annotate libinterp/corefcn/strfind.cc @ 21547:ad0599a0acc6

doc: Wrap C++ docstrings to 79 characters + newline (80 total). * besselj.cc, bitfcns.cc, cellfun.cc, data.cc, debug.cc, error.cc, file-io.cc, graphics.cc, input.cc, lu.cc, matrix_type.cc, nproc.cc, pr-output.cc, quadcc.cc, regexp.cc, schur.cc, sparse.cc, strfind.cc, strfns.cc, syscalls.cc, urlwrite.cc, variables.cc, __osmesa_print__.cc, audiodevinfo.cc, audioread.cc, ccolamd.cc, chol.cc, colamd.cc, convhulln.cc, qr.cc, symbfact.cc, ov-java.cc, ov-struct.cc, ov-usr-fcn.cc, pt-arg-list.cc: doc: Wrap C++ docstrings to 79 characters + newline (80 total).
author Rik <rik@octave.org>
date Sun, 27 Mar 2016 20:39:19 -0700
parents 40de9f8f23a6
children aba2e6293dd8
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1 /*
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2
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3 Copyright (C) 2009-2015 Jaroslav Hajek
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4 Copyright (C) 2009-2010 VZLU Prague
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5
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6 This file is part of Octave.
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7
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8 Octave is free software; you can redistribute it and/or modify it
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9 under the terms of the GNU General Public License as published by the
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10 Free Software Foundation; either version 3 of the License, or (at your
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11 option) any later version.
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12
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13 Octave is distributed in the hope that it will be useful, but WITHOUT
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14 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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16 for more details.
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17
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18 You should have received a copy of the GNU General Public License
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19 along with Octave; see the file COPYING. If not, see
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20 <http://www.gnu.org/licenses/>.
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21
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22 */
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23
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24 #ifdef HAVE_CONFIG_H
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25 # include "config.h"
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26 #endif
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27
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28 #include <algorithm>
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29 #include <deque>
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30 #include <limits>
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31 #include <string>
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32
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33 #include "oct-locbuf.h"
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34
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35 #include "Cell.h"
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36 #include "ov.h"
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37 #include "defun.h"
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38 #include "unwind-prot.h"
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39 #include "errwarn.h"
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40 #include "utils.h"
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41
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42 // This allows safe indexing with char.
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43 // In C++, char may be (and often is) signed!
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44 #define ORD(ch) static_cast<unsigned char>(ch)
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45 #define TABSIZE (std::numeric_limits<unsigned char>::max () + 1)
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47 // This is the quick search algorithm, as described at
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48 // http://www-igm.univ-mlv.fr/~lecroq/string/node19.html
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49 static void
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50 qs_preprocess (const Array<char>& needle,
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51 octave_idx_type *table)
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52 {
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53 const char *x = needle.data ();
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54 octave_idx_type m = needle.numel ();
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55
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56 for (octave_idx_type i = 0; i < TABSIZE; i++)
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57 table[i] = m + 1;
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58 for (octave_idx_type i = 0; i < m; i++)
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59 table[ORD(x[i])] = m - i;
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60 }
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62
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63 static Array<octave_idx_type>
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64 qs_search (const Array<char>& needle,
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65 const Array<char>& haystack,
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66 const octave_idx_type *table,
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67 bool overlaps = true)
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68 {
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69 const char *x = needle.data ();
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70 octave_idx_type m = needle.numel ();
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71 const char *y = haystack.data ();
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72 octave_idx_type n = haystack.numel ();
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73
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74 // We'll use deque because it typically has the most favorable properties for
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75 // the operation we need.
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76 std::deque<octave_idx_type> accum;
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77 if (m == 1)
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78 {
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79 // Looking for a single character.
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80 for (octave_idx_type i = 0; i < n; i++)
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81 {
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82 if (y[i] == x[0])
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83 accum.push_back (i);
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84 }
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85 }
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86 else if (m == 2)
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87 {
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88 // Two characters.
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89 if (overlaps)
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90 {
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91 for (octave_idx_type i = 0; i < n-1; i++)
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92 {
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93 if (y[i] == x[0] && y[i+1] == x[1])
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94 accum.push_back (i);
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95 }
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96 }
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97 else
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98 {
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99 for (octave_idx_type i = 0; i < n-1; i++)
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100 {
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101 if (y[i] == x[0] && y[i+1] == x[1])
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102 accum.push_back (i++);
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103 }
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104 }
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105 }
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106 else if (n >= m)
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107 {
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108 // General case.
