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annotate scripts/io/textscan.m @ 14565:98aaebc56d7c

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2012-03-25 Philip Nienhuis <prnienhuis@users.sf.net> * textscan.m, textread.m Updated texinfo header (@var{n} format repeat count section) Replaced slow fgets / str concat section by block reading Supplied varargout in some cases to avoid unneeded errors Improvements to coding style * textscan.m Moved some code upward to avoid having multiple fclose statements
author Philip Nienhuis <prnienhuis@@users.sf.net>
date Fri, 30 Mar 2012 18:44:01 +0200
parents 86854d032a37
children e97ec01d4157
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 ## When reading from a character string, optional input argument @var{n}
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56 ## specifes the number of times @var{format} should be used (i.e., to limit
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57 ## the amount of data read).
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58 ## When reading fro file, @var{n} specifes the number of data lines to read;
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59 ## in this sense it differs slightly from the format repeat count in strread.
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60 ##
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61 ## The output @var{C} is a cell array whose length is given by the number
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62 ## of format specifiers.
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63 ##
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64 ## The second output, @var{position}, provides the position, in characters,
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65 ## from the beginning of the file.
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66 ##
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67 ## @seealso{dlmread, fscanf, load, strread, textread}
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68 ## @end deftypefn
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69
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70 function [C, position] = textscan (fid, format = "%f", varargin)
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71
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72 BUFLENGTH = 4096; ## Read buffer
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73
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74 ## Check input
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75 if (nargin < 1)
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76 print_usage ();
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77 endif
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78
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79 if (isempty (format))
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80 format = "%f";
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81 endif
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82
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83 if (! (isa (fid, "double") && fid > 0) && ! ischar (fid))
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84 error ("textscan: first argument must be a file id or character string");
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85 endif
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86
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87 if (! ischar (format))
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88 error ("textscan: FORMAT must be a string");
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89 endif
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90
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91 args = varargin;
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92 if (nargin > 2 && isnumeric (args{1}))
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93 nlines = args{1};
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94 else
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95 nlines = Inf;
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96 endif
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97 if (nlines < 1)
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98 printf ("textscan: N = 0, no data read\n");
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99 C = [];
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100 return
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101 endif
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102
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103 if (! any (strcmpi (args, "emptyvalue")))
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104 ## Matlab returns NaNs for missing values
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105 args(end+1:end+2) = {'emptyvalue', NaN};
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106 endif
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107
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108 ## Check default parameter values that differ for strread & textread
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109
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110 ipos = find (strcmpi (args, "whitespace"));
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111 if (isempty (ipos))
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112 ## Matlab default whitespace = " \b\t"
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113 args(end+1:end+2) = {'whitespace', " \b\t"};
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114 whitespace = " \b\t";
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115 else
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116 ## Check if there's at least one string format specifier
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117 has_str_fmt = regexp (format, '%[*]?\d*s', "once");
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118 ## If there is a string format AND whitespace value = empty,
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119 ## don't add a space (char(32)) to whitespace
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120 if (! (isempty (args{ipos+1}) && has_str_fmt))
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121 args{ipos+1} = unique ([" ", args{ipos+1}]);
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122 endif
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123 endif
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diff changeset
124
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diff changeset
125 if (! any (strcmpi (args, "delimiter")))
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126 ## Matlab says default delimiter = whitespace.
