mirror of https://github.com/minetest-mods/i3.git
76 lines
1.4 KiB
Lua
76 lines
1.4 KiB
Lua
local fmt = string.format
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local var = "[%w%.%[%]\"\'_]"
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local operators = {
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["([%+%-%*%^/&|])="] = function(a, b, c)
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return fmt("%s = %s %s %s", a, a, b, c)
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end,
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["+%+"] = function(a, b)
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return fmt("%s = %s + 1\n%s", a, a, b)
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end,
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["&"] = function(a, b)
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return fmt("bit.band(%s, %s)", a, b)
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end,
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["|"] = function(a, b)
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return fmt("bit.bor(%s, %s)", a, b)
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end,
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["<<"] = function(a, b)
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return fmt("bit.lshift(%s, %s)", a, b)
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end,
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[">>"] = function(a, b)
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return fmt("bit.rshift(%s, %s)", a, b)
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end,
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["<<="] = function(a, b)
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return fmt("%s = bit.lshift(%s, %s)", a, a, b)
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end,
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[">>="] = function(a, b)
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return fmt("%s = bit.rshift(%s, %s)", a, a, b)
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end,
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}
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local function compile(data)
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for op, func in pairs(operators) do
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data = data:gsub("(" .. var .. "+)%s?" .. op .. "%s?(" .. var .. "*)", func)
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end
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return data
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end
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local function _load(path, line, data, t)
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if line then
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if not t then
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t = data:split"\n"
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end
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t[line] = t[line]:gsub("(" .. var .. "+)%s?=%s?(" .. var .. "*)", "%2")
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data = table.concat(t, "\n")
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else
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local file = assert(io.open(path, "r"))
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data = file:read"*a"
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file:close()
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data = compile(data)
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end
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local l, err = loadstring(data)
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if not l then
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local err_line = tonumber(err:match(":(%d+):"))
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if line ~= err_line then
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return _load(path, err_line, data, t)
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end
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end
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return l, err
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end
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return function(path)
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return _load(path) or loadfile(path)
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end
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