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109 octave_idx_type j = 0;
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110
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111 if (overlaps)
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112 {
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113 while (j < n - m)
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114 {
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115 if (std::equal (x, x + m, y + j))
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116 accum.push_back (j);
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117 j += table[ORD(y[j + m])];
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118 }
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119 }
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120 else
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121 {
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122 while (j < n - m)
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123 {
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124 if (std::equal (x, x + m, y + j))
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125 {
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126 accum.push_back (j);
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127 j += m;
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128 }
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129 else
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130 j += table[ORD(y[j + m])];
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131 }
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132 }
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133
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134 if (j == n - m && std::equal (x, x + m, y + j))
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135 accum.push_back (j);
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136 }
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137
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138 octave_idx_type nmatch = accum.size ();
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139 octave_idx_type one = 1;
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140 Array<octave_idx_type> result (dim_vector (std::min (one, nmatch), nmatch));
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141 octave_idx_type k = 0;
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142 for (std::deque<octave_idx_type>::const_iterator iter = accum.begin ();
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143 iter != accum.end (); iter++)
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144 {
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145 result.xelem (k++) = *iter;
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146 }
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147
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148 return result;
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149 }
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150
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151 DEFUN (strfind, args, ,
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152 "-*- texinfo -*-\n\
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153 @deftypefn {} {@var{idx} =} strfind (@var{str}, @var{pattern})\n\
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154 @deftypefnx {} {@var{idx} =} strfind (@var{cellstr}, @var{pattern})\n\
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155 @deftypefnx {} {@var{idx} =} strfind (@dots{}, \"overlaps\", @var{val})\n\
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156 Search for @var{pattern} in the string @var{str} and return the starting\n\
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157 index of every such occurrence in the vector @var{idx}.\n\
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158 \n\
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159 If there is no such occurrence, or if @var{pattern} is longer than\n\
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160 @var{str}, or if @var{pattern} itself is empty, then @var{idx} is the empty\n\
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161 array @code{[]}.\n\
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162 \n\
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163 The optional argument @qcode{\"overlaps\"} determines whether the pattern\n\
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164 can match at every position in @var{str} (true), or only for unique\n\
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165 occurrences of the complete pattern (false). The default is true.\n\
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166 \n\
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167 If a cell array of strings @var{cellstr} is specified then @var{idx} is a\n\
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168 cell array of vectors, as specified above.\n\
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169 \n\
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170 Examples:\n\
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171 \n\
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172 @example\n\
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173 @group\n\
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174 strfind (\"abababa\", \"aba\")\n\
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175 @result{} [1, 3, 5]\n\
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176 \n\
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177 strfind (\"abababa\", \"aba\", \"overlaps\", false)\n\
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178 @result{} [1, 5]\n\
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179 \n\
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180 strfind (@{\"abababa\", \"bebebe\", \"ab\"@}, \"aba\")\n\
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181 @result{}\n\
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182 @{\n\
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183 [1,1] =\n\
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184 \n\
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185 1 3 5\n\
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186 \n\
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187 [1,2] = [](1x0)\n\
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188 [1,3] = [](1x0)\n\
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189 @}\n\
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190 @end group\n\
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191 @end example\n\
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192 @seealso{findstr, strmatch, regexp, regexpi, find}\n\
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193 @end deftypefn")
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194 {
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195 int nargin = args.length ();
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196
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197 if (nargin != 4 && nargin != 2)
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198 print_usage ();
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199
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200 bool overlaps = true;
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201 if (nargin == 4)
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202 {
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203 if (! args(2).is_string () || ! args(3).is_scalar_type ())
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204 error ("strfind: invalid optional arguments");
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205
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206 std::string opt = args(2).string_value ();
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207
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208 if (opt == "overlaps")
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209 overlaps = args(3).bool_value ();
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210 else
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211 error ("strfind: unknown option: %s", opt.c_str ());