12866
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diff changeset
127 ## strread() will pick this up further
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diff changeset
128 args(end+1:end+2) = {'delimiter', ""};
12866
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diff changeset
129 endif
fe6e2afcd9ee Revamp strread, textscan, textread functions for Matlab compatability
Philip Nienhuis <prnienhuis@users.sf.net>
parents: 12679
diff changeset
130
12914
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diff changeset
131 collop = false;
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diff changeset
132 ipos = find (strcmpi (args, "collectoutput"));
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parents: 12891
diff changeset
133 if (! isempty (ipos))
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parents: 12891
diff changeset
134 ## Search & concatenate consecutive columns of same class requested
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Philip Nienhuis <prnienhuis@users.sf.net>
parents: 12891
diff changeset
135 if (isscalar (args{ipos+1})
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parents: 12891
diff changeset
136 && (islogical (args{ipos+1}) || isnumeric (args{ipos+1})))
ac00ae83ea2e More compatibility improvements for textscan and strread
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parents: 12891
diff changeset
137 collop = args{ipos+1};
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parents: 12891
diff changeset
138 else
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parents: 12891
diff changeset
139 warning ("textscan: illegal value for CollectOutput parameter - ignored");
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parents: 12891
diff changeset
140 endif
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Philip Nienhuis <prnienhuis@users.sf.net>
parents: 12891
diff changeset
141 ## Remove argument before call to strread() below
ac00ae83ea2e More compatibility improvements for textscan and strread
Philip Nienhuis <prnienhuis@users.sf.net>
parents: 12891
diff changeset
142 args(ipos:ipos+1) = [];
ac00ae83ea2e More compatibility improvements for textscan and strread
Philip Nienhuis <prnienhuis@users.sf.net>
parents: 12891
diff changeset
143 endif
ac00ae83ea2e More compatibility improvements for textscan and strread
Philip Nienhuis <prnienhuis@users.sf.net>
parents: 12891
diff changeset
144
12866
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diff changeset
145 if (any (strcmpi (args, "returnonerror")))
fe6e2afcd9ee Revamp strread, textscan, textread functions for Matlab compatability
Philip Nienhuis <prnienhuis@users.sf.net>
parents: 12679
diff changeset
146 ## 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
147 ## can't be neatly implemented. strread() will pick it up anyway
12877
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parents: 12873
diff changeset
148 warning ('textscan: ReturnOnError is not fully implemented');
12866
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diff changeset
149 else
fe6e2afcd9ee Revamp strread, textscan, textread functions for Matlab compatability
Philip Nienhuis <prnienhuis@users.sf.net>
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diff changeset
150 ## Set default value (=true)
12877
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diff changeset
151 args(end+1:end+2) = {"returnonerror", 1};
12866
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diff changeset
152 endif
fe6e2afcd9ee Revamp strread, textscan, textread functions for Matlab compatability
Philip Nienhuis <prnienhuis@users.sf.net>
parents: 12679
diff changeset
153
fe6e2afcd9ee Revamp strread, textscan, textread functions for Matlab compatability
Philip Nienhuis <prnienhuis@users.sf.net>
parents: 12679
diff changeset
154 if (ischar (fid))
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Philip Nienhuis <prnienhuis@users.sf.net>
parents: 12679
diff changeset
155 ## Read from a text string
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Philip Nienhuis <prnienhuis@users.sf.net>
parents: 12679
