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local createValue = require 'vm.value'
local mt = {}
mt.__index = mt
mt.type = 'multi'
function mt:push(value, isLast)
if value.type == 'list' then
if isLast then
for _, v in ipairs(value) do
self[#self+1] = v
end
else
self[#self+1] = value[1]
end
else
self[#self+1] = value
end
end
function mt:get(index)
for n = #self+1, index do
self[n] = createValue('any')
end
return self[index]
end
function mt:set(index, value)
for n = #self+1, index-1 do
self[n] = createValue('any')
end
self[index] = value
end
function mt:first()
local value = self[1]
if not value then
return createValue('nil')
end
if value.type == 'multi' then
return value:first()
else
return value
end
end
function mt:eachValue(callback)
local i = 0
for n, value in ipairs(self) do
if value.type == 'multi' then
if n == #self then
value:eachValue(function (_, nvalue)
i = i + 1
callback(i, nvalue)
end)
else
i = i + 1
value:first()
end
else
i = i + 1
callback(i, value)
end
end
end
function mt:merge(other)
other:eachValue(function (_, value)
self:push(value)
end)
end
return function ()
local self = setmetatable({}, mt)
return self
end
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