469 lines
11 KiB
C++
469 lines
11 KiB
C++
/*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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* Copyright 2013 Danny Robson <danny@nerdcruft.net>
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*/
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#include "cmdopt.hpp"
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#include "debug.hpp"
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#include <algorithm>
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#include <cstring>
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#include <iomanip>
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using util::cmdopt::option::base;
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using util::cmdopt::option::bytes;
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using util::cmdopt::option::count;
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using util::cmdopt::option::null;
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using util::cmdopt::option::present;
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using util::cmdopt::option::value;
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using util::cmdopt::parser;
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///////////////////////////////////////////////////////////////////////////////
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base::base (std::string _name, std::string _description):
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m_required (false),
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m_seen (false),
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m_name (std::move (_name)),
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m_description (std::move (_description))
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{ ; }
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//-----------------------------------------------------------------------------
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base::~base ()
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{ ; }
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//-----------------------------------------------------------------------------
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void
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base::execute (void)
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{
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throw invalid_null (m_name);
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}
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//-----------------------------------------------------------------------------
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void
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base::execute (const char *restrict)
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{
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throw invalid_value (m_name);
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}
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//-----------------------------------------------------------------------------
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void
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base::start (void)
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{
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m_seen = false;
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}
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//-----------------------------------------------------------------------------
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void
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base::finish (void)
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{
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if (m_required && !m_seen)
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throw invalid_required (m_name);
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}
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//-----------------------------------------------------------------------------
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const std::string&
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base::name (void) const
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{
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return m_name;
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}
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//-----------------------------------------------------------------------------
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const std::string&
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base::description (void) const
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{
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return m_description;
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}
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//-----------------------------------------------------------------------------
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bool
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base::required (void) const
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{
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return m_required;
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}
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//-----------------------------------------------------------------------------
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bool
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base::required (bool _required)
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{
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return m_required = _required;
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}
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//-----------------------------------------------------------------------------
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bool
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base::seen (void) const
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{
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return m_seen;
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}
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//-----------------------------------------------------------------------------
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bool
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base::seen (bool _seen)
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{
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return m_seen = _seen;
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}
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///////////////////////////////////////////////////////////////////////////////
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null::null (std::string _name, std::string _description):
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base (std::move (_name), std::move (_description))
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{ ; }
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//-----------------------------------------------------------------------------
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void
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null::execute (void)
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{
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seen (true);
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}
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//-----------------------------------------------------------------------------
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void
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null::execute (const char *restrict)
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{
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seen (true);
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}
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///////////////////////////////////////////////////////////////////////////////
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present::present (std::string _name, std::string _description, bool &_data):
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base (std::move (_name), std::move (_description)),
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m_data (_data)
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{ ; }
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//-----------------------------------------------------------------------------
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void
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present::execute (void)
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{
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seen (true);
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}
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//-----------------------------------------------------------------------------
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void
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present::finish (void)
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{
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m_data = seen ();
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base::finish ();
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}
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///////////////////////////////////////////////////////////////////////////////
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namespace util { namespace cmdopt { namespace option {
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template <>
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void
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value<bool>::execute (const char *restrict str)
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{
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static const std::string TRUE_STRING[] = {
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"true",
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"yes",
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"y",
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"1"
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};
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if (std::any_of (std::begin (TRUE_STRING),
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std::end (TRUE_STRING),
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[str] (auto i) { return i == str; }))
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{
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m_data = true;
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return;
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}
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static const std::string FALSE_STRING[] = {
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"false",
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"no",
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"n",
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"0"
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};
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if (std::any_of (std::begin (FALSE_STRING),
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std::end (FALSE_STRING),
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[str] (auto i) { return i == str; }))
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{
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m_data = false;
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return;
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}
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base::execute (str);
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seen (true);
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}
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} } }
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//-----------------------------------------------------------------------------
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namespace util { namespace cmdopt { namespace option {
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template class value<uint16_t>;
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template class value<uint32_t>;
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template class value<uint64_t>;
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} } }
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///////////////////////////////////////////////////////////////////////////////
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template <typename T>
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count<T>::count (std::string _name, std::string _description, T &_data):
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value<T> (std::move (_name), std::move (_description), _data)
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{ ; }
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//-------------------------------------------------------------------------
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template <typename T>
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void
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count<T>::execute (void)
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{
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++this->data ();
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this->seen (true);
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}
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//-----------------------------------------------------------------------------
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namespace util { namespace cmdopt { namespace option {
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template class count<unsigned>;
