commandlineoption.h

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/*==========================================================================
Copyright (c) 2006, Bill Rubin <[e-mail]>
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    * Neither the name of Quality Object Software, Inc., nor the names of 
      its contributors may be used to endorse or promote products derived 
      from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
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#pragma once
#include "../../../KeePassLibCpp/SysDefEx.h"
#include <cassert>
#include <string>

typedef std::basic_string<TCHAR> std_string;

/*
The CommandLineOption class encapsulates the semantics of a command line option.
A command line option is assumed to comprise a prefix followed by a 
case-insensitive option name, possibly followed by an option value.

A convenience member function isOption() determines whether a given command line
argument is in the form of an option.  If so, the optionValue() member function
returns the value.
*/

// CommandLineOption objects are immutable.

class CPP_CLASS_SHARE CommandLineOption {
public:
    explicit CommandLineOption(const std_string& optionName);  // Precondition:  optionName is lower case or punctuation
    const std_string& optionName() const {return m_optionName;}
    bool isOption(const std_string& argument) const;
    std_string optionValue(const std_string& argument) const {return argument.substr(optionValueOffset());}

    std_string::size_type optionValueOffset() const {return m_optionName.length() + 1;}

    static bool beginsWithPrefix(const std_string& argument);

private:
    const std_string m_optionName;
};