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annotate scripts/io/textscan.m @ 14214:2fe0f5fa8cc3

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Replace to-be-deprecated findstr occurrences with strfind. * help.m, textread.m, textscan.m, pkg.m, legend.m, __ezplot__.m, __go_draw_axes__.m, rundemos.m: Replace to-be-deprecated findstr occurrences with strfind.
author Rik <octave@nomad.inbox5.com>
date Wed, 18 Jan 2012 21:15:42 -0800
parents a022c04f68cc
children f3d52523cde1
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 ## Copyright (C) 2010-2012 Ben Abbott <bpabbott@mac.com>
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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{C} =} textscan (@var{fid}, @var{format})
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21 ## @deftypefnx {Function File} {@var{C} =} textscan (@var{fid}, @var{format}, @var{n})
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22 ## @deftypefnx {Function File} {@var{C} =} textscan (@var{fid}, @var{format}, @var{param}, @var{value}, @dots{})
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23 ## @deftypefnx {Function File} {@var{C} =} textscan (@var{fid}, @var{format}, @var{n}, @var{param}, @var{value}, @dots{})
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24 ## @deftypefnx {Function File} {@var{C} =} textscan (@var{str}, @dots{})
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25 ## @deftypefnx {Function File} {[@var{C}, @var{position}] =} textscan (@var{fid}, @dots{})
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26 ## Read data from a text file or string.
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27 ##
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28 ## The file associated with @var{fid} is read and parsed according to
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29 ## @var{format}. The function behaves like @code{strread} except it works by
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30 ## parsing a file instead of a string. See the documentation of
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31 ## @code{strread} for details.
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32 ##
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33 ## In addition to the options supported by
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34 ## @code{strread}, this function supports a few more:
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35 ##
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36 ## @itemize
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37 ## @item "collectoutput":
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38 ## A value of 1 or true instructs textscan to concatenate consecutive columns
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39 ## of the same class in the output cell array. A value of 0 or false (default)
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40 ## leaves output in distinct columns.
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41 ##
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42 ## @item "endofline":
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43 ## Specify "\r", "\n" or "\r\n" (for CR, LF, or CRLF). If no value is given,
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44 ## it will be inferred from the file. If set to "" (empty string) EOLs are
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45 ## ignored as delimiters and added to whitespace.
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46 ##
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47 ## @item "headerlines":
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48 ## The first @var{value} number of lines of @var{fid} are skipped.
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49 ##
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50 ## @item "returnonerror":
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51 ## If set to numerical 1 or true (default), return normally when read errors
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52 ## have been encountered. If set to 0 or false, return an error and no data.
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53 ## @end itemize
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54 ##
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55 ## The optional input @var{n} specifes the number of times to use
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56 ## @var{format} when parsing, i.e., the format repeat count.
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57 ##
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58 ## The output @var{C} is a cell array whose length is given by the number
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59 ## of format specifiers.
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60 ##
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61 ## The second output, @var{position}, provides the position, in characters,
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62 ## from the beginning of the file.
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63 ##
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64 ## @seealso{dlmread, fscanf, load, strread, textread}
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65 ## @end deftypefn
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66
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67 function [C, position] = textscan (fid, format = "%f", varargin)
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68
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69 ## Check input
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70 if (nargin < 1)
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71 print_usage ();
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72 endif
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73
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74 if (isempty (format))
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75 format = "%f";
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76 endif
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77
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78 if (! (isa (fid, "double") && fid > 0) && ! ischar (fid))
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79 error ("textscan: first argument must be a file id or character string");
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80 endif
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81
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82 if (! ischar (format))
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83 error ("textscan: FORMAT must be a string");
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84 endif
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85
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86 args = varargin;
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87 if (nargin > 2 && isnumeric (args{1}))
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88 nlines = args{1};
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89 else
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90 nlines = Inf;
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91 endif
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92
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93 if (! any (strcmpi (args, "emptyvalue")))
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94 ## Matlab returns NaNs for missing values
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95 args(end+1:end+2) = {'emptyvalue', NaN};
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96 endif
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97
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98 ## Check default parameter values that differ for strread & textread
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99
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100 ipos = find (strcmpi (args, "whitespace"));
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101 if (isempty (ipos))
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102 ## Matlab default whitespace = " \b\t"
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103 args(end+1:end+2) = {'whitespace', " \b\t"};
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104 whitespace = " \b\t";
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105 else
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106 ## Check if there's at least one string format specifier
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107 has_str_fmt = regexp (format, '%[*]?\d*s', "once");
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108 ## If there is a string format AND whitespace value = empty,
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109 ## don't add a space (char(32)) to whitespace
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110 if (! (isempty (args{ipos+1}) && has_str_fmt))
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111 args{ipos+1} = unique ([" ", args{ipos+1}]);
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112 endif
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113 endif
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114
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115 if (! any (strcmpi (args, "delimiter")))
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116 ## Matlab says default delimiter = whitespace.
