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---@class vm
local vm = require 'vm.vm'
local guide = require 'parser.guide'
local globalMgr = require 'vm.global-manager'
---@class vm.runner
---@field loc parser.object
---@field mainBlock parser.object
---@field blocks table<parser.object, true>
---@field steps vm.runner.step[]
local mt = {}
mt.__index = mt
mt.index = 1
---@class parser.object
---@field _hasSorted boolean
---@class vm.runner.step
---@field type 'truly' | 'falsy' | 'as' | 'add' | 'remove' | 'object' | 'save' | 'load' | 'merge'
---@field pos integer
---@field order? integer
---@field node? vm.node
---@field object? parser.object
---@field name? string
---@field copy? boolean
---@field ref1? vm.runner.step
---@field ref2? vm.runner.step
---@param filter parser.object
---@param pos integer
function mt:_compileNarrowByFilter(filter, pos)
if not filter then
return
end
if filter.type == 'paren' then
if filter.exp then
self:_compileNarrowByFilter(filter.exp, pos)
end
return
end
if filter.type == 'unary' then
if not filter.op
or not filter[1] then
return
end
if filter.op.type == 'not' then
local exp = filter[1]
if exp.type == 'getlocal' and exp.node == self.loc then
self.steps[#self.steps+1] = {
type = 'truly',
pos = pos,
order = 2,
}
self.steps[#self.steps+1] = {
type = 'falsy',
pos = pos,
order = 4,
}
end
end
elseif filter.type == 'binary' then
if not filter.op
or not filter[1]
or not filter[2] then
return
end
if filter.op.type == 'and' then
self:_compileNarrowByFilter(filter[1], pos)
self:_compileNarrowByFilter(filter[2], pos)
end
if filter.op.type == '=='
or filter.op.type == '~=' then
local loc, exp
for i = 1, 2 do
loc = filter[i]
if loc.type == 'getlocal' and loc.node == self.loc then
exp = filter[i % 2 + 1]
break
end
end
if not loc or not exp then
return
end
if exp.type == 'nil' then
if filter.op.type == '==' then
self.steps[#self.steps+1] = {
type = 'remove',
name = 'nil',
pos = pos,
order = 2,
}
self.steps[#self.steps+1] = {
type = 'as',
name = 'nil',
pos = pos,
order = 4,
}
end
if filter.op.type == '~=' then
self.steps[#self.steps+1] = {
type = 'as',
name = 'nil',
pos = pos,
order = 2,
}
self.steps[#self.steps+1] = {
type = 'remove',
name = 'nil',
pos = pos,
order = 4,
}
end
end
end
else
if filter.type == 'getlocal' and filter.node == self.loc then
self.steps[#self.steps+1] = {
type = 'falsy',
pos = pos,
order = 2,
}
self.steps[#self.steps+1] = {
type = 'truly',
pos = pos,
order = 4,
}
end
end
end
---@param block parser.object
function mt:_compileBlock(block)
if self.blocks[block] then
return
end
self.blocks[block] = true
if block == self.mainBlock then
return
end
local parentBlock = guide.getParentBlock(block)
self:_compileBlock(parentBlock)
if block.type == 'if' then
---@type vm.runner.step[]
local finals = {}
for _, childBlock in ipairs(block) do
if #childBlock > 0 then
local initState = {
type = 'save',
copy = true,
pos = childBlock.start,
order = 1,
}
local outState = {
type = 'save',
copy = true,
pos = childBlock.start,
order = 2,
}
local filterState = {
type = 'save',
copy = true,
pos = childBlock.start,
order = 3,
}
self.steps[#self.steps+1] = initState
self.steps[#self.steps+1] = outState
self.steps[#self.steps+1] = filterState
self.steps[#self.steps+1] = {
type = 'load',
ref1 = outState,
pos = childBlock[1].start - 1,
order = 1,
}
self.steps[#self.steps+1] = {
type = 'load',
ref1 = initState,
pos = childBlock[1].start - 1,
order = 3,
}
self:_compileNarrowByFilter(childBlock.filter, childBlock[1].start - 1)
if childBlock.returns then
self.steps[#self.steps+1] = {
type = 'load',
ref1 = outState,
pos = childBlock.finish,
order = 1,
}
else
local finalState = {
type = 'save',
pos = childBlock.finish,
order = 1,
}
finals[#finals+1] = finalState
self.steps[#self.steps+1] = finalState
self.steps[#self.steps+1] = {
type = 'load',
ref1 = outState,
pos = childBlock.finish,
order = 2,
}
end
end
end
for i, final in ipairs(finals) do
self.steps[#self.steps+1] = {
type = 'merge',
ref1 = final,
pos = block.finish,
order = i,
}
end
end
if block.type == 'function' then
local savePoint = {
type = 'save',
copy = true,
pos = block.start,
}
self.steps[#self.steps+1] = savePoint
self.steps[#self.steps+1] = {
type = 'load',
pos = block.finish,
ref1 = savePoint,
}
end
end
function mt:_preCompile()
for _, ref in ipairs(self.loc.ref) do
self.steps[#self.steps+1] = {
type = 'object',
object = ref,
pos = ref.range or ref.start,
}
local block = guide.getParentBlock(ref)
self:_compileBlock(block)
end
table.sort(self.steps, function (a, b)
if a.pos == b.pos then
return (a.order or 0) < (b.order or 0)
else
return a.pos < b.pos
end
end)
end
---@param callback fun(src: parser.object, node: vm.node)
function mt:launch(callback)
local node = vm.getNode(self.loc):copy()
for _, step in ipairs(self.steps) do
if step.copy then
node = node:copy()
end
if step.type == 'truly' then
node:setTruly()
elseif step.type == 'falsy' then
node:setFalsy()
elseif step.type == 'as' then
node = vm.createNode(globalMgr.getGlobal('type', step.name))
elseif step.type == 'add' then
node:merge(globalMgr.getGlobal('type', step.name))
elseif step.type == 'remove' then
node:remove(step.name)
elseif step.type == 'object' then
node = callback(step.object, node) or node
elseif step.type == 'save' then
-- nothing to do
elseif step.type == 'load' then
node = step.ref1.node
elseif step.type == 'merge' then
node:merge(step.ref1.node)
end
step.node = node
end
end
---@param loc parser.object
---@return vm.runner
function vm.createRunner(loc)
local self = setmetatable({
loc = loc,
mainBlock = guide.getParentBlock(loc),
blocks = {},
steps = {},
}, mt)
self:_preCompile()
return self
end
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