diff changeset
156 if (nargout == 2)
fe6e2afcd9ee Revamp strread, textscan, textread functions for Matlab compatability
Philip Nienhuis <prnienhuis@users.sf.net>
parents: 12679
diff changeset
157 error ("textscan: cannot provide position information for character input");
fe6e2afcd9ee Revamp strread, textscan, textread functions for Matlab compatability
Philip Nienhuis <prnienhuis@users.sf.net>
parents: 12679
diff changeset
158 endif
fe6e2afcd9ee Revamp strread, textscan, textread functions for Matlab compatability
Philip Nienhuis <prnienhuis@users.sf.net>
parents: 12679
diff changeset
159 str = fid;
fe6e2afcd9ee Revamp strread, textscan, textread functions for Matlab compatability
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parents: 12679
diff changeset
160 else
14565
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Philip Nienhuis <prnienhuis@@users.sf.net>
parents: 14552
diff changeset
161 st_pos = ftell (fid);
12866
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parents: 12679
diff changeset
162 ## Skip header lines if requested
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Philip Nienhuis <prnienhuis@users.sf.net>
parents: 12679
diff changeset
163 headerlines = find (strcmpi (args, "headerlines"), 1);
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Philip Nienhuis <prnienhuis@users.sf.net>
parents: 12679
diff changeset
164 ## 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
165 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
166 fskipl (fid, varargin{headerlines + 1});
13141
e81ddf9cacd5 maint: untabify and remove trailing whitespace from source files
John W. Eaton <jwe@octave.org>
parents: 12916
diff changeset
167 args(headerlines:headerlines+1) = [];
14565
98aaebc56d7c 2012-03-25 Philip Nienhuis <prnienhuis@users.sf.net>
Philip Nienhuis <prnienhuis@@users.sf.net>
parents: 14552
diff changeset
168 st_pos = ftell (fid);
12866
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parents: 12679
diff changeset
169 endif
14565
98aaebc56d7c 2012-03-25 Philip Nienhuis <prnienhuis@users.sf.net>
Philip Nienhuis <prnienhuis@@users.sf.net>
parents: 14552
diff changeset
170 ## Read a first file chunk. Rest follows after endofline processing
98aaebc56d7c 2012-03-25 Philip Nienhuis <prnienhuis@users.sf.net>
Philip Nienhuis <prnienhuis@@users.sf.net>
parents: 14552
diff changeset
171 [str, count] = fscanf (fid, "%c", BUFLENGTH);
12866
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Philip Nienhuis <prnienhuis@users.sf.net>
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diff changeset
172 endif
fe6e2afcd9ee Revamp strread, textscan, textread functions for Matlab compatability
Philip Nienhuis <prnienhuis@users.sf.net>
parents: 12679
diff changeset
173
fe6e2afcd9ee Revamp strread, textscan, textread functions for Matlab compatability
Philip Nienhuis <prnienhuis@users.sf.net>
parents: 12679
diff changeset
174 ## Check for empty result
fe6e2afcd9ee Revamp strread, textscan, textread functions for Matlab compatability
Philip Nienhuis <prnienhuis@users.sf.net>
parents: 12679
diff changeset
175 if (isempty (str))
fe6e2afcd9ee Revamp strread, textscan, textread functions for Matlab compatability
Philip Nienhuis <prnienhuis@users.sf.net>
parents: 12679
diff changeset
176 warning ("textscan: no data read");
fe6e2afcd9ee Revamp strread, textscan, textread functions for Matlab compatability
Philip Nienhuis <prnienhuis@users.sf.net>
parents: 12679
diff changeset
177 C = [];
12877
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Rik <octave@nomad.inbox5.com>
parents: 12873
diff changeset
178 return;
ddea3962b024 Various improvements to strread, textread, textscan functions
Rik <octave@nomad.inbox5.com>
parents: 12873
diff changeset
179 endif
ddea3962b024 Various improvements to strread, textread, textscan functions
Rik <octave@nomad.inbox5.com>
parents: 12873
diff changeset
180
ddea3962b024 Various improvements to strread, textread, textscan functions
Rik <octave@nomad.inbox5.com>
parents: 12873
diff changeset
181 ## 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
182 endofline = find (strcmpi (args, "endofline"), 1);
