Mercurial > octave
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> |
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date | Sun, 27 Mar 2016 20:39:19 -0700 |
parents | 40de9f8f23a6 |
children | aba2e6293dd8 |
rev | line source |
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10022 | 1 /* |
2 | |
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3 Copyright (C) 2009-2015 Jaroslav Hajek |
11523 | 4 Copyright (C) 2009-2010 VZLU Prague |
10022 | 5 |
6 This file is part of Octave. | |
7 | |
8 Octave is free software; you can redistribute it and/or modify it | |
9 under the terms of the GNU General Public License as published by the | |
10 Free Software Foundation; either version 3 of the License, or (at your | |
11 option) any later version. | |
12 | |
13 Octave is distributed in the hope that it will be useful, but WITHOUT | |
14 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
16 for more details. | |
17 | |
18 You should have received a copy of the GNU General Public License | |
19 along with Octave; see the file COPYING. If not, see | |
20 <http://www.gnu.org/licenses/>. | |
21 | |
22 */ | |
23 | |
24 #ifdef HAVE_CONFIG_H | |
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25 # include "config.h" |
10022 | 26 #endif |
27 | |
28 #include <algorithm> | |
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29 #include <deque> |
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30 #include <limits> |
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31 #include <string> |
10022 | 32 |
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33 #include "oct-locbuf.h" |
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34 |
10022 | 35 #include "Cell.h" |
36 #include "ov.h" | |
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37 #include "defun.h" |
10022 | 38 #include "unwind-prot.h" |
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39 #include "errwarn.h" |
10022 | 40 #include "utils.h" |
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! |
10022 | 44 #define ORD(ch) static_cast<unsigned char>(ch) |
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45 #define TABSIZE (std::numeric_limits<unsigned char>::max () + 1) |
10022 | 46 |
47 // This is the quick search algorithm, as described at | |
48 // http://www-igm.univ-mlv.fr/~lecroq/string/node19.html | |
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49 static void |
10022 | 50 qs_preprocess (const Array<char>& needle, |
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51 octave_idx_type *table) |
10022 | 52 { |
53 const char *x = needle.data (); | |
54 octave_idx_type m = needle.numel (); | |
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; |
10022 | 60 } |
61 | |
62 | |
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63 static Array<octave_idx_type> |
10022 | 64 qs_search (const Array<char>& needle, |
65 const Array<char>& haystack, | |
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66 const octave_idx_type *table, |
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67 bool overlaps = true) |
10022 | 68 { |
69 const char *x = needle.data (); | |
70 octave_idx_type m = needle.numel (); | |
71 const char *y = haystack.data (); | |
72 octave_idx_type n = haystack.numel (); | |
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) |
10022 | 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. |
10022 | 109 octave_idx_type j = 0; |
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); |
10022 | 136 } |
137 | |
138 octave_idx_type nmatch = accum.size (); | |
10258 | 139 octave_idx_type one = 1; |
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 } |
10022 | 147 |
148 return result; | |
149 } | |
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\ |
10022 | 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\ |
10022 | 171 \n\ |
172 @example\n\ | |
173 @group\n\ | |
174 strfind (\"abababa\", \"aba\")\n\ | |
175 @result{} [1, 3, 5]\n\ | |
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\ |
10022 | 180 strfind (@{\"abababa\", \"bebebe\", \"ab\"@}, \"aba\")\n\ |
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181 @result{}\n\ |
10022 | 182 @{\n\ |
183 [1,1] =\n\ | |
184 \n\ | |
185 1 3 5\n\ | |
186 \n\ | |
187 [1,2] = [](1x0)\n\ | |
188 [1,3] = [](1x0)\n\ | |
189 @}\n\ | |
190 @end group\n\ | |
191 @end example\n\ | |
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192 @seealso{findstr, strmatch, regexp, regexpi, find}\n\ |
10022 | 193 @end deftypefn") |
194 { | |
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 } |
10022 | 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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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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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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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); |
10022 | 253 } |
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254 |
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255 retval = retc; |
10022 | 256 } |
257 else | |
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258 error ("strfind: first argument must be a string or cell array of strings"); |
10022 | 259 } |
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260 else if (argpat.is_cell ()) |
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261 retval = do_simple_cellfun (Fstrfind, "strfind", args); |
10022 | 262 else |
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263 error ("strfind: PATTERN must be a string or cell array of strings"); |
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265 return retval; | |
266 } | |
267 | |
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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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) |
10022 | 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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397 error ("strrep: unknown option: %s", opt.c_str ()); |
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398 } |
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399 |
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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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404 octave_value argrep = args(2); |
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405 |
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406 if (argpat.is_string () && argrep.is_string ()) |
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407 { |
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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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410 |
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411 OCTAVE_LOCAL_BUFFER (octave_idx_type, table, TABSIZE); |
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412 qs_preprocess (pat, table); |
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413 |
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414 if (argstr.is_string ()) |
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415 retval = qs_replace (argstr.char_array_value (), pat, rep, |
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416 table, overlaps); |
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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 */ |