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Improve speed and backward compatibility for strsplit() * scripts/strings/strsplit.m: Improve speed and backward compatibility. * NEWS: Modify entry for strsplit() for Octave 3.8.x.
author Ben Abbott <bpabbott@mac.com>
date Tue, 02 Apr 2013 19:36:52 -0400
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children 03a28487fa9d
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1 ## Copyright (C) 2009-2012 Jaroslav Hajek
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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{cstr}] =} strsplit (@var{s})
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21 ## @deftypefnx {Function File} {[@var{cstr}] =} strsplit (@var{s}, @var{del})
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22 ## @deftypefnx {Function File} {[@var{cstr}] =} strsplit (@var{s}, @var{del}, @var{collapsedelimiters})
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23 ## @deftypefnx {Function File} {[@var{cstr}] =} strsplit (@dots{}, @var{name}, @var{value})
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24 ## @deftypefnx {Function File} {[@var{cstr}, @var{matches}] =} strsplit (@dots{})
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25 ## Split the string @var{s} using the delimiters specified by @var{del}
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26 ## and return a cell array of strings. For a single delimiter, @var{del}
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27 ## may be a string, or a scalar cell-string. For multible delimiters,
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28 ## @var{del} must be a cell-string array. Unless @var{collapsedelimiters} is
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29 ## specified to be @var{false}, consecutive delimiters are collapsed into one.
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30 ##
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31 ## The second output, @var{matches}, returns the delmiters which were matched
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32 ## in the original string. The matched delimiters are uneffected by the
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33 ## @var{collapsedelimiters}.
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34 ##
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35 ## Example:
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36 ##
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37 ## @example
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38 ## @group
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39 ## strsplit ("a b c")
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40 ## @result{}
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41 ## @{
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42 ## [1,1] = a
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43 ## [1,2] = b
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44 ## [1,3] = c
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45 ## @}
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46 ##
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47 ## strsplit ("a,b,c", ",")
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48 ## @result{}
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49 ## @{
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50 ## [1,1] = a
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51 ## [1,2] = b
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52 ## [1,3] = c
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53 ## @}
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54 ##
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55 ## strsplit ("a foo b,bar c", @{"\s", "foo", "bar"@})
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56 ## @result{}
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57 ## @{
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58 ## [1,1] = a
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59 ## [1,2] = b
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60 ## [1,3] = c
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61 ## @}
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62 ##
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63 ## strsplit ("a,,b, c", @{",", " "@}, false)
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64 ## @result{}
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65 ## @{
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66 ## [1,1] = a
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67 ## [1,2] =
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68 ## [1,3] = b
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69 ## [1,4] =
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70 ## [1,5] = c
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71 ## @}
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72 ##
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73 ## @end group
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74 ## @end example
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75 ##
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76 ## Supported @var{name}/@var{value} pair arguments are;
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77 ##
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78 ## @itemize
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79 ## @item @var{collapsedelimiters} may take the value of @var{true} or @var{false}
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80 ## with the default being @var{false}.
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81 ## @item @var{delimitertype} may take the value of @code{legacy},
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82 ## @code{simple} or @code{regularexpression}.
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83 ## If @var{delimitertype} is equal to @code{legacy}, each individual
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84 ## character of @var{del} is used to split the input.
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85 ## If the specified delimiters are single characters, the default is
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86 ## @var{delimitertype} is @code{legacy}. Otherwise the default
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87 ## @var{delimitertype} is @code{simple}.