ddea3962b024 Various improvements to strread, textread, textscan functions
Rik <octave@nomad.inbox5.com>
parents: 12873
diff changeset
183 if (! isempty (endofline))
13141
e81ddf9cacd5 maint: untabify and remove trailing whitespace from source files
John W. Eaton <jwe@octave.org>
parents: 12916
diff changeset
184 if (ischar (args{endofline + 1}))
12877
ddea3962b024 Various improvements to strread, textread, textscan functions
Rik <octave@nomad.inbox5.com>
parents: 12873
diff changeset
185 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
186 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
187 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
188 endif
12866
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Philip Nienhuis <prnienhuis@users.sf.net>
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diff changeset
189 else
13141
e81ddf9cacd5 maint: untabify and remove trailing whitespace from source files
John W. Eaton <jwe@octave.org>
parents: 12916
diff changeset
190 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
191 endif
12877
ddea3962b024 Various improvements to strread, textread, textscan functions
Rik <octave@nomad.inbox5.com>
parents: 12873
diff changeset
192 else
14565
98aaebc56d7c 2012-03-25 Philip Nienhuis <prnienhuis@users.sf.net>
Philip Nienhuis <prnienhuis@@users.sf.net>
parents: 14552
diff changeset
193 ## Determine EOL from file. Search for EOL candidates in first BUFLENGTH chars
98aaebc56d7c 2012-03-25 Philip Nienhuis <prnienhuis@users.sf.net>
Philip Nienhuis <prnienhuis@@users.sf.net>
parents: 14552
diff changeset
194 eol_srch_len = min (length (str), BUFLENGTH);
12877
ddea3962b024 Various improvements to strread, textread, textscan functions
Rik <octave@nomad.inbox5.com>
parents: 12873
diff changeset
195 ## First try DOS (CRLF)
14214
2fe0f5fa8cc3 Replace to-be-deprecated findstr occurrences with strfind.
Rik <octave@nomad.inbox5.com>
parents: 14213
diff changeset
196 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
197 eol_char = "\r\n";
ddea3962b024 Various improvements to strread, textread, textscan functions
Rik <octave@nomad.inbox5.com>
parents: 12873
diff changeset
198 ## Perhaps old Macintosh? (CR)
14214
2fe0f5fa8cc3 Replace to-be-deprecated findstr occurrences with strfind.
Rik <octave@nomad.inbox5.com>
parents: 14213
diff changeset
199 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
200 eol_char = "\r";
ddea3962b024 Various improvements to strread, textread, textscan functions
Rik <octave@nomad.inbox5.com>
parents: 12873
diff changeset
201 ## Otherwise, use plain UNIX (LF)
ddea3962b024 Various improvements to strread, textread, textscan functions
Rik <octave@nomad.inbox5.com>
parents: 12873
diff changeset
202 else
ddea3962b024 Various improvements to strread, textread, textscan functions
Rik <octave@nomad.inbox5.com>
parents: 12873
diff changeset
203 eol_char = "\n";
ddea3962b024 Various improvements to strread, textread, textscan functions
Rik <octave@nomad.inbox5.com>
parents: 12873
diff changeset
204 endif
ddea3962b024 Various improvements to strread, textread, textscan functions
Rik <octave@nomad.inbox5.com>
parents: 12873
diff changeset
205 ## Set up the default endofline param value
14565
98aaebc56d7c 2012-03-25 Philip Nienhuis <prnienhuis@users.sf.net>
Philip Nienhuis <prnienhuis@@users.sf.net>
parents: 14552
diff changeset
206 args(end+1:end+2) = {"endofline", eol_char};
98aaebc56d7c 2012-03-25 Philip Nienhuis <prnienhuis@users.sf.net>
Philip Nienhuis <prnienhuis@@users.sf.net>
parents: 14552
diff changeset
207 endif
98aaebc56d7c 2012-03-25 Philip Nienhuis <prnienhuis@users.sf.net>
Philip Nienhuis <prnienhuis@@users.sf.net>
parents: 14552
diff changeset
208
98aaebc56d7c 2012-03-25 Philip Nienhuis <prnienhuis@users.sf.net>
Philip Nienhuis <prnienhuis@@users.sf.net>
parents: 14552
diff changeset
209 if (!ischar (fid))
98aaebc56d7c 2012-03-25 Philip Nienhuis <prnienhuis@users.sf.net>
Philip Nienhuis <prnienhuis@@users.sf.net>
parents: 14552
diff changeset
210 ## Now that we know what EOL looks like, we can process format_repeat_count.
