lpegified file loader. stubs for other formats.

1 files changed, 13 insertions, 2 deletions

diff --git a/life.lua b/life.lua
index 127974b..fca6d4c 100644
--- a/life.lua
+++ b/life.lua
@@ -140,12 +140,13 @@ function gol.apply_rule (cell, cnt, rule, fade, keep)
     return new
 end
     
+gol.formats = {}
 
-function gol.parse_file (fname)
+gol.formats[".gol"] = function (fname)
     local tmp = {} -- return an array
     local len      -- check for equal line length
 
-    if fname:sub(-4,-1) ~= ".gol" then -- check extension
+    if fname:sub(-4,-1) ~= ".gol" then
         fname = fname .. ".gol"
     end
 
@@ -177,6 +178,16 @@ function gol.parse_file (fname)
     end
 end
 
+
+function gol.parse_file (fname)
+    local p_suf = P"." * (1-P".")^3 * -P(1)
+    local p_fn  = (1-p_suf)^1 * C(p_suf)
+    local suffix = p_fn:match(fname) or ".gol" -- assume .gol format as default
+
+    return gol.formats[suffix] ( fname )
+end
+
+
 --- Computing single lines and whole frames and intervals thereof
 
 function gol.next_line (rows, rule)