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117 ## strread() will pick this up further
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118 args(end+1:end+2) = {'delimiter', ""};
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119 endif
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120
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121 collop = false;
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122 ipos = find (strcmpi (args, "collectoutput"));
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123 if (! isempty (ipos))
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124 ## Search & concatenate consecutive columns of same class requested
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125 if (isscalar (args{ipos+1})
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126 && (islogical (args{ipos+1}) || isnumeric (args{ipos+1})))
ac00ae83ea2e More compatibility improvements for textscan and strread
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parents: 12891
diff changeset
127 collop = args{ipos+1};
ac00ae83ea2e More compatibility improvements for textscan and strread
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parents: 12891
diff changeset
128 else
ac00ae83ea2e More compatibility improvements for textscan and strread
Philip Nienhuis <prnienhuis@users.sf.net>
parents: 12891
diff changeset
129 warning ("textscan: illegal value for CollectOutput parameter - ignored");
ac00ae83ea2e More compatibility improvements for textscan and strread
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parents: 12891
diff changeset
130 endif
ac00ae83ea2e More compatibility improvements for textscan and strread
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parents: 12891
diff changeset
131 ## Remove argument before call to strread() below
ac00ae83ea2e More compatibility improvements for textscan and strread
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parents: 12891
diff changeset
132 args(ipos:ipos+1) = [];
ac00ae83ea2e More compatibility improvements for textscan and strread
Philip Nienhuis <prnienhuis@users.sf.net>
parents: 12891
diff changeset
133 endif
ac00ae83ea2e More compatibility improvements for textscan and strread
Philip Nienhuis <prnienhuis@users.sf.net>
parents: 12891
diff changeset
134
12866
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diff changeset
135 if (any (strcmpi (args, "returnonerror")))
fe6e2afcd9ee Revamp strread, textscan, textread functions for Matlab compatability
Philip Nienhuis <prnienhuis@users.sf.net>
parents: 12679
diff changeset
136 ## Because of the way strread() reads data (columnwise) this parameter
fe6e2afcd9ee Revamp strread, textscan, textread functions for Matlab compatability
Philip Nienhuis <prnienhuis@users.sf.net>
parents: 12679
diff changeset
137 ## can't be neatly implemented. strread() will pick it up anyway
12877
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parents: 12873
diff changeset
138 warning ('textscan: ReturnOnError is not fully implemented');
12866
fe6e2afcd9ee Revamp strread, textscan, textread functions for Matlab compatability
Philip Nienhuis <prnienhuis@users.sf.net>
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diff changeset
139 else
fe6e2afcd9ee Revamp strread, textscan, textread functions for Matlab compatability
Philip Nienhuis <prnienhuis@users.sf.net>
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diff changeset
140 ## Set default value (=true)
12877
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diff changeset
141 args(end+1:end+2) = {"returnonerror", 1};
12866
fe6e2afcd9ee Revamp strread, textscan, textread functions for Matlab compatability
Philip Nienhuis <prnienhuis@users.sf.net>
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diff changeset
142 endif
fe6e2afcd9ee Revamp strread, textscan, textread functions for Matlab compatability
Philip Nienhuis <prnienhuis@users.sf.net>
parents: 12679
diff changeset
143
fe6e2afcd9ee Revamp strread, textscan, textread functions for Matlab compatability
Philip Nienhuis <prnienhuis@users.sf.net>
