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local files = require 'files'
local guide = require 'parser.guide'
local define = require 'proto.define'
local lang = require 'language'
local function hasGet(loc)
if not loc.ref then
return false
end
local weak
for _, ref in ipairs(loc.ref) do
if ref.type == 'getlocal' then
if not ref.next then
return 'strong'
end
local nextType = ref.next.type
if nextType ~= 'setmethod'
and nextType ~= 'setfield'
and nextType ~= 'setindex' then
return 'strong'
else
weak = true
end
end
end
if weak then
return 'weak'
else
return nil
end
end
local function isMyTable(loc)
local value = loc.value
if value and value.type == 'table' then
return true
end
return false
end
local function isClose(source)
if not source.attrs then
return false
end
for _, attr in ipairs(source.attrs) do
if attr[1] == 'close' then
return true
end
end
return false
end
return function (uri, callback)
local ast = files.getAst(uri)
if not ast then
return
end
guide.eachSourceType(ast.ast, 'local', function (source)
local name = source[1]
if name == '_'
or name == '_ENV' then
return
end
if isClose(source) then
return
end
local data = hasGet(source)
if data == 'strong' then
return
end
if data == 'weak' then
if not isMyTable(source) then
return
end
end
callback {
start = source.start,
finish = source.finish,
tags = { define.DiagnosticTag.Unnecessary },
message = lang.script('DIAG_UNUSED_LOCAL', name),
}
if source.ref then
for _, ref in ipairs(source.ref) do
callback {
start = ref.start,
finish = ref.finish,
tags = { define.DiagnosticTag.Unnecessary },
message = lang.script('DIAG_UNUSED_LOCAL', name),
}
end
end
end)
end
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