libcruft-util/cmdopt.cpp

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