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88 ## @end itemize
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89 ##
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90 ## Example:
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91 ##
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92 ## @example
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93 ## @group
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94 ## strsplit ("a foo b,bar c", ",|\\s|foo|bar", "delimitertype", "regularexpression")
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95 ## @result{}
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96 ## @{
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97 ## [1,1] = a
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98 ## [1,2] = b
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99 ## [1,3] = c
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100 ## @}
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101 ##
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102 ## strsplit ("a,,b, c", "[, ]", false, "delimitertype", "regularexpression")
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103 ## @result{}
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104 ## @{
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105 ## [1,1] = a
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106 ## [1,2] =
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107 ## [1,3] = b
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108 ## [1,4] =
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109 ## [1,5] = c
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110 ## @}
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111 ##
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112 ## strsplit ("a,,b, c", ", ", false, "delimitertype", "legacy")
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113 ## @result{}
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114 ## @{
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115 ## [1,1] = a
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116 ## [1,2] =
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117 ## [1,3] = b
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118 ## [1,4] =
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119 ## [1,5] = c
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120 ## @}
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121 ##
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122 ## strsplit ("a,\t,b, c", @{',', '\s'@}, "delimitertype", "regularexpression")
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123 ## @result{}
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124 ## @{
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125 ## [1,1] = a
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126 ## [1,2] = b
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127 ## [1,3] = c
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128 ## @}
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129 ## @end group
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130 ## @end example
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131 ##
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132 ## @seealso{strjoin, strtok, regexp}
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133 ## @end deftypefn
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134
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135 function [result, matches] = strsplit (str, del, varargin)
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136
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137 args.collapsedelimiters = true;
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138 args.delimitertype = "default";
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139
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140 [reg, params] = parseparams (varargin);
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141
1de4ec2a856d Matlab compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 15521
diff changeset
142 if (numel (reg) > 1)
8877
2c8b2399247b implement strsplit; deprecate split
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
143 print_usage ();
16403
1de4ec2a856d Matlab compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 15521
diff changeset
144 elseif (numel (reg) == 1)
1de4ec2a856d Matlab compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 15521
diff changeset
145 if (islogical (reg{1}) || isnumeric (reg{1}))
1de4ec2a856d Matlab compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 15521
diff changeset
146 args.collapsedelimiters = reg{1};
1de4ec2a856d Matlab compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 15521
diff changeset
147 else
1de4ec2a856d Matlab compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 15521
diff changeset
148 print_usage ();
1de4ec2a856d Matlab compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 15521
diff changeset
149 endif
1de4ec2a856d Matlab compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 15521
diff changeset
150 endif
1de4ec2a856d Matlab compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 15521
diff changeset
151 fields = fieldnames (args);
1de4ec2a856d Matlab compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 15521
diff changeset
152 for n = 1:2:numel(params)
1de4ec2a856d Matlab compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 15521
diff changeset
153 if (any (strcmpi (params{n}, fields)))
1de4ec2a856d Matlab compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 15521
diff changeset
154 args.(lower(params{n})) = params{n+1};
1de4ec2a856d Matlab compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 15521
diff changeset
155 elseif (ischar (varargin{n}))
1de4ec2a856d Matlab compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 15521
diff changeset
156 error ("strsplit:invalid_parameter_name",
1de4ec2a856d Matlab compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 15521
diff changeset
157 sprintf ("strsplit: Invalid parameter name, `%s'", varargin{n}))
1de4ec2a856d Matlab compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 15521
diff changeset
158 else
1de4ec2a856d Matlab compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 15521
diff changeset
159 print_usage ();
1de4ec2a856d Matlab compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 15521
diff changeset
160 endif
1de4ec2a856d Matlab compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 15521
diff changeset
161 endfor
1de4ec2a856d Matlab compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 15521
diff changeset
162
16411
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diff changeset
163 if (strcmpi (args.delimitertype, "default"))
5be43435bd5b Improve speed and backward compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 16403
diff changeset
164 if (nargin == 1 || numel (del) == 1
5be43435bd5b Improve speed and backward compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 16403
diff changeset
165 || (nargin > 1 && (islogical (del) || isnumeric (del)))
5be43435bd5b Improve speed and backward compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 16403
diff changeset
166 || iscell (del) && all (cellfun (@numel, del) < 2))
5be43435bd5b Improve speed and backward compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 16403
diff changeset
167 ## For single character delimiters, default to "legacy"
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parents: 16403
diff changeset
168 args.delimitertype = "legacy";
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Ben Abbott <bpabbott@mac.com>
parents: 16403
diff changeset
169 else
5be43435bd5b Improve speed and backward compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 16403
diff changeset
170 ## For multi-character delimiters, default to "simple"
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Ben Abbott <bpabbott@mac.com>
parents: 16403
diff changeset
171 args.delimitertype = "simple";