parents: 12679
diff changeset
144 if (ischar (fid))
fe6e2afcd9ee Revamp strread, textscan, textread functions for Matlab compatability
Philip Nienhuis <prnienhuis@users.sf.net>
parents: 12679
diff changeset
145 ## Read from a text string
fe6e2afcd9ee Revamp strread, textscan, textread functions for Matlab compatability
Philip Nienhuis <prnienhuis@users.sf.net>
parents: 12679
diff changeset
146 if (nargout == 2)
fe6e2afcd9ee Revamp strread, textscan, textread functions for Matlab compatability
Philip Nienhuis <prnienhuis@users.sf.net>
parents: 12679
diff changeset
147 error ("textscan: cannot provide position information for character input");
fe6e2afcd9ee Revamp strread, textscan, textread functions for Matlab compatability
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parents: 12679
diff changeset
148 endif
fe6e2afcd9ee Revamp strread, textscan, textread functions for Matlab compatability
Philip Nienhuis <prnienhuis@users.sf.net>
parents: 12679
diff changeset
149 str = fid;
fe6e2afcd9ee Revamp strread, textscan, textread functions for Matlab compatability
Philip Nienhuis <prnienhuis@users.sf.net>
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diff changeset
150 else
fe6e2afcd9ee Revamp strread, textscan, textread functions for Matlab compatability
Philip Nienhuis <prnienhuis@users.sf.net>
parents: 12679
diff changeset
151 ## Skip header lines if requested
fe6e2afcd9ee Revamp strread, textscan, textread functions for Matlab compatability
Philip Nienhuis <prnienhuis@users.sf.net>
parents: 12679
diff changeset
152 headerlines = find (strcmpi (args, "headerlines"), 1);
fe6e2afcd9ee Revamp strread, textscan, textread functions for Matlab compatability
Philip Nienhuis <prnienhuis@users.sf.net>
parents: 12679
diff changeset
153 ## Beware of zero valued headerline, fskipl would skip to EOF
fe6e2afcd9ee Revamp strread, textscan, textread functions for Matlab compatability
Philip Nienhuis <prnienhuis@users.sf.net>
parents: 12679
diff changeset
154 if (! isempty (headerlines) && (args{headerlines + 1} > 0))
fe6e2afcd9ee Revamp strread, textscan, textread functions for Matlab compatability
Philip Nienhuis <prnienhuis@users.sf.net>
parents: 12679
diff changeset
155 fskipl (fid, varargin{headerlines + 1});
13141
e81ddf9cacd5 maint: untabify and remove trailing whitespace from source files
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parents: 12916
diff changeset
156 args(headerlines:headerlines+1) = [];
12866
fe6e2afcd9ee Revamp strread, textscan, textread functions for Matlab compatability
Philip Nienhuis <prnienhuis@users.sf.net>
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diff changeset
157 endif
12880
ff264eae88cf textread.m, textscan.m: Read entire file when format repeat count is -1
Rik <octave@nomad.inbox5.com>
parents: 12877
diff changeset
158 if (isfinite (nlines) && (nlines >= 0))
12877
ddea3962b024 Various improvements to strread, textread, textscan functions
Rik <octave@nomad.inbox5.com>
parents: 12873
diff changeset
159 str = tmp_str = "";
ddea3962b024 Various improvements to strread, textread, textscan functions
Rik <octave@nomad.inbox5.com>
parents: 12873
diff changeset
160 n = 0;
ddea3962b024 Various improvements to strread, textread, textscan functions
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parents: 12873
diff changeset
161 ## FIXME: Can this be done without slow loop?
12916
5d0478a75618 textscan: Fix multiple accesses, bug #33876.
Ben Abbott <bpabbott@mac.com>
parents: 12914
diff changeset
162 while (ischar (tmp_str) && n++ < nlines)
12877
ddea3962b024 Various improvements to strread, textread, textscan functions
Rik <octave@nomad.inbox5.com>
parents: 12873
diff changeset
163 tmp_str = fgets (fid);
12916
5d0478a75618 textscan: Fix multiple accesses, bug #33876.
Ben Abbott <bpabbott@mac.com>
parents: 12914
diff changeset
164 if (ischar (tmp_str))
5d0478a75618 textscan: Fix multiple accesses, bug #33876.
Ben Abbott <bpabbott@mac.com>
parents: 12914
diff changeset
165 str = strcat (str, tmp_str);
5d0478a75618 textscan: Fix multiple accesses, bug #33876.
