Some new Lua wrappers for dungeon building and ranges.

Introduces util.range(start, stop), returning an array consisting of the
numeric values between start and stop inclusive.

Also introduces "is_valid_coord" Lua wrapper, which does the same work
as _valid_coord but does not generate an error message for invalid
coordinates, "find_in_area" (a straight translation of the function in
dungeon.cc), and "is_passable_coord" which checks the glyph at that
location against traversable_glyphs.

1 files changed, 9 insertions, 1 deletions

diff --git a/crawl-ref/source/dat/clua/util.lua b/crawl-ref/source/dat/clua/util.lua
index 8dd0b35eba..ffc8e8c3ae 100644
--- a/crawl-ref/source/dat/clua/util.lua
+++ b/crawl-ref/source/dat/clua/util.lua
@@ -242,6 +242,14 @@ function util.expand_entity(entity, msg)
                      end)
 end
 
+function util.range(start, stop)
+  local rt
+  for i = start, stop do
+    table.insert(rt, i)
+  end
+  return rt
+end
+
 ----------------------------------------------------------
 
 util.Timer = { CLASS = "Timer" }
@@ -337,4 +345,4 @@ function util.namespace(table_name)
   if _G[table_name] == nil then
     _G[table_name] = { }
   end
-end
\ No newline at end of file
+end