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---@class vm
local vm = require 'vm.vm'
local guide = require 'parser.guide'
---@alias vm.runner.callback fun(src: parser.object, node: vm.node)
---@class vm.runner
---@field _loc parser.object
---@field _objs parser.object[]
---@field _callback vm.runner.callback
local mt = {}
mt.__index = mt
mt._index = 1
---@return parser.object[]
function mt:_getCasts()
local root = guide.getRoot(self._loc)
if not root._casts then
root._casts = {}
local docs = root.docs
for _, doc in ipairs(docs) do
if doc.type == 'doc.cast' and doc.loc then
root._casts[#root._casts+1] = doc
end
end
end
return root._casts
end
function mt:_collect()
local startPos = self._loc.start
local finishPos = 0
for _, ref in ipairs(self._loc.ref) do
if ref.type == 'getlocal'
or ref.type == 'setlocal' then
self._objs[#self._objs+1] = ref
if ref.start > finishPos then
finishPos = ref.start
end
end
end
if #self._objs == 0 then
return
end
local casts = self:_getCasts()
for _, cast in ipairs(casts) do
if cast.loc[1] == self._loc[1]
and cast.start > startPos
and cast.finish < finishPos
and guide.getLocal(self._loc, self._loc[1], cast.start) == self._loc then
self._objs[#self._objs+1] = cast
end
end
table.sort(self._objs, function (a, b)
return (a.range or a.start) < (b.range or b.start)
end)
end
---@param pos integer
---@param node vm.node
---@return vm.node
---@return parser.object?
function mt:_fastWard(pos, node)
for i = self._index, #self._objs do
local obj = self._objs[i]
if obj.start > pos then
self._index = i
return node, obj
end
if obj.type == 'getlocal' then
self._callback(obj, node)
elseif obj.type == 'setlocal' then
local newNode = self._callback(obj, node)
if newNode then
node = newNode:copy()
end
else
error('unexpected type: ' .. obj.type)
end
end
self._index = math.huge
return node, nil
end
---@param action parser.object
---@param topNode vm.node
---@param outNode? vm.node
---@return vm.node
function mt:_lookInto(action, topNode, outNode)
action = vm.getObjectValue(action) or action
if action.type == 'function' then
self:_launchBlock(action, topNode:copy())
elseif action.type == 'if' then
local mainNode = topNode:copy()
local blockNode = topNode:copy()
for _, subBlock in ipairs(action) do
if subBlock.type == 'ifblock' then
blockNode, mainNode = self:_lookInto(subBlock.filter, blockNode, mainNode)
local neverReturn
blockNode, neverReturn = self:_launchBlock(subBlock, blockNode)
if not neverReturn then
mainNode:merge(blockNode)
end
end
end
topNode = mainNode
elseif action.type == 'getlocal' then
if action.node == self._loc then
topNode = self:_fastWard(action.finish, topNode)
topNode = topNode:copy():setTruthy()
if outNode then
outNode:setFalsy()
end
end
elseif action.type == 'unary' then
if not action[1] then
return topNode, outNode
end
if action.op.type == 'not' then
outNode, topNode = self:_lookInto(action[1], topNode, outNode)
end
elseif action.type == 'binary' then
if not action[1] or not action[2] then
return topNode, outNode
end
if action.op.type == 'and' then
topNode = self:_lookInto(action[1], topNode)
topNode = self:_lookInto(action[2], topNode)
elseif action.op.type == '=='
or action.op.type == '~=' then
local loc, checker
for i = 1, 2 do
if action[i].type == 'getlocal' and action[i].node == self._loc then
loc = action[i]
checker = action[3-i] -- Copilot tells me use `3-i` instead of `i%2+1`
else
loc = action[3-i]
checker = action[i]
end
end
if loc then
if guide.isLiteral(checker) then
local checkerNode = vm.compileNode(checker)
if action.op.type == '==' then
topNode = checkerNode
if outNode then
outNode:removeNode(topNode)
end
else
topNode:removeNode(checkerNode)
if outNode then
outNode = checkerNode
end
end
end
end
end
end
return topNode, outNode
end
---@param block parser.object
---@param node vm.node
---@return vm.node
---@return boolean neverReturn
function mt:_launchBlock(block, node)
local neverReturn = false
local topNode, top = self:_fastWard(block.start, node)
if not top then
return topNode, neverReturn
end
for _, action in ipairs(block) do
if action.type == 'return'
or action.type == 'goto' then
neverReturn = true
end
local finish = action.range or action.finish
if finish < top.start then
goto CONTINUE
end
topNode = self:_lookInto(action, topNode)
topNode, top = self:_fastWard(action.finish, topNode)
if not top then
return topNode, neverReturn
end
::CONTINUE::
end
topNode = self:_fastWard(block.finish, topNode)
return topNode, neverReturn
end
---@param loc parser.object
---@param callback vm.runner.callback
function vm.launchRunner(loc, callback)
local self = setmetatable({
_loc = loc,
_objs = {},
_callback = callback,
}, mt)
self:_collect()
if #self._objs == 0 then
return
end
self:_launchBlock(guide.getParentBlock(loc), vm.getNode(loc):copy())
end
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