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#ifndef parameters_parser_hh_INCLUDED
#define parameters_parser_hh_INCLUDED
#include "string.hh"
#include "memoryview.hh"
#include "exception.hh"
#include <unordered_map>
namespace Kakoune
{
using ParameterList = memoryview<String>;
struct unknown_option : public runtime_error
{
unknown_option(const String& name)
: runtime_error("unknown option '" + name + "'") {}
};
struct missing_option_value: public runtime_error
{
missing_option_value(const String& name)
: runtime_error("missing value for option '" + name + "'") {}
};
// ParameterParser provides tools to parse command parameters.
// There are 3 types of parameters:
// * unnamed options, which are accessed by position (ignoring named ones)
// * named boolean options, which are enabled using '-name' syntax
// * named string options, which are defined using '-name value' syntax
struct ParametersParser
{
// the options defines named options, if they map to true, then
// they are understood as string options, else they are understood as
// boolean option.
ParametersParser(const ParameterList& params,
std::unordered_map<String, bool> options);
// check if a named option (either string or boolean) is specified
bool has_option(const String& name) const;
// get a string option value, returns an empty string if the option
// is not defined
const String& option_value(const String& name) const;
// positional parameters count
size_t positional_count() const;
struct iterator
{
public:
typedef String value_type;
typedef const value_type* pointer;
typedef const value_type& reference;
typedef size_t difference_type;
typedef std::forward_iterator_tag iterator_category;
iterator(const ParametersParser& parser, size_t index)
: m_parser(parser), m_index(index) {}
const String& operator*() const
{
assert(m_parser.m_positional[m_index]);
return m_parser.m_params[m_index];
}
const String* operator->() const
{
assert(m_parser.m_positional[m_index]);
return &m_parser.m_params[m_index];
}
iterator& operator++()
{
while (m_index < m_parser.m_positional.size() and
not m_parser.m_positional[++m_index]) {}
return *this;
}
bool operator==(const iterator& other) const
{
return &m_parser == &other.m_parser and m_index == other.m_index;
}
bool operator!=(const iterator& other) const
{
return &m_parser != &other.m_parser or m_index != other.m_index;
}
bool operator<(const iterator& other) const
{
assert(&m_parser == &other.m_parser);
return m_index < other.m_index;
}
private:
const ParametersParser& m_parser;
size_t m_index;
};
// access positional parameter by index
const String& operator[] (size_t index) const;
// positional parameter begin
iterator begin() const;
// positional parameter end
iterator end() const;
private:
ParameterList m_params;
std::vector<bool> m_positional;
std::unordered_map<String, bool> m_options;
};
}
#endif // parameters_parser_hh_INCLUDED
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