From: Jim Pryor <profjim@jimpryor.net>
Date: Wed, 29 Sep 2010 01:27:27 +0000 (-0400)
Subject: lambda.js: tweak
X-Git-Url: http://lambda.jimpryor.net/git/gitweb.cgi?p=lambda.git;a=commitdiff_plain;h=47ea0791bc48f4fe4fcb95b89bbaf599a1076c80;hp=f318b3af8a52fd28b6aa10fa0bb4e8e3b7a9acc2;ds=sidebyside

lambda.js: tweak

Signed-off-by: Jim Pryor <profjim@jimpryor.net>
---

diff --git a/code/lambda.js b/code/lambda.js
index a07d0ceb..132d9e93 100644
--- a/code/lambda.js
+++ b/code/lambda.js
@@ -213,8 +213,8 @@ function Lambda_var(variable) {
 			return res;
         }
         // return unwind(this, stack);
-		// post-processor, trampoline to, args
-		return [null, null, unwind(this, stack)];
+		// trampoline to, args
+		return [null, unwind(this, stack)];
     };
     this.eval_cbv = function (aggressive) {
         return this;
@@ -265,8 +265,8 @@ function Lambda_app(left, right) {
         var new_stack = stack.slice(0);
         new_stack.unshift(this.right);
         // return this.left.eval_loop(new_stack, eta);
-		// post-processor, trampoline to, args
-		return [null, this.left, new_stack, eta];
+		// trampoline to, args
+		return [this.left, new_stack, eta];
     };
     this.eval_cbv = function (aggressive) {
         var left = this.left.eval_cbv(aggressive);
@@ -359,29 +359,20 @@ function Lambda_lam(variable, body) {
         }
     };
     this.eval_loop = function (stack, eta) {
-		function post(evaluated_body) {
-			var term = new Lambda_lam(this.bound, evaluated_body);
+        if (stack.length === 0) {
+			// var term = new Lambda_lam(this.bound, this.body.eval_loop([], eta));
+			var term = new Lambda_lam(this.bound, reduce(this.body, eta, false));
 			if (eta) {
 				return term.check_eta();
 			} else {
 				return term;
 			}
-		}
-        if (stack.length === 0) {
-//             var term = new Lambda_lam(this.bound, this.body.eval_loop([], eta));
-//             if (eta) {
-//                 return term.check_eta();
-//             } else {
-//                 return term;
-//             }
-			// post-processor, trampoline to, args
-			return [post, this.body, [], eta];	
         } else {
             var x = stack[0];
             var xs = stack.slice(1);
             // return subst(this.bound, x, this.body).eval_loop(xs, eta);
-			// post-processor, trampoline to, args
-			return [null, subst(this.bound, x, this.body), xs, eta];
+			// trampoline to, args
+			return [subst(this.bound, x, this.body), xs, eta];
         }
     };
     this.eval_cbv = function (aggressive) {
@@ -432,15 +423,10 @@ function reduce(expr, eta, cbv) {
         return expr.eval_cbv(cbv > 1);
     } else {
         // return expr.eval_loop([], eta);
-		var post = null, to_eval = expr, res = [[], eta];
+		var to_eval = expr, res = [[], eta];
 		while (to_eval !== null) {
 			res = to_eval.eval_loop.apply(to_eval, res);
-			post = res.shift();
 			to_eval = res.shift();
-			print(res);
-			if (post) {
-				res = post(res);
-			}
 		}
 		return res[0];
     }