503 lines
12 KiB
C++
Executable File
503 lines
12 KiB
C++
Executable File
// Copyright (c) 2016 Klemens D. Morgenstern
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//
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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#ifndef BOOST_PROCESS_DETAIL_ENV_HPP_
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#define BOOST_PROCESS_DETAIL_ENV_HPP_
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#include <boost/process/environment.hpp>
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#include <boost/none.hpp>
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#if defined(BOOST_POSIX_API)
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#include <boost/process/detail/posix/env_init.hpp>
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#elif defined(BOOST_WINDOWS_API)
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#include <boost/process/detail/windows/env_init.hpp>
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#endif
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/** \file boost/process/env.hpp
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*
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* This header which provides the `env` property. It allows the modification of the
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* environment the child process will run in, in a functional style.
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*
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* \xmlonly
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<programlisting>
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namespace boost {
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namespace process {
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<emphasis>unspecified</emphasis> <globalname alt="boost::process::env">env</globalname>;
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}
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}
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</programlisting>
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* \endxmlonly
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*
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* For additional information see the platform documentations:
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*
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* - [windows](https://msdn.microsoft.com/en-US/library/windows/desktop/ms682653.aspx)
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* - [posix](http://pubs.opengroup.org/onlinepubs/009695399/basedefs/xbd_chap08.html)
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*
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*/
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namespace boost {
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namespace process { namespace detail {
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template<typename Char>
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std::size_t make_env_string_size(const std::basic_string<Char> & ch)
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{
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return ch.size() + 1;
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}
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template<typename Char>
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std::size_t make_env_string_size(const Char * ch)
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{
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std::size_t sz = 0;
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while (ch[sz] != null_char<Char>())
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sz++;
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sz++;
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return sz;
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}
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template<typename Char, typename Container>
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inline std::basic_string<Char> make_env_string(const Container & value)
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{
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std::size_t sz = 0;
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for (auto & v : value)
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sz += make_env_string_size(v);
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std::basic_string<Char> s;
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s.reserve(sz); //+1 for ;, end doesn't have one.
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for (auto & val : value)
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(s += val) += api::env_seperator<Char>();
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s.resize(s.size() -1); //remove last ';'
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return s;
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}
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template<typename Char>
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struct env_set
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{
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using string_type = std::basic_string<Char>;
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string_type key;
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string_type value;
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};
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template<typename Char>
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struct env_append
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{
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using string_type = std::basic_string<Char>;
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string_type key;
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string_type value;
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};
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template<typename Char>
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struct env_reset
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{
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using string_type = std::basic_string<Char>;
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string_type key;
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};
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template<> struct is_wchar_t<env_set<wchar_t>> : std::true_type {};
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template<> struct is_wchar_t<env_append<wchar_t>> : std::true_type {};
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template<> struct is_wchar_t<env_reset<wchar_t>> : std::true_type {};
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template<> struct is_wchar_t<basic_environment<wchar_t>> : std::true_type {};
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template<>
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struct char_converter<char, env_set<wchar_t>>
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{
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static env_set<char> conv(const env_set<wchar_t> & in)
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{
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return {::boost::process::detail::convert(in.key),
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::boost::process::detail::convert(in.value)};
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}
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};
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template<>
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struct char_converter<wchar_t, env_set<char>>
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{
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static env_set<wchar_t> conv(const env_set<char> & in)
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{
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return {::boost::process::detail::convert(in.key),
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::boost::process::detail::convert(in.value)};
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}
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};
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template<>
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struct char_converter<char, env_append<wchar_t>>
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{
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static env_append<char> conv(const env_append<wchar_t> & in)
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{
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return {::boost::process::detail::convert(in.key),
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::boost::process::detail::convert(in.value)};
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}
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};
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template<>
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struct char_converter<wchar_t, env_append<char>>
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{
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static env_append<wchar_t> conv(const env_append<char> & in)
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{
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return {::boost::process::detail::convert(in.key),
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::boost::process::detail::convert(in.value)};
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}
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};
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template<>
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struct char_converter<char, env_reset<wchar_t>>
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{
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static env_reset<char> conv(const env_reset<wchar_t> & in)
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{
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return {::boost::process::detail::convert(in.key)};
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}
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};
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template<>
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struct char_converter<wchar_t, env_reset<char>>
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{
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static env_reset<wchar_t> conv(const env_reset<char> & in)
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{
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return {::boost::process::detail::convert(in.key)};
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}
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};
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template<typename Char>
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struct env_init
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{
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basic_environment<Char> env;
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};
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template<>
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struct char_converter<char, env_init<wchar_t>>
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{
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static env_init<char> conv(const env_init<wchar_t> & in)
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{
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return {basic_environment<char>(in.env)};
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}
