davidm

--[[
  The following example illustrates string interpolation [1]
  by way of a preprocessor that runs as a customer searcher
  function in package.loaders.

  Tested in Lua 5.2.0-beta.
  Depends on
    file_slurp https://gist.github.com/1325400 (for loading files simply)
    luabalanced https://github.com/davidm/lua-balanced (for Lua parsing)

davidm

#!/usr/bin/env lua

--[[ FILE README.txt

LUA MODULE

  sourceunpack v$(_VERSION) - Extract Lua files containing other Lua files.

SYNOPSIS

davidm

Detailed Description: checkglobals module + patch

The checkglobals module + patch (from LuaPowerPatches -- Download Patch for Lua 5.1.3 is a hybrid of a compile-time and run-time approach for detecting undefined variables. Consider the following trivial Lua module:

-- multiplybyx.lua
local function multiplybyx(y)
  return y * X                -- is X defined???
end
return multiplybyx

davidm

-- globalsplus.lua
-- Like globals.lua in Lua 5.1.4 but records fields in global tables too.
-- Probably works but not well tested.  Could be extended even further.
--
-- usage: luac -p -l example.lua  | lua globalsplus.lua
--
-- D.Manura, 2010-07, public domain

local function parse(line)
  local idx,linenum,opname,arga,argb,extra =

davidm

--[[
  Simple Makefile generator in Lua 5.1.
  With gcc include dependency support.
  WARNING: proof of concept; not well tested.  GNU style Makefile.
  See premake for a more complete implementation.
  
  (c) David Manura, 2013-03. MIT license (same as Lua).
--]]

local M = {}

davidm

One method I've prototyped to reduce effects of finite difference (F.D.) staircase effects (though not really recommended nor used but provided for reference):

(1) Solve the partial differential equation for f in the usual way by F.D.
(2) Measure f and grad(f) at each point about one or two mesh units away from the boundary surface by using data from #1.  Use this to update values at boundary condition mesh points.  For example, by linear extrpolation or other extrapolation technique.
(3) Repeat #1 until convergence.

Other obvious variations for updating boundary mesh point values are possible, including expressing #1-3 as a single matrix equation to solve (which probably has some equivalence to currently used techniques), thereby avoiding the repetition needed in #3.

davidm

--[[
 Correctness and benchmark tests of various hamming weight implementations.
 This is also called "popcount".
 See also
   http://lua-users.org/wiki/HammingWeight
   http://stackoverflow.com/questions/109023/best-algorithm-to-count-the-number-of-set-bits-in-a-32-bit-integer
   http://www.dalkescientific.com/writings/diary/archive/2008/07/03/hakmem_and_other_popcounts.html
   http://perso.citi.insa-lyon.fr/claurado/ham/overview.pdf
   http://chessprogramming.wikispaces.com/Population+Count
 David Manura, 2012-03.

davidm

--[[
 memoize.lua

 http://lua-users.org/wiki/FuncTables
 http://www.lua.org/pil/17.1.html

 Code is public domain.
 D.Manura.
--]]

davidm

Moved to https://github.com/davidm/lua-compat-env .

davidm

Moved to https://github.com/davidm/lua-require-any .