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local function isContainPos(obj, pos)
return obj.start <= pos and obj.finish + 1 >= pos
end
local function findResult(results, pos)
for _, var in ipairs(results.vars) do
for _, info in ipairs(var) do
if isContainPos(info.source, pos) then
return {
type = 'var',
var = var,
}
end
end
end
for _, dots in ipairs(results.dots) do
for _, info in ipairs(dots) do
if isContainPos(info.source, pos) then
return {
type = 'dots',
dots = dots,
}
end
end
end
for _, label in ipairs(results.labels) do
for _, info in ipairs(label) do
if isContainPos(info.source, pos) then
return {
type = 'label',
label = label,
}
end
end
end
return nil
end
local function tryMeta(var)
local keys = {}
repeat
if var.childs.meta then
local metavar = var.childs.meta
for i = #keys, 1, -1 do
local key = keys[i]
metavar = metavar.childs[key]
if not metavar then
return nil
end
end
return metavar
end
keys[#keys+1] = var.key
var = var.parent
until not var
return nil
end
local function parseResult(result, declarat)
local positions = {}
local tp = result.type
if tp == 'var' then
local var = result.var
for _, info in ipairs(var) do
if declarat or info.type == 'get' then
positions[#positions+1] = {info.source.start, info.source.finish}
end
end
local metavar = tryMeta(var)
if metavar then
for _, info in ipairs(metavar) do
if declarat or info.type == 'get' then
positions[#positions+1] = {info.source.start, info.source.finish}
end
end
end
elseif tp == 'dots' then
local dots = result.dots
for _, info in ipairs(dots) do
if declarat or info.type == 'get' then
positions[#positions+1] = {info.source.start, info.source.finish}
end
end
elseif tp == 'label' then
local label = result.label
for _, info in ipairs(label) do
if declarat or info.type == 'goto' then
positions[#positions+1] = {info.source.start, info.source.finish}
end
end
else
error('Unknow result type:' .. result.type)
end
return positions
end
return function (results, pos, declarat)
local result = findResult(results, pos)
if not result then
return nil
end
local positions = parseResult(result, declarat)
return positions
end
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