85 lines
2.2 KiB
Lua
85 lines
2.2 KiB
Lua
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local files = require 'files'
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local guide = require 'parser.guide'
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local vm = require 'vm'
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local lang = require 'language'
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local await = require 'await'
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local define = require 'proto.define'
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---@param source parser.object
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---@return boolean
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local function allLiteral(source)
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local result = true
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guide.eachSource(source, function (src)
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if src.type ~= 'unary'
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and src.type ~= 'binary'
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and not guide.isLiteral(src) then
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result = false
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return false
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end
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end)
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return result
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end
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---@param block parser.object
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---@return boolean
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local function hasReturn(block)
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if block.hasReturn or block.hasError then
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return true
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end
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if block.type == 'if' then
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local hasElse
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for _, subBlock in ipairs(block) do
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if not hasReturn(subBlock) then
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return false
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end
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if subBlock.type == 'elseblock' then
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hasElse = true
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end
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end
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return hasElse == true
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else
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if block.type == 'while' then
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if vm.testCondition(block.filter)
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and not block.breaks
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and allLiteral(block.filter) then
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return true
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end
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end
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for _, action in ipairs(block) do
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if guide.isBlockType(action) then
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if hasReturn(action) then
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return true
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end
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end
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end
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end
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return false
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end
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---@async
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return function (uri, callback)
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local state = files.getState(uri)
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if not state then
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return
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end
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---@async
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guide.eachSourceTypes(state.ast, {'main', 'function'}, function (source)
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await.delay()
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for i, action in ipairs(source) do
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if guide.isBlockType(action)
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and hasReturn(action) then
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if i < #source then
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callback {
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start = source[i+1].start,
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finish = source[#source].finish,
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tags = { define.DiagnosticTag.Unnecessary },
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message = lang.script('DIAG_UNREACHABLE_CODE'),
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}
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end
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return
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end
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end
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end)
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end
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