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cppargs
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* initial commit

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bergmann 7 years ago
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  1. +2
    -0
      .gitignore
  2. +3
    -0
      .gitmodules
  3. +15
    -0
      CMakeLists.txt
  4. +21
    -0
      LICENSE.txt
  5. +1
    -0
      cmake/modules
  6. +6
    -0
      include/cppargs.h
  7. +161
    -0
      include/cppargs/option.h
  8. +33
    -0
      include/cppargs/option.inl
  9. +96
    -0
      include/cppargs/parser.h
  10. +24
    -0
      src/CMakeLists.txt
  11. +35
    -0
      test/CMakeLists.txt
  12. +22
    -0
      test/cppargs.cpp

+ 2
- 0
.gitignore View File

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build/
.vscode/

+ 3
- 0
.gitmodules View File

@@ -0,0 +1,3 @@
[submodule "cmake/modules"]
path = cmake/modules
url = b3rgmann@git.bergmann89.de:cpp/CmakeModules.git

+ 15
- 0
CMakeLists.txt View File

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# Initialize CMake ################################################################################

CMake_Minimum_Required ( VERSION 3.5.1 FATAL_ERROR )
Include ( CTest )
If ( NOT CMAKE_BUILD_TYPE )
Set ( CMAKE_BUILD_TYPE "Release" CACHE STRING "Choose the type of build!" FORCE )
EndIf ( NOT CMAKE_BUILD_TYPE )
Set ( CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH}
"${CMAKE_CURRENT_SOURCE_DIR}/cmake/"
"${CMAKE_CURRENT_SOURCE_DIR}/cmake/modules" )

# Projects ########################################################################################

Add_SubDirectory ( ${CMAKE_CURRENT_SOURCE_DIR}/src )
Add_SubDirectory ( ${CMAKE_CURRENT_SOURCE_DIR}/test )

+ 21
- 0
LICENSE.txt View File

@@ -0,0 +1,21 @@
MIT License

Copyright (c) 2018 Erik Junghanns (aka Bergmann89)

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

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 AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

+ 1
- 0
cmake/modules

@@ -0,0 +1 @@
Subproject commit 1e74005bc2f91434fecb2e5f698c21b73f7e3a13

+ 6
- 0
include/cppargs.h View File

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#pragma once

#include "cppargs/option.h"
#include "cppargs/parser.h"

#include "cppargs/option.inl"

+ 161
- 0
include/cppargs/option.h View File

@@ -0,0 +1,161 @@
#pragma once

#include <string>

namespace cppargs
{

enum class next_result
{
finished = 0, //!< context does not have any further arguments
option_short = 1, //!< moving to next argument was successfull (argument starts with - or --)
option_long = 2, //!< moving to next argument was successfull (argument starts with - or --)
argument = 3, //!< moving to next argument was successfull (argument does not starts with - or --)
};

struct context
{
int const argc;
char const * const * const argv;
char const * const exe;
char const * arg { nullptr };
char const * value { nullptr };
int index { 0 };

inline next_result next(std::string* key = nullptr)
{
if (key)
key->clear();

if (index + 1 >= argc)
return next_result::finished;

++index;
arg = argv[index];
value = nullptr;

/* check argument */
int i = 0;
value = nullptr;
while (arg[i] == '-')
++i;

/* parse value */
if (i == 1)
{
if (key)
*key = std::string("-") + arg[1];
if (arg[2] != '\0')
value = &arg[2];
return next_result::option_short;
}
else if (i == 2)
{
auto tmp = strchr(arg, '=');
if (tmp)
{
value = tmp + 1;
if (key)
*key = std::string(arg, static_cast<size_t>(tmp - arg - 1));
}
else if (key)
{
*key = arg;
}
return next_result::option_long;
}
else
{
return next_result::argument;
}
}
};

struct option
{
public:
const std::string long_name;
const char short_name;

public:
inline option(
const std::string& p_long_name,
const char p_short_name);

virtual ~option() = default;

virtual void parse(context& c) = 0;
};

template<typename T_predicate>
struct predicate_option
: public option
{
public:
using predicate_type = T_predicate;

private:
predicate_type _predicate;

public:
template<typename... T_args>
inline predicate_option(
const std::string& p_long_name,
const char p_short_name,
T_args&&... args);

virtual void parse(context& c) override;
};

template<typename T_value>
struct reference_option
: public option
{
public:
using value_type = T_value;

private:
value_type& _value;

public:
inline reference_option(
const std::string& p_long_name,
const char p_short_name,
value_type& p_value)
: option(p_long_name, p_short_name)
, _value(p_value)
{ }

virtual void parse(context& c) override
{
auto old = c;
auto value = c.value;
if (!value)
{
auto ret = c.next();
if (ret != next_result::argument)
throw std::runtime_error(std::string("option ") + old.arg + " expected one argument");
value = c.arg;
}

std::cout << value << std::endl;
}
};

template<typename T_predicate>
constexpr decltype(auto) make_predicate_option(const std::string& long_name, char short_name, T_predicate&& predicate)
{
using predicate_type = T_predicate;
using predicate_option_type = predicate_option<predicate_type>;
return std::make_unique<predicate_option_type>(long_name, short_name, std::forward<predicate_type>(predicate));
}

template<typename T_value>
constexpr decltype(auto) make_reference_option(const std::string& long_name, char short_name, T_value& value)
{
using value_type = T_value;
using reference_option_type = reference_option<value_type>;
return std::make_unique<reference_option_type>(long_name, short_name, value);
}

