From: Tim Vaughan <tgvaughan@gmail.com>
Date: Mon, 11 Apr 2016 02:21:02 +0000 (+1200)
Subject: Doing my head in!
X-Git-Url: https://thelambdalab.xyz/gitweb/index.cgi?p=forth.jl.git;a=commitdiff_plain;h=5899e2263814d846b7b0e9b08d745a1ef1ea0f04

Doing my head in!
---

diff --git a/src/forth.jl b/src/forth.jl
index c6b8cba..aac4c2a 100644
--- a/src/forth.jl
+++ b/src/forth.jl
@@ -25,7 +25,7 @@ STATE = 0
 
 BASE = 10
 
-# Stack manipulation macros
+# Stack manipulation functions
 
 function pushRS(val::Int64)
     global RSP
@@ -51,7 +51,7 @@ function popPS()
     return val
 end
 
-# Primitive creation functions
+# Primitive creation and calling functions
 
 function defPrim(name::AbstractString, expr::Expr)
     global HERE, LATEST
@@ -80,6 +80,8 @@ defConst(name::AbstractString, val::Int64) = defPrim(name, quote
     jmp = Next
 end)
 
+callPrim(addr::Int64) = eval(primitives[-addr])
+
 # Threading Primitives
 
 NEXT = defPrim("NEXT", quote
@@ -207,14 +209,30 @@ end)
 # I/O
 
 KEY = defPrim("KEY", quote
+
+    jmp = NEXT
+end)
+
+EMIT = defPrim("EMIT", quote
+
+    jmp = NEXT
+end)
+
+WORD = defPrim("WORD", quote
+
+    jmp = NEXT
+end)
+
+NUMBER = defPrim("NUMBER", quote
+
     jmp = NEXT
 end)
 
-# VM loop
+#### VM loop ####
 jmp = NEXT
 function runVM()
     while true
-        eval(primitives[-jmp])
+        callPrim(jmp)
     end
 end