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annotate scripts/java/javachk.m @ 20038:9fc020886ae9

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maint: Clean up m-files to follow Octave coding conventions. Try to trim long lines to < 80 chars. Use '##' for single line comments. Use '(...)' around tests for if/elseif/switch/while. Abut cell indexing operator '{' next to variable. Abut array indexing operator '(' next to variable. Use space between negation operator '!' and following expression. Use two newlines between endfunction and start of %!test or %!demo code. Remove unnecessary parens grouping between short-circuit operators. Remove stray extra spaces (typos) between variables and assignment operators. Remove stray extra spaces from ends of lines.
author Rik <rik@octave.org>
date Mon, 23 Feb 2015 14:54:39 -0800
parents 4197fc428c7d
children 03b9d17a2d95
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
19898
4197fc428c7d maint: Update copyright notices for 2015.
John W. Eaton <jwe@octave.org>
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1 ## Copyright (C) 2014-2015 Philip Nienhuis
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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} {} javachk (@var{feature})
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21 ## @deftypefnx {Function File} {} javachk (@var{feature}, @var{component})
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22 ## @deftypefnx {Function File} {@var{msg} =} javachk (@dots{})
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23 ## Check for the presence of the Java @var{feature} in the current session
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24 ## and print or return an error message if it is not.
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25 ##
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26 ## Possible features are:
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27 ##
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28 ## @table @asis
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29 ## @item @qcode{"awt"}
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30 ## Abstract Window Toolkit for GUIs.
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31 ##
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32 ## @item @qcode{"desktop"}
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33 ## Interactive desktop is running.
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34 ##
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35 ## @item @qcode{"jvm"}
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36 ## Java Virtual Machine.
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37 ##
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38 ## @item @qcode{"swing"}
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39 ## Swing components for lightweight GUIs.
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40 ## @end table
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41 ##
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42 ## If @var{feature} is supported and:
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43 ##
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44 ## @itemize @bullet
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45 ## @item
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46 ## No output argument is requested:
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47 ##
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48 ## Return an empty string
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49 ##
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50 ## @item
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51 ## An output argument is requested:
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52 ##
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53 ## Return a struct with fields @qcode{"feature"} and @qcode{"identifier"}
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54 ## both empty
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55 ##
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56 ## @end itemize
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57 ##
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58 ## If @var{feature} is not supported and:
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59 ##
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60 ## @itemize @bullet
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61 ## @item
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62 ## No output argument is requested:
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63 ##
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64 ## Emit an error message.
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65 ##
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66 ## @item
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67 ## An output argument is requested:
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68 ##
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69 ## Return a struct with field @qcode{"feature"} set to @var{feature} and
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70 ## field @qcode{"identifier"} set to @var{component}
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71 ##
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72 ## @end itemize
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73 ##
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74 ## The optional input @var{component} will be used in place of @var{feature}
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75 ## in any error messages for greater specificity.
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76 ##
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77 ## @code{javachk} determines if specific Java features are available in an
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78 ## Octave session. This function is provided for scripts which may alter
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79 ## their behavior based on the availability of Java. The feature
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80 ## @qcode{"desktop"} is never available as Octave has no Java-based desktop.
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81 ## Other features may be available if Octave was compiled with the Java
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82 ## Interface and Java is installed.
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83 ##
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84 ## @seealso{error, usejava}
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85 ## @end deftypefn
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86
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87 ## Author: Philip Nienhuis <prnienhuis at users.sf.net>
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88 ## Created: 2014-04-19
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89
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90 function msg = javachk (feature, component="")
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91
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92 msg = "";
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93 chk = false;
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94 switch (feature)
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95 ## For each feature, try methods() on a Java class of a feature
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96 case "awt"
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97 try
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98 dum = methods ("java.awt.Frame");
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99 chk = true;
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100 end_try_catch
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101 case "desktop"
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102 ## Octave has no Java based GUI/desktop, leave chk = false
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103 case "jvm"
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104 try
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105 dum = methods ("java.lang.Runtime");
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106 chk = true;
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107 end_try_catch
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108 case "swing"
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109 try
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110 dum = methods ("javax.swing.Popup");
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111 chk = true;
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112 end_try_catch
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113 otherwise
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114 error ("javachk: unrecognized feature '%s', can be one of 'awt'|'desktop'|'jvm'|'swing'\n", feature);
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115 endswitch
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116
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117 if (! chk)
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118 ## Desired feature not present
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119 if (nargout >= 1)
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120 msg.message = sprintf ("javachk: %s is not supported", feature);
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121 msg.identifier = component;
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122 else
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123 if (! isempty (component))
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124 err = sprintf ("javachk: %s is not supported\n", component);
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125 else
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126 err = sprintf ("javachk: %s is not supported\n", feature);
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127 endif
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128 error (err);
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129 endif
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130 endif
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131
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132 endfunction
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133
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135 %!error <javachk: desktop is not supported> javachk ("desktop")
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136 %!error <Java DESKTOP is not supported> javachk ("desktop", "Java DESKTOP")
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137 %!test
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138 %! msg = javachk ("desktop");
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139 %! assert (msg.message, "javachk: desktop is not supported");
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140 %! assert (msg.identifier, "");
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141 %!test
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142 %! msg = javachk ("desktop", "Java DESKTOP");
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143 %! assert (msg.message, "javachk: desktop is not supported");
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144 %! assert (msg.identifier, "Java DESKTOP");
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145
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146 %!testif HAVE_JAVA
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147 %! assert (javachk ("jvm"), "");
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148
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9fc020886ae9 maint: Clean up m-files to follow Octave coding conventions.
Rik <rik@octave.org>
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149 ## Test input validation
18886
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150 %!error <javachk: unrecognized feature 'foobar'> javachk ("foobar")
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151