138 lines
3.8 KiB
C++
138 lines
3.8 KiB
C++
#ifndef parameters_parser_hh_INCLUDED
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#define parameters_parser_hh_INCLUDED
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#include "string.hh"
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#include "memoryview.hh"
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#include "exception.hh"
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#include <unordered_map>
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namespace Kakoune
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{
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using ParameterList = memoryview<String>;
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struct unknown_option : public runtime_error
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{
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unknown_option(const String& name)
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: runtime_error("unknown option '" + name + "'") {}
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};
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struct missing_option_value: public runtime_error
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{
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missing_option_value(const String& name)
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: runtime_error("missing value for option '" + name + "'") {}
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};
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struct wrong_argument_count : runtime_error
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{
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wrong_argument_count() : runtime_error("wrong argument count") {}
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};
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using OptionMap = std::unordered_map<String, bool>;
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// ParameterParser provides tools to parse command parameters.
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// There are 3 types of parameters:
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// * unnamed options, which are accessed by position (ignoring named ones)
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// * named boolean options, which are enabled using '-name' syntax
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// * named string options, which are defined using '-name value' syntax
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struct ParametersParser
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{
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enum class Flags
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{
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None = 0,
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OptionsOnlyAtStart = 1,
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};
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friend constexpr Flags operator|(Flags lhs, Flags rhs)
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{
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return (Flags)((int) lhs | (int) rhs);
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}
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friend constexpr bool operator&(Flags lhs, Flags rhs)
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{
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return ((int) lhs & (int) rhs) != 0;
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}
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// the options defines named options, if they map to true, then
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// they are understood as string options, else they are understood as
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// boolean option.
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ParametersParser(const ParameterList& params,
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OptionMap options,
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Flags flags = Flags::None,
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size_t min_positionals = 0,
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size_t max_positionals = -1);
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// check if a named option (either string or boolean) is specified
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bool has_option(const String& name) const;
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// get a string option value, returns an empty string if the option
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// is not defined
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const String& option_value(const String& name) const;
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// positional parameters count
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size_t positional_count() const;
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struct iterator
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{
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public:
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typedef String value_type;
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typedef const value_type* pointer;
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typedef const value_type& reference;
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typedef size_t difference_type;
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typedef std::forward_iterator_tag iterator_category;
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iterator(const ParametersParser& parser, size_t index)
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: m_parser(parser), m_index(index) {}
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const String& operator*() const
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{
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return m_parser.m_params[m_parser.m_positional_indices[m_index]];
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}
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const String* operator->() const
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{
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return &m_parser.m_params[m_parser.m_positional_indices[m_index]];
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}
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iterator& operator++() { ++m_index; return *this; }
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bool operator==(const iterator& other) const
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{
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assert(&m_parser == &other.m_parser);
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return m_index == other.m_index;
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}
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bool operator!=(const iterator& other) const
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{
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assert(&m_parser == &other.m_parser);
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return m_index != other.m_index;
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}
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bool operator<(const iterator& other) const
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{
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assert(&m_parser == &other.m_parser);
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return m_index < other.m_index;
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}
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private:
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const ParametersParser& m_parser;
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size_t m_index;
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};
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// access positional parameter by index
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const String& operator[] (size_t index) const;
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// positional parameter begin
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iterator begin() const;
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// positional parameter end
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iterator end() const;
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private:
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ParameterList m_params;
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std::vector<size_t> m_positional_indices;
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std::unordered_map<String, bool> m_options;
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};
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}
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#endif // parameters_parser_hh_INCLUDED
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