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--!A cross-platform build utility based on Lua
--
-- Licensed to the Apache Software Foundation (ASF) under one
-- or more contributor license agreements. See the NOTICE file
-- distributed with this work for additional information
-- regarding copyright ownership. The ASF licenses this file
-- to you under the Apache License, Version 2.0 (the
-- "License"); you may not use this file except in compliance
-- with the License. You may obtain a copy of the License at
--
-- http://www.apache.org/licenses/LICENSE-2.0
--
-- Unless required by applicable law or agreed to in writing, software
-- distributed under the License is distributed on an "AS IS" BASIS,
-- WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-- See the License for the specific language governing permissions and
-- limitations under the License.
--
-- Copyright (C) 2015 - 2018, TBOOX Open Source Group.
--
-- @author ruki
-- @file depend.lua
--
-- load dependent info from the given file (.d)
function load(dependfile)
return os.isfile(dependfile) and io.load(dependfile) or nil
end
-- save dependent info to file
function save(dependinfo, dependfile)
io.save(dependfile, dependinfo)
end
-- the dependent info is changed?
--
-- if not depend.is_changed(dependinfo, {filemtime = os.mtime(objectfile), values = {...}}) then
-- return
-- end
--
function is_changed(dependinfo, opt)
-- empty depend info? always be changed
local files = dependinfo.files or {}
local values = dependinfo.values or {}
if #files == 0 and #values == 0 then
return true
end
-- check the dependent files are changed?
local lastmtime = nil
_g.file_results = _g.file_results or {}
for _, file in ipairs(files) do
-- optimization: this file has been not checked?
local status = _g.file_results[file]
if status == nil then
-- optimization: only uses the mtime of first object file
lastmtime = lastmtime or opt.lastmtime or 0
-- source and header files have been changed?
if os.mtime(file) > lastmtime then
-- mark this file as changed
_g.file_results[file] = true
return true
end
-- mark this file as not changed
_g.file_results[file] = false
-- has been checked and changed?
elseif status then
return true
end
end
-- check the dependent values are changed?
local depvalues = values
local optvalues = opt.values or {}
if #depvalues ~= #optvalues then
return true
end
for idx, depvalue in ipairs(depvalues) do
local optvalue = optvalues[idx]
local deptype = type(depvalue)
local opttype = type(optvalue)
if deptype ~= opttype then
return true
elseif deptype == "string" and depvalue ~= optvalue then
return true
elseif deptype == "table" then
for subidx, subvalue in ipairs(depvalue) do
if subvalue ~= optvalue[subidx] then
return true
end
end
end
end
end
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