Mining Lua Code

wiki

What's the least popular string function?

-- usage: clone LuaDist repo [1] and then do lua findescape.lua `find /tmp/Repository -name '*.lua'`

-- [1] github.com/LuaDist/Repository

-- DavidManura

 

lexer = require 'lxsh.lexers.lua'  -- https://github.com/xolox/lua-lxsh



local function readfile(filename)

  local fh = io.open(filename, 'r')

  local text; if fh then text = fh:read'*a':gsub('\r','\n') end

  fh:close()

  return text

end



local counts = {}



for _, filename in ipairs{...} do

  --print(filename)

  local text = readfile(filename)



  for kind, text in lexer.gmatch(text) do

    if kind ~= 'comment' and kind ~= 'whitespace' and kind ~= "string" and kind ~= "number" then

      counts[text] = (counts[text] or 0) + 1

    end

  end

end



local names = {}

for name, count in pairs(counts) do names[#names+1] = {name, count} end

table.sort(names, function(a,b) return a[2] < b[2] end)

for _, pair in ipairs(names) do

  print(pair[1], pair[2])

end

lua test.lua `find /tmp/Repository/ -name '*.lua'`|grep '^string\.'

...

string.gfind	27

string.dump	35

string.lower	41

string.upper	41

string.gmatch	46

string.char	83

string.match	106

string.byte	139

string.rep	148

string.len	159

string.sub	332

string.find	400

string.gsub	492

string.format	722

It's string.reverse.

(Caveat: the above ignores string method calls.)

What percent of source files misuse string escape sequences?

See LuaList:2010-10/msg00449.html .

See Also

• [1] http://en.wikipedia.org/wiki/Content_analysis
• LuaList:2010-10/msg00710.htm - Mining Code Repositories for Language Design