5be43435bd5b Improve speed and backward compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 16403
diff changeset
172 endif
5be43435bd5b Improve speed and backward compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 16403
diff changeset
173 endif
5be43435bd5b Improve speed and backward compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 16403
diff changeset
174
16403
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Ben Abbott <bpabbott@mac.com>
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diff changeset
175 # Save the length of the "delimitertype" parameter
1de4ec2a856d Matlab compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 15521
diff changeset
176 length_deltype = numel (args.delimitertype);
1de4ec2a856d Matlab compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 15521
diff changeset
177
1de4ec2a856d Matlab compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 15521
diff changeset
178 if (nargin == 1 || (nargin > 1 && (islogical (del) || isnumeric (del))))
1de4ec2a856d Matlab compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 15521
diff changeset
179 if (nargin > 1)
1de4ec2a856d Matlab compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 15521
diff changeset
180 ## Second input is the "collapsedelimiters" parameter
1de4ec2a856d Matlab compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 15521
diff changeset
181 args.collapsedelimiters = del;
1de4ec2a856d Matlab compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 15521
diff changeset
182 endif
1de4ec2a856d Matlab compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 15521
diff changeset
183 ## Set proper default for the delimiter type
1de4ec2a856d Matlab compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 15521
diff changeset
184 if (strncmpi (args.delimitertype, "simple", numel (args.delimitertype)))
1de4ec2a856d Matlab compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 15521
diff changeset
185 del = {" ","\f","\n","\r","\t","\v"};
16411
5be43435bd5b Improve speed and backward compatibility for strsplit()
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parents: 16403
diff changeset
186 elseif (strncmpi (args.delimitertype, "legacy", numel (args.delimitertype)))
5be43435bd5b Improve speed and backward compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 16403
diff changeset
187 del = " \f\n\r\t\v";
16403
1de4ec2a856d Matlab compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 15521
diff changeset
188 else
1de4ec2a856d Matlab compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 15521
diff changeset
189 del = "\\s";
1de4ec2a856d Matlab compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 15521
diff changeset
190 endif
1de4ec2a856d Matlab compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 15521
diff changeset
191 endif
1de4ec2a856d Matlab compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 15521
diff changeset
192
1de4ec2a856d Matlab compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 15521
diff changeset
193 if (nargin < 1)
1de4ec2a856d Matlab compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 15521
diff changeset
194 print_usage ();
1de4ec2a856d Matlab compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 15521
diff changeset
195 elseif (! ischar (str) || (! ischar (del) && ! iscellstr (del)))
1de4ec2a856d Matlab compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 15521
diff changeset
196 error ("strsplit: S and DEL must be string values");
1de4ec2a856d Matlab compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 15521
diff changeset
197 elseif (! isscalar (args.collapsedelimiters))
1de4ec2a856d Matlab compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 15521
diff changeset
198 error ("strsplit: COLLAPSEDELIMITERS must be a scalar value");
1de4ec2a856d Matlab compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 15521
diff changeset
199 endif
1de4ec2a856d Matlab compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 15521
diff changeset
200
1de4ec2a856d Matlab compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 15521
diff changeset
201 if (strncmpi (args.delimitertype, "simple", length_deltype))
1de4ec2a856d Matlab compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 15521
diff changeset
202 if (iscellstr (del))
1de4ec2a856d Matlab compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 15521
diff changeset
203 del = cellfun (@(x) regexp2simple (x, false), del, "uniformoutput",
1de4ec2a856d Matlab compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 15521
diff changeset
204 false);
1de4ec2a856d Matlab compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 15521
diff changeset
205 else
1de4ec2a856d Matlab compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 15521
diff changeset
206 del = regexp2simple (del, false);
1de4ec2a856d Matlab compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 15521
diff changeset
207 endif
8877
2c8b2399247b implement strsplit; deprecate split
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parents:
diff changeset
208 endif
2c8b2399247b implement strsplit; deprecate split
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
209
16411
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diff changeset
210 if (rows (str) > 1)
5be43435bd5b Improve speed and backward compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 16403
diff changeset
211 tmp = char (del(1));
5be43435bd5b Improve speed and backward compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 16403
diff changeset
212 str = [str, repmat(tmp,rows(str),1)];
5be43435bd5b Improve speed and backward compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 16403
diff changeset
213 str = reshape (str.', 1, numel (str));
5be43435bd5b Improve speed and backward compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 16403
diff changeset
214 str(end-numel(tmp)+1:end) = [];
5be43435bd5b Improve speed and backward compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 16403
diff changeset
215 endif
5be43435bd5b Improve speed and backward compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 16403
diff changeset
216
16403
1de4ec2a856d Matlab compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 15521
diff changeset
217 if (isempty (str))
1de4ec2a856d Matlab compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 15521
diff changeset
218 result = {str};
16411
5be43435bd5b Improve speed and backward compatibility for strsplit()
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diff changeset
219 elseif (strncmpi (args.delimitertype, "legacy", length_deltype))
5be43435bd5b Improve speed and backward compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 16403
diff changeset
220 ## Conventional splitting is preserved for its speed. Its delimiter type
5be43435bd5b Improve speed and backward compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 16403
diff changeset
221 ##
5be43435bd5b Improve speed and backward compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 16403
diff changeset
222 if (! ischar (del))
5be43435bd5b Improve speed and backward compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 16403
diff changeset
223 if (iscell (del) && all (cellfun (@numel, del) < 2))
5be43435bd5b Improve speed and backward compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 16403
diff changeset
224 del = [del{:}];
5be43435bd5b Improve speed and backward compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 16403
diff changeset
225 else
5be43435bd5b Improve speed and backward compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 16403
diff changeset
226 error ("strsplit:legacy_delimiter_must_be_char",
5be43435bd5b Improve speed and backward compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 16403
diff changeset
227 "%s %s", "strsplit: for DELIMITERTYPE = ""legacy"" ",
5be43435bd5b Improve speed and backward compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 16403
diff changeset
228 "DEL must be a string, or a cell array scalar character elements.")
