From 869a2ec9dc40ec39d6833e1bd8eaeaf630216e5a Mon Sep 17 00:00:00 2001
From: Martin Peach <mrpeach@users.sourceforge.net>
Date: Thu, 19 Apr 2012 19:06:41 +0000
Subject: A version of list-abs' [list-rdrip] in lua

svn path=/trunk/externals/loaders/pdlua/; revision=16128
---
 examples/llist-rdrip-help.pd | 35 +++++++++++++++++++++++++++++++++++
 examples/llist-rdrip.pd_lua  | 39 +++++++++++++++++++++++++++++++++++++++
 2 files changed, 74 insertions(+)
 create mode 100644 examples/llist-rdrip-help.pd
 create mode 100644 examples/llist-rdrip.pd_lua

diff --git a/examples/llist-rdrip-help.pd b/examples/llist-rdrip-help.pd
new file mode 100644
index 0000000..4627bf8
--- /dev/null
+++ b/examples/llist-rdrip-help.pd
@@ -0,0 +1,35 @@
+#N canvas 392 517 588 334 10;
+#X declare -lib pdlua;
+#X obj 89 10 import pdlua;
+#X msg 99 130 1 2 3 a b c;
+#X msg 121 152 list twig branch root;
+#X floatatom 77 109 5 0 0 0 - - -;
+#X obj 199 274 print dripped;
+#X symbolatom 36 68 10 0 0 0 - - -;
+#X obj 36 44 bng 15 250 50 0 empty empty empty 17 7 0 10 -262144 -1
+-1;
+#X obj 56 89 bng 15 250 50 0 empty empty empty 17 7 0 10 -262144 -1
+-1;
+#X msg 187 218 alpha;
+#X msg 165 196 list alpha;
+#X msg 143 174 alpha beta gamma 1.234 -2;
+#X text 307 173 <- a message is interpreted as a list;
+#X text 259 152 <- a true list;
+#X text 239 196 <- a list with one element is still a list;
+#X text 229 217 <- a message is taken to be a oone-element list;
+#X text 178 130 <- a list beginning with a float is still a list;
+#X text 137 81 <- any single items are passed through unchanged;
+#X text 375 292 by Martin Peach \, 2012_04_19;
+#X text 196 37 [llist-rdrip] outputs any input as a reverse sequence
+;
+#X obj 199 247 llist-rdrip;
+#X connect 1 0 19 0;
+#X connect 2 0 19 0;
+#X connect 3 0 19 0;
+#X connect 5 0 19 0;
+#X connect 6 0 5 0;
+#X connect 7 0 19 0;
+#X connect 8 0 19 0;
+#X connect 9 0 19 0;
+#X connect 10 0 19 0;
+#X connect 19 0 4 0;
diff --git a/examples/llist-rdrip.pd_lua b/examples/llist-rdrip.pd_lua
new file mode 100644
index 0000000..5d07dfd
--- /dev/null
+++ b/examples/llist-rdrip.pd_lua
@@ -0,0 +1,39 @@
+--[[ 
+  llist-rdrip
+  Output a list as a sequence of elements in reverse order
+  author Martin Peach 20120419
+--]]
+
+-- Pd class
+
+local LlistRdrip = pd.Class:new():register("llist-rdrip")
+local selectormap = {string = "symbol", number="float", userdata="pointer"} -- for lua/Pd type conversion
+
+function LlistRdrip:initialize(name, atoms)
+  self.inlets = 1
+  self.outlets = 1
+  return true
+end
+
+function LlistRdrip:in_1(sel, atoms) -- anything
+  --pd.post("sel is " .. sel);
+  --pd.post("number of atoms is ".. #atoms)
+  --for i,v in ipairs(atoms) do
+  --  pd.post(i .. " = " .. v)
+  --end
+  if sel == "list" then -- the usual case
+    for i = #atoms, 1, -1 do
+      -- map lua types to pd selectors
+      self:outlet(1, selectormap[type(atoms[i])], {atoms[i]})
+    end
+  elseif sel == "float" or sel == "symbol" or sel == "pointer" or sel == "bang" then -- single element "lists"
+    self:outlet(1, sel, {atoms[1]})
+  else -- messages are lists beginning with a selector
+    self:outlet(1, selectormap[type(sel)], {sel})
+    for i = #atoms , 1 , -1 do
+      self:outlet(1, selectormap[type(atoms[i])], {atoms[i]})
+    end
+  end  
+end
+-- end of llist-rdrip
+
-- 
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