133 lines
4.6 KiB
C++
133 lines
4.6 KiB
C++
/*
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* This file is a part of PikoTools
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* and is distributed under the (new) BSD licence.
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* Author: Tomasz Sowa <t.sowa@ttmath.org>
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*/
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/*
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* Copyright (c) 2011-2012, Tomasz Sowa
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* * Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* * Neither the name Tomasz Sowa nor the names of contributors to this
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* project may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
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* THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef headerfile_picotools_mainparser_mainparser
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#define headerfile_picotools_mainparser_mainparser
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namespace PT
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{
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/*
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a very little parser for main(int argc, char ** argv) parameters
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look in sample/sample.cpp how to use the parser
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*/
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class MainParser
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{
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public:
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MainParser();
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MainParser(int argc, const char ** argv);
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// setting arguments passed to main(int argc, char ** argv) function
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void Set(int argc, const char ** argv);
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// reseting the current state of parsing
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// now you can start parsing from the beginning
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// you don't have to call it for the first time
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// (is automatically called by the Set method)
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void Reset();
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// checking if there is a next single or double parameter
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// this method represents the main loop of checking parameters
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bool NextParam();
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// returning a single parameter (if exists) or '\0' otherwise
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// single parameter means a parameter with '-' at the beginning e.g. "-a"
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// next call to this method (without calling NextParam) returns the same value
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// this method should be called after NextParam()
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char GetSingleParam();
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// calling GetSingleParam() and comparign with 'c'
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bool IsSingleParam(char c);
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// returning a string for a double parameter or an empty string if there is no such a parameter
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// double parameter means a parameter with '--' at the beginning e.g. "--output"
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// next call to this method (without calling NextParam) returns the same value
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// GetDoubleParam() should be called after NextParam()
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// this method never returns a null pointer -- if there is no a param name (end of the string)
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// a pointer to en empty string will be returned
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const char * GetDoubleParam();
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// calling GetDoubleParam() and comparing with 'param'
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// so you don't have to call strcmp directly
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bool IsDoubleParam(const char * param);
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// returning a string representing a value
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// you have to know which parameter requires a value
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// and if such a parameter is found then use this method to obtain the value
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// the method advances the current pointer so next call to this method return a next value
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// you can call GetValue() even when NextParam() has returned false
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// in such a case this gets you the last values (those at the end of the parameter list)
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// this method never returns a null pointer -- if there is no a value (end of the string)
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// a pointer to en empty string will be returned
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const char * GetValue();
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// returning true if the input string is finished
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// there are no more parameters or values
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bool IsEnd();
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// returning true if there is a single parameter
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// should be called after NextParam()
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bool HasSingleParam();
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// returning true if there is a double parameter
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// should be called after NextParam()
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bool HasDoubleParam();
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private:
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bool Advance();
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int argindex;
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int offset;
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int argsize;
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const char ** arg;
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char empty;
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bool has_single_param;
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bool has_double_param;
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char last_single_param;
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const char * last_double_param;
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};
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} // namespace
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#endif
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