5be43435bd5b Improve speed and backward compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 16403
diff changeset
229 endif
5be43435bd5b Improve speed and backward compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 16403
diff changeset
230 endif
5be43435bd5b Improve speed and backward compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 16403
diff changeset
231 ## Split s according to delimiter
5be43435bd5b Improve speed and backward compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 16403
diff changeset
232 if (isscalar (del))
5be43435bd5b Improve speed and backward compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 16403
diff changeset
233 ## Single separator
5be43435bd5b Improve speed and backward compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 16403
diff changeset
234 idx = find (str == del);
5be43435bd5b Improve speed and backward compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 16403
diff changeset
235 else
5be43435bd5b Improve speed and backward compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 16403
diff changeset
236 ## Multiple separators
5be43435bd5b Improve speed and backward compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 16403
diff changeset
237 idx = strchr (str, del);
5be43435bd5b Improve speed and backward compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 16403
diff changeset
238 endif
5be43435bd5b Improve speed and backward compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 16403
diff changeset
239
5be43435bd5b Improve speed and backward compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 16403
diff changeset
240 ## Get substring lengths.
5be43435bd5b Improve speed and backward compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 16403
diff changeset
241 if (isempty (idx))
5be43435bd5b Improve speed and backward compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 16403
diff changeset
242 strlens = length (str);
5be43435bd5b Improve speed and backward compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 16403
diff changeset
243 else
5be43435bd5b Improve speed and backward compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 16403
diff changeset
244 strlens = [idx(1)-1, diff(idx)-1, numel(str)-idx(end)];
5be43435bd5b Improve speed and backward compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 16403
diff changeset
245 endif
5be43435bd5b Improve speed and backward compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 16403
diff changeset
246 if (nargout > 1)
5be43435bd5b Improve speed and backward compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 16403
diff changeset
247 ## Grab the separators
5be43435bd5b Improve speed and backward compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 16403
diff changeset
248 matches = num2cell (str(idx)(:)).';
5be43435bd5b Improve speed and backward compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 16403
diff changeset
249 endif
5be43435bd5b Improve speed and backward compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 16403
diff changeset
250 ## Remove separators.
5be43435bd5b Improve speed and backward compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 16403
diff changeset
251 str(idx) = [];
5be43435bd5b Improve speed and backward compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 16403
diff changeset
252 if (args.collapsedelimiters)
5be43435bd5b Improve speed and backward compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 16403
diff changeset
253 ## Omit zero lengths.
5be43435bd5b Improve speed and backward compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 16403
diff changeset
254 strlens = strlens(strlens != 0);
5be43435bd5b Improve speed and backward compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 16403
diff changeset
255 endif
5be43435bd5b Improve speed and backward compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 16403
diff changeset
256
5be43435bd5b Improve speed and backward compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 16403
diff changeset
257 ## Convert!
5be43435bd5b Improve speed and backward compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 16403
diff changeset
258 result = mat2cell (str, 1, strlens);
16403
1de4ec2a856d Matlab compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 15521
diff changeset
259 elseif (strncmpi (args.delimitertype, "regularexpression", length_deltype)
1de4ec2a856d Matlab compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 15521
diff changeset
260 || strncmpi (args.delimitertype, "simple", length_deltype))
1de4ec2a856d Matlab compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 15521
diff changeset
261 if (iscellstr (del))
1de4ec2a856d Matlab compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 15521
diff changeset
262 del = sprintf ('%s|', del{:});
1de4ec2a856d Matlab compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 15521
diff changeset
263 del(end) = [];
13701
46e68badedb8 strsplit.m: Expand to accept 2-D character arrays. Improve input validation.
