mirror of
https://github.com/appgurueu/modlib.git
synced 2024-08-20 05:14:10 +02:00
161 lines
3.5 KiB
Lua
161 lines
3.5 KiB
Lua
lua_log_file = {}
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local files = {}
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local metatable = {__index = lua_log_file}
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function lua_log_file.new(file_path, root)
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local self = setmetatable({file_path = assert(file_path), root = root}, metatable)
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if minetest then
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files[self] = true
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end
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return self
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end
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function lua_log_file:load()
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-- Bytecode is blocked by the engine
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local read = assert(loadfile(self.file_path))
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-- math.huge is serialized to inf
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local env = {inf = math.huge}
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setfenv(read, env)
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read()
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env.R = env.R or {{}}
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self.reference_count = #env.R
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self.root = env.R[1]
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self.references = modlib.table.flip(env.R)
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end
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function lua_log_file:open()
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self.file = io.open(self.file_path, "a+")
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end
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function lua_log_file:init()
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if modlib.file.exists(self.file_path) then
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self:load()
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self:_rewrite()
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self:open()
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return
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end
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self:open()
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self.root = {}
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self:_write()
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end
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function lua_log_file:log(statement)
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self.file:write(statement)
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self.file:write"\n"
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end
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function lua_log_file:flush()
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self.file:flush()
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end
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function lua_log_file:close()
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self.file:close()
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self.file = nil
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files[self] = nil
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end
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if minetest then
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minetest.register_on_shutdown(function()
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for self in pairs(files) do
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self.file:close()
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end
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end)
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end
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function lua_log_file:_dump(value, is_key)
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if value == nil then
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return "nil"
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end
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if value == true then
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return "true"
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end
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if value == false then
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return "false"
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end
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if value ~= value then
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-- nan
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return "0/0"
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end
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local _type = type(value)
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if _type == "number" then
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return ("%.17g"):format(value)
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end
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local reference = self.references[value]
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if reference then
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return "R[" .. reference .."]"
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end
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reference = self.reference_count + 1
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local key = "R[" .. reference .."]"
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local formatted
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local function create_reference()
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self.reference_count = reference
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self.references[value] = reference
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end
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if _type == "string" then
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if is_key and value:len() <= key:len() and value:match"[%a_][%a%d_]*" then
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-- Short key
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return value, true
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end
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formatted = ("%q"):format(value)
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if formatted:len() <= key:len() then
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-- Short string
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return formatted
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end
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-- Use reference
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create_reference()
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elseif _type == "table" then
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-- Tables always need a reference before they are traversed to prevent infinite recursion
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create_reference()
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local entries = {}
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for _, value in ipairs(value) do
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table.insert(entries, self:_dump(value))
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end
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local tablelen = #value
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for key, value in pairs(value) do
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if type(key) ~= "number" or key % 1 ~= 0 or key < 1 or key > tablelen then
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local dumped, short = self:_dump(key, true)
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table.insert(entries, (short and dumped or ("[" .. dumped .. "]")) .. "=" .. self:_dump(value))
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end
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end
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formatted = "{" .. table.concat(entries, ";") .. "}"
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else
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error("unsupported type: " .. _type)
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end
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self:log(key .. "=" .. formatted)
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return key
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end
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function lua_log_file:set(table, key, value)
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table[key] = value
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if not self.references[table] then
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error"orphan table"
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end
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table = self:_dump(table)
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local key, short_key = self:_dump(key, true)
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self:log(table .. (short_key and ("." .. key) or ("[" .. key .. "]")) .. "=" .. self:_dump(value))
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end
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function lua_log_file:set_root(key, value)
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return self:set(self.root, key, value)
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end
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function lua_log_file:_write()
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self.references = {}
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self.reference_count = 0
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self:log"R={}"
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self:_dump(self.root)
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end
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function lua_log_file:_rewrite()
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self.file = io.open(self.file_path, "w+")
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self:_write()
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self.file:close()
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end
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function lua_log_file:rewrite()
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if self.file then
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self.file:close()
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end
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self:_rewrite()
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self:open()
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end |