Mercurial > octave-nkf
annotate libinterp/corefcn/strfind.cc @ 20654:b65888ec820e draft default tip gccjit
dmalcom gcc jit import
author | Stefan Mahr <dac922@gmx.de> |
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date | Fri, 27 Feb 2015 16:59:36 +0100 |
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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 | |
25 #include <config.h> | |
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" |
39 #include "gripes.h" | |
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 {Built-in Function} {@var{idx} =} strfind (@var{str}, @var{pattern})\n\ |
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154 @deftypefnx {Built-in Function} {@var{idx} =} strfind (@var{cellstr}, @var{pattern})\n\ |
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155 @deftypefnx {Built-in Function} {@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 octave_value retval; | |
196 int nargin = args.length (); | |
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197 bool overlaps = true; |
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198 |
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199 if (nargin == 4 && args(2).is_string () && args(3).is_scalar_type ()) |
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200 { |
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201 std::string opt = args(2).string_value (); |
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202 if (opt == "overlaps") |
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203 { |
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204 overlaps = args(3).bool_value (); |
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205 nargin = 2; |
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206 } |
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207 else |
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208 { |
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209 error ("strfind: unknown option: %s", opt.c_str ()); |
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210 return retval; |
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211 } |
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212 } |
10022 | 213 |
214 if (nargin == 2) | |
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 if (argpat.is_string ()) |
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220 Array<char> needle = argpat.char_array_value (); |
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221 OCTAVE_LOCAL_BUFFER (octave_idx_type, table, TABSIZE); |
10022 | 222 qs_preprocess (needle, table); |
223 | |
224 if (argstr.is_string ()) | |
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225 if (argpat.is_empty ()) |
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226 // Return a null matrix for null pattern for MW compatibility |
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227 retval = Matrix (); |
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228 else |
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229 retval = octave_value (qs_search (needle, |
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230 argstr.char_array_value (), |
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231 table, overlaps), |
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232 true, true); |
10022 | 233 else if (argstr.is_cell ()) |
234 { | |
235 const Cell argsc = argstr.cell_value (); | |
236 Cell retc (argsc.dims ()); | |
237 octave_idx_type ns = argsc.numel (); | |
238 | |
239 for (octave_idx_type i = 0; i < ns; i++) | |
240 { | |
241 octave_value argse = argsc(i); | |
242 if (argse.is_string ()) | |
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243 { |
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244 if (argpat.is_empty ()) |
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245 retc(i) = Matrix (); |
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246 else |
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247 retc(i) = octave_value (qs_search (needle, |
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248 argse.char_array_value (), |
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249 table, overlaps), |
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250 true, true); |
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251 } |
10022 | 252 else |
253 { | |
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254 error ("strfind: each element of CELLSTR must be a string"); |
10022 | 255 break; |
256 } | |
257 } | |
258 | |
259 retval = retc; | |
260 } | |
261 else | |
262 error ("strfind: first argument must be a string or cell array of strings"); | |
263 } | |
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264 else if (argpat.is_cell ()) |
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265 retval = do_simple_cellfun (Fstrfind, "strfind", args); |
10022 | 266 else |
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267 error ("strfind: PATTERN must be a string or cell array of strings"); |
10022 | 268 } |
269 else | |
270 print_usage (); | |
271 | |
272 return retval; | |
273 } | |
274 | |
275 /* | |
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276 %!assert (strfind ("abababa", "aba"), [1, 3, 5]) |
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277 %!assert (strfind ("abababa", "aba", "overlaps", false), [1, 5]) |
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278 %!assert (strfind ({"abababa", "bla", "bla"}, "a"), {[1, 3, 5, 7], 3, 3}) |
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279 %!assert (strfind ("Linux _is_ user-friendly. It just isn't ignorant-friendly or idiot-friendly.", "friendly"), [17, 50, 68]) |
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280 %!assert (strfind ("abc", ""), []) |
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281 %!assert (strfind ("abc", {"", "b", ""}), {[], 2, []}) |
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282 %!assert (strfind ({"abc", "def"}, ""), {[], []}) |
10022 | 283 |
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284 %!error strfind () |
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285 %!error strfind ("foo", "bar", 1) |
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286 %!error <unknown option: foobar> strfind ("foo", 100, "foobar", 1) |
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287 %!error <each element of CELLSTR must be a string> strfind ({"A", 1}, "foo") |
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288 %!error <first argument must be a string> strfind (100, "foo") |
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289 %!error <PATTERN must be a string> strfind ("foo", 100) |
10022 | 290 */ |
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291 |
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292 static Array<char> |
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293 qs_replace (const Array<char>& str, const Array<char>& pat, |
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294 const Array<char>& rep, |
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295 const octave_idx_type *table, |
