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annotate scripts/io/textread.m @ 12880:ff264eae88cf

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textread.m, textscan.m: Read entire file when format repeat count is -1 * textread.m, textscan.m: Read entire file when format repeat count is -1.
author Rik <octave@nomad.inbox5.com>
date Sun, 24 Jul 2011 22:11:26 -0700
parents ddea3962b024
children e81ddf9cacd5
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 ## Copyright (C) 2009-2011 Eric Chassande-Mottin, CNRS (France)
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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{a}, @dots{}] =} textread (@var{filename})
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21 ## @deftypefnx {Function File} {[@var{a}, @dots{}] =} textread (@var{filename}, @var{format})
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22 ## @deftypefnx {Function File} {[@var{a}, @dots{}] =} textread (@var{filename}, @var{format}, @var{n})
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23 ## @deftypefnx {Function File} {[@var{a}, @dots{}] =} textread (@var{filename}, @var{format}, @var{prop1}, @var{value1}, @dots{})
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24 ## @deftypefnx {Function File} {[@var{a}, @dots{}] =} textread (@var{filename}, @var{format}, @var{n}, @var{prop1}, @var{value1}, @dots{})
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25 ## Read data from a text file.
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26 ##
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27 ## The file @var{filename} is read and parsed according to @var{format}. The
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28 ## function behaves like @code{strread} except it works by parsing a file
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29 ## instead of a string. See the documentation of @code{strread} for details.
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30 ##
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31 ## In addition to the options supported by @code{strread}, this function
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32 ## supports two more:
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33 ##
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34 ## @itemize
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35 ## @item "headerlines":
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36 ## The first @var{value} number of lines of @var{filename} are skipped.
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37 ##
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38 ## @item "endofline":
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39 ## Specify a single character or "\r\n". If no value is given, it will be
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40 ## inferred from the file. If set to "" (empty string) EOLs are ignored as
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41 ## delimiters.
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42 ## @end itemize
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43 ##
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44 ## The optional input @var{n} specifes the number of times to use
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45 ## @var{format} when parsing, i.e., the format repeat count.
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46 ##
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47 ## @seealso{strread, load, dlmread, fscanf, textscan}
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48 ## @end deftypefn
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49
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50 function varargout = textread (filename, format = "%f", varargin)
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51
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52 ## Check input
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53 if (nargin < 1)
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54 print_usage ();
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55 endif
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56
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57 if (! ischar (filename) || ! ischar (format))
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58 error ("textread: FILENAME and FORMAT arguments must be strings");
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59 endif
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60
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61 ## Read file
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62 fid = fopen (filename, "r");
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63 if (fid == -1)
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64 error ("textread: could not open '%s' for reading", filename);
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65 endif
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66
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67 ## Skip header lines if requested
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68 headerlines = find (strcmpi (varargin, "headerlines"), 1);
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69 ## Beware of zero valued headerline, fskipl would skip to EOF
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70 if (! isempty (headerlines) && (varargin{headerlines + 1} > 0))
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71 fskipl (fid, varargin{headerlines + 1});
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72 varargin(headerlines:headerlines+1) = [];
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73 endif
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74
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75 if (nargin > 2 && isnumeric (varargin{1}))
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76 nlines = varargin{1};
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77 else
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78 nlines = Inf;
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79 endif
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80
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81 if (isfinite (nlines) && (nlines >= 0))
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82 str = tmp_str = "";
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83 n = 0;
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84 ## FIXME: Can this be done without slow loop?
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85 while (ischar (tmp_str) && n++ <= nlines)
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86 str = strcat (str, tmp_str);
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87 tmp_str = fgets (fid);
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88 endwhile
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89 else
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90 str = fread (fid, "char=>char").';
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91 endif
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92 fclose (fid);
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93
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94 if (isempty (str))
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95 warning ("textread: empty file");
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96 return;
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97 endif
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98
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99 endofline = find (strcmpi (varargin, "endofline"), 1);
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100 if (! isempty (endofline))
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101 ## 'endofline' option set by user.
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102 if (! ischar (varargin{endofline + 1}));
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103 error ("textread: character value required for EndOfLine");
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104 endif
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105 else
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106 ## Determine EOL from file. Search for EOL candidates in first 3000 chars
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107 eol_srch_len = min (length (str), 3000);
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108 ## First try DOS (CRLF)
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109 if (! isempty (findstr ("\r\n", str(1 : eol_srch_len))))
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110 eol_char = "\r\n";
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111 ## Perhaps old Macintosh? (CR)
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112 elseif (! isempty (findstr ("\r", str(1 : eol_srch_len))))
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113 eol_char = "\r";
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114 ## Otherwise, use plain UNIX (LF)
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115 else
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116 eol_char = "\n";
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117 endif
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118 ## Set up default endofline param value
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119 varargin(end+1:end+2) = {'endofline', eol_char};
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120 endif
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121
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122 ## Set up default whitespace param value if needed
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123 if (isempty (find (strcmpi ('whitespace', varargin))))
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124 varargin(end+1:end+2) = {'whitespace', " \b\t"};
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125 endif
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126
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127 ## Call strread to make it do the real work
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128 [varargout{1:max (nargout, 1)}] = strread (str, format, varargin {:});
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129
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130 endfunction
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131
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132
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133 %!test
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134 %! f = tmpnam();
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135 %! d = rand (5, 3);
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136 %! dlmwrite (f, d, 'precision', '%5.2f');
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137 %! [a, b, c] = textread (f, "%f %f %f", "delimiter", ",", "headerlines", 3);
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138 %! unlink(f);
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139 %! assert (a, d(4:5, 1), 1e-2);
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140 %! assert (b, d(4:5, 2), 1e-2);
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141 %! assert (c, d(4:5, 3), 1e-2);
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142
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143 %% Test input validation
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144 %!error textread ()
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145 %!error textread (1)
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146 %!error <arguments must be strings> textread (1, '%f')
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147 %!error <arguments must be strings> textread ("fname", 1)
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148