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local function isContainPos(obj, pos)
if obj.start <= pos and obj.finish >= pos then
return true
end
return false
end
local function isValidSource(source)
return source.start ~= nil and source.start ~= 0
end
local function findAtPos(sources, pos, level)
local res = {}
for _, source in ipairs(sources) do
if isValidSource(source) and isContainPos(source, pos) then
res[#res+1] = source
end
end
if #res == 0 then
return nil
end
table.sort(res, function (a, b)
if a == b then
return false
end
local rangeA = a.finish - a.start
local rangeB = b.finish - b.start
-- 特殊处理：func 'str' 的情况下，list与string的范围会完全相同，此时取string
if rangeA == rangeB then
if b.type == 'call' and #b == 1 and b[1] == a then
return true
else
return false
end
end
return rangeA < rangeB
end)
local source = res[level or 1]
if not source then
return nil
end
return source
end
return function (vm, pos, level)
return findAtPos(vm.sources, pos, level)
end
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