98aaebc56d7c 2012-03-25 Philip Nienhuis <prnienhuis@users.sf.net>
Philip Nienhuis <prnienhuis@@users.sf.net>
parents: 14552
diff changeset
211 ## FIXME The below isn't ML-compatible: counts lines, not format string uses
98aaebc56d7c 2012-03-25 Philip Nienhuis <prnienhuis@users.sf.net>
Philip Nienhuis <prnienhuis@@users.sf.net>
parents: 14552
diff changeset
212 if (isfinite (nlines) && (nlines >= 0))
98aaebc56d7c 2012-03-25 Philip Nienhuis <prnienhuis@users.sf.net>
Philip Nienhuis <prnienhuis@@users.sf.net>
parents: 14552
diff changeset
213 l_eol_char = length (eol_char);
98aaebc56d7c 2012-03-25 Philip Nienhuis <prnienhuis@users.sf.net>
Philip Nienhuis <prnienhuis@@users.sf.net>
parents: 14552
diff changeset
214 eoi = findstr (str, eol_char);
98aaebc56d7c 2012-03-25 Philip Nienhuis <prnienhuis@users.sf.net>
Philip Nienhuis <prnienhuis@@users.sf.net>
parents: 14552
diff changeset
215 n_eoi = length (eoi);
98aaebc56d7c 2012-03-25 Philip Nienhuis <prnienhuis@users.sf.net>
Philip Nienhuis <prnienhuis@@users.sf.net>
parents: 14552
diff changeset
216 nblks = 0;
98aaebc56d7c 2012-03-25 Philip Nienhuis <prnienhuis@users.sf.net>
Philip Nienhuis <prnienhuis@@users.sf.net>
parents: 14552
diff changeset
217 ## Avoid slow repeated str concatenation, first seek requested end of data
98aaebc56d7c 2012-03-25 Philip Nienhuis <prnienhuis@users.sf.net>
Philip Nienhuis <prnienhuis@@users.sf.net>
parents: 14552
diff changeset
218 while (n_eoi < nlines && count == BUFLENGTH)
98aaebc56d7c 2012-03-25 Philip Nienhuis <prnienhuis@users.sf.net>
Philip Nienhuis <prnienhuis@@users.sf.net>
parents: 14552
diff changeset
219 [nstr, count] = fscanf (fid, "%c", BUFLENGTH);
98aaebc56d7c 2012-03-25 Philip Nienhuis <prnienhuis@users.sf.net>
Philip Nienhuis <prnienhuis@@users.sf.net>
parents: 14552
diff changeset
220 if (count > 0)
98aaebc56d7c 2012-03-25 Philip Nienhuis <prnienhuis@users.sf.net>
Philip Nienhuis <prnienhuis@@users.sf.net>
parents: 14552
diff changeset
221 ## Watch out for multichar EOL being missed across buffer boundaries
98aaebc56d7c 2012-03-25 Philip Nienhuis <prnienhuis@users.sf.net>
Philip Nienhuis <prnienhuis@@users.sf.net>
parents: 14552
diff changeset
222 if (l_eol_char > 1)
98aaebc56d7c 2012-03-25 Philip Nienhuis <prnienhuis@users.sf.net>
Philip Nienhuis <prnienhuis@@users.sf.net>
parents: 14552
diff changeset
223 str = [str(end - length (eol_char) + 2 : end) nstr];
98aaebc56d7c 2012-03-25 Philip Nienhuis <prnienhuis@users.sf.net>
Philip Nienhuis <prnienhuis@@users.sf.net>
parents: 14552
diff changeset
224 else
98aaebc56d7c 2012-03-25 Philip Nienhuis <prnienhuis@users.sf.net>
Philip Nienhuis <prnienhuis@@users.sf.net>
parents: 14552
diff changeset
225 str = nstr;
98aaebc56d7c 2012-03-25 Philip Nienhuis <prnienhuis@users.sf.net>
Philip Nienhuis <prnienhuis@@users.sf.net>
parents: 14552
diff changeset
226 endif
98aaebc56d7c 2012-03-25 Philip Nienhuis <prnienhuis@users.sf.net>
Philip Nienhuis <prnienhuis@@users.sf.net>
parents: 14552
diff changeset
227 eoi = findstr (str, eol_char);
98aaebc56d7c 2012-03-25 Philip Nienhuis <prnienhuis@users.sf.net>
Philip Nienhuis <prnienhuis@@users.sf.net>
parents: 14552
diff changeset
228 n_eoi += numel (eoi);
98aaebc56d7c 2012-03-25 Philip Nienhuis <prnienhuis@users.sf.net>
Philip Nienhuis <prnienhuis@@users.sf.net>
parents: 14552
diff changeset
229 ++nblks;
98aaebc56d7c 2012-03-25 Philip Nienhuis <prnienhuis@users.sf.net>
Philip Nienhuis <prnienhuis@@users.sf.net>
parents: 14552
diff changeset
230 endif
98aaebc56d7c 2012-03-25 Philip Nienhuis <prnienhuis@users.sf.net>
Philip Nienhuis <prnienhuis@@users.sf.net>
parents: 14552
diff changeset
231 endwhile
98aaebc56d7c 2012-03-25 Philip Nienhuis <prnienhuis@users.sf.net>
Philip Nienhuis <prnienhuis@@users.sf.net>
parents: 14552
diff changeset
232 ## OK, found EOL delimiting last requested line. Compute ptr (incl. EOL)
98aaebc56d7c 2012-03-25 Philip Nienhuis <prnienhuis@users.sf.net>
Philip Nienhuis <prnienhuis@@users.sf.net>
parents: 14552
diff changeset
233 if (isempty (eoi))
98aaebc56d7c 2012-03-25 Philip Nienhuis <prnienhuis@users.sf.net>
Philip Nienhuis <prnienhuis@@users.sf.net>
parents: 14552
diff changeset
234 printf ("textscan: format repeat count specified but no endofline found\n");
98aaebc56d7c 2012-03-25 Philip Nienhuis <prnienhuis@users.sf.net>
Philip Nienhuis <prnienhuis@@users.sf.net>
parents: 14552
diff changeset
235 data_size = nblks * BUFLENGTH + count;
98aaebc56d7c 2012-03-25 Philip Nienhuis <prnienhuis@users.sf.net>
Philip Nienhuis <prnienhuis@@users.sf.net>
parents: 14552
diff changeset
236 else