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};
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template<>
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struct char_converter<wchar_t, env_init<char>>
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{
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static env_init<wchar_t> conv(const env_init<char> & in)
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{
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return {basic_environment<wchar_t>(in.env)};
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}
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};
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template<>
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struct char_converter<char, basic_environment<wchar_t>>
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{
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static basic_environment<char> conv(const basic_environment<wchar_t> & in)
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{
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return { basic_environment<char>(in) };
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}
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};
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template<>
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struct char_converter<wchar_t, basic_environment<char>>
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{
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static basic_environment<wchar_t> conv(const basic_environment<char> & in)
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{
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return { basic_environment<wchar_t>(in) };
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}
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};
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template<typename Char>
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struct env_proxy
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{
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using string_type = std::basic_string<Char>;
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string_type key;
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env_set<Char> operator=(const string_type & value)
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{
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return {std::move(key), value};
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}
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env_set<Char> operator=(const std::vector<string_type> & value)
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{
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return {std::move(key), make_env_string<Char>(value)};
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}
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env_set<Char> operator=(const std::initializer_list<const Char*> & value)
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{
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return {std::move(key), make_env_string<Char>(value)};
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}
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env_append<Char> operator+=(const string_type & value)
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{
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return {std::move(key), value};
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}
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env_append<Char> operator+=(const std::vector<string_type> & value)
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{
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return {std::move(key), make_env_string<Char>(value)};
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}
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env_append<Char> operator+=(const std::initializer_list<const Char*> & value)
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{
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return {std::move(key), make_env_string<Char>(value)};
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}
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env_reset<Char> operator=(boost::none_t)
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{
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return {std::move(key)};
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}
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};
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struct env_
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{
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constexpr env_() {};
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template<typename Char>
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env_set<Char> operator()(const std::basic_string<Char> & key,
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const std::basic_string<Char> & value) const
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{
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return {key, value};
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}
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template<typename Char>
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env_set<Char> operator()(const std::basic_string<Char> & key,
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const std::vector<std::basic_string<Char>> & value) const
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{
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return {key, make_env_string<Char>(value)};
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}
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template<typename Char>
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env_set<Char> operator()(const std::basic_string<Char> & key,
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const std::initializer_list<Char*> & value) const
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{
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return {key, make_env_string<Char>(value)};
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}
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template<typename Char>
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env_reset<Char> operator()(const std::basic_string<Char> & key, boost::none_t)
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{
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return {key};
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}
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template<typename Char>
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env_proxy<Char> operator[](const std::basic_string<Char> & key) const
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{
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return {key};
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}
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template<typename Char>
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env_proxy<Char> operator[](const Char* key) const
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{
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return {key};
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}
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template<typename Char>
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env_init<Char> operator()(const basic_environment<Char> & env) const
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{
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return {env};
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}
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template<typename Char>
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env_init<Char> operator= (const basic_environment<Char> & env) const
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{
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return {env};
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}
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};
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template<typename Char>
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struct env_builder
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{
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basic_environment<Char> env;
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env_builder() : env{basic_native_environment<Char>()} {}
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void operator()(const basic_environment<Char> & e)
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{
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env = e;
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}
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void operator()(env_init<Char> & ei)
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{
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env = std::move(ei.env);
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}
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void operator()(env_set<Char> & es)
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{
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env[es.key] = es.value;
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}
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void operator()(env_reset<Char> & es)
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{
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env.erase(es.key);
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}
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template<typename T>
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void operator()(env_append<T> & es)
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{
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env[es.key] += es.value;
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}
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typedef api::env_init<Char> result_type;
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api::env_init<Char> get_initializer()
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{
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return api::env_init<Char>(std::move(env));
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}
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};
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template<>
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struct initializer_builder<env_tag<char>>
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{
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typedef env_builder<char> type;
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};
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template<>
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struct initializer_builder<env_tag<wchar_t>>
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{
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typedef env_builder<wchar_t> type;
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};
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}
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/**
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The `env` property provides a functional way to modify the environment used by
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the child process. If none is passed the environment is inherited from the father
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process. Appending means that the environment will be interpreted as a ';' or ':'
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separated list as used in `PATH`.