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296 bool overlaps = true) |
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297 { |
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298 Array<char> ret = str; |
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299 |
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300 octave_idx_type siz = str.numel (); |
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301 octave_idx_type psiz = pat.numel (); |
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302 octave_idx_type rsiz = rep.numel (); |
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303 |
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304 if (psiz != 0) |
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305 { |
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306 // Look up matches, without overlaps. |
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307 const Array<octave_idx_type> idx = qs_search (pat, str, table, overlaps); |
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308 octave_idx_type nidx = idx.numel (); |
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309 |
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310 if (nidx) |
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311 { |
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312 // Compute result size. |
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313 octave_idx_type retsiz; |
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314 if (overlaps) |
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315 { |
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316 retsiz = 0; |
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317 // OMG. Is this the "right answer" MW always looks for, or |
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318 // someone was just lazy? |
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319 octave_idx_type k = 0; |
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320 for (octave_idx_type i = 0; i < nidx; i++) |
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321 { |
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322 octave_idx_type j = idx(i); |
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323 if (j >= k) |
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324 retsiz += j - k; |
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325 retsiz += rsiz; |
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326 k = j + psiz; |
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327 } |
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328 |
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329 retsiz += siz - k; |
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330 } |
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331 else |
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332 retsiz = siz + nidx * (rsiz - psiz); |
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333 |
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334 if (retsiz == 0) |
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335 ret.clear (dim_vector (0, 0)); |
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336 else |
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337 { |
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338 ret.clear (dim_vector (1, retsiz)); |
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339 const char *src = str.data (); |
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340 const char *reps = rep.data (); |
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341 char *dest = ret.fortran_vec (); |
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342 |
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343 octave_idx_type k = 0; |
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344 for (octave_idx_type i = 0; i < nidx; i++) |
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345 { |
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346 octave_idx_type j = idx(i); |
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347 if (j >= k) |
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348 dest = std::copy (src + k, src + j, dest); |
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349 dest = std::copy (reps, reps + rsiz, dest); |
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350 k = j + psiz; |
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351 } |
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352 |
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353 std::copy (src + k, src + siz, dest); |
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354 } |
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355 } |
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356 } |
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357 |
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358 return ret; |
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359 } |
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360 |
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361 DEFUN (strrep, args, , |
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362 "-*- texinfo -*-\n\ |
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363 @deftypefn {Built-in Function} {@var{newstr} =} strrep (@var{str}, @var{ptn}, @var{rep})\n\ |
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364 @deftypefnx {Built-in Function} {@var{newstr} =} strrep (@var{cellstr}, @var{ptn}, @var{rep})\n\ |
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365 @deftypefnx {Built-in Function} {@var{newstr} =} strrep (@dots{}, \"overlaps\", @var{val})\n\ |
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366 Replace all occurrences of the pattern @var{ptn} in the string @var{str}\n\ |
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367 with the string @var{rep} and return the result.\n\ |
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368 \n\ |
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369 The optional argument @qcode{\"overlaps\"} determines whether the pattern\n\ |
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370 can match at every position in @var{str} (true), or only for unique\n\ |
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371 occurrences of the complete pattern (false). The default is true.\n\ |
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372 \n\ |
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373 @var{s} may also be a cell array of strings, in which case the replacement is\n\ |
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374 done for each element and a cell array is returned.\n\ |
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375 \n\ |
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376 Example:\n\ |
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377 \n\ |
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378 @example\n\ |
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379 @group\n\ |
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380 strrep (\"This is a test string\", \"is\", \"&%$\")\n\ |
