From: Tim Vaughan <tgvaughan@gmail.com>
Date: Thu, 21 Jul 2016 08:29:17 +0000 (+1200)
Subject: eatspaces now eats comments
X-Git-Url: https://thelambdalab.xyz/gitweb/index.cgi?p=scheme.forth.jl.git;a=commitdiff_plain;h=85e14c9d3e9509418125d2a7a6b7fa366a8f31ad

eatspaces now eats comments
---

diff --git a/scheme.4th b/scheme.4th
index 19848b6..72897be 100644
--- a/scheme.4th
+++ b/scheme.4th
@@ -377,12 +377,27 @@ parse-idx-stack parse-idx-sp !
     nextchar [char] ) = or
 ;
 
+: commentstart? ( -- bool )
+    nextchar [char] ; = ;
+
 : eatspaces
+
+    false \ Indicates whether or not we're eating a comment
+
     begin
-        whitespace?
+        dup whitespace? or commentstart? or
     while
+        dup nextchar '\n' = and if
+            invert \ Stop eating comment
+        else
+            dup false = commentstart? and if   
+                invert \ Begin eating comment
+            then
+        then
+
         inc-parse-idx
     repeat
+    drop
 ;
 
 : digit? ( -- bool )