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annotate scripts/java/usejava.m @ 16195:b52d2f9294b6

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use class for reading lexer input * input.h, input.cc (octave_base_input_reader, octave_terminal_reader, octave_file_reader, octave_eval_string_reader): New classes. (octave_gets): Now a member function of octave_base_reader. (get_user_input): Delete function. Move actions to octave_terminal_reader::get_input and octave_eval_string_reader::get_input. function. Call from octave_file_reader::get_input. Don't check whether reading an eval string. (current_eval_string, get_input_from_eval_string): Delete global variables. (get_debug_input): Check CURR_LEXER->input_from_eval_string instead of global get_input_from_eval_string variable. Don't protect get_input_from_eval_string. * lex.h (octave_lexer::input_reader): New data member. (octave_lexer::octave_lexer (void)): Initialize it. (octave_lexer::octave_lexer (const std::string&), octave_lexer::octave_lexer (FILE *)): New constructors. * lex.h, lex.cc (octave_lexer::input_buffer::fill): New function. (octave_lexer::input_buffer::read): Delete. (octave_lexer::read): Rename from octave_read. Call reader to get input, and then hand it to the input_buffer instead of asking the input buffer to read input. Change all callers. (octave_lexer::input_source, octave_lexer::input_from_eval_string): New functions. Call octave_lexer::input_from_eval_string instead of using get_input_from_eval_string. * oct-parse.in.yy (octave_parser::octave_parser (FILE *), octave_parser::octave_parser (const std::string&)): New constructors. (parse_fcn_file): Pass FILE pointer to octave_parser constructor. (eval_string): Pass string to octave_parser constructor instead of setting global current_eval_string variable.
author John W. Eaton <jwe@octave.org>
date Tue, 05 Mar 2013 10:19:51 -0500
parents 420b5603cbbf
children e2de3c8882be
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72c96de7a403 maint: update copyright notices for 2012
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1 ## Copyright (C) 2012 Rik Wehbring
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2 ## Parts Copyright (C) 2012 Philip Nienhuis <prnienhuis@users.sf.net>
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3 ##
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4 ## This file is part of Octave.
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5 ##
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6 ## Octave is free software; you can redistribute it and/or modify it
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7 ## under the terms of the GNU General Public License as published by
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8 ## the Free Software Foundation; either version 3 of the License, or (at
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9 ## your option) any later version.
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10 ##
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11 ## Octave is distributed in the hope that it will be useful, but
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12 ## WITHOUT ANY WARRANTY; without even the implied warranty of
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13 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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14 ## General Public License for more details.
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15 ##
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16 ## You should have received a copy of the GNU General Public License
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17 ## along with Octave; see the file COPYING. If not, see
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18 ## <http://www.gnu.org/licenses/>.
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19
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20 ## -*- texinfo -*-
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21 ## @deftypefn {Function File} {} usejava (@var{feature})
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22 ## Return true if the Java element @var{feature} is available.
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23 ##
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24 ## Possible features are:
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25 ##
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26 ## @table @asis
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27 ## @item "awt"
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28 ## Abstract Window Toolkit for GUIs.
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29 ##
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30 ## @item "desktop"
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31 ## Interactive desktop is running.
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32 ##
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33 ## @item "jvm"
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34 ## Java Virtual Machine.
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35 ##
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36 ## @item "swing"
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37 ## Swing components for lightweight GUIs.
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38 ## @end table
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39 ##
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40 ## @code{usejava} determines if specific Java features are available in an
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41 ## Octave session. This function is provided for scripts which may alter
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42 ## their behavior based on the availability of Java. The feature "desktop"
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43 ## always returns @code{false} as Octave has no Java-based desktop. Other
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44 ## features may be available if Octave was compiled with the Java Interface
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45 ## and Java is installed.
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46 ## @end deftypefn
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47
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48 function retval = usejava (feature)
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49
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50 if (nargin != 1 || ! ischar (feature))
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51 print_usage ();
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52 endif
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53
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54 retval = false;
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55
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56 switch feature
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57 ## For each feature, try methods() on a Java class of a feature
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58 case "awt"
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59 try
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60 dum = methods ("java.awt.Frame");
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61 retval = true;
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62 end_try_catch
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63 case "desktop"
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64 ## Octave has no Java based GUI/desktop, leave retval = false
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65 case "jvm"
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66 try
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67 dum = methods ("java.lang.Runtime");
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68 retval = true;
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69 end_try_catch
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70 case "swing"
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71 try
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72 dum = methods ("javax.swing.Popup");
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73 retval = true;
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74 end_try_catch
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75 otherwise
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76 error ("usejava: unrecognized feature '%s'", feature);
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77 endswitch
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78
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79 endfunction
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80
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81
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82 %!assert (usejava ("desktop"), false)
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83
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84 %!testif HAVE_JAVA
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85 %! assert (usejava ("jvm"), true);
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86
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87 %% Test input validation
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88 %!error usejava ()
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89 %!error usejava (1, 2)
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90 %!error usejava (1)
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91 %!error <unrecognized feature> usejava ("abc")
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92