mirror of
https://github.com/koreader/koreader
synced 2024-11-16 06:12:56 +00:00
83 lines
2.7 KiB
Lua
83 lines
2.7 KiB
Lua
--[[--
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A simple serialization function which won't do uservalues, functions, or loops.
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]]
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local isUbuntuTouch = os.getenv("UBUNTU_APPLICATION_ISOLATION") ~= nil
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local insert = table.insert
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local indent_prefix = " "
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local function _serialize(what, outt, indent, max_lv, history)
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if not max_lv then
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max_lv = math.huge
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end
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if indent > max_lv then
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return
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end
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if type(what) == "table" then
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history = history or {}
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for up, item in ipairs(history) do
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if item == what then
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insert(outt, "nil --[[ LOOP:\n")
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insert(outt, string.rep(indent_prefix, indent - up))
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insert(outt, "^------- ]]")
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return
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end
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end
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local new_history = { what, unpack(history) }
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local didrun = false
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insert(outt, "{")
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for k, v in pairs(what) do
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if didrun then
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insert(outt, ",")
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end
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insert(outt, "\n")
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insert(outt, string.rep(indent_prefix, indent+1))
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insert(outt, "[")
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_serialize(k, outt, indent+1, max_lv, new_history)
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insert(outt, "] = ")
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_serialize(v, outt, indent+1, max_lv, new_history)
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didrun = true
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end
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if didrun then
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insert(outt, "\n")
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insert(outt, string.rep(indent_prefix, indent))
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end
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insert(outt, "}")
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elseif type(what) == "string" then
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insert(outt, string.format("%q", what))
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elseif type(what) == "number" then
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if isUbuntuTouch then
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-- FIXME: the `SDL_CreateRenderer` function in Ubuntu touch somehow
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-- use a strange locale that formats number like this: 1.10000000000000g+02
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-- which cannot be recognized by loadfile after the number is dumped.
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-- Here the workaround is to preserve enough precision in "%.13e" format.
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insert(outt, string.format("%.13e", what))
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else
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insert(outt, tostring(what))
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end
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elseif type(what) == "boolean" then
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insert(outt, tostring(what))
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elseif type(what) == "function" then
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insert(outt, tostring(what))
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elseif type(what) == "nil" then
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insert(outt, "nil")
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end
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end
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--[[--Serializes whatever is in `data` to a string that is parseable by Lua.
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You can optionally specify a maximum recursion depth in `max_lv`.
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@function dump
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@param data the object you want serialized (table, string, number, boolean, nil)
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@param max_lv optional maximum recursion depth
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--]]
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local function dump(data, max_lv)
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local out = {}
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_serialize(data, out, 0, max_lv)
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return table.concat(out)
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end
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return dump
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