src/lib/string2.lua

   1
   2 ----------------------------------------------------------------------
   3 ----------------------------------------------------------------------
   4 --
   5 -- String module extension
   6 --
   7 ----------------------------------------------------------------------
   8 ----------------------------------------------------------------------
   9
  10 -- Courtesy of lua-users.org
  11 function string.split(str, pat)
  12    local t = {}
  13    local fpat = "(.-)" .. pat
  14    local last_end = 1
  15    local s, e, cap = string.find(str, fpat, 1)
  16    while s do
  17       if s ~= 1 or cap ~= "" then
  18           table.insert(t,cap)
  19        end
  20       last_end = e+1
  21       s, e, cap = string.find(str, fpat, last_end)
  22    end
  23    if last_end <= string.len(str) then
  24       cap = string.sub(str, last_end)
  25       table.insert(t, cap)
  26    end
  27    return t
  28 end
  29
  30 -- "match" is regularly used as a keyword for pattern matching,
  31 -- so here is an always available substitute.
  32 string.strmatch = string["match"]
  33
  34 -- change a compiled string into a function
  35 function string.undump(str)
  36    if str:strmatch '^\027LuaQ' or str:strmatch '^#![^\n]+\n\027LuaQ' then
  37       local f = (lua_loadstring or loadstring)(str)
  38       return f
  39    else
  40       error "Not a chunk dump"
  41    end
  42 end
  43
  44 return string