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annotate src/DLD-FUNCTIONS/strfind.cc @ 10358:72fab01e5d68

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improve some size_t queries
author Jaroslav Hajek <highegg@gmail.com>
date Thu, 25 Feb 2010 12:55:13 +0100
parents e317791645c4
children 4d1fc073fbb7
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1 /*
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2
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3 Copyright (C) 2009 Jaroslav Hajek
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4
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5 This file is part of Octave.
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6
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7 Octave is free software; you can redistribute it and/or modify it
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8 under the terms of the GNU General Public License as published by the
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9 Free Software Foundation; either version 3 of the License, or (at your
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10 option) any later version.
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11
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12 Octave is distributed in the hope that it will be useful, but WITHOUT
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13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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15 for more details.
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16
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17 You should have received a copy of the GNU General Public License
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18 along with Octave; see the file COPYING. If not, see
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19 <http://www.gnu.org/licenses/>.
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20
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21 */
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22
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23 #ifdef HAVE_CONFIG_H
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24 #include <config.h>
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25 #endif
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26
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27 #include <string>
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28 #include <climits>
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29 #include <algorithm>
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30 #include <deque>
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31
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32 #include "Cell.h"
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33 #include "ov.h"
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34 #include "defun-dld.h"
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35 #include "unwind-prot.h"
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36 #include "gripes.h"
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37 #include "utils.h"
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38
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39 // This allows safe indexing with char. In C++, char may be (and often is) signed!
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40 #define ORD(ch) static_cast<unsigned char>(ch)
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41 #define TABSIZE (UCHAR_MAX + 1)
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42
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43 // This is the quick search algorithm, as described at
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44 // http://www-igm.univ-mlv.fr/~lecroq/string/node19.html
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45 static void
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46 qs_preprocess (const Array<char>& needle,
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47 octave_idx_type table[TABSIZE])
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48 {
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49 const char *x = needle.data ();
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50 octave_idx_type m = needle.numel ();
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51
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52 for (octave_idx_type i = 0; i < UCHAR_MAX; i++)
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53 table[i] = m + 1;
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54 for (octave_idx_type i = 0; i < m; i++)
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55 table[ORD(x[i])] = m - i;
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56 }
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57
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58
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59 static Array<octave_idx_type>
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60 qs_search (const Array<char>& needle,
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61 const Array<char>& haystack,
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62 const octave_idx_type table[TABSIZE],
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63 bool overlaps = true)
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64 {
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65 const char *x = needle.data ();
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66 octave_idx_type m = needle.numel ();
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67 const char *y = haystack.data ();
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68 octave_idx_type n = haystack.numel ();
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69
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70 // We'll use deque because it typically has the most favorable properties for
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71 // the operation we need.
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72 std::deque<octave_idx_type> accum;
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73 if (m == 1)
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74 {
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75 // Looking for a single character.
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76 for (octave_idx_type i = 0; i < n; i++)
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77 {
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78 if (y[i] == x[0])
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79 accum.push_back (i);
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80 }
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81 }
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82 else if (m == 2)
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83 {
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84 // Two characters.
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85 if (overlaps)
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86 {
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87 for (octave_idx_type i = 0; i < n-1; i++)
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88 {
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89 if (y[i] == x[0] && y[i+1] == x[1])
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90 accum.push_back (i);
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91 }
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92 }
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93 else
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94 {
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95 for (octave_idx_type i = 0; i < n-1; i++)
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96 {
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97 if (y[i] == x[0] && y[i+1] == x[1])
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98 accum.push_back (i++);
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99 }
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100 }
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101 }
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102 else if (n >= m)
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103 {
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104 // General case.
