Mercurial > octave-nkf

annotate libinterp/octave-value/ov-oncleanup.cc @ 20615:729a85dafba8

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use new string_value method to handle value extraction errors * ov-class.cc, ov-classdef.cc, ov-fcn-handle.cc, ov-fcn-inline.cc, ov.cc, pt-idx.cc: Use new string_value method.
author John W. Eaton <jwe@octave.org>
date Thu, 08 Oct 2015 17:55:57 -0400
parents b70cc4bd8109
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 /*
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2
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3 Copyright (C) 2010-2015 VZLU Prague
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4
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5 This file is part of Octave.
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6
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7 Octave is free software; you can redistribute it and/or modify it
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8 under the terms of the GNU General Public License as published by the
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9 Free Software Foundation; either version 3 of the License, or (at your
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10 option) any later version.
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11
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12 Octave is distributed in the hope that it will be useful, but WITHOUT
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13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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15 for more details.
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16
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17 You should have received a copy of the GNU General Public License
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18 along with Octave; see the file COPYING. If not, see
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19 <http://www.gnu.org/licenses/>.
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20
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21 */
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22
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23 #ifdef HAVE_CONFIG_H
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24 #include <config.h>
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25 #endif
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26
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27 #include "defun.h"
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28 #include "ov-oncleanup.h"
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29 #include "ov-fcn.h"
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30 #include "ov-usr-fcn.h"
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31 #include "pt-misc.h"
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32 #include "toplev.h"
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33
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34 DEFINE_OV_TYPEID_FUNCTIONS_AND_DATA (octave_oncleanup, "onCleanup",
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35 "onCleanup");
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36
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37 octave_oncleanup::octave_oncleanup (const octave_value& f)
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38 : fcn (f)
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39 {
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40 if (f.is_function_handle ())
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41 {
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42 octave_function *fptr = f.function_value (true);
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43 if (fptr)
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44 {
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45 octave_user_function *uptr
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46 = dynamic_cast<octave_user_function *> (fptr);
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47
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48 if (uptr != 0)
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49 {
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50 tree_parameter_list *pl = uptr->parameter_list ();
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51
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52 if (pl != 0 && pl->length () > 0)
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53 warning ("onCleanup: cleanup action takes parameters");
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54 }
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55 }
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56 else
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57 error ("onCleanup: no default dispatch for function handle");
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58 }
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59 else
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60 {
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61 fcn = octave_value ();
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62 error ("onCleanup: argument must be a function handle");
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63 }
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64 }
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65
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66 octave_oncleanup::~octave_oncleanup (void)
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67 {
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68 if (fcn.is_undefined ())
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69 return;
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70
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71 unwind_protect frame;
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72
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73 // Clear interrupts.
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74 frame.protect_var (octave_interrupt_state);
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75 octave_interrupt_state = 0;
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76
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77 // Disallow quit().
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78 frame.protect_var (quit_allowed);
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79 quit_allowed = false;
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80
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81 try
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82 {
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83 // Run the actual code.
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84 fcn.do_multi_index_op (0, octave_value_list ());
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85 }
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86 catch (const octave_interrupt_exception&)
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87 {
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88 // Swallow the interrupt.
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89 warning ("onCleanup: interrupt occured in cleanup action");
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90 }
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91 catch (const octave_execution_exception&)
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92 {
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93 // Propagate the error.
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94 throw;
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95 }
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96 catch (...) // Yes, the black hole. We're in a d-tor.
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97 {
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98 // This shouldn't happen, in theory.
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99 error ("onCleanup: internal error: unhandled exception in cleanup action");
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100 }
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101 }
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102
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103 octave_scalar_map
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104 octave_oncleanup::scalar_map_value (void) const
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105 {
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106 octave_scalar_map retval;
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107 retval.setfield ("task", fcn);
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108 return retval;
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109 }
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110
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111 bool
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112 octave_oncleanup::save_ascii (std::ostream& /* os */)
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113 {
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114 warning ("save: unable to save onCleanup variables, skipping");
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115
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116 return true;
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117 }
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118
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119 bool
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120 octave_oncleanup::load_ascii (std::istream& /* is */)
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121 {
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122 // Silently skip object that was not saved
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123 return true;
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124 }
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125
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126 bool
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127 octave_oncleanup::save_binary (std::ostream& /* os */,
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128 bool& /* save_as_floats */)
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129 {
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130 warning ("save: unable to save onCleanup variables, skipping");
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131
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132 return true;
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133 }
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134
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135 bool
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136 octave_oncleanup::load_binary (std::istream& /* is */, bool /* swap */,
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137 oct_mach_info::float_format /* fmt */)
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138 {
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139 // Silently skip object that was not saved
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140 return true;
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141 }
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142
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143 bool
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144 octave_oncleanup::save_hdf5 (octave_hdf5_id /* loc_id */,
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145 const char * /* name */,
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146 bool /* save_as_floats */)
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147 {
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148 warning ("save: unable to save onCleanup variables, skipping");
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149
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150 return true;
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151 }
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152
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153 bool
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154 octave_oncleanup::load_hdf5 (octave_hdf5_id /* loc_id */,
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155 const char * /* name */)
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156 {
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157 // Silently skip object that was not saved
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158 return true;
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159 }
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160
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161 void
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162 octave_oncleanup::print (std::ostream& os, bool pr_as_read_syntax)
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163 {
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164 print_raw (os, pr_as_read_syntax);
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165 newline (os);
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166 }
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167
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168 void
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169 octave_oncleanup::print_raw (std::ostream& os, bool pr_as_read_syntax) const
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170 {
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171 os << "onCleanup (";
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172 if (fcn.is_defined ())
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173 fcn.print_raw (os, pr_as_read_syntax);
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174 os << ")";
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175 }
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176
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177 DEFUN (onCleanup, args, ,
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178 "-*- texinfo -*-\n\
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179 @deftypefn {Built-in Function} {@var{obj} =} onCleanup (@var{function})\n\
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180 Create a special object that executes a given function upon destruction.\n\
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181 \n\
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182 If the object is copied to multiple variables (or cell or struct array\n\
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183 elements) or returned from a function, @var{function} will be executed after\n\
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184 clearing the last copy of the object. Note that if multiple local onCleanup\n\
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185 variables are created, the order in which they are called is unspecified.\n\
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186 For similar functionality @xref{The unwind_protect Statement}.\n\
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187 @end deftypefn")
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188 {
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189 octave_value retval;
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190
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191 if (args.length () == 1)
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192 retval = octave_value (new octave_oncleanup (args(0)));
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193 else
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194 print_usage ();
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195
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196 return retval;
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197 }
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198
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199 /*
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200 %!test
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201 %! old_wstate = warning ("query");
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202 %! unwind_protect
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203 %! trigger = onCleanup (@() warning ("on", "__MY_WARNING__"));
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204 %! warning ("off", "__MY_WARNING__");
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205 %! assert ((warning ("query", "__MY_WARNING__")).state, "off");
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206 %! clear trigger;
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207 %! assert ((warning ("query", "__MY_WARNING__")).state, "on");
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208 %! unwind_protect_cleanup
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209 %! warning (old_wstate);
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210 %! end_unwind_protect
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211 */