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str-vec.cc

解説を見る。

/*

Copyright (C) 1996, 1997 John W. Eaton

This file is part of Octave.

Octave is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the
Free Software Foundation; either version 2, or (at your option) any
later version.

Octave is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
for more details.

You should have received a copy of the GNU General Public License
along with Octave; see the file COPYING.  If not, write to the Free
Software Foundation, 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.

*/

/*

The function string_vector::list_in_columns was adapted from a similar
function distributed in the GNU file utilities, copyright (C) 85, 88,
90, 91, 95, 1996 Free Software Foundation, Inc.

*/

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <iostream>
#include <string>

#include "cmd-edit.h"
#include "lo-utils.h"
#include "str-vec.h"

// Create a string vector from a NULL terminated list of C strings.

string_vector::string_vector (const char * const *s)
  : Array<std::string> ()
{
  int n = 0;

  const char * const *t = s;

  while (*t++)
    n++;

  resize (n);

  for (int i = 0; i < n; i++)
    elem (i) = s[i];
}

// Create a string vector from up to N C strings.  Assumes that N is
// nonnegative.

string_vector::string_vector (const char * const *s, int n)
  : Array<std::string> (n)
{
  for (int i = 0; i < n; i++)
    elem (i) = s[i];
}

int
string_vector::compare (const void *a_arg, const void *b_arg)
{
  const std::string *a = (const std::string *) a_arg;
  const std::string *b = (const std::string *) b_arg;

  return a->compare (*b);
}

string_vector&
string_vector::uniq (void)
{
  int len = length ();

  if (len > 0)
    {
      int k = 0;

      for (int i = 1; i < len; i++)
        if (elem(i) != elem(k))
          if (++k != i)
            elem(k) = elem(i);

      if (len != ++k)
        resize (k);
    }

  return *this;
}

string_vector&
string_vector::append (const std::string& s)
{
  int len = length ();

  resize (len + 1);

  elem(len) = s;

  return *this;
}

string_vector&
string_vector::append (const string_vector& sv)
{
  int len = length ();
  int sv_len = sv.length ();
  int new_len = len + sv_len;

  resize (new_len);

  for (int i = 0; i < sv_len; i++)
    elem(len + i) = sv[i];

  return *this;
}

char **
string_vector::c_str_vec (void) const
{
  int len = length ();

  char **retval = new char * [len + 1];

  retval [len] = 0;

  for (int i = 0; i < len; i++)
    retval[i] = strsave (elem(i).c_str ());

  return retval;
}

void
string_vector::delete_c_str_vec (const char * const *v)
{
  while (*v)
    delete [] *v;

  delete [] v;
}

// Format a list in neat columns.

std::ostream&
string_vector::list_in_columns (std::ostream& os) const
{
  // Compute the maximum name length.

  int max_name_length = 0;
  int total_names = length ();

  for (int i = 0; i < total_names; i++)
    {
      int name_length = elem (i).length ();
      if (name_length > max_name_length)
        max_name_length = name_length;
    }

  // Allow at least two spaces between names.

  max_name_length += 2;

  // Calculate the maximum number of columns that will fit.

  int line_length = command_editor::terminal_cols ();
  int nc = line_length / max_name_length;
  if (nc == 0)
    nc = 1;

  // Calculate the number of rows that will be in each column except
  // possibly  for a short column on the right.

  int nr = total_names / nc + (total_names % nc != 0);

  // Recalculate columns based on rows.

  nc = total_names / nr + (total_names % nr != 0);

  int count;
  for (int row = 0; row < nr; row++)
    {
      count = row;
      int pos = 0;

      // Print the next row.

      while (1)
        {
          std::string nm = elem (count);

          os << nm;
          int name_length = nm.length ();

          count += nr;
          if (count >= total_names)
            break;

          int spaces_to_pad = max_name_length - name_length;
          for (int i = 0; i < spaces_to_pad; i++)
            os << " ";
          pos += max_name_length;
        }
      os << "\n";
    }

  return os;
}

/*
;;; Local Variables: ***
;;; mode: C++ ***
;;; End: ***
*/

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