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105 octave_idx_type j = 0;
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106
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107 if (overlaps)
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108 {
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109 while (j < n - m)
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110 {
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111 if (std::equal (x, x + m, y + j))
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112 accum.push_back (j);
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113 j += table[ORD(y[j + m])];
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114 }
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115 }
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116 else
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117 {
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118 while (j < n - m)
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119 {
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120 if (std::equal (x, x + m, y + j))
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121 {
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122 accum.push_back (j);
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123 j += m;
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124 }
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125 else
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126 j += table[ORD(y[j + m])];
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127 }
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128 }
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129
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130 if (j == n - m && std::equal (x, x + m, y + j))
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131 accum.push_back (j);
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132 }
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133
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134 octave_idx_type nmatch = accum.size ();
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135 octave_idx_type one = 1;
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136 Array<octave_idx_type> result (dim_vector (std::min (one, nmatch), nmatch));
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137 octave_idx_type k = 0;
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138 for (std::deque<octave_idx_type>::const_iterator iter = accum.begin ();
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139 iter != accum.end (); iter++)
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140 {
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141 result.xelem (k++) = *iter;
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142 }
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143
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144 return result;
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145 }
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146
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147 DEFUN_DLD (strfind, args, ,
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148 "-*- texinfo -*-\n\
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149 @deftypefn {Loadable Function} {@var{idx} =} strfind (@var{str}, @var{pattern})\n\
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150 @deftypefnx {Loadable Function} {@var{idx} =} strfind (@var{cellstr}, @var{pattern})\n\
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151 Search for @var{pattern} in the string @var{str} and return the\n\
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152 starting index of every such occurrence in the vector @var{idx}.\n\
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153 If there is no such occurrence, or if @var{pattern} is longer\n\
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154 than @var{str}, then @var{idx} is the empty array @code{[]}.\n\
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155 \n\
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156 If the cell array of strings @var{cellstr} is specified instead of the\n\
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157 string @var{str}, then @var{idx} is a cell array of vectors, as specified\n\
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158 above. Examples:\n\
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159 \n\
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160 @example\n\
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161 @group\n\
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162 strfind (\"abababa\", \"aba\")\n\
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163 @result{} [1, 3, 5]\n\
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164 \n\
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165 strfind (@{\"abababa\", \"bebebe\", \"ab\"@}, \"aba\")\n\
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166 @result{} ans =\n\
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167 @{\n\
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168 [1,1] =\n\
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169 \n\
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170 1 3 5\n\
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171 \n\
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172 [1,2] = [](1x0)\n\
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173 [1,3] = [](1x0)\n\
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174 @}\n\
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175 @end group\n\
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176 @end example\n\
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177 @seealso{findstr, strmatch, strcmp, strncmp, strcmpi, strncmpi, find}\n\
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178 @end deftypefn")
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179 {
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180 octave_value retval;
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181 int nargin = args.length ();
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182
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183 if (nargin == 2)
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184 {
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185 octave_value argstr = args(0), argpat = args(1);
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186 if (argpat.is_string ())
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187 {
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188 Array<char> needle = argpat.char_array_value ();
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189 OCTAVE_LOCAL_BUFFER (octave_idx_type, table, UCHAR_MAX);
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190 qs_preprocess (needle, table);
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191
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192 if (argstr.is_string ())
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193 retval = octave_value (qs_search (needle, argstr.char_array_value (), table),
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194 true, true);
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195 else if (argstr.is_cell ())
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196 {
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197 const Cell argsc = argstr.cell_value ();
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198 Cell retc (argsc.dims ());
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199 octave_idx_type ns = argsc.numel ();
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200
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201 for (octave_idx_type i = 0; i < ns; i++)
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202 {
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203 octave_value argse = argsc(i);
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204 if (argse.is_string ())
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205 retc(i) = octave_value (qs_search (needle, argse.char_array_value (), table),
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206 true, true);
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207 else
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208 {
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209 error ("strfind: each cell element must be a string");
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210 break;
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211 }
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212 }
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213
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214 retval = retc;
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215 }
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216 else
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217 error ("strfind: first argument must be a string or cell array of strings");
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218 }
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219 else if (argpat.is_cell ())
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220 retval = do_simple_cellfun (Fstrfind, "strfind", args);
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221 else
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222 error ("strfind: pattern must be a string or cell array of strings");
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223 }
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224 else
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225 print_usage ();
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226
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227 return retval;
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228 }
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229
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230 /*
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231
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232 %!error strfind ();
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233 %!error strfind ("foo", "bar", 1);
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234 %!error strfind ("foo", 100);
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235 %!error strfind (100, "foo");
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236
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237 %!assert (strfind ("abababa", "aba"), [1, 3, 5]);
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238 %!assert (strfind ({"abababa", "bla", "bla"}, "a"), {[1, 3, 5, 7], 3, 3});
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239 %!assert (strfind ("Linux _is_ user-friendly. It just isn't ignorant-friendly or idiot-friendly.", "friendly"), [17, 50, 68]);
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240
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241 */
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242
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243 static Array<char>
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244 qs_replace (const Array<char>& str, const Array<char>& pat,
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245 const Array<char>& rep,
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246 const octave_idx_type table[TABSIZE])
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247 {
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248 Array<char> ret = str;
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249
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250 octave_idx_type siz = str.numel (), psiz = pat.numel (), rsiz = rep.numel ();
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251
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252 if (psiz != 0)
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253 {
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254 // Look up matches, without overlaps.