Rik <octave@nomad.inbox5.com>
parents: 12915
diff changeset
264 endif
16403
1de4ec2a856d Matlab compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 15521
diff changeset
265 [result, ~, ~, ~, matches] = regexp (str, del, "split");
1de4ec2a856d Matlab compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 15521
diff changeset
266 if (args.collapsedelimiters)
1de4ec2a856d Matlab compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 15521
diff changeset
267 result(cellfun (@isempty, result)) = [];
1de4ec2a856d Matlab compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 15521
diff changeset
268 endif
1de4ec2a856d Matlab compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 15521
diff changeset
269 if (strncmpi (args.delimitertype, "simple", length_deltype))
1de4ec2a856d Matlab compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 15521
diff changeset
270 matches = cellfun (@(x) regexp2simple (x, true), matches,
1de4ec2a856d Matlab compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 15521
diff changeset
271 "uniformoutput", false);
8877
2c8b2399247b implement strsplit; deprecate split
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
272 endif
16403
1de4ec2a856d Matlab compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 15521
diff changeset
273 else
1de4ec2a856d Matlab compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 15521
diff changeset
274 error ("strsplit:invalid_delimitertype",
1de4ec2a856d Matlab compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 15521
diff changeset
275 sprintf ("strsplit: Invalid DELIMITERTYPE"))
1de4ec2a856d Matlab compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 15521
diff changeset
276 endif
1de4ec2a856d Matlab compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 15521
diff changeset
277 endfunction
8877
2c8b2399247b implement strsplit; deprecate split
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
278
16403
1de4ec2a856d Matlab compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 15521
diff changeset
279 function str = regexp2simple (str, reverse = false)
1de4ec2a856d Matlab compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 15521
diff changeset
280 rep = {'\', '[', ']', '{', '}', '$', '^', '(', ')', '*', '+', '.', '?', '|'};
1de4ec2a856d Matlab compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 15521
diff changeset
281 if (reverse)
1de4ec2a856d Matlab compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 15521
diff changeset
282 ## backslash must go last
1de4ec2a856d Matlab compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 15521
diff changeset
283 for r = numel(rep):-1:1
1de4ec2a856d Matlab compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 15521
diff changeset
284 str = strrep (str, [char(92), rep{r}], rep{r});
1de4ec2a856d Matlab compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 15521
diff changeset
285 endfor
1de4ec2a856d Matlab compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 15521
diff changeset
286 else
1de4ec2a856d Matlab compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 15521
diff changeset
287 ## backslash must go first
1de4ec2a856d Matlab compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 15521
diff changeset
288 for r = 1:numel(rep)
1de4ec2a856d Matlab compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 15521
diff changeset
289 str = strrep (str, rep{r}, [char(92), rep{r}]);
1de4ec2a856d Matlab compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 15521
diff changeset
290 endfor
8877
2c8b2399247b implement strsplit; deprecate split
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
291 endif
2c8b2399247b implement strsplit; deprecate split
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
292 endfunction
2c8b2399247b implement strsplit; deprecate split
Jaroslav Hajek <highegg@gmail.com>
parents:
diff changeset
293
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294 % Mimic the old strsplit()
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295 %!assert (cellfun (@numel, strsplit (["a,b,c";"1,2 "], ",")), [1 1 2 1 4])
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296
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297 %!shared str
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298 %! str = "The rain in Spain stays mainly in the plain.";
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299 % Split on all whitespace.
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300 %!assert (strsplit (str), {"The", "rain", "in", "Spain", "stays", ...
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301 %! "mainly", "in", "the", "plain."})
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302 % Split on "ain".
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303 %!assert (strsplit (str, "ain"), {"The r", " in Sp", " stays m", ...
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304 %! "ly in the pl", "."})
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305 % Split on " " and "ain" (treating multiple delimiters as one).
