIRST, args[0].line);
     }
 
+    void compileRest(Form[] args) {
+        // TODO how do we identify/propagate errors?
+        if (args.length != 1) {
+            writeln("COMPILE ERROR: 'first' expects exactly one argument");
+            return;
+        }
+        ValueType vt = this.resolve(args[0], ValueType.OBJ); // TODO need a new type
+        this.func.chunk.writeOp(OpCode.OP_TYPE_CHECK_SEQ, args[0].line);
+
+        this.func.chunk.writeOp(OpCode.OP_REST, args[0].line);
+
+        // there's probably a nicer way to copy
+        //List lst = new List();
+
+        // create a copy of the list
+    }
+
     void compileFunc(Form form) {
         Func f = cast(Func)form;
 
@@ -629,6 +649,9 @@ class Compiler {
                 //return compileList(cons.tail);
                 this.compileList(cons.tail);
                 break;
+            case "rest":
+                this.compileRest(cons.tail);
+                break;
             default:
                 /*
                 writefln("unsure how to compile %s", sym.name);
-- 
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