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asyncinput.h
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98 lines (85 loc) · 3.17 KB
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/*******************************************************************************
* CLI - A simple command line interface.
* Copyright (C) 2016 Daniele Pallastrelli
*
* Boost Software License - Version 1.0 - August 17th, 2003
*
* Permission is hereby granted, free of charge, to any person or organization
* obtaining a copy of the software and accompanying documentation covered by
* this license (the "Software") to use, reproduce, display, distribute,
* execute, and transmit the Software, and to prepare derivative works of the
* Software, and to permit third-parties to whom the Software is furnished to
* do so, all subject to the following:
*
* The copyright notices in the Software and this entire statement, including
* the above license grant, this restriction and the following disclaimer,
* must be included in all copies of the Software, in whole or in part, and
* all derivative works of the Software, unless such copies or derivative
* works are solely in the form of machine-executable object code generated by
* a source language processor.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
* SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
* FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
******************************************************************************/
#ifndef ASYNCINPUT_H_
#define ASYNCINPUT_H_
#include <string>
#include <boost/asio.hpp>
#include "cli.h" // CliSession
namespace cli
{
class AsyncInput
{
public:
AsyncInput( boost::asio::io_service& ios, CliSession& _session ) :
session( _session ),
input( ios, ::dup( STDIN_FILENO ) )
{
session.Add( "exit", [this](std::ostream&){ session.Exit(); }, "Quit the application" );
Read();
}
~AsyncInput()
{
input.close();
}
private:
void Read()
{
session.Prompt();
// Read a line of input entered by the user.
boost::asio::async_read_until(
input,
inputBuffer,
'\n',
std::bind( &AsyncInput::NewLine, this,
std::placeholders::_1,
std::placeholders::_2 )
);
}
void NewLine( const boost::system::error_code& error, std::size_t length )
{
if ( !error || error == boost::asio::error::not_found )
{
auto bufs = inputBuffer.data();
std::size_t size = length;
if ( !error ) --size; // tolgo il \n
std::string s( boost::asio::buffers_begin( bufs ), boost::asio::buffers_begin( bufs ) + size );
inputBuffer.consume( length );
if ( session.Feed( s ) ) Read();
}
else
{
input.close();
}
}
CliSession& session;
boost::asio::streambuf inputBuffer;
boost::asio::posix::stream_descriptor input;
};
} // namespace
#endif // ASYNCINPUT_H_