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212 }
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213
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214 octave_value retval;
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215
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216 octave_value argstr = args(0);
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217 octave_value argpat = args(1);
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218
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219 if (argpat.is_string ())
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220 {
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221 Array<char> needle = argpat.char_array_value ();
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222 OCTAVE_LOCAL_BUFFER (octave_idx_type, table, TABSIZE);
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223 qs_preprocess (needle, table);
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224
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225 if (argstr.is_string ())
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226 if (argpat.is_empty ())
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227 // Return a null matrix for null pattern for MW compatibility
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228 retval = Matrix ();
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229 else
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230 retval = octave_value (qs_search (needle,
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231 argstr.char_array_value (),
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232 table, overlaps),
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233 true, true);
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234 else if (argstr.is_cell ())
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235 {
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236 const Cell argsc = argstr.cell_value ();
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237 Cell retc (argsc.dims ());
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238 octave_idx_type ns = argsc.numel ();
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239
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240 for (octave_idx_type i = 0; i < ns; i++)
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241 {
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242 octave_value argse = argsc(i);
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243 if (! argse.is_string ())
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244 error ("strfind: each element of CELLSTR must be a string");
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245
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246 if (argpat.is_empty ())
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247 retc(i) = Matrix ();
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248 else
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249 retc(i) = octave_value (qs_search (needle,
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250 argse.char_array_value (),
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251 table, overlaps),
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252 true, true);
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253 }
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254
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255 retval = retc;
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256 }
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257 else
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258 error ("strfind: first argument must be a string or cell array of strings");
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259 }
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260 else if (argpat.is_cell ())
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261 retval = do_simple_cellfun (Fstrfind, "strfind", args);
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262 else
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263 error ("strfind: PATTERN must be a string or cell array of strings");
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264
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265 return retval;
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266 }
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267
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268 /*
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269 %!assert (strfind ("abababa", "aba"), [1, 3, 5])
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270 %!assert (strfind ("abababa", "aba", "overlaps", false), [1, 5])
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271 %!assert (strfind ({"abababa", "bla", "bla"}, "a"), {[1, 3, 5, 7], 3, 3})
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272 %!assert (strfind ("Linux _is_ user-friendly. It just isn't ignorant-friendly or idiot-friendly.", "friendly"), [17, 50, 68])
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273 %!assert (strfind ("abc", ""), [])
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274 %!assert (strfind ("abc", {"", "b", ""}), {[], 2, []})
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275 %!assert (strfind ({"abc", "def"}, ""), {[], []})
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276
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277 %!error strfind ()
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278 %!error strfind ("foo", "bar", 1)
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279 %!error <unknown option: foobar> strfind ("foo", 100, "foobar", 1)
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280 %!error <each element of CELLSTR must be a string> strfind ({"A", 1}, "foo")
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281 %!error <first argument must be a string> strfind (100, "foo")
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282 %!error <PATTERN must be a string> strfind ("foo", 100)
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283 */
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284
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285 static Array<char>
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286 qs_replace (const Array<char>& str, const Array<char>& pat,
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287 const Array<char>& rep,
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288 const octave_idx_type *table,
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289 bool overlaps = true)
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290 {
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291 Array<char> ret = str;
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292
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293 octave_idx_type siz = str.numel ();
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294 octave_idx_type psiz = pat.numel ();
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295 octave_idx_type rsiz = rep.numel ();
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296
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297 if (psiz != 0)
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298 {
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299 // Look up matches, without overlaps.
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300 const Array<octave_idx_type> idx = qs_search (pat, str, table, overlaps);
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301 octave_idx_type nidx = idx.numel ();
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302
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303 if (nidx)
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304 {
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305 // Compute result size.
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306 octave_idx_type retsiz;
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307 if (overlaps)
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308 {
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309 retsiz = 0;
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310 // OMG. Is this the "right answer" MW always looks for, or
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311 // someone was just lazy?
