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|
local localMgr = require 'vm.local-manager'
---@class vm.union
local mt = {}
mt.__index = mt
mt.type = 'vm.union'
mt.optional = nil
mt.lastInfer = nil
---@param me vm.node
---@param node vm.node
---@return vm.union
local function createUnion(me, node)
local union = setmetatable({}, mt)
union:merge(me)
union:merge(node)
return union
end
---@param node vm.node
function mt:merge(node)
if not node then
return
end
if node.type == 'vm.union' then
for _, c in ipairs(node) do
if not self[c] then
self[c] = true
self[#self+1] = c
end
end
if node:isOptional() then
self.optional = true
end
else
if not self[node] then
self[node] = true
self[#self+1] = node
end
end
end
---@return vm.node
function mt:copy()
return createUnion(self, nil)
end
---@return boolean
function mt:isEmpty()
return #self == 0
end
---@param source parser.object
function mt:subscribeLocal(source)
for _, c in ipairs(self) do
localMgr.subscribeLocal(source, c)
end
end
function mt:eachNode()
local i = 0
return function ()
i = i + 1
return self[i]
end
end
---@return vm.union
function mt:addOptional()
if self:isOptional() then
return self
end
self.optional = true
return self
end
---@return vm.union
function mt:removeOptional()
self.optional = nil
if not self:isOptional() then
return self
end
-- copy union
local newUnion = createUnion()
for _, n in ipairs(self) do
if n.type == 'nil' then
goto CONTINUE
end
if n.type == 'boolean' then
if n[1] == false then
goto CONTINUE
end
end
if n.type == 'false' then
goto CONTINUE
end
newUnion[#newUnion+1] = n
::CONTINUE::
end
newUnion.optional = false
return newUnion
end
---@return boolean
function mt:isOptional()
if self.optional ~= nil then
return self.optional
end
for _, c in ipairs(self) do
if c.type == 'nil' then
self.optional = true
return true
end
if c.type == 'boolean' then
if c[1] == false then
self.optional = true
return true
end
end
if c.type == 'false' then
self.optional = true
return true
end
end
self.optional = false
return false
end
return createUnion
|