98aaebc56d7c 2012-03-25 Philip Nienhuis <prnienhuis@users.sf.net>
Philip Nienhuis <prnienhuis@@users.sf.net>
parents: 14552
diff changeset
237 ## Compute data size to read incl complete EOL
98aaebc56d7c 2012-03-25 Philip Nienhuis <prnienhuis@users.sf.net>
Philip Nienhuis <prnienhuis@@users.sf.net>
parents: 14552
diff changeset
238 data_size = (nblks * BUFLENGTH) + eoi(end + min (nlines, n_eoi) - n_eoi) \
98aaebc56d7c 2012-03-25 Philip Nienhuis <prnienhuis@users.sf.net>
Philip Nienhuis <prnienhuis@@users.sf.net>
parents: 14552
diff changeset
239 + l_eol_char - 1;
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240 endif
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241 fseek (fid, st_pos, "bof");
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242 str = fscanf (fid, "%c", data_size);
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243 else
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244 fseek (fid, st_pos, "bof");
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245 str = fread (fid, "char=>char").';
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diff changeset
246 endif
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247 endif
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248
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249 ## Determine the number of data fields
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250 num_fields = numel (strfind (format, "%")) - numel (strfind (format, "%*"));
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251
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252 ## Strip trailing EOL to avoid returning stray missing values (f. strread)
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253 if (strcmp (str(end-length (eol_char) + 1 : end), eol_char));
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254 str(end-length (eol_char) + 1 : end) = "";
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255 endif
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256
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257 ## Call strread to make it do the real work
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258 C = cell (1, num_fields);
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diff changeset
259 [C{:}] = strread (str, format, args{:});
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260
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261 ## If requested, collect output columns of same class
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262 if (collop)
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263 C = colloutp (C);
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264 endif
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265
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266 if (nargout == 2)
14565
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267 ## Remember file position (persistent var)
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268 position = ftell (fid);
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269 endif
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270
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271 endfunction
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272
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273
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274 ## Collect consecutive columns of same class into one cell column
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275 function C = colloutp (C)
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276
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277 ## Start at rightmost column and work backwards to avoid ptr mixup
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278 ii = numel (C);
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279 while (ii > 1)
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280 clss1 = class (C{ii});
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281 jj = ii;
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282 while (jj > 1 && strcmp (clss1, class (C{jj - 1})))
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283 ## Column to the left is still same class; check next column to the left
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284 --jj;
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285 endwhile
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286 if (jj < ii)
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287 ## Concatenate columns into current column
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288 C{jj} = [C{jj : ii}];