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} } }
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///////////////////////////////////////////////////////////////////////////////
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static size_t
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suffix_to_multiplier (char c)
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{
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switch (c) {
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case 'e':
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case 'E':
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return pow (1024UL, 6);
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case 'p':
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case 'P':
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return pow (1024UL, 5);
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case 't':
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case 'T':
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return pow (1024UL, 4);
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case 'g':
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case 'G':
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return pow (1024UL, 3);
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case 'm':
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case 'M':
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return pow (1024UL, 2);
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case 'k':
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case 'K':
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return pow (1024UL, 1);
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default:
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throw util::cmdopt::invalid_value ("bytes");
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}
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}
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//-----------------------------------------------------------------------------
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void
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bytes::execute (const char *restrict str)
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{
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const char *tail;
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const char *last = str + strlen (str);
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unsigned long val = std::strtoul (const_cast<char *> (str), const_cast<char**> (&tail), 10);
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CHECK_LE (tail, last);
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if (tail == str) {
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throw invalid_value (name ());
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} else if (tail == last) {
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data (val);
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} else if (tail + 1 == last) {
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data (val * suffix_to_multiplier (*tail));
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} else
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throw invalid_value (name ());
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}
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///////////////////////////////////////////////////////////////////////////////
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int
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parser::scan (int argc, const char *const *argv)
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{
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CHECK_GE (argc, 0);
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CHECK (argv);
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for (auto &j: m_options)
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std::get<2> (j)->start ();
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// start iterating after our program's name
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int i = 1;
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while (i < argc) {
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auto len = strlen (argv[i]);
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// bail if there's no potential for an option
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if (len < 2 || argv[i][0] != '-')
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return i;
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// parse longopt
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auto inc = argv[i][1] == '-'
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? parse_long (i, argc, argv)
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: parse_short (i, argc, argv);
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CHECK_GT (inc, 0);
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i += inc;
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}
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for (auto &j: m_options)
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std::get<2> (j)->finish ();
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return i;
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}
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//-----------------------------------------------------------------------------
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int
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parser::parse_long (int pos, int argc, const char *const *argv)
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{
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CHECK_LT (pos, argc);
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CHECK_GE (pos, 0);
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CHECK_GE (argc, 0);
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CHECK (argv);
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CHECK_EQ (argv[pos][0], '-');
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CHECK_EQ (argv[pos][1], '-');
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// break first atom into components and extract the key
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const char *start = argv[pos] + 2;
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const char *eq = strchr (start, '=');
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const char *last = start + strlen (start);
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std::string key { start, eq ? eq : last };
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if (key == "help")
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print_help (argc, argv);
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// find the handler
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auto handle_pos = std::find_if (m_long.begin (),
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m_long.end (),
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[&] (auto i) { return std::get<0> (i) == key; });
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if (handle_pos == m_long.end ())
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throw invalid_key (key);
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auto &handler = std::get<1> (*handle_pos);
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// maybe grab a value from the next atom and dispatch
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if (!eq) {
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// check the next atom for the value
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if (pos + 1 < argc)
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if (argv[pos + 1][0] != '-') {
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handler.execute (argv[pos+1]);
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return 2;
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}
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handler.execute ();
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} else {
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handler.execute (eq+1);
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}
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return 1;
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}
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//-----------------------------------------------------------------------------
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int
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parser::parse_short (int pos, int argc, const char *const *argv)
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{
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CHECK_LT (pos, argc);
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CHECK_GE (pos, 0);
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CHECK_GE (argc, 0);
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CHECK (argv);
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CHECK_EQ (argv[pos][0], '-');
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CHECK_NEQ (argv[pos][1], '-');
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// we have a run of no-value keys
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auto len = strlen (argv[pos]);
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if (len > 2 || pos + 1 == argc || argv[pos+1][0] == '-') {
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for (size_t i = 1; i < len; ++i) {
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auto letter = argv[pos][i];
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if (letter == 'h')
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print_help (argc, argv);
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auto hpos = std::find_if (m_short.begin (),
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m_short.end (),
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[letter] (auto j) { return std::get<0> (j) == letter; });
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if (hpos == m_short.end ())
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throw invalid_key (std::to_string (letter));
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std::get<1> (*hpos).execute ();
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}
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return 1;
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}
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// we have a value following
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auto letter = argv[pos][1];
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auto hpos = std::find_if (m_short.begin (),
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m_short.end (),
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[letter] (auto i) { return std::get<0> (i) == letter; });
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if (hpos == m_short.end ())
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throw invalid_key (std::to_string (letter));
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std::get<1> (*hpos).execute (argv[pos+1]);
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return 2;
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}
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///////////////////////////////////////////////////////////////////////////////
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void
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parser::print_help (const int argc,
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const char *const *argv) const
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{
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(void)argc;
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CHECK_EQ (m_short.size (), m_options.size ());
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CHECK_EQ (m_long.size (), m_options.size ());
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if (m_options.empty ())
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exit (0);
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// find the longest long form argument so we can set field alignment
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auto largest = std::max_element (m_long.begin (),
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m_long.end (),
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[] (const auto &a, const auto &b) {
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return std::get<0> (a).size () < std::get<0> (b).size ();
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});
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int longwidth = std::get<0> (*largest).size ();
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// field width requires an alignment. we don't care about preserving
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// state as we're about to bail anyway
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std::cout << std::left;
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// print all the option info
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std::cout << "usage: " << argv[0] << '\n';
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for (auto &o: m_options) {
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std::cout << '\t'
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<< '-' << std::get<0> (o) << '\t'
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<< std::setw (longwidth) << std::get<1> (o) << '\t'
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<< std::setw (0) << std::get<2> (o)->description ()
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<< '\n';
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}
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exit (0);
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}
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