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--[[ DataDumper.lua

Copyright (c) 2007 Olivetti-Engineering SA

Permission is hereby granted, free of charge, to any person

obtaining a copy of this software and associated documentation

files (the "Software"), to deal in the Software without

restriction, including without limitation the rights to use,

copy, modify, merge, publish, distribute, sublicense, and/or sell

copies of the Software, and to permit persons to whom the

Software is furnished to do so, subject to the following

conditions:

The above copyright notice and this permission notice shall be

included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,

EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES

OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND

NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT

HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,

WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING

FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR

OTHER DEALINGS IN THE SOFTWARE.

]]

local _ENV = mkmodule('dumper')

local dumplua_closure = [[

local closures = {}

local function closure(t)

closures[#closures+1] = t

t[1] = assert(loadstring(t[1]))

return t[1]

end

for _,t in pairs(closures) do

for i = 2,#t do

debug.setupvalue(t[1], i-1, t[i])

end

end

]]

local lua_reserved_keywords = {

'and', 'break', 'do', 'else', 'elseif', 'end', 'false', 'for',

'function', 'if', 'in', 'local', 'nil', 'not', 'or', 'repeat',

'return', 'then', 'true', 'until', 'while' }

local function keys(t)

local res = {}

local oktypes = { stringstring = true, numbernumber = true }

local function cmpfct(a,b)

if oktypes[type(a)..type(b)] then

return a < b

else

return type(a) < type(b)

end

end

for k in pairs(t) do

res[#res+1] = k

end

table.sort(res, cmpfct)

return res

end

local c_functions = {}

for _,lib in pairs{'_G', 'string', 'table', 'math',

'io', 'os', 'coroutine', 'package', 'debug'} do

local t = _G[lib] or {}

lib = lib .. "."

if lib == "_G." then lib = "" end

for k,v in pairs(t) do

if type(v) == 'function' and not pcall(string.dump, v) then

c_functions[v] = lib..k

end

end

end

function DataDumper(value, varname, fastmode, ident, indent_step)

indent_step = indent_step or 2

local defined, dumplua = {}

-- Local variables for speed optimization

local string_format, type, string_dump, string_rep =

string.format, type, string.dump, string.rep

local tostring, pairs, table_concat =

tostring, pairs, table.concat

local keycache, strvalcache, out, closure_cnt = {}, {}, {}, 0

setmetatable(strvalcache, {__index = function(t,value)

local res = string_format('%q', value)

t[value] = res

return res

end})

local fcts = {

string = function(value) return strvalcache[value] end,

number = function(value) return value end,

boolean = function(value) return tostring(value) end,

['nil'] = function(value) return 'nil' end,

['function'] = function(value)

return string_format("loadstring(%q)", string_dump(value))

end,

userdata = function() error("Cannot dump userdata") end,

thread = function() error("Cannot dump threads") end,

}

local function test_defined(value, path)

if defined[value] then

if path:match("^getmetatable.*%)$") then

out[#out+1] = string_format("s%s, %s)\n", path:sub(2,-2), defined[value])

else

out[#out+1] = path .. " = " .. defined[value] .. "\n"

end

return true

end

defined[value] = path

end

local function make_key(t, key)

local s

if type(key) == 'string' and key:match('^[_%a][_%w]*$') then

s = key .. "="

else

s = "[" .. dumplua(key, 0) .. "]="

end

t[key] = s

return s

end

for _,k in ipairs(lua_reserved_keywords) do

keycache[k] = '["'..k..'"] = '

end

if fastmode then

fcts.table = function (value)

-- Table value

local numidx = 1

out[#out+1] = "{"

for key,val in pairs(value) do

if key == numidx then

numidx = numidx + 1

else

out[#out+1] = keycache[key]

end

local str = dumplua(val)

out[#out+1] = str..","

end

if string.sub(out[#out], -1) == "," then

out[#out] = string.sub(out[#out], 1, -2);

end

out[#out+1] = "}"

return ""

end

else

fcts.table = function (value, ident, path)

if test_defined(value, path) then return "nil" end

-- Table value

local sep, str, numidx, totallen = " ", {}, 1, 0

local meta, metastr = (debug or getfenv()).getmetatable(value)

if meta then

ident = ident + 1

metastr = dumplua(meta, ident, "getmetatable("..path..")")

totallen = totallen + #metastr + 16

end

for _,key in pairs(keys(value)) do

local val = value[key]

local s = ""

local subpath = path

if key == numidx then

subpath = subpath .. "[" .. numidx .. "]"

numidx = numidx + 1

else

s = keycache[key]

if not s:match "^%[" then subpath = subpath .. "." end

subpath = subpath .. s:gsub("%s*=%s*$","")

end

s = s .. dumplua(val, ident+1, subpath)

str[#str+1] = s

totallen = totallen + #s + 2

end

if totallen > 80 then

sep = "\n" .. string_rep(' ', indent_step*(ident+1))

end

str = "{"..sep..table_concat(str, ","..sep).." "..sep:sub(1,-1-indent_step).."}"

if meta then

sep = sep:sub(1,-3)

return "setmetatable("..sep..str..","..sep..metastr..sep:sub(1,-3)..")"

end

return str

end

fcts['function'] = function (value, ident, path)

if test_defined(value, path) then return "nil" end

if c_functions[value] then

return c_functions[value]

elseif debug == nil or debug.getupvalue(value, 1) == nil then

return string_format("loadstring(%q)", string_dump(value))

end

closure_cnt = closure_cnt + 1

local res = {string.dump(value)}

for i = 1,math.huge do

local name, v = debug.getupvalue(value,i)

if name == nil then break end

res[i+1] = v

end

return "closure " .. dumplua(res, ident, "closures["..closure_cnt.."]")

end

end

function dumplua(value, ident, path)

return fcts[type(value)](value, ident, path)

end

if varname == nil then

varname = "return "

elseif varname:match("^[%a_][%w_]*$") then

varname = varname .. " = "

end

if fastmode then

setmetatable(keycache, {__index = make_key })

out[1] = varname

table.insert(out,dumplua(value, 0))

return table.concat(out)

else

setmetatable(keycache, {__index = make_key })

local items = {}

for i=1,10 do items[i] = '' end

items[3] = dumplua(value, ident or 0, "t")

if closure_cnt > 0 then

items[1], items[6] = dumplua_closure:match("(.*\n)\n(.*)")

out[#out+1] = ""

end

if #out > 0 then

items[2], items[4] = "local t = ", "\n"

items[5] = table.concat(out)

items[7] = varname .. "t"

else

items[2] = varname

end

return table.concat(items)

end

end

return _ENV