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|
--!The Automatic Cross-platform Build Tool
--
-- XMake is free software; you can redistribute it and/or modify
-- it under the terms of the GNU Lesser General Public License as published by
-- the Free Software Foundation; either version 2.1 of the License, or
-- (at your option) any later version.
--
-- XMake is distributed in the hope that it will be useful,
-- but WITHOUT ANY WARRANTY; without even the implied warranty of
-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-- GNU Lesser General Public License for more details.
--
-- You should have received a copy of the GNU Lesser General Public License
-- along with XMake;
-- If not, see <a href="http://www.gnu.org/licenses/"> http://www.gnu.org/licenses/</a>
--
-- Copyright (C) 2009 - 2015, ruki All rights reserved.
--
-- @author ruki
-- @file preprocessor.lua
--
-- define module: preprocessor
local preprocessor = preprocessor or {}
-- register configures
function preprocessor._register(env, names)
-- check
assert(env and names and type(names) == "table")
-- register all configures
for _, name in ipairs(names) do
-- register the configure
env[name] = env[name] or function(...)
-- check
local _current = env._current
assert(_current)
-- init ldflags
_current[name] = _current[name] or {}
-- get arguments
local arg = arg or {...}
if table.getn(arg) == 0 then
-- no argument
_current[name] = nil
elseif table.getn(arg) == 1 then
-- save only one argument
_current[name] = arg[1]
else
-- save all arguments
for i, v in ipairs(arg) do
_current[name][i] = v
end
end
end
end
end
-- init configures
function preprocessor._init(root, configures, scopes)
-- check
assert(root and configures)
-- enter new environment
local newenv = {}
local oldenv = getfenv()
setmetatable(newenv, {__index = _G})
setfenv(1, newenv)
-- register all configures
preprocessor._register(newenv, configures)
-- configure scope end
newenv["_end"] = function ()
-- check
assert(_current)
-- leave the current scope
_current = _current._PARENT
end
-- configure scopes
if scopes then
for _, scope_name in ipairs(scopes) do
newenv[scope_name] = function (...)
-- check
assert(_current)
-- init config name
local config_name = "_" .. scope_name:upper()
-- init scope config
_current[config_name] = _current[config_name] or {}
local scope_config = _current[config_name]
-- init scope
local scope = {}
-- configure all
local arg = arg or {...}
for _, name in ipairs(arg) do
-- check
if scope_config[name] then
-- error
utils.error("the %s: %s has been defined repeatly!", config_name, name)
assert(false)
end
-- init the scope
scope_config[name] = scope
end
-- enter scope
local parent = _current
_current = scope
_current._PARENT = parent
end
end
end
-- the root configure
newenv[root] = function ()
-- init the root scope, must be only one configs
if not newenv._CONFIGS then
newenv._CONFIGS = {}
else
-- error
utils.error("exists double %s!", root)
return
end
-- init the current scope
_current = newenv._CONFIGS
_current._PARENT = nil
end
-- enter old environment
setfenv(1, oldenv)
return newenv
end
--!load the configure file
--
-- supports:
-- xmake.xproj
-- xmake.xconf
--
-- @code
-- local configs, errors = preprocessor.loadfile("xmake.xconf", "config", {"plat", "host", "arch", ...}, {"target"})
-- local configs, errors = preprocessor.loadfile("xmake.xproj", "project", {"links", "files", "ldflags", ...}, {"target", "platforms"})
-- @endcode
function preprocessor.loadfile(path, root, configures, scopes)
-- check
assert(path and root and configures)
-- load and execute the configure file
local script = preprocessor.loadx(path)
if script then
-- init a new envirnoment
local newenv = preprocessor._init(root, configures, scopes)
assert(newenv)
-- bind this envirnoment
setfenv(script, newenv)
-- execute it
local ok, err = pcall(script)
if not ok then
-- error
return nil, err
end
-- ok?
return newenv._CONFIGS
else
-- error
return nil, string.format("load %s failed!", path)
end
end
-- return module: preprocessor
return preprocessor
|