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On both `posix` and `windows` the environment variables can be lists of strings,
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separated by ';'. This is typically used for the `PATH` variable.
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By default the environment will be inherited from the launching process,
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which is also true if environment are modified with this initializer.
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\section env_details Details
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\subsection env_operations Operations
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\subsubsection env_set_var Setting variables
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To set a variable `id` the value `value` the following syntax can be used.
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\code{.cpp}
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env[id] = value;
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env(id, value);
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\endcode
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`std::initializer_list` is among the allowed types, so the following syntax is also possible.
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\code{.cpp}
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env[id] = {value1, value2};
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env(id, {value1, value2});
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\endcode
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\note Creates the variable if it does not exist.
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The following lists contain possible value types, with `char_type` being either `char` or `wchar_t`
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for both `id` and `value`.
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\paragraph id id
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- `std::basic_string<char_type>`
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- `const char_type *`
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\paragraph env_set_var_value value
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- `std::basic_string<char_type>`
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- `const char_type * `
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- `std::initializer_list<const char_type *>`
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- `std::vector<std::basic_string<char_type>>`
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\note Using `std::vector` or `std::initializer_list`
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\subsubsection env_append_var Append variables
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Appending means, that a variable will be interpreted as a
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To append a variable `id` the value `value` the following syntax can be used:
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\code{.cpp}
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env[id] += value;
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\endcode
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`std::initializer_list` is among the allowed types, so the following syntax is also possible.
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\code{.cpp}
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env[id] += {value1, value2};
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\endcode
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\note Creates the variable if it does not exist.
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The following lists contain possible value types, with `char_type` being either `char` or `wchar_t`
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for both `id` and `value`.
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\paragraph env_append_var_id id
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- `std::basic_string<char_type>`
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- `const char_type *`
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\paragraph env_append_var_value value
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- `std::basic_string<char_type>`
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- `const char_type *`
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- `std::initializer_list<const char_type *>`
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- `std::vector<std::basic_string<char_type>>`
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\subsubsection env_reset Reset variables
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Reseting signle variables can be done in the following way:
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\code{.cpp}
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env[id] = boost::none;
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env(id, boost::none);
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\endcode
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\note This does not set the value empty, but removes it from the list.
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The following lists contain possible value types, with `char_type` being either `char` or `wchar_t`:
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\paragraph env_reset_var_id id
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- `std::basic_string<char_type>`
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- `const char_type *`
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\subsubsection env_init Initialize the environment
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The whole environment can be initialized from an object of type
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\xmlonly <classname>boost::process::environment</classname> \endxmlonly
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\code{.cpp}
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env=env;
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env(env);
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\endcode
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\note The passed `environment` can also be default-constructed to get an empty environment.
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\paragraph env_init_var_id id
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- `std::basic_string<char_type>`
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- `const char_type *`
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\paragraph env_init_var_value value
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- `boost::process::basic_environment<char_type>`
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\subsection env_example Example
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\code{.cpp}
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spawn("b2", env["PATH"]+="F:/boost", env["SOME_VAR"]=boost::none, env["NEW_VAR"]="VALUE");
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\endcode
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If the overload style should be done by passing an instance of
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\xmlonly <classname>boost::process::environment</classname> \endxmlonly
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the above example would look like this.
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\code{.cpp}
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environment e = this_process::environment();
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e["PATH"] += "F:/boost";
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e.erase("SOME_VAR");
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e["NEW_VAR"] = "VALUE";
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spawn("b2", e);
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\endcode
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\warning Passing an empty environment will cause undefined behaviour.
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*/
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constexpr boost::process::detail::env_ env{};
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}}
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#endif /* INCLUDE_BOOST_PROCESS_DETAIL_ENV_HPP_ */
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