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289 ## Wipe concatenated columns to the right, resume search to the left
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290 C(jj+1 : ii) = [];
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291 ii = jj - 1;
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292 else
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293 ## No similar class in column to the left, search from there
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294 --ii;
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295 endif
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296 endwhile
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297
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298 endfunction
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299
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300
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301 %!test
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302 %! str = "1, 2, 3, 4\n 5, , , 8\n 9, 10, 11, 12";
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303 %! fmtstr = "%f %d %f %s";
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304 %! c = textscan (str, fmtstr, 2, "delimiter", ",", "emptyvalue", -Inf);
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305 %! assert (isequal (c{1}, [1;5]));
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306 %! assert (length (c{1}), 2);
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307 %! assert (iscellstr (c{4}));
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308 %! assert (isequal (c{3}, [3; -Inf]));
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309
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diff changeset
310 %!test
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311 %! b = [10:10:100];
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312 %! b = [b; 8*b/5];
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313 %! str = sprintf ("%g miles/hr = %g kilometers/hr\n", b);
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314 %! fmt = "%f miles/hr = %f kilometers/hr";
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315 %! c = textscan (str, fmt);
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diff changeset
316 %! assert (b(1,:)', c{1}, 1e-5);
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diff changeset
317 %! assert (b(2,:)', c{2}, 1e-5);
12866
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diff changeset
318
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diff changeset
319 #%!test
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320 #%! str = "13, 72, NA, str1, 25\r\n// Middle line\r\n36, na, 05, str3, 6";
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diff changeset
321 #%! a = textscan (str, "%d %n %f %s %n", "delimiter", ",","treatAsEmpty", {"NA", "na"},"commentStyle", "//");
12914
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diff changeset
322 #%! assert (a{1}, int32([13; 36]));
12866
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diff changeset
323 #%! assert (a{2}, [72; NaN]);
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diff changeset
324 #%! assert (a{3}, [NaN; 5]);
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diff changeset
325 #%! assert (a{4}, {"str1"; "str3"});
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diff changeset
326 #%! assert (a{5}, [25; 6]);
11141
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diff changeset
327
12866
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diff changeset
328 %!test
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diff changeset
329 %! str = "Km:10 = hhhBjjj miles16hour\r\n";
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330 %! str = [str "Km:15 = hhhJjjj miles241hour\r\n"];
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diff changeset
331 %! str = [str "Km:2 = hhhRjjj miles3hour\r\n"];
fe6e2afcd9ee Revamp strread, textscan, textread functions for Matlab compatability
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diff changeset
332 %! str = [str "Km:25 = hhhZ\r\n"];
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diff changeset
333 %! fmt = "Km:%d = hhh%1sjjj miles%dhour";
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diff changeset
334 %! a = textscan (str, fmt, "delimiter", " ");
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diff changeset
335 %! assert (a{1}', int32([10 15 2 25]));
12866
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diff changeset