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255 const Array<octave_idx_type> idx = qs_search (pat, str, table, false);
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256 octave_idx_type nidx = idx.numel ();
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257
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258 if (nidx)
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259 {
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260 // Compute result size.
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261 octave_idx_type retsiz = siz + nidx * (rsiz - psiz);
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262 ret.clear (dim_vector (1, retsiz));
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263 const char *src = str.data (), *reps = rep.data ();
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264 char *dest = ret.fortran_vec ();
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265
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266 octave_idx_type k = 0;
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267 for (octave_idx_type i = 0; i < nidx; i++)
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268 {
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269 octave_idx_type j = idx(i);
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270 dest = std::copy (src + k, src + j, dest);
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271 dest = std::copy (reps, reps + rsiz, dest);
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272 k = j + psiz;
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273 }
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274
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275 std::copy (src + k, src + siz, dest);
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276 }
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277 }
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278
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279 return ret;
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280 }
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281
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282 DEFUN_DLD (strrep, args, ,
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283 "-*- texinfo -*-\n\
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284 @deftypefn {Loadable Function} {} strrep (@var{s}, @var{x}, @var{y})\n\
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285 Replace all occurrences of the substring @var{x} of the string @var{s}\n\
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286 with the string @var{y} and return the result. For example,\n\
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287 \n\
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288 @example\n\
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289 @group\n\
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290 strrep (\"This is a test string\", \"is\", \"&%$\")\n\
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291 @result{} \"Th&%$ &%$ a test string\"\n\
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292 @end group\n\
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293 @end example\n\
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294 \n\
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295 @var{s} may also be a cell array of strings, in which case the replacement is\n\
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296 done for each element and a cell array is returned.\n\
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297 @seealso{regexprep, strfind, findstr}\n\
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298 @end deftypefn")
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299 {
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300 octave_value retval;
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301 int nargin = args.length ();
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302
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303 if (nargin == 3)
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304 {
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305 octave_value argstr = args(0), argpat = args(1), argrep = args(2);
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306 if (argpat.is_string () && argrep.is_string ())
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307 {
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308 const Array<char> pat = argpat.char_array_value ();
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309 const Array<char> rep = argrep.char_array_value ();
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310
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311 OCTAVE_LOCAL_BUFFER (octave_idx_type, table, UCHAR_MAX);
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312 qs_preprocess (pat, table);
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313
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314 if (argstr.is_string ())
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315 retval = qs_replace (argstr.char_array_value (), pat, rep, table);
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316 else if (argstr.is_cell ())
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317 {
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318 const Cell argsc = argstr.cell_value ();
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319 Cell retc (argsc.dims ());
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320 octave_idx_type ns = argsc.numel ();
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321
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322 for (octave_idx_type i = 0; i < ns; i++)
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323 {
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324 octave_value argse = argsc(i);
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325 if (argse.is_string ())
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326 retc(i) = qs_replace (argse.char_array_value (), pat, rep, table);
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327 else
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328 {
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329 error ("strrep: each cell element must be a string");
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330 break;
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331 }
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332 }
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333
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334 retval = retc;
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335 }
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336 else
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337 error ("strrep: first argument must be a string or cell array of strings");
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338 }
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339 else if (argpat.is_cell () || argrep.is_cell ())
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340 retval = do_simple_cellfun (Fstrrep, "strrep", args);
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341 else
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342 error ("strrep: x and y arguments must be strings or cell arrays of strings");
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343 }
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344 else
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345 print_usage ();
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346
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347 return retval;
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348 }
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349
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350 /*
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351
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352 %!assert(strcmp (strrep ("This is a test string", "is", "&%$"),
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353 %! "Th&%$ &%$ a test string"));
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354
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355 %!error strrep ();
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356
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357 %!error strrep ("foo", "bar", 3, 4);
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358
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359 */