50 lines
1.4 KiB
Lua
50 lines
1.4 KiB
Lua
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local util = {}
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function util.deepcopy(orig)
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local orig_type = type(orig)
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local copy
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if orig_type == 'table' then
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copy = {}
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for orig_key, orig_value in next, orig, nil do
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copy[deepcopy(orig_key)] = deepcopy(orig_value)
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end
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setmetatable(copy, deepcopy(getmetatable(orig)))
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else -- number, string, boolean, etc
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copy = orig
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end
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return copy
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end
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function util.merge(bot, top)
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local p_type = type(parent)
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local c_type = type(child)
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assert(p_type == 'table', 'expected table, found '..p_type..' instead.')
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assert(c_type == 'table', 'expected table, found '..c_type..' instead.')
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for k,v in pairs(top) do
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if type(k) == 'number' and type(bot[1]) ~= nil and type(top[1]) ~= nil then
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table.insert(bot, v)
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elseif type(v) == 'table' then
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if type(bot[k]) == 'table' then
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merge(bot[k], v)
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else
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bot[k] = v
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end
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else
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bot[k] = v
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end
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end
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end
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function util.inherit(parent, child)
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local p_type = type(parent)
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local c_type = type(child)
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assert(p_type == 'table', 'expected table, found '..p_type..' instead.')
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assert(c_type == 'table', 'expected table, found '..c_type..' instead.')
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local result = util.deepcopy(parent)
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merge(result, child)
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return result
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end
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