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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 matchFilter(source, filter)
if not filter then
return true
end
return filter[source.type]
end
local function findAtPos(vm, pos, filter)
local res = {}
vm:eachSource(function (source)
if isValidSource(source)
and isContainPos(source, pos)
and matchFilter(source, filter)
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
elseif a.type == 'call' and #a == 1 and a[1] == b then
return false
else
return a.id < b.id
end
end
return rangeA < rangeB
end)
local source = res[1]
if not source then
return nil
end
return source
end
return function (vm, pos, filter)
return findAtPos(vm, pos, filter)
end
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