挖掘 Lua 程式碼

wiki

最不受歡迎的字串函式為何？

-- 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

string.reverse。

(注意：以上忽略字串方法呼叫。)

多少比例的原始檔誤用字串跳脫序列？

請參閱 LuaList:2010-10/msg00449.html。

另請參閱

• [1] http://en.wikipedia.org/wiki/Content_analysis
• LuaList:2010-10/msg00710.html - 從程式碼儲存庫中挖掘語言設計