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annotate scripts/strings/strtok.m @ 17535:c12c688a35ed default tip lyh

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Fix warnings
author LYH <lyh.kernel@gmail.com>
date Fri, 27 Sep 2013 17:43:27 +0800
parents 333243133364
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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72c96de7a403 maint: update copyright notices for 2012
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1 ## Copyright (C) 2000-2012 Paul Kienzle
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2 ##
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3 ## This file is part of Octave.
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4 ##
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5 ## Octave is free software; you can redistribute it and/or modify it
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6 ## under the terms of the GNU General Public License as published by
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7 ## the Free Software Foundation; either version 3 of the License, or (at
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8 ## your option) any later version.
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9 ##
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10 ## Octave is distributed in the hope that it will be useful, but
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11 ## WITHOUT ANY WARRANTY; without even the implied warranty of
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12 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 ## General Public License for more details.
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14 ##
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15 ## You should have received a copy of the GNU General Public License
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16 ## along with Octave; see the file COPYING. If not, see
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17 ## <http://www.gnu.org/licenses/>.
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18
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19 ## -*- texinfo -*-
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20 ## @deftypefn {Function File} {[@var{tok}, @var{rem}] =} strtok (@var{str})
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21 ## @deftypefnx {Function File} {[@var{tok}, @var{rem}] =} strtok (@var{str}, @var{delim})
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22 ##
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23 ## Find all characters in the string @var{str} up to, but not including, the
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24 ## first character which is in the string @var{delim}. If @var{rem} is
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25 ## requested, it contains the remainder of the string, starting at the first
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26 ## delimiter. Leading delimiters are ignored. If @var{delim} is not
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27 ## specified, whitespace is assumed. @var{str} may also be a cell array of
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28 ## strings in which case the function executes on every individual string
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29 ## and returns a cell array of tokens and remainders.
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30 ##
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31 ## Examples:
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32 ##
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33 ## @example
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34 ## @group
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35 ## strtok ("this is the life")
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36 ## @result{} "this"
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37 ##
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38 ## [tok, rem] = strtok ("14*27+31", "+-*/")
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39 ## @result{}
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40 ## tok = 14
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41 ## rem = *27+31
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42 ## @end group
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43 ## @end example
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44 ## @seealso{index, strsplit, strchr, isspace}
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45 ## @end deftypefn
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46
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47 function [tok, rem] = strtok (str, delim)
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48
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49 if (nargin < 1 || nargin > 2)
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50 print_usage ();
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51 elseif (! (ischar (str) || iscellstr (str)))
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52 error ("strtok: STR must be a string or cell array of strings.");
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53 elseif (ischar (str) && ! isvector (str) &&! isempty (str))
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54 error ("strtok: STR cannot be a 2-D character array.");
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55 endif
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56
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57 if (nargin < 2 || isempty (delim))
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58 ws_delim = true;
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59 else
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60 ws_delim = false;
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61 endif
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62
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63 if (isempty (str))
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64 tok = rem = "";
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65 elseif (ischar (str))
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66 if (ws_delim)
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67 idx = isspace (str);
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68 elseif (length (delim) <= 7)
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69 ## Build index of delimiters incrementally for low N.
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70 idx = str == delim(1);
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71 for i = 2:length (delim)
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72 idx |= str == delim(i);
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73 endfor
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74 else
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75 ## Index the str into a mask of valid values. Faster for large N.
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76 f = false (256, 1);
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77 ## This is slower than it could be because of the +1 issue.
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78 f(uint8 (delim)+1) = true;
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79 ## Default goes via double -- unnecessarily long.
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80 si = uint32 (str);
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81 ## in-place is faster than str+1
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82 ++si;
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83 idx = f(si);
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84 endif
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85
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86 idx_dlim = find (idx, 1);
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87 idx_nodlim = find (! idx, 1);
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88 if (isempty (idx_dlim))
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89 ## No delimiter. Return whole string.
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90 tok = str;
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91 rem = "";
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92 elseif (idx_dlim > idx_nodlim)
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93 ## Normal case. No leading delimiters and at least 1 delimiter in STR.
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94 tok = str(1:idx_dlim-1);
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95 rem = str(idx_dlim:end);
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96 else
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97 ## Leading delimiter found.
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98 idx_dlim = find (idx(idx_nodlim+1:end), 1);
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99 if (isempty (idx_dlim))
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100 ## No further delimiters. Return STR stripped of delimiter prefix.
