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// This may look like C, but it's really -*- C++ -*-
// $Id$
// ========================================================================
//
// = LIBRARY
// ace
//
// = FILENAME
// Arg_Shifter.h
//
// = AUTHOR
// Seth Widoff
//
// ========================================================================
#ifndef ACE_ARG_SHIFTER_H
#define ACE_ARG_SHIFTER_H
#include "ace/OS.h"
class ACE_Export ACE_Arg_Shifter
{
// = TITLE
// This ADT shifts known args to the back of the argv vector, so
// deeper levels of argument parsing can locate the yet
// unprocessed arguments at the beginning of the vector.
//
// = DESCRIPTION
// The <ACE_Arg_Shifter> copies the pointers of the argv vector
// into a temporary array. As the <ACE_Arg_Shifter> iterates over
// the temp, is places known arguments in the rear of the argv
// and unknown ones in the beginning. So, after having visited
// all the arguments in the temp vector, <ACE_Arg_Shifter> has
// placed all the unknown arguments in their original order at
// the front of argv.
public:
// = Initialization and termination methods.
ACE_Arg_Shifter (int& argc,
char** argv,
char** temp = 0);
// Initialize the <ACE_Arg_Shifter> to the vector over which to
// iterate, also providing the temporary array if the client doesn't
// want the arg_shifter to dynamically allocate its own. If internal
// dynamic allocation fails, the <ACE_Arg_Shifter> will set all the
// indices to the end of the vector, forbidding iteration. Following
// iteration over argv, the argc value will contain the number of
// unconsumed arguments.
~ACE_Arg_Shifter (void);
// Destructor.
char* get_current (void) const;
// Get the current head of the vector.
char* get_current_parameter (int offset = 0);
// After checking for a flag, use this method return the parameter
// Safe to call without checking for current argument
//
// If offset > 0, returns current argument + offset
// if (offset == 2) ... "value" returns pointer to "lue"
// if (offset == 7) ... "value" returns 0
//
// If offset == 0
// consumes current argument
// if (is_parameter_next ()) is true
// then returns a pointer to the new current argument
// else returns 0
//
// If offset < 0, returns current argument with offset
// but offset counts from the back
// if (offset == -2) ... "value" returns pointer to "ue"
// if (offset == -9) ... "value" returns 0
int cur_arg_strncasecmp (const char* flag);
// Check if the current argument matches (case insensitive) <flag>
//
// ------------------------------------------------------------
//
// Case A: Perfect Match (case insensitive)
// 0 is returned.
//
// ie: when current_arg = "-foobar" or "-FOOBAR" or "-fooBAR"
// this->cur_arg_strncasecmp ("-FooBar);
// will return 0
//
// ------------------------------------------------------------
//
// Case B: Perfect Match (case insensitive) but the current_arg
// is longer than the flag. Returns a number equal to the index
// in the char* indicating the start of the extra characters
//
// ie: when current_arg = "-foobar98023"
// this->cur_arg_strncasecmp ("-FooBar);
// will return 7
//
// Notice: this number will always be > 0
//
// ------------------------------------------------------------
//
// Case C: If neither of Case A or B is met (no match)
// then -1 is returned
int consume_arg (int number = 1);
// Consume <number> argument(s) by sticking them/it on the end of
// the vector.
int ignore_arg (int number = 1);
// Place <number> arguments in the same relative order ahead of the
// known arguemnts in the vector.
int is_anything_left (void) const;
// Returns the number of args left to see in the vector.
int is_option_next (void) const;
// Returns 1 if there's a next item in the vector and it begins with
// '-'.
int is_parameter_next (void) const;
// Returns 1 if there's a next item in the vector and it doesn't
// begin with '-'.
int num_ignored_args (void) const;
// Returns the number of irrelevant args seen.
private:
int& argc_;
// The size of the argument vector.
int total_size_;
// The size of argv_.
char** temp_;
// The temporary array over which we traverse.
char** argv_;
// The array in which the arguments are reordered.
int current_index_;
// The element in <temp_> we're currently examining.
int back_;
// The index of <argv_> in which we'll stick the next unknown
// argument.
int front_;
// The index of <argv_> in which we'll stick the next known
// argument.
};
#endif /* ACE_ARG_SHIFTER_H */
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