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312 octave_idx_type k = 0;
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313 for (octave_idx_type i = 0; i < nidx; i++)
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314 {
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315 octave_idx_type j = idx(i);
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316 if (j >= k)
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317 retsiz += j - k;
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318 retsiz += rsiz;
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319 k = j + psiz;
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320 }
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321
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322 retsiz += siz - k;
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323 }
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324 else
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325 retsiz = siz + nidx * (rsiz - psiz);
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326
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327 if (retsiz == 0)
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328 ret.clear (dim_vector (0, 0));
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329 else
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330 {
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331 ret.clear (dim_vector (1, retsiz));
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332 const char *src = str.data ();
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333 const char *reps = rep.data ();
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334 char *dest = ret.fortran_vec ();
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335
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336 octave_idx_type k = 0;
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337 for (octave_idx_type i = 0; i < nidx; i++)
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338 {
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339 octave_idx_type j = idx(i);
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340 if (j >= k)
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341 dest = std::copy (src + k, src + j, dest);
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342 dest = std::copy (reps, reps + rsiz, dest);
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343 k = j + psiz;
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344 }
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345
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346 std::copy (src + k, src + siz, dest);
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347 }
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348 }
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349 }
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350
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351 return ret;
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352 }
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353
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354 DEFUN (strrep, args, ,
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355 "-*- texinfo -*-\n\
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356 @deftypefn {} {@var{newstr} =} strrep (@var{str}, @var{ptn}, @var{rep})\n\
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357 @deftypefnx {} {@var{newstr} =} strrep (@var{cellstr}, @var{ptn}, @var{rep})\n\
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358 @deftypefnx {} {@var{newstr} =} strrep (@dots{}, \"overlaps\", @var{val})\n\
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359 Replace all occurrences of the pattern @var{ptn} in the string @var{str}\n\
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360 with the string @var{rep} and return the result.\n\
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361 \n\
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362 The optional argument @qcode{\"overlaps\"} determines whether the pattern\n\
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363 can match at every position in @var{str} (true), or only for unique\n\
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364 occurrences of the complete pattern (false). The default is true.\n\
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365 \n\
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366 @var{s} may also be a cell array of strings, in which case the replacement\n\
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367 is done for each element and a cell array is returned.\n\
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368 \n\
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369 Example:\n\
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370 \n\
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371 @example\n\
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372 @group\n\
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373 strrep (\"This is a test string\", \"is\", \"&%$\")\n\
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374 @result{} \"Th&%$ &%$ a test string\"\n\
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375 @end group\n\
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376 @end example\n\
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377 \n\
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378 @seealso{regexprep, strfind, findstr}\n\
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379 @end deftypefn")
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380 {
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381 int nargin = args.length ();
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382
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383 if (nargin != 3 && nargin != 5)
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384 print_usage ();
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385
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386 bool overlaps = true;
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387
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388 if (nargin == 5)
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389 {
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390 if (! args(3).is_string () || ! args(4).is_scalar_type ())
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391 error ("strrep: invalid optional arguments");
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392
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393 std::string opt = args(3).string_value ();
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394 if (opt == "overlaps")
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395 overlaps = args(4).bool_value ();
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396 else
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diff changeset
397 error ("strrep: unknown option: %s", opt.c_str ());
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398 }
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399
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diff changeset
400 octave_value retval;
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401
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402 octave_value argstr = args(0);
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403 octave_value argpat = args(1);
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diff changeset
404 octave_value argrep = args(2);
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diff changeset
405
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diff changeset
406 if (argpat.is_string () && argrep.is_string ())
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407 {
20801
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408 const Array<char> pat = argpat.char_array_value ();
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409 const Array<char> rep = argrep.char_array_value ();
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diff changeset
410
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411 OCTAVE_LOCAL_BUFFER (octave_idx_type, table, TABSIZE);
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diff changeset
412 qs_preprocess (pat, table);
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diff changeset
413
20801
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diff changeset
414 if (argstr.is_string ())
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415 retval = qs_replace (argstr.char_array_value (), pat, rep,
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diff changeset
416 table, overlaps);
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diff changeset
417 else if (argstr.is_cell ())
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418 {
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419 const Cell argsc = argstr.cell_value ();
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420 Cell retc (argsc.dims ());
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421 octave_idx_type ns = argsc.numel ();
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422
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423 for (octave_idx_type i = 0; i < ns; i++)
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424 {
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425 octave_value argse = argsc(i);
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426 if (argse.is_string ())
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427 retc(i) = qs_replace (argse.char_array_value (), pat, rep,
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428 table, overlaps);
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429 else
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430 error ("strrep: each element of S must be a string");
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431 }
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432
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433 retval = retc;
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434 }
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435 else
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436 error ("strrep: S must be a string or cell array of strings");
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437 }
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438 else if (argpat.is_cell () || argrep.is_cell ())
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439 retval = do_simple_cellfun (Fstrrep, "strrep", args);
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440 else
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441 error ("strrep: PTN and REP arguments must be strings or cell arrays of strings");
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442
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443 return retval;
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444 }
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445
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446 /*
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447 %!assert (strrep ("This is a test string", "is", "&%$"),
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448 %! "Th&%$ &%$ a test string")
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449 %!assert (strrep ("abababc", "abab", "xyz"), "xyzxyzc")
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450 %!assert (strrep ("abababc", "abab", "xyz", "overlaps", false), "xyzabc")
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451
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452 %!assert (size (strrep ("a", "a", "")), [0 0])
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453
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454 %!error strrep ()
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455 %!error strrep ("foo", "bar", 3, 4)
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456 */