Ben Abbott <bpabbott@mac.com>
parents: 12914
diff changeset
166 endif
12877
ddea3962b024 Various improvements to strread, textread, textscan functions
Rik <octave@nomad.inbox5.com>
parents: 12873
diff changeset
167 endwhile
12866
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Philip Nienhuis <prnienhuis@users.sf.net>
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diff changeset
168 else
fe6e2afcd9ee Revamp strread, textscan, textread functions for Matlab compatability
Philip Nienhuis <prnienhuis@users.sf.net>
parents: 12679
diff changeset
169 str = fread (fid, "char=>char").';
fe6e2afcd9ee Revamp strread, textscan, textread functions for Matlab compatability
Philip Nienhuis <prnienhuis@users.sf.net>
parents: 12679
diff changeset
170 endif
fe6e2afcd9ee Revamp strread, textscan, textread functions for Matlab compatability
Philip Nienhuis <prnienhuis@users.sf.net>
parents: 12679
diff changeset
171 endif
fe6e2afcd9ee Revamp strread, textscan, textread functions for Matlab compatability
Philip Nienhuis <prnienhuis@users.sf.net>
parents: 12679
diff changeset
172
fe6e2afcd9ee Revamp strread, textscan, textread functions for Matlab compatability
Philip Nienhuis <prnienhuis@users.sf.net>
parents: 12679
diff changeset
173 ## Check for empty result
fe6e2afcd9ee Revamp strread, textscan, textread functions for Matlab compatability
Philip Nienhuis <prnienhuis@users.sf.net>
parents: 12679
diff changeset
174 if (isempty (str))
fe6e2afcd9ee Revamp strread, textscan, textread functions for Matlab compatability
Philip Nienhuis <prnienhuis@users.sf.net>
parents: 12679
diff changeset
175 warning ("textscan: no data read");
fe6e2afcd9ee Revamp strread, textscan, textread functions for Matlab compatability
Philip Nienhuis <prnienhuis@users.sf.net>
parents: 12679
diff changeset
176 C = [];
12877
ddea3962b024 Various improvements to strread, textread, textscan functions
Rik <octave@nomad.inbox5.com>
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diff changeset
177 return;
ddea3962b024 Various improvements to strread, textread, textscan functions
Rik <octave@nomad.inbox5.com>
parents: 12873
diff changeset
178 endif
ddea3962b024 Various improvements to strread, textread, textscan functions
Rik <octave@nomad.inbox5.com>
parents: 12873
diff changeset
179
ddea3962b024 Various improvements to strread, textread, textscan functions
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parents: 12873
diff changeset
180 ## Check value of 'endofline'. String or file doesn't seem to matter
ddea3962b024 Various improvements to strread, textread, textscan functions
Rik <octave@nomad.inbox5.com>
parents: 12873
diff changeset
181 endofline = find (strcmpi (args, "endofline"), 1);
ddea3962b024 Various improvements to strread, textread, textscan functions
Rik <octave@nomad.inbox5.com>
parents: 12873
diff changeset
182 if (! isempty (endofline))
13141
e81ddf9cacd5 maint: untabify and remove trailing whitespace from source files
John W. Eaton <jwe@octave.org>
parents: 12916
diff changeset
183 if (ischar (args{endofline + 1}))
12877
ddea3962b024 Various improvements to strread, textread, textscan functions
Rik <octave@nomad.inbox5.com>
parents: 12873
diff changeset
184 eol_char = args{endofline + 1};
14213
a022c04f68cc Replace to-be-deprecated strmatch occurrences with alternate code.
