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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 ipairs.lua
--
-- load modules
local table = require("base/table")
-- ipairs
--
-- .e.g
--
-- @code
--
-- for idx, val in ipairs({"a", "b", "c", "d", "e", "f"}) do
-- print("%d %s", idx, val)
-- end
--
-- for idx, val in ipairs({"a", "b", "c", "d", "e", "f"}, function (v) return v:upper() end) do
-- print("%d %s", idx, val)
-- end
--
-- for idx, val in ipairs({"a", "b", "c", "d", "e", "f"}, function (v, a, b) return v:upper() .. a .. b end, "a", "b") do
-- print("%d %s", idx, val)
-- end
--
-- @endcode
function sandbox_ipairs(t, filter, ...)
-- has filter?
local has_filter = type(filter) == "function"
-- init iterator
local args = {...}
local iter = function (t, i)
i = i + 1
local v = t[i]
if v then
if has_filter then
v = filter(v, unpack(args))
end
return i, v
end
end
-- return iterator and initialized state
return iter, table.wrap(t), 0
end
-- load module
return sandbox_ipairs
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