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101 tok = str(idx_nodlim:end);
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102 rem = "";
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103 else
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104 ## Strip delimiter prefix. Return STR up to 1st delimiter
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105 tok = str(idx_nodlim:(idx_dlim + idx_nodlim -1));
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106 rem = str((idx_dlim + idx_nodlim):end);
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107 endif
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108 endif
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109 else # Cell array of strings
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110 if (ws_delim)
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111 delim = '\s';
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112 endif
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113 ptn = [ '^[' delim ']*','([^' delim ']+)','([' delim '].*)$' ];
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114 matches = regexp (str, ptn, "tokens");
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115 eidx = cellfun ("isempty", matches);
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116 midx = ! eidx;
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117 tok = cell (size (str));
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118 tok(eidx) = regexprep (str(eidx), [ '^[' delim ']+' ], '');
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119 ## Unwrap doubly nested cell array from regexp
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120 tmp = [matches{midx}];
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121 if (! isempty (tmp))
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122 tmp = [tmp{:}];
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123 endif
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124 tok(midx) = tmp(1:2:end);
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125 if (isargout (2))
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126 rem = cell (size (str));
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127 rem(eidx) = {""};
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128 rem(midx) = tmp(2:2:end);
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129 endif
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130 endif
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131
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132 endfunction
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133
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134
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135 %!demo
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136 %! strtok ("this is the life")
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137 %! % split at the first space, returning "this"
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138
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139 %!demo
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140 %! s = "14*27+31"
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141 %! while (1)
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142 %! [t, s] = strtok (s, "+-*/");
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143 %! printf ("<%s>", t);
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144 %! if (isempty (s))
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145 %! break;
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146 %! endif
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147 %! printf ("<%s>", s(1));
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148 %! endwhile
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149 %! printf ("\n");
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150 %! % ----------------------------------------------------
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151 %! % Demonstrates processing of an entire string split on
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152 %! % a variety of delimiters. Tokens and delimiters are
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153 %! % printed one after another in angle brackets.
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154
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155 %% Test the tokens for all cases
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156 %!assert (strtok (""), ""); # no string
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157 %!assert (strtok ("this"), "this"); # no delimiter in string
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158 %!assert (strtok ("this "), "this"); # delimiter at end
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159 %!assert (strtok ("this is"), "this"); # delimiter in middle
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160 %!assert (strtok (" this"), "this"); # delimiter at start
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161 %!assert (strtok (" this "), "this"); # delimiter at start and end
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162 %!assert (strtok (" "), ""(1:0)); # delimiter only
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163
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164 %% Test the remainder for all cases
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165 %!test [t,r] = strtok (""); assert (r, "");
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166 %!test [t,r] = strtok ("this"); assert (r, "");
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167 %!test [t,r] = strtok ("this "); assert (r, " ");
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168 %!test [t,r] = strtok ("this is"); assert (r, " is");
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169 %!test [t,r] = strtok (" this"); assert (r, "");
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170 %!test [t,r] = strtok (" this "); assert (r, " ");
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171 %!test [t,r] = strtok (" "); assert (r, "");
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172
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173 %% Test all tokens and remainders with cell array input
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174 %!test
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175 %! str = {"", "this", "this ", "this is", " this", " this ", " "};
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176 %! [t, r] = strtok (str);
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177 %! assert (t{1}, "");
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178 %! assert (r{1}, "");
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179 %! assert (t{2}, "this");
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180 %! assert (r{2}, "");
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181 %! assert (t{3}, "this");
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182 %! assert (r{3}, " ");
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183 %! assert (t{4}, "this");
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184 %! assert (r{4}, " is");
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185 %! assert (t{5}, "this");
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186 %! assert (r{5}, "");
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187 %! assert (t{6}, "this");
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188 %! assert (r{6}, " ");
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189 %! assert (t{7}, "");
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190 %! assert (r{7}, "");
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191
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192 %% Simple check for 2, 3, and 4 delimeters
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193 %!assert (strtok ("this is", "i "), "th")
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194 %!assert (strtok ("this is", "ij "), "th")
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195 %!assert (strtok ("this is", "ijk "), "th")
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196
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197 %% Test all cases for 8 delimiters since a different
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198 %!# algorithm is used when more than 7 delimiters
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199 %!assert (strtok ("","jklmnop "), "")
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200 %!assert (strtok ("this","jklmnop "), "this")
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201 %!assert (strtok ("this ","jklmnop "), "this")
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202 %!assert (strtok ("this is","jklmnop "), "this")
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203 %!assert (strtok (" this","jklmnop "), "this")
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204 %!assert (strtok (" this ","jklmnop "), "this")
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205 %!assert (strtok (" ","jklmnop "), ""(1:0))
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206
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207 %% Test 'bad' string orientations
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208 %!assert (strtok (" this ".'), "this".'); # delimiter at start and end
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209 %!assert (strtok (" this ".',"jkl "), "this".');
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210
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211 %% Test with TAB, LF, VT, FF, and CR
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212 %!test
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213 %! for ch = "\t\n\v\f\r"
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214 %! [t, r] = strtok (["beg", ch, "end"]);
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215 %! assert (t, "beg");
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216 %! assert (r, [ch, "end"]);
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217 %! endfor
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218
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219 %% Test input validation
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220 %!error strtok ()
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221 %!error strtok ("a", "b", "c")
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222 %!error <STR must be a string> strtok (1, "b")
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223 %!error <STR cannot be a 2-D> strtok (char ("hello", "world"), "l")
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224