Rik <octave@nomad.inbox5.com>
parents: 14138
diff changeset
185 if (! any (strcmp (eol_char, {"", "\n", "\r", "\r\n"})))
12914
ac00ae83ea2e More compatibility improvements for textscan and strread
Philip Nienhuis <prnienhuis@users.sf.net>
parents: 12891
diff changeset
186 error ("textscan: illegal EndOfLine character value specified");
ac00ae83ea2e More compatibility improvements for textscan and strread
Philip Nienhuis <prnienhuis@users.sf.net>
parents: 12891
diff changeset
187 endif
12866
fe6e2afcd9ee Revamp strread, textscan, textread functions for Matlab compatability
Philip Nienhuis <prnienhuis@users.sf.net>
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diff changeset
188 else
13141
e81ddf9cacd5 maint: untabify and remove trailing whitespace from source files
John W. Eaton <jwe@octave.org>
parents: 12916
diff changeset
189 error ("textscan: character value required for EndOfLine");
12866
fe6e2afcd9ee Revamp strread, textscan, textread functions for Matlab compatability
Philip Nienhuis <prnienhuis@users.sf.net>
parents: 12679
diff changeset
190 endif
12877
ddea3962b024 Various improvements to strread, textread, textscan functions
Rik <octave@nomad.inbox5.com>
parents: 12873
diff changeset
191 else
ddea3962b024 Various improvements to strread, textread, textscan functions
Rik <octave@nomad.inbox5.com>
parents: 12873
diff changeset
192 ## Determine EOL from file. Search for EOL candidates in first 3000 chars
ddea3962b024 Various improvements to strread, textread, textscan functions
Rik <octave@nomad.inbox5.com>
parents: 12873
diff changeset
193 eol_srch_len = min (length (str), 3000);
ddea3962b024 Various improvements to strread, textread, textscan functions
Rik <octave@nomad.inbox5.com>
parents: 12873
diff changeset
194 ## First try DOS (CRLF)
14214
2fe0f5fa8cc3 Replace to-be-deprecated findstr occurrences with strfind.
Rik <octave@nomad.inbox5.com>
parents: 14213
diff changeset
195 if (! isempty (strfind ("\r\n", str(1 : eol_srch_len))))
12877
ddea3962b024 Various improvements to strread, textread, textscan functions
Rik <octave@nomad.inbox5.com>
parents: 12873
diff changeset
196 eol_char = "\r\n";
ddea3962b024 Various improvements to strread, textread, textscan functions
Rik <octave@nomad.inbox5.com>
parents: 12873
diff changeset
197 ## Perhaps old Macintosh? (CR)
14214
2fe0f5fa8cc3 Replace to-be-deprecated findstr occurrences with strfind.
Rik <octave@nomad.inbox5.com>
parents: 14213
diff changeset
198 elseif (! isempty (strfind ("\r", str(1 : eol_srch_len))))
12877
ddea3962b024 Various improvements to strread, textread, textscan functions
Rik <octave@nomad.inbox5.com>
parents: 12873
diff changeset
199 eol_char = "\r";
ddea3962b024 Various improvements to strread, textread, textscan functions
Rik <octave@nomad.inbox5.com>
parents: 12873
diff changeset
200 ## Otherwise, use plain UNIX (LF)
ddea3962b024 Various improvements to strread, textread, textscan functions
Rik <octave@nomad.inbox5.com>
parents: 12873
diff changeset
201 else
ddea3962b024 Various improvements to strread, textread, textscan functions
Rik <octave@nomad.inbox5.com>
parents: 12873
diff changeset
202 eol_char = "\n";
ddea3962b024 Various improvements to strread, textread, textscan functions
Rik <octave@nomad.inbox5.com>
parents: 12873
diff changeset
203 endif
ddea3962b024 Various improvements to strread, textread, textscan functions
Rik <octave@nomad.inbox5.com>
parents: 12873
diff changeset
204 ## Set up the default endofline param value
ddea3962b024 Various improvements to strread, textread, textscan functions
Rik <octave@nomad.inbox5.com>
parents: 12873
diff changeset
205 args(end+1:end+2) = {'endofline', eol_char};
ddea3962b024 Various improvements to strread, textread, textscan functions
Rik <octave@nomad.inbox5.com>
parents: 12873
diff changeset
206 endif
12866
fe6e2afcd9ee Revamp strread, textscan, textread functions for Matlab compatability
Philip Nienhuis <prnienhuis@users.sf.net>
parents: 12679
diff changeset
207
12877
ddea3962b024 Various improvements to strread, textread, textscan functions
Rik <octave@nomad.inbox5.com>
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diff changeset
208 ## Determine the number of data fields
ddea3962b024 Various improvements to strread, textread, textscan functions
Rik <octave@nomad.inbox5.com>
parents: 12873
diff changeset
209 num_fields = numel (strfind (format, "%")) - numel (strfind (format, "%*"));
11141
224c80da37c5 textscan.m: Add new function.
