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--!The Make-like Build Utility based on Lua
--
-- 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) 2015 - 2016, ruki All rights reserved.
--
-- @author ruki
-- @file pairs.lua
--
-- load modules
local table = require("base/table")
-- pairs
--
-- .e.g
--
-- @code
--
-- local t = {a = "a", b = "b", c = "c", d = "d", e = "e", f = "f"}
--
-- for key, val in pairs(t) do
-- print("%s: %s", key, val)
-- end
--
-- for key, val in pairs(t, function (v) return v:upper() end) do
-- print("%s: %s", key, val)
-- end
--
-- for key, val in pairs(t, function (v, a, b) return v:upper() .. a .. b end, "a", "b") do
-- print("%s: %s", key, val)
-- end
--
-- @endcode
--
function sandbox_pairs(t, filter, ...)
-- has filter?
local has_filter = type(filter) == "function"
-- init iterator
local args = {...}
local iter = function (t, i)
local k, v = next(t, i)
if v and has_filter then
v = filter(v, unpack(args))
end
return k, v
end
-- return iterator and initialized state
return iter, table.wrap(t), nil
end
-- load module
return sandbox_pairs
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