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/* Distributed under the OSI-approved BSD 3-Clause License. See accompanying
file Copyright.txt or https://cmake.org/licensing for details. */
#ifndef cmArgumentParser_h
#define cmArgumentParser_h
#include "cmConfigure.h" // IWYU pragma: keep
#include "cm_static_string_view.hxx"
#include <cm/string_view>
#include <cassert>
#include <functional>
#include <string>
#include <utility>
#include <vector>
namespace ArgumentParser {
using StringList = std::vector<std::string>;
using MultiStringList = std::vector<StringList>;
class Instance;
using Action = std::function<void(Instance&, void*)>;
// using ActionMap = cm::flat_map<cm::string_view, Action>;
class ActionMap : public std::vector<std::pair<cm::string_view, Action>>
{
public:
std::pair<iterator, bool> Emplace(cm::string_view name, Action action);
const_iterator Find(cm::string_view name) const;
};
class Instance
{
public:
Instance(ActionMap const& bindings)
: Bindings(bindings)
{
}
void Bind(bool& val);
void Bind(std::string& val);
void Bind(StringList& val);
void Bind(MultiStringList& val);
void Consume(cm::string_view arg, void* result,
std::vector<std::string>* unparsedArguments,
std::vector<std::string>* keywordsMissingValue);
private:
ActionMap const& Bindings;
std::string* CurrentString = nullptr;
StringList* CurrentList = nullptr;
bool ExpectValue = false;
};
} // namespace ArgumentParser
template <typename Result>
class cmArgumentParser
{
public:
// I *think* this function could be made `constexpr` when the code is
// compiled as C++20. This would allow building a parser at compile time.
template <typename T>
cmArgumentParser& Bind(cm::static_string_view name, T Result::*member)
{
bool const inserted =
this->Bindings
.Emplace(name,
[member](ArgumentParser::Instance& instance, void* result) {
instance.Bind(static_cast<Result*>(result)->*member);
})
.second;
assert(inserted), (void)inserted;
return *this;
}
template <typename Range>
void Parse(Result& result, Range const& args,
std::vector<std::string>* unparsedArguments = nullptr,
std::vector<std::string>* keywordsMissingValue = nullptr) const
{
ArgumentParser::Instance instance(this->Bindings);
for (cm::string_view arg : args) {
instance.Consume(arg, &result, unparsedArguments, keywordsMissingValue);
}
}
template <typename Range>
Result Parse(Range const& args,
std::vector<std::string>* unparsedArguments = nullptr,
std::vector<std::string>* keywordsMissingValue = nullptr) const
{
Result result;
this->Parse(result, args, unparsedArguments, keywordsMissingValue);
return result;
}
private:
ArgumentParser::ActionMap Bindings;
};
template <>
class cmArgumentParser<void>
{
public:
template <typename T>
cmArgumentParser& Bind(cm::static_string_view name, T& ref)
{
bool const inserted = this->Bind(cm::string_view(name), ref);
assert(inserted), (void)inserted;
return *this;
}
template <typename Range>
void Parse(Range const& args,
std::vector<std::string>* unparsedArguments = nullptr,
std::vector<std::string>* keywordsMissingValue = nullptr) const
{
ArgumentParser::Instance instance(this->Bindings);
for (cm::string_view arg : args) {
instance.Consume(arg, nullptr, unparsedArguments, keywordsMissingValue);
}
}
protected:
template <typename T>
bool Bind(cm::string_view name, T& ref)
{
return this->Bindings
.Emplace(name,
[&ref](ArgumentParser::Instance& instance, void*) {
instance.Bind(ref);
})
.second;
}
private:
ArgumentParser::ActionMap Bindings;
};
#endif
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