Ben Abbott <bpabbott@mac.com>
parents:
diff changeset
210
12877
ddea3962b024 Various improvements to strread, textread, textscan functions
Rik <octave@nomad.inbox5.com>
parents: 12873
diff changeset
211 ## Strip trailing EOL to avoid returning stray missing values (f. strread)
ddea3962b024 Various improvements to strread, textread, textscan functions
Rik <octave@nomad.inbox5.com>
parents: 12873
diff changeset
212 if (strcmp (str(end-length (eol_char) + 1 : end), eol_char));
ddea3962b024 Various improvements to strread, textread, textscan functions
Rik <octave@nomad.inbox5.com>
parents: 12873
diff changeset
213 str(end-length (eol_char) + 1 : end) = "";
ddea3962b024 Various improvements to strread, textread, textscan functions
Rik <octave@nomad.inbox5.com>
parents: 12873
diff changeset
214 endif
11141
224c80da37c5 textscan.m: Add new function.
Ben Abbott <bpabbott@mac.com>
parents:
diff changeset
215
12877
ddea3962b024 Various improvements to strread, textread, textscan functions
Rik <octave@nomad.inbox5.com>
parents: 12873
diff changeset
216 ## Call strread to make it do the real work
ddea3962b024 Various improvements to strread, textread, textscan functions
Rik <octave@nomad.inbox5.com>
parents: 12873
diff changeset
217 C = cell (1, num_fields);
ddea3962b024 Various improvements to strread, textread, textscan functions
Rik <octave@nomad.inbox5.com>
parents: 12873
diff changeset
218 [C{:}] = strread (str, format, args{:});
13141
e81ddf9cacd5 maint: untabify and remove trailing whitespace from source files
John W. Eaton <jwe@octave.org>
parents: 12916
diff changeset
219
12914
ac00ae83ea2e More compatibility improvements for textscan and strread
Philip Nienhuis <prnienhuis@users.sf.net>
parents: 12891
diff changeset
220 ## If requested, collect output columns of same class
ac00ae83ea2e More compatibility improvements for textscan and strread
Philip Nienhuis <prnienhuis@users.sf.net>
parents: 12891
diff changeset
221 if (collop)
ac00ae83ea2e More compatibility improvements for textscan and strread
Philip Nienhuis <prnienhuis@users.sf.net>
parents: 12891
diff changeset
222 C = colloutp (C);
ac00ae83ea2e More compatibility improvements for textscan and strread
Philip Nienhuis <prnienhuis@users.sf.net>
parents: 12891
diff changeset
223 endif
11141
224c80da37c5 textscan.m: Add new function.
Ben Abbott <bpabbott@mac.com>
parents:
diff changeset
224
12877
ddea3962b024 Various improvements to strread, textread, textscan functions
Rik <octave@nomad.inbox5.com>
parents: 12873
diff changeset
225 if (nargout == 2)
ddea3962b024 Various improvements to strread, textread, textscan functions
Rik <octave@nomad.inbox5.com>
parents: 12873
diff changeset
226 position = ftell (fid);
11141
224c80da37c5 textscan.m: Add new function.
Ben Abbott <bpabbott@mac.com>
parents:
diff changeset
227 endif
224c80da37c5 textscan.m: Add new function.
Ben Abbott <bpabbott@mac.com>
parents:
diff changeset
228
224c80da37c5 textscan.m: Add new function.
Ben Abbott <bpabbott@mac.com>
parents:
diff changeset
229 endfunction
224c80da37c5 textscan.m: Add new function.
