trim benchmark

trim_bench.lua

local function benchmark(func, ...)
   func(...)
   local start = os.clock()
   local result = func(...)
   local elapsed = os.clock() - start

   print(string.format("Time: %.3f ms", elapsed * 1000))
end


local function trim(str)
   return str:match('^%s*(.*%S)') or ''
end

local lpeg = vim.lpeg
local trim_pattern = vim.re.compile("%s* {(%s* %S+)*}")
local function trim2(s)
   return lpeg.match(trim_pattern, s)
end

local str = [[
                                                                                                              
                                                                                                             
                                                                                                             
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
   ]]
local str2 = " \n \f hello \r \v"

local str3 = [[
                                                                                                              
                                                                                                             
                                                                                                             
                                                                                                              
                                                                                                              
                                                                                                              
      hello                                                                                                       
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
                                                                                                              
   ]]

benchmark(trim, str)
benchmark(trim2, str)
benchmark(trim, str2)
benchmark(trim2, str2)
benchmark(trim, str3)
benchmark(trim2, str3)