cmdline.cpp

C++的一个好库。。。现在很流行

// Copyright Vladimir Prus 2002-2004.
// Distributed under the Boost Software License, Version 1.0.
// (See accompanying file LICENSE_1_0.txt
// or copy at http://www.boost.org/LICENSE_1_0.txt)

#define BOOST_PROGRAM_OPTIONS_SOURCE
#include <boost/program_options/config.hpp>

#include <boost/config.hpp>

#include <boost/program_options/detail/cmdline.hpp>
#include <boost/program_options/errors.hpp>
#include <boost/program_options/value_semantic.hpp>
#include <boost/program_options/options_description.hpp>
#include <boost/program_options/positional_options.hpp>
#include <boost/throw_exception.hpp>

#include <boost/bind.hpp>

#include <string>
#include <utility>
#include <vector>
#include <cassert>
#include <cstring>
#include <cctype>

#include <cstdio>

#include <iostream>

namespace boost { namespace program_options {

    using namespace std;
    using namespace boost::program_options::command_line_style;
    
    invalid_command_line_syntax::
    invalid_command_line_syntax(const std::string& tokens, kind_t kind)
    : invalid_syntax(tokens, error_message(kind)), m_kind(kind)
    {}

    std::string 
    invalid_command_line_syntax::error_message(kind_t kind)
    {
        // Initially, store the message in 'const char*' variable,
        // to avoid conversion to std::string in all cases.
        const char* msg;
        switch(kind)
        {
        case long_not_allowed:
            msg = "long options are not allowed";
            break;
        case long_adjacent_not_allowed:
            msg = "parameters adjacent to long options not allowed";
            break;
        case short_adjacent_not_allowed:
            msg = "parameters adjust to short options are not allowed";
            break;
        case empty_adjacent_parameter:
            msg = "adjacent parameter is empty";
            break;
        case missing_parameter:
            msg = "required parameter is missing";
            break;
        case extra_parameter:
            msg = "extra parameter";
            break;
        default:
            msg = "unknown error";
        }
        return msg;
    }

    invalid_command_line_syntax::kind_t 
    invalid_command_line_syntax::kind() const
    {
        return m_kind;
    }


}}


namespace boost { namespace program_options { namespace detail {

    // vc6 needs this, but borland chokes when this is added.
#if BOOST_WORKAROUND(_MSC_VER, < 1300)
    using namespace std;
    using namespace program_options;
#endif


    cmdline::cmdline(const std::vector<std::string>& args)
    {
        init(args);
    }

    cmdline::cmdline(int argc, const char*const * argv)
    {
#if defined(BOOST_NO_TEMPLATED_ITERATOR_CONSTRUCTORS)
        vector<string> args;
        copy(argv+1, argv+argc, inserter(args, args.end()));
        init(args);
#else
        init(vector<string>(argv+1, argv+argc));
#endif
    }

    void
    cmdline::init(const std::vector<std::string>& args)
    {
        this->args = args;        
        m_style = command_line_style::default_style;
        m_desc = 0;
        m_positional = 0;
        m_allow_unregistered = false;
    }

    void 
    cmdline::style(int style)
    {
        if (style == 0) 
            style = default_style;        

        check_style(style);
        this->m_style = style_t(style);
    }
    
    void 
    cmdline::allow_unregistered()
    {
        this->m_allow_unregistered = true;
    }

    void 
    cmdline::check_style(int style) const
    {
        bool allow_some_long = 
            (style & allow_long) || (style & allow_long_disguise);

        const char* error = 0;
        if (allow_some_long && 
            !(style & long_allow_adjacent) && !(style & long_allow_next))
            error = "style disallows parameters for long options";

        if (!error && (style & allow_short) &&
            !(style & short_allow_adjacent) && !(style & short_allow_next))
            error = "style disallows parameters for short options";

        if (!error && (style & allow_short) &&
            !(style & allow_dash_for_short) && !(style & allow_slash_for_short))
            error = "style disallows all characters for short options";

        if (error)
            throw invalid_command_line_style(error);

        // Need to check that if guessing and long disguise are enabled
        // -f will mean the same as -foo
    }

    void 
    cmdline::set_options_description(const options_description& desc)
    {
        m_desc = &desc;
    }

    void 
    cmdline::set_positional_options(
        const positional_options_description& positional)
    {
        m_positional = &positional;
    }


    vector<option>
    cmdline::run()
    {
        // The parsing is done by having a set of 'style parsers'
        // and trying then in order. Each parser is passed a vector
        // of unparsed tokens and can consume some of them (by
        // removing elements on front) and return a vector of options.
        //
        // We try each style parser in turn, untill some input
        // is consumed. The returned vector of option may contain the
        // result of just syntactic parsing of token, say --foo will
        // be parsed as option with name 'foo', and the style parser
        // is not required to care if that option is defined, and how
        // many tokens the value may take.
        // So, after vector is returned, we validate them.
        assert(m_desc);

        vector<style_parser> style_parsers;      

        if (m_style_parser)
            style_parsers.push_back(m_style_parser);

        if (m_additional_parser)
            style_parsers.push_back(
                bind(&cmdline::handle_additional_parser, this, _1));

        if (m_style & allow_long)
            style_parsers.push_back(
                bind(&cmdline::parse_long_option, this, _1));

        if ((m_style & allow_long_disguise))
            style_parsers.push_back(
                bind(&cmdline::parse_disguised_long_option, this, _1));

        if ((m_style & allow_short) && (m_style & allow_dash_for_short))
            style_parsers.push_back(
                bind(&cmdline::parse_short_option, this, _1));

        if ((m_style & allow_short) && (m_style & allow_slash_for_short))
            style_parsers.push_back(bind(&cmdline::parse_dos_option, this, _1));

        style_parsers.push_back(bind(&cmdline::parse_terminator, this, _1));

        vector<option> result;
        while(!args.empty())
        {
            bool ok = false;
            for(unsigned i = 0; i < style_parsers.size(); ++i)
            {
                unsigned current_size = args.size();
                vector<option> next = style_parsers[i](args);

                // Check that option names
                // are valid, and that all values are in place.
                if (!next.empty())
                {
                    vector<string> e;
                    for(unsigned k = 0; k < next.size()-1; ++k) {
                        finish_option(next[k], e);
                    }
                    // For the last option, pass the unparsed tokens
                    // so that they can be added to next.back()'s values
                    // if appropriate.
                    finish_option(next.back(), args);
                    for (unsigned j = 0; j < next.size(); ++j)
                        result.push_back(next[j]);                    
                }
                                
                if (args.size() != current_size) {
                    ok = true;
                    break;                
                } 
            }
            
            if (!ok) {
                option opt;
                opt.value.push_back(args[0]);
                opt.original_tokens.push_back(args[0]);
                result.push_back(opt);
                args.erase(args.begin());
            }
        }

        // Assign position keys to positional options.
        int position_key = 0;
        for(unsigned i = 0; i < result.size(); ++i) {
            if (result[i].string_key.empty())
                result[i].position_key = position_key++;
        }