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306 %!test
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307 %! s = strsplit (str, '\s|ain', true, "delimitertype", "r");
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308 %! assert (s, {"The", "r", "in", "Sp", "stays", "m", "ly", "in", "the", "pl", "."})
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309 %!test
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310 %! s = strsplit (str, "\\s|ain", true, "delimitertype", "r");
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311 %! assert (s, {"The", "r", "in", "Sp", "stays", "m", "ly", "in", "the", "pl", "."})
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312 %!test
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313 %! [s, m] = strsplit (str, {"\\s", "ain"}, true, "delimitertype", "r");
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314 %! assert (s, {"The", "r", "in", "Sp", "stays", "m", "ly", "in", "the", "pl", "."})
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315 %! assert (m, {" ", "ain", " ", " ", "ain", " ", " ", "ain", " ", " ", " ", "ain"})
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316 % Split on " " and "ain", and treat multiple delimiters separately.
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317 %!test
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318 %! [s, m] = strsplit (str, {" ", "ain"}, "collapsedelimiters", false);
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319 %! assert (s, {"The", "r", "", "in", "Sp", "", "stays", "m", "ly", "in", "the", "pl", "."})
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320 %! assert (m, {" ", "ain", " ", " ", "ain", " ", " ", "ain", " ", " ", " ", "ain"})
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321
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322 %!assert (strsplit ("road to hell"), {"road", "to", "hell"})
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323 %!assert (strsplit ("road to hell", " "), {"road", "to", "hell"})
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324 %!assert (strsplit ("road to^hell", {" ","^"}), {"road", "to", "hell"})
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325 %!assert (strsplit ("road to--hell", {" ","-"}, true), {"road", "to", "hell"})
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326 %!assert (strsplit (["a,bc,,de"], ",", false, "delimitertype", "s"), {"a", "bc", "", "de"})
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327 %!assert (strsplit (["a,bc,,de"], ",", false), {"a", "bc", char(ones(1,0)), "de"})
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328 %!assert (strsplit (["a,bc,de"], ",", true), {"a", "bc", "de"})
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329 %!assert (strsplit (["a,bc,de"], {","," "}, true), {"a", "bc", "de"})
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330 %!test
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331 %! [s, m] = strsplit ("hello \t world", 1);
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332 %! assert (s, {"hello", "world"});
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333 %! assert (m, {" ", "\t", " "});
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334
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335 %!assert (strsplit ("road to hell", " ", "delimitertype", "r"), {"road", "to", "hell"})
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336 %!assert (strsplit ("road to^hell", '\^| ', "delimitertype", "r"), {"road", "to", "hell"})
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337 %!assert (strsplit ("road to^hell", "[ ^]", "delimitertype", "r"), {"road", "to", "hell"})
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338 %!assert (strsplit ("road to--hell", "[ -]", false, "delimitertype", "r"), {"road", "", "", "to", "", "hell"})
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339 %!assert (strsplit (["a,bc,de"], ",", "delimitertype", "r"), {"a", "bc", "de"})
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340 %!assert (strsplit (["a,bc,,de"], ",", false, "delimitertype", "r"), {"a", "bc", "", "de"})
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341 %!assert (strsplit (["a,bc,de"], ",", true, "delimitertype", "r"), {"a", "bc", "de"})
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342 %!assert (strsplit (["a,bc,de"], "[, ]", true, "delimitertype", "r"), {"a", "bc", "de"})
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343 %!assert (strsplit ("hello \t world", 1, "delimitertype", "r"), {"hello", "world"});
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344
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345 %!assert (strsplit ("road to hell", " ", false, "delimitertype", "l"), {"road", "to", "hell"})
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346 %!assert (strsplit ("road to^hell", " ^", false, "delimitertype", "l"), {"road", "to", "hell"})
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347 %!assert (strsplit ("road to--hell", " -", true, "delimitertype", "l"), {"road", "to", "hell"})
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348 %!assert (strsplit (["a,bc";",de"], ",", false, "delimitertype", "l"), {"a", "bc", char(ones(1,0)), "de "})
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349 %!assert (strsplit (["a,bc";",de"], ",", true, "delimitertype", "l"), {"a", "bc", "de "})
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350 %!assert (strsplit (["a,bc";",de"], ", ", true, "delimitertype", "l"), {"a", "bc", "de"})
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351
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352 %% Test input validation
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353 %!error strsplit ()
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354 %!error strsplit ("abc", "b", true, 4)
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355 %!error <S and DEL must be string values> strsplit (123, "b")
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356 %!error <COLLAPSEDELIMITERS must be a scalar value> strsplit ("abc", "def", ones (3,3))
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357