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|
local union = require 'vm.union'
local files = require 'files'
---@alias vm.node parser.object | vm.node.union | vm.node.global | vm.generic
---@class vm.node-manager
local m = {}
local DUMMY_FUNCTION = function () end
---@type table<parser.object, vm.node>
m.nodeCache = {}
---@param a vm.node
---@param b vm.node
function m.mergeNode(a, b)
if not b then
return a
end
if not a then
return b
end
return union(a, b)
end
---@param source parser.object
---@param node vm.node
---@param cover? boolean
function m.setNode(source, node, cover)
if cover then
m.nodeCache[source] = node
return
end
if not node then
return
end
local me = m.nodeCache[source]
if not me then
m.nodeCache[source] = node
return
end
if me == node then
return
end
m.nodeCache[source] = m.mergeNode(me, node)
end
function m.getNode(source)
return m.nodeCache[source]
end
---@param node vm.node
---@return vm.node.union
function m.addOptional(node)
if not node or node.type ~= 'union' then
node = union(node)
end
node = node:addOptional()
return node
end
---@param node vm.node
---@return vm.node.union?
function m.removeOptional(node)
if not node then
return node
end
if node.type ~= 'union' then
node = union(node)
end
node = node:removeOptional()
return node
end
---@return fun():vm.node
function m.eachNode(node)
if not node then
return DUMMY_FUNCTION
end
if node.type == 'union' then
return node:eachNode()
end
local first = true
return function ()
if first then
first = false
return node
end
return nil
end
end
function m.clearNodeCache()
m.nodeCache = {}
end
files.watch(function (ev, uri)
if ev == 'version' then
m.clearNodeCache()
end
end)
return m
|