336 %! assert (a{2}', {'B' 'J' 'R' 'Z'});
12914
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diff changeset
337 %! assert (a{3}', int32([16 241 3 0]));
11141
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diff changeset
338
12891
f5a3f77d51aa strread.m, textscan.m: More Matlab compatability
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diff changeset
339 %% Test with default endofline parameter
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diff changeset
340 %!test
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diff changeset
341 %! c = textscan ("L1\nL2", "%s");
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diff changeset
342 %! assert (c{:}, {"L1"; "L2"});
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diff changeset
343
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344 %% Test with endofline parameter set to "" (empty) - newline should be in word
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345 %!test
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346 %! c = textscan ("L1\nL2", "%s", "endofline", "");
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diff changeset
347 %! assert (int8(c{:}{:}), int8([ 76, 49, 10, 76, 50 ]));
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diff changeset
348
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diff changeset
349 %!test
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diff changeset
350 %! # No delimiters at all besides EOL. Skip fields, even empty fields
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diff changeset
351 %! str = "Text1Text2Text\nTextText4Text\nText57Text";
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diff changeset
352 %! c = textscan (str, "Text%*dText%dText");
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diff changeset
353 %! assert (c{1}, int32 ([2; 4; 0]));
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diff changeset
354
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diff changeset
355 %!test
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diff changeset
356 %% CollectOutput test
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diff changeset
357 %! b = [10:10:100];
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diff changeset
358 %! b = [b; 8*b/5; 8*b*1000/5];
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diff changeset
359 %! str = sprintf ("%g miles/hr = %g (%g) kilometers (meters)/hr\n", b);
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diff changeset
360 %! fmt = "%f miles%s %s %f (%f) kilometers %*s";
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diff changeset
361 %! c = textscan (str, fmt, "collectoutput", 1);
12914
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diff changeset
362 %! assert (size(c{3}), [10, 2]);
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diff changeset
363 %! assert (size(c{2}), [10, 2]);
ac00ae83ea2e More compatibility improvements for textscan and strread
Philip Nienhuis <prnienhuis@users.sf.net>
parents: 12891
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364
12877
ddea3962b024 Various improvements to strread, textread, textscan functions
Rik <octave@nomad.inbox5.com>
parents: 12873
diff changeset
365 %% Test input validation
ddea3962b024 Various improvements to strread, textread, textscan functions
Rik <octave@nomad.inbox5.com>
parents: 12873
diff changeset
366 %!error textscan ()
ddea3962b024 Various improvements to strread, textread, textscan functions
Rik <octave@nomad.inbox5.com>
parents: 12873
diff changeset
367 %!error textscan (single (4))
ddea3962b024 Various improvements to strread, textread, textscan functions
Rik <octave@nomad.inbox5.com>
parents: 12873
diff changeset
368 %!error textscan ({4})
ddea3962b024 Various improvements to strread, textread, textscan functions
Rik <octave@nomad.inbox5.com>
parents: 12873
diff changeset
369 %!error <must be a string> textscan ("Hello World", 2)
ddea3962b024 Various improvements to strread, textread, textscan functions
Rik <octave@nomad.inbox5.com>
parents: 12873
diff changeset
370 %!error <cannot provide position information> [C, pos] = textscan ("Hello World")
ddea3962b024 Various improvements to strread, textread, textscan functions
Rik <octave@nomad.inbox5.com>
parents: 12873
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371 %!error <character value required> textscan ("Hello World", '%s', 'EndOfLine', 3)
12914
ac00ae83ea2e More compatibility improvements for textscan and strread
Philip Nienhuis <prnienhuis@users.sf.net>
parents: 12891
diff changeset
372