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local vm = require 'vm'
local util = require 'utility'
local guide = require 'parser.guide'
local function getKey(src)
if src.type == 'library' then
if src.name:sub(1, 1) == '@' then
return
end
end
local key = vm.getKeyName(src)
if not key or #key <= 2 then
if not src.index then
return '[any]'
end
local class = vm.getClass(src.index)
if class then
return ('[%s]'):format(class)
end
local tp = vm.getInferType(src.index)
if tp then
return ('[%s]'):format(tp)
end
return '[any]'
end
local ktype = key:sub(1, 2)
key = key:sub(3)
if ktype == 's|' then
if key:match '^[%a_][%w_]*$' then
return key
else
return ('[%s]'):format(util.viewLiteral(key))
end
end
return ('[%s]'):format(key)
end
local function getField(src)
if src.type == 'table'
or src.type == 'function' then
return nil
end
if src.parent then
if src.parent.type == 'tableindex'
or src.parent.type == 'setindex'
or src.parent.type == 'getindex' then
if src.parent.index == src then
src = src.parent
end
end
end
local tp = vm.getInferType(src)
local class = vm.getClass(src)
local literal = vm.getInferLiteral(src)
if type(literal) == 'string' and #literal >= 50 then
literal = literal:sub(1, 47) .. '...'
end
return class or tp, literal
end
local function buildAsHash(classes, literals)
local keys = {}
for k in pairs(classes) do
keys[#keys+1] = k
end
table.sort(keys)
local lines = {}
lines[#lines+1] = '{'
for _, key in ipairs(keys) do
local class = classes[key]
local literal = literals[key]
if literal then
lines[#lines+1] = (' %s: %s = %s,'):format(key, class, literal)
else
lines[#lines+1] = (' %s: %s,'):format(key, class)
end
end
lines[#lines+1] = '}'
return table.concat(lines, '\n')
end
local function buildAsConst(classes, literals)
local keys = {}
for k in pairs(classes) do
keys[#keys+1] = k
end
table.sort(keys, function (a, b)
return tonumber(literals[a]) < tonumber(literals[b])
end)
local lines = {}
lines[#lines+1] = '{'
for _, key in ipairs(keys) do
local class = classes[key]
local literal = literals[key]
if literal then
lines[#lines+1] = (' %s: %s = %s,'):format(key, class, literal)
else
lines[#lines+1] = (' %s: %s,'):format(key, class)
end
end
lines[#lines+1] = '}'
return table.concat(lines, '\n')
end
local function mergeLiteral(literals)
local results = {}
local mark = {}
for _, value in ipairs(literals) do
if not mark[value] then
mark[value] = true
results[#results+1] = value
end
end
if #results == 0 then
return nil
end
table.sort(results)
return table.concat(results, '|')
end
local function mergeTypes(types)
local results = {}
local mark = {
-- 讲道理table的keyvalue不会是nil
['nil'] = true,
}
for _, tv in ipairs(types) do
for tp in tv:gmatch '[^|]+' do
if not mark[tp] then
mark[tp] = true
results[#results+1] = tp
end
end
end
return guide.mergeTypes(results)
end
local function clearClasses(classes)
local knownClasses = {
['any'] = true,
['nil'] = true,
}
local anyClasses = {}
local strClasses = {}
for key, class in pairs(classes) do
if key == '[any]' then
util.array2hash(class, anyClasses)
goto CONTINUE
elseif key == '[string]' then
util.array2hash(class, strClasses)
goto CONTINUE
end
util.array2hash(class, knownClasses)
::CONTINUE::
end
for c in pairs(knownClasses) do
anyClasses[c] = nil
strClasses[c] = nil
end
if next(anyClasses) then
classes['[any]'] = util.hash2array(anyClasses)
else
classes['[any]'] = nil
end
if next(strClasses) then
classes['[string]'] = util.hash2array(strClasses)
else
classes['[string]'] = nil
end
end
return function (source)
local literals = {}
local classes = {}
local clock = os.clock()
local timeUp
for _, src in ipairs(vm.getFields(source, 'deep')) do
local key = getKey(src)
if not key then
goto CONTINUE
end
if not classes[key] then
classes[key] = {}
end
if not literals[key] then
literals[key] = {}
end
if os.clock() - clock <= 5 then
local class, literal = getField(src)
classes[key][#classes[key]+1] = class
literals[key][#literals[key]+1] = literal
else
timeUp = true
end
::CONTINUE::
end
clearClasses(classes)
for key, class in pairs(classes) do
literals[key] = mergeLiteral(literals[key])
classes[key] = mergeTypes(class)
end
if not next(classes) then
return '{}'
end
local intValue = true
for key, class in pairs(classes) do
if class ~= 'integer' or not tonumber(literals[key]) then
intValue = false
break
end
end
local result
if intValue then
result = buildAsConst(classes, literals)
else
result = buildAsHash(classes, literals)
end
-- TODO
if timeUp then
result = '\n-- TODO: Too much time has been spent, type inference has been abandoned. Optimize later.\n' .. result
end
return result
end
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