lunapark/tests/capi/luaL_loadbuffer_proto/preamble.lua at 82f87c086022f480aea6a79c6cc7ab6cdf0ac0e1 · ligurio/lunapark · GitHub

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local DEFAULT_NUMBER = 1

local always_number = function(val)
    return tonumber(val) or DEFAULT_NUMBER
end

local not_nan_and_nil = function(val)
    return (val ~= val or val == nil) and DEFAULT_NUMBER or val
end

_G.always_number = always_number

local __add = function(v1, v2)
    return always_number(v1) + always_number(v2)
end
local __call = function(self)
    return self
end
local __concat = function(v1, v2)
    return tostring(v1) .. tostring(v2)
end
local __div = function(v1, v2)
    return always_number(v1) / always_number(v2)
end
local __index = function(self, key)
    if type(self) == 'table' then
        return rawget(self, key)
    end
    return always_number(key)
end
local __le = function(v1, v2)
    if type(v1) == 'number' and type(v2) == 'number' then
        return v1 <= v2 -- Numeric comparison.
    elseif type(v1) == 'string' and type(v2) == 'string' then
        return v1 <= v2 -- Lexicographic comparison.
    else
        return always_number(v1) <= always_number(v2)
    end
end
local __len = function(_v)
    return DEFAULT_NUMBER
end
local __lt = function(v1, v2)
    if type(v1) == 'number' and type(v2) == 'number' then
        return v1 < v2 -- Numeric comparison.
    elseif type(v1) == 'string' and type(v2) == 'string' then
        return v1 < v2 -- Lexicographic comparison.
    else
        return always_number(v1) < always_number(v2)
    end
end
local __mod = function(v1, v2)
    return always_number(v1) % always_number(v2)
end
local __mul = function(v1, v2)
    return always_number(v1) * always_number(v2)
end
local __newindex = function(self, key, value)
    if type(self) == 'table' then
        if key ~= key or key == nil then
            key = tostring(key)
        end
        rawset(self, key, value)
    end
end
local __pow = function(v1, v2)
    return always_number(v1) ^ always_number(v2)
end
local __sub = function(v1, v2)
    return always_number(v1) - always_number(v2)
end
local __unm = function(v)
    return - always_number(v)
end
local __idiv = load([[
    local v1, v2 = ...
    return always_number(v1) // always_number(v2)
]])
local __band = load([[
    local v1, v2 = ...
    return always_number(v1) & always_number(v2)
]])
local __bor = load([[
    local v1, v2 = ...
    return always_number(v1) | always_number(v2)
]])
local __bxor = load([[
    local v1, v2 = ...
    return always_number(v1) ~ always_number(v2)
]])
local __bnot = load([[
    local v = ...
    return ~always_number(v)
]])
local __shl = load([[
    local v1, v2 = ...
    return always_number(v1) << always_number(v2)
]])
local __shr = load([[
    local v1, v2 = ...
    return always_number(v1) >> always_number(v2)
]])

debug.setmetatable('string', {
    __add = __add,
    __call = __call,
    __div = __div,
    __idiv = __idiv,
    __index = __index,
    __mod = __mod,
    __mul = __mul,
    __newindex = __newindex,
    __pow = __pow,
    __sub = __sub,
    __unm = __unm,
    __band = __band,
    __bor = __bor,
    __bxor = __bxor,
    __bnot = __bnot,
    __shl = __shl,
    __shr = __shr,
})
debug.setmetatable(0, {
    __add = __add,
    __call = __call,
    __concat = __concat,
    __div = __div,
    __idiv = __idiv,
    __index = __index,
    __len = __len,
    __newindex = __newindex,
})
debug.setmetatable(nil, {
    __add = __add,
    __call = __call,
    __concat = __concat,
    __div = __div,
    __idiv = __idiv,
    __index = __index,
    __le = __le,
    __len = __len,
    __lt = __lt,
    __mod = __mod,
    __mul = __mul,
    __newindex = __newindex,
    __pow = __pow,
    __sub = __sub,
    __unm = __unm,
})
debug.setmetatable(function() end, {
    __add = __add,
    __concat = __concat,
    __div = __div,
    __idiv = __idiv,
    __index = __index,
    __le = __le,
    __len = __len,
    __lt = __lt,
    __mod = __mod,
    __mul = __mul,
    __newindex = __newindex,
    __pow = __pow,
    __sub = __sub,
    __unm = __unm,
})
debug.setmetatable(true, {
    __add = __add,
    __call = __call,
    __concat = __concat,
    __div = __div,
    __idiv = __idiv,
    __index = __index,
    __le = __le,
    __len = __len,
    __lt = __lt,
    __mod = __mod,
    __mul = __mul,
    __newindex = __newindex,
    __pow = __pow,
    __sub = __sub,
    __unm = __unm,
})
local table_mt = {
    __add = __add,
    __call = __call,
    __concat = __concat,
    __div = __div,
    __idiv = __idiv,
    __le = __le,
    __len = __len,
    __lt = __lt,
    __mod = __mod,
    __mul = __mul,
    __newindex = __newindex,
    __pow = __pow,
    __sub = __sub,
    __unm = __unm,
}

local only_numbers_cmp = function(v1, v2, cmp_op_str)
    local op_func = {
        ['<'] = function(a1, a2) return a1 < a2 end,
        ['<='] = function(a1, a2) return a1 <= a2 end,
        ['>'] = function(a1, a2) return a1 > a2 end,
        ['>='] = function(a1, a2) return a1 >= a2 end,
    }
    if type(v1) == 'number' and
       type(v2) == 'number' then
        return op_func[cmp_op_str](v1, v2)
    end
    return false
end

---------------------- END OF PREAMBLE ----------------------------