Ben Abbott <bpabbott@mac.com>
parents:
diff changeset
230
12866
fe6e2afcd9ee Revamp strread, textscan, textread functions for Matlab compatability
Philip Nienhuis <prnienhuis@users.sf.net>
parents: 12679
diff changeset
231
12914
ac00ae83ea2e More compatibility improvements for textscan and strread
Philip Nienhuis <prnienhuis@users.sf.net>
parents: 12891
diff changeset
232 ## Collect consecutive columns of same class into one cell column
ac00ae83ea2e More compatibility improvements for textscan and strread
Philip Nienhuis <prnienhuis@users.sf.net>
parents: 12891
diff changeset
233 function C = colloutp (C)
ac00ae83ea2e More compatibility improvements for textscan and strread
Philip Nienhuis <prnienhuis@users.sf.net>
parents: 12891
diff changeset
234
ac00ae83ea2e More compatibility improvements for textscan and strread
Philip Nienhuis <prnienhuis@users.sf.net>
parents: 12891
diff changeset
235 ## Start at rightmost column and work backwards to avoid ptr mixup
ac00ae83ea2e More compatibility improvements for textscan and strread
Philip Nienhuis <prnienhuis@users.sf.net>
parents: 12891
diff changeset
236 ii = numel (C);
ac00ae83ea2e More compatibility improvements for textscan and strread
Philip Nienhuis <prnienhuis@users.sf.net>
parents: 12891
diff changeset
237 while ii > 1
ac00ae83ea2e More compatibility improvements for textscan and strread
Philip Nienhuis <prnienhuis@users.sf.net>
parents: 12891
diff changeset
238 clss1 = class (C{ii});
ac00ae83ea2e More compatibility improvements for textscan and strread
Philip Nienhuis <prnienhuis@users.sf.net>
parents: 12891
diff changeset
239 jj = ii;
ac00ae83ea2e More compatibility improvements for textscan and strread
Philip Nienhuis <prnienhuis@users.sf.net>
parents: 12891
diff changeset
240 while (jj > 1 && strcmp (clss1, class (C{jj - 1})))
ac00ae83ea2e More compatibility improvements for textscan and strread
Philip Nienhuis <prnienhuis@users.sf.net>
parents: 12891
diff changeset
241 ## Column to the left is still same class; check next column to the left
ac00ae83ea2e More compatibility improvements for textscan and strread
Philip Nienhuis <prnienhuis@users.sf.net>
parents: 12891
diff changeset
242 --jj;
ac00ae83ea2e More compatibility improvements for textscan and strread
Philip Nienhuis <prnienhuis@users.sf.net>
parents: 12891
diff changeset
243 endwhile
ac00ae83ea2e More compatibility improvements for textscan and strread
Philip Nienhuis <prnienhuis@users.sf.net>
parents: 12891
diff changeset
244 if (jj < ii)
ac00ae83ea2e More compatibility improvements for textscan and strread
Philip Nienhuis <prnienhuis@users.sf.net>
parents: 12891
diff changeset
245 ## Concatenate columns into current column
ac00ae83ea2e More compatibility improvements for textscan and strread
Philip Nienhuis <prnienhuis@users.sf.net>
parents: 12891
diff changeset
246 C{jj} = [C{jj : ii}];
ac00ae83ea2e More compatibility improvements for textscan and strread
Philip Nienhuis <prnienhuis@users.sf.net>
parents: 12891
diff changeset
247 ## Wipe concatenated columns to the right, resume search to the left
ac00ae83ea2e More compatibility improvements for textscan and strread
Philip Nienhuis <prnienhuis@users.sf.net>
parents: 12891
diff changeset
248 C(jj+1 : ii) = [];
ac00ae83ea2e More compatibility improvements for textscan and strread
Philip Nienhuis <prnienhuis@users.sf.net>
parents: 12891
diff changeset
249 ii = jj - 1;
ac00ae83ea2e More compatibility improvements for textscan and strread
Philip Nienhuis <prnienhuis@users.sf.net>
parents: 12891
diff changeset
250 else
ac00ae83ea2e More compatibility improvements for textscan and strread
Philip Nienhuis <prnienhuis@users.sf.net>
parents: 12891
diff changeset
251 ## No similar class in column to the left, search from there
ac00ae83ea2e More compatibility improvements for textscan and strread
Philip Nienhuis <prnienhuis@users.sf.net>
parents: 12891
diff changeset
252 --ii;
ac00ae83ea2e More compatibility improvements for textscan and strread
Philip Nienhuis <prnienhuis@users.sf.net>
parents: 12891
diff changeset
253 endif
ac00ae83ea2e More compatibility improvements for textscan and strread
Philip Nienhuis <prnienhuis@users.sf.net>
parents: 12891
diff changeset
254 endwhile
ac00ae83ea2e More compatibility improvements for textscan and strread
Philip Nienhuis <prnienhuis@users.sf.net>
parents: 12891
diff changeset
255
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256 endfunction
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257
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258 %!test
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259 %! str = "1, 2, 3, 4\n 5, , , 8\n 9, 10, 11, 12";
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260 %! fmtstr = "%f %d %f %s";
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261 %! c = textscan (str, fmtstr, 2, "delimiter", ",", "emptyvalue", -Inf);
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262 %! assert (isequal (c{1}, [1;5]));
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263 %! assert (length (c{1}), 2);
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264 %! assert (iscellstr (c{4}));
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265 %! assert (isequal (c{3}, [3; -Inf]));
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266
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267 %!test
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268 %! b = [10:10:100];
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269 %! b = [b; 8*b/5];