}

+ 33
- 0
include/cppargs/option.inl View File

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#pragma once

#include "option.h"

namespace cppargs
{

/* option */

option::option(
const std::string& p_long_name,
const char p_short_name)
: long_name (p_long_name)
, short_name(p_short_name)
{ }

/* predicate_option */

template<typename T_predicate>
template<typename... T_args>
predicate_option<T_predicate>::predicate_option(
const std::string& p_long_name,
const char p_short_name,
T_args&&... args)
: option(p_long_name, p_short_name)
, _predicate(std::forward<T_args>(args)...)
{ }

template<typename T_predicate>
void predicate_option<T_predicate>::parse(context& c)
{ _predicate(c); }

}

+ 96
- 0
include/cppargs/parser.h View File

@@ -0,0 +1,96 @@
#pragma once

#include <map>
#include <vector>
#include <memory>
#include <cstring>

#include "option.h"

namespace cppargs
{

struct parser
{
private:
using option_ptr_type = std::unique_ptr<option>;
using option_vector_type = std::vector<option_ptr_type>;
using option_map_type = std::map<std::string, option*>;

private:
option_ptr_type _default;
option_vector_type _options;
option_map_type _map;

inline void update_map()
{
_map.clear();
for (auto& o : _options)
{
if (!o)
throw std::runtime_error("expectd option to not be null!");
if (o->short_name)
_map.emplace(std::string("-") + o->short_name, o.get());
if (!o->long_name.empty())
_map.emplace(std::string("--") + o->long_name, o.get());
}
}

inline void handle_invalid_arg(context& c) const
{
if (_default)
{
_default->parse(c);
}
else
{
throw std::runtime_error(std::string("invalid or unknown argument: ") + c.arg);
}
}

public:
template<typename... T_option>
inline parser(option_ptr_type&& default_option, T_option&&... option)
: _default(std::move(default_option))
{
(void) (int[]) { 0, (_options.emplace_back(std::forward<T_option>(option)), 0)... };
update_map();
}

void parse(int argc, char const * argv[]) const
{
if (argc <= 0) {
return;
}

context c
{
argc,
argv,
argv[0],
};

next_result ret;
std::string key;
while ((ret = c.next(&key)) != next_result::finished)
{
/* move to next option */
if ( ret != next_result::option_short
&& ret != next_result::option_long)
handle_invalid_arg(c);

/* find option */
auto it = _map.find(key);
if (it == _map.end())
{
handle_invalid_arg(c);
}
else
{
it->second->parse(c);
}
}
}
};

}

+ 24
- 0
src/CMakeLists.txt View File

@@ -0,0 +1,24 @@
# Initialize ######################################################################################

Include ( cotire OPTIONAL RESULT_VARIABLE HAS_COTIRE )
Include ( pedantic OPTIONAL RESULT_VARIABLE HAS_PEDANTIC )
Include ( strip_symbols OPTIONAL RESULT_VARIABLE HAS_STRIP_SYMBOLS )

Set ( CMAKE_CXX_STANDARD 17 )

# Project: cppargs ################################################################################

Project ( cppargs VERSION 1.0.0.0 LANGUAGES CXX )
Set ( CPPARGS_INCLUDE_DIR ${CMAKE_CURRENT_SOURCE_DIR}/../include )
Add_Library ( cppargs INTERFACE )
Target_Include_Directories ( cppargs
INTERFACE ${CPPARGS_INCLUDE_DIR} )

If ( HAS_PEDANTIC )
Pedantic_Apply_Flags ( ALL )
EndIf ( )

# Optimize
If ( __COTIRE_INCLUDED )
Cotire ( cppargs )
EndIf ( )

+ 35
- 0
test/CMakeLists.txt View File

@@ -0,0 +1,35 @@
# Initialize ######################################################################################

Include ( cotire OPTIONAL RESULT_VARIABLE HAS_COTIRE )
Include ( pedantic OPTIONAL RESULT_VARIABLE HAS_PEDANTIC )
Include ( strip_symbols OPTIONAL RESULT_VARIABLE HAS_STRIP_SYMBOLS )
Include ( cmake_tests OPTIONAL RESULT_VARIABLE HAS_CMAKE_TESTS )

Set ( CMAKE_CXX_STANDARD 17 )

# Project: cppargs-test ###########################################################################

Find_Package ( GTest REQUIRED )

Project ( cppargs-test )
File ( GLOB_RECURSE SOURCE_FILES ${CMAKE_CURRENT_SOURCE_DIR}/*.cpp )
Add_Executable ( cppargs-test EXCLUDE_FROM_ALL ${SOURCE_FILES} )
Target_Link_Libraries ( cppargs-test
cppargs
GTest::Main )

If ( HAS_PEDANTIC )
Pedantic_Apply_Flags ( ALL )
EndIf ( )

# optimization
If ( HAS_COTIRE )
Cotire ( cppargs-test )
EndIf ( )

# test
If ( HAS_CMAKE_TESTS )
Add_CMake_Test ( NAME cppargs TARGET cppargs-test )
Else ( )
Add_Test ( NAME cppargs COMMAND cppargs-test )
EndIf ( )

+ 22
- 0
test/cppargs.cpp View File

@@ -0,0 +1,22 @@
#include <gtest/gtest.h>

#include <cppargs.h>

TEST(cppargs, simple)
{
int x;
cppargs::parser p(
nullptr,
cppargs::make_reference_option("index", 'i', x),
cppargs::make_predicate_option("test", 't', [](auto& c){
std::cout << c.arg << std::endl;
})
);

std::vector<const char*> args({
"/fuu/bar/exe",
"-i", "6",
"--test"
});
p.parse(static_cast<int>(args.size()), args.data());
}

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