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381 @result{} \"Th&%$ &%$ a test string\"\n\ |
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382 @end group\n\ |
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383 @end example\n\ |
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384 \n\ |
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385 @seealso{regexprep, strfind, findstr}\n\ |
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386 @end deftypefn") |
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387 { |
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388 octave_value retval; |
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389 int nargin = args.length (); |
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390 bool overlaps = true; |
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391 |
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392 if (nargin == 5 && args(3).is_string () && args(4).is_scalar_type ()) |
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393 { |
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394 std::string opt = args(3).string_value (); |
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395 if (opt == "overlaps") |
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396 { |
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397 overlaps = args(4).bool_value (); |
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398 nargin = 3; |
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399 } |
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400 else |
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401 { |
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402 error ("strrep: unknown option: %s", opt.c_str ()); |
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403 return retval; |
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404 } |
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405 } |
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406 |
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407 if (nargin == 3) |
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408 { |
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409 octave_value argstr = args(0); |
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410 octave_value argpat = args(1); |
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411 octave_value argrep = args(2); |
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412 if (argpat.is_string () && argrep.is_string ()) |
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413 { |
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414 const Array<char> pat = argpat.char_array_value (); |
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415 const Array<char> rep = argrep.char_array_value (); |
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416 |
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417 OCTAVE_LOCAL_BUFFER (octave_idx_type, table, TABSIZE); |
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418 qs_preprocess (pat, table); |
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419 |
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420 if (argstr.is_string ()) |
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421 retval = qs_replace (argstr.char_array_value (), pat, rep, |
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422 table, overlaps); |
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423 else if (argstr.is_cell ()) |
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424 { |
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425 const Cell argsc = argstr.cell_value (); |
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426 Cell retc (argsc.dims ()); |
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427 octave_idx_type ns = argsc.numel (); |
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428 |
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429 for (octave_idx_type i = 0; i < ns; i++) |
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430 { |
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431 octave_value argse = argsc(i); |
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432 if (argse.is_string ()) |
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433 retc(i) = qs_replace (argse.char_array_value (), pat, rep, |
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434 table, overlaps); |
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435 else |
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436 { |
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437 error ("strrep: each element of S must be a string"); |
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438 break; |
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439 } |
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440 } |
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441 |
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442 retval = retc; |
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443 } |
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444 else |
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445 error ("strrep: S must be a string or cell array of strings"); |
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446 } |
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447 else if (argpat.is_cell () || argrep.is_cell ()) |
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448 retval = do_simple_cellfun (Fstrrep, "strrep", args); |
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449 else |
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450 error ("strrep: PTN and REP arguments must be strings or cell arrays of strings"); |
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451 } |
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452 else |
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453 print_usage (); |
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454 |
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455 return retval; |
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456 } |
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457 |
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458 /* |
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459 %!assert (strrep ("This is a test string", "is", "&%$"), |
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460 %! "Th&%$ &%$ a test string") |
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461 %!assert (strrep ("abababc", "abab", "xyz"), "xyzxyzc") |
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462 %!assert (strrep ("abababc", "abab", "xyz", "overlaps", false), "xyzabc") |
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463 |
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464 %!assert (size (strrep ("a", "a", "")), [0 0]) |
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465 |
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466 %!error strrep () |
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467 %!error strrep ("foo", "bar", 3, 4) |
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468 */ |