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270 %! str = sprintf ("%g miles/hr = %g kilometers/hr\n", b);
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271 %! fmt = "%f miles/hr = %f kilometers/hr";
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272 %! c = textscan (str, fmt);
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273 %! assert (b(1,:)', c{1}, 1e-5);
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274 %! assert (b(2,:)', c{2}, 1e-5);
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275
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276 #%!test
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277 #%! str = "13, 72, NA, str1, 25\r\n// Middle line\r\n36, na, 05, str3, 6";
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278 #%! a = textscan(str, '%d %n %f %s %n', 'delimiter', ',','treatAsEmpty', {'NA', 'na'},'commentStyle', '//');
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279 #%! assert (a{1}, int32([13; 36]));
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280 #%! assert (a{2}, [72; NaN]);
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281 #%! assert (a{3}, [NaN; 5]);
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282 #%! assert (a{4}, {"str1"; "str3"});
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283 #%! assert (a{5}, [25; 6]);
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284
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285 %!test
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286 %! str = "Km:10 = hhhBjjj miles16hour\r\n";
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287 %! str = [str "Km:15 = hhhJjjj miles241hour\r\n"];
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288 %! str = [str "Km:2 = hhhRjjj miles3hour\r\n"];
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289 %! str = [str "Km:25 = hhhZ\r\n"];
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290 %! fmt = "Km:%d = hhh%1sjjj miles%dhour";
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291 %! a = textscan (str, fmt, 'delimiter', ' ');
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292 %! assert (a{1}', int32([10 15 2 25]));
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293 %! assert (a{2}', {'B' 'J' 'R' 'Z'});
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294 %! assert (a{3}', int32([16 241 3 0]));
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295
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296 %% Test with default endofline parameter
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297 %!test
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298 %! c = textscan ("L1\nL2", "%s");
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299 %! assert (c{:}, {"L1"; "L2"});
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300
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301 %% Test with endofline parameter set to '' (empty) - newline should be in word
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302 %!test
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303 %! c = textscan ("L1\nL2", "%s", 'endofline', '');
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304 %! assert (int8(c{:}{:}), int8([ 76, 49, 10, 76, 50 ]));
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305
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306 %!test
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307 %! # No delimiters at all besides EOL. Skip fields, even empty fields
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308 %! str = "Text1Text2Text\nTextText4Text\nText57Text";
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309 %! c = textscan (str, "Text%*dText%dText");
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310 %! assert (c{1}, int32 ([2; 4; 0]));
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311
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312 %!test
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313 %% CollectOutput test
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314 %! b = [10:10:100];
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315 %! b = [b; 8*b/5; 8*b*1000/5];
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316 %! str = sprintf ("%g miles/hr = %g (%g) kilometers (meters)/hr\n", b);
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317 %! fmt = "%f miles%s %s %f (%f) kilometers %*s";
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318 %! c = textscan (str, fmt, 'collectoutput', 1);
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319 %! assert (size(c{3}), [10, 2]);
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320 %! assert (size(c{2}), [10, 2]);
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321
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322 %% Test input validation
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323 %!error textscan ()
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324 %!error textscan (single (4))
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325 %!error textscan ({4})
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326 %!error <must be a string> textscan ("Hello World", 2)
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327 %!error <cannot provide position information> [C, pos] = textscan ("Hello World")
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328 %!error <character value required> textscan ("Hello World", '%s', 'EndOfLine', 3)
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329