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local state = require 'vm.state'
---@class vm.node.union
local mt = {}
mt.__index = mt
mt.type = 'union'
---@param source parser.object
---@param node vm.node
function mt:merge(source, node)
if not node then
return
end
if node.type == 'union' then
for _, c in ipairs(node) do
self[#self+1] = c
end
else
self[#self+1] = node
end
end
---@param source parser.object
function mt:subscribeLiteral(source)
for _, c in ipairs(self) do
state.subscribeLiteral(source, c)
if c.type == 'cross' then
c:subscribeLiteral(source)
end
end
end
---@param source parser.object
---@param node vm.node
---@return vm.node.union
return function (source, node)
local union = setmetatable({
source,
}, mt)
union:merge(source, node)
return union
end
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