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1 /* |
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2 |
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3 Copyright (C) 1996, 1997 John W. Eaton |
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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 2, or (at your option) any |
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10 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, write to the Free |
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19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
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20 |
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21 */ |
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22 |
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240
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23 #ifdef HAVE_CONFIG_H |
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1192
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24 #include <config.h> |
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25 #endif |
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26 |
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1343
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27 #include <cstdarg> |
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1633
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28 #include <cstring> |
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29 |
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3503
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30 #include <strstream> |
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1728
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31 #include <string> |
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32 |
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1352
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33 #include "defun.h" |
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34 #include "error.h" |
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3707
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35 #include "input.h" |
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1742
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36 #include "pager.h" |
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1352
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37 #include "oct-obj.h" |
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38 #include "utils.h" |
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2370
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39 #include "ov.h" |
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3707
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40 #include "ov-usr-fcn.h" |
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41 #include "pt-pr-code.h" |
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42 #include "pt-stmt.h" |
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43 #include "toplev.h" |
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44 #include "unwind-prot.h" |
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2370
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45 #include "variables.h" |
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46 |
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2174
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47 // TRUE means that Octave will try to beep obnoxiously before printing |
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48 // error messages. |
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49 static bool Vbeep_on_error; |
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50 |
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3707
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51 // TRUE means that Octave will try to enter the debugger when an error |
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52 // is encountered. This will also inhibit printing of the normal |
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53 // traceback message (you will only see the top-level error message). |
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54 static bool Vdebug_on_error; |
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55 |
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56 // TRUE means that Octave will try to enter the debugger when a warning |
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57 // is encountered. |
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58 static bool Vdebug_on_warning; |
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59 |
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143
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60 // Current error state. |
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672
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61 int error_state = 0; |
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62 |
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3489
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63 // Current warning state. |
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64 int warning_state = 0; |
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65 |
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1489
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66 // Tell the error handler whether to print messages, or just store |
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67 // them for later. Used for handling errors in eval() and |
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68 // the `unwind_protect' statement. |
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3136
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69 bool buffer_error_messages = false; |
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70 |
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71 // The message buffer |
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3523
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72 std::ostrstream *error_message_buffer = 0; |
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143
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73 |
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3491
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74 // Warning messages are never buffered. |
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75 // XXX FIXME XXX -- we should provide another way to turn them off... |
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76 |
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77 static void |
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78 vwarning (const char *name, const char *fmt, va_list args) |
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79 { |
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80 flush_octave_stdout (); |
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81 |
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3523
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82 std::ostrstream output_buf; |
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3491
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83 |
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84 if (name) |
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85 { |
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86 octave_diary << name << ": "; |
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87 std::cerr << name << ": "; |
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3491
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88 } |
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89 |
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90 octave_vformat (octave_diary, fmt, args); |
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91 octave_vformat (std::cerr, fmt, args); |
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92 |
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93 octave_diary << std::endl; |
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94 std::cerr << std::endl; |
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3491
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95 } |
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96 |
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97 static void |
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98 verror (const char *name, const char *fmt, va_list args) |
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99 { |
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3585
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100 if (! buffer_error_messages) |
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101 flush_octave_stdout (); |
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914
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102 |
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2174
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103 bool to_beep_or_not_to_beep_p = Vbeep_on_error && ! error_state; |
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104 |
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105 std::ostrstream output_buf; |
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106 |
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2174
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107 if (to_beep_or_not_to_beep_p) |
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108 output_buf << "\a"; |
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109 |
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599
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110 if (name) |
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111 output_buf << name << ": "; |
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112 |
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113 octave_vformat (output_buf, fmt, args); |
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114 |
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115 output_buf << std::endl << std::ends; |
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581
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116 |
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117 char *msg = output_buf.str (); |
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118 |
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1489
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119 if (buffer_error_messages) |
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120 { |
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121 char *ptr = msg; |
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122 |
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123 if (! error_message_buffer) |
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124 { |
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125 error_message_buffer = new std::ostrstream; |
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126 |
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127 // XXX FIXME XXX -- this is ugly, but it prevents |
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128 // |
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129 // eval ("error (\"msg\")", "error (__error_text__)"); |
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130 // |
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131 // from printing `error: ' twice. Assumes that the NAME we |
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132 // have been given doesn't contain `:'. |
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133 |
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3162
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134 ptr = strchr (msg, ':'); |
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135 |
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136 if (ptr) |
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137 { |
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138 if (*++ptr != '\0') |
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139 ++ptr; |
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140 } |
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141 else |
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142 ptr = msg; |
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143 } |
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144 |
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145 *error_message_buffer << ptr; |
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146 } |
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147 else |
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148 { |
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2095
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149 octave_diary << msg; |
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150 std::cerr << msg; |
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151 } |
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152 |
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153 delete [] msg; |
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1
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154 } |
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155 |
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1266
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156 // Note that we don't actually print any message if the error string |
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157 // is just "" or "\n". This allows error ("") and error ("\n") to |
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158 // just set the error state. |
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159 |
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1005
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160 static void |
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161 error_1 (const char *name, const char *fmt, va_list args) |
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162 { |
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163 if (error_state != -2) |
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164 { |
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1489
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165 if (fmt) |
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1005
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166 { |
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1489
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167 if (*fmt) |
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1005
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168 { |
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169 int len = strlen (fmt); |
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170 if (fmt[len - 1] == '\n') |
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1266
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171 { |
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1489
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172 if (len > 1) |
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1266
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173 { |
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174 char *tmp_fmt = strsave (fmt); |
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175 tmp_fmt[len - 1] = '\0'; |
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176 verror (name, tmp_fmt, args); |
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177 delete [] tmp_fmt; |
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178 } |
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179 |
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180 error_state = -2; |
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181 } |
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182 else |
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183 verror (name, fmt, args); |
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184 } |
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185 } |
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186 else |
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187 panic ("error_1: invalid format"); |
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188 |
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189 if (! error_state) |
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190 error_state = 1; |
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191 } |
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192 } |
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193 |
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194 void |
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195 message (const char *name, const char *fmt, ...) |
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196 { |
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197 va_list args; |
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198 va_start (args, fmt); |
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199 verror (name, fmt, args); |
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200 va_end (args); |
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201 } |
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202 |
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203 void |
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204 usage (const char *fmt, ...) |
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205 { |
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206 va_list args; |
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207 va_start (args, fmt); |
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208 error_state = -1; |
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209 verror ("usage", fmt, args); |
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210 va_end (args); |
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211 } |
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212 |
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3707
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213 static void |
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214 pr_where_1 (const char *fmt, ...) |
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215 { |
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216 va_list args; |
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217 va_start (args, fmt); |
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218 error_1 (0, fmt, args); |
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219 va_end (args); |
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220 } |
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221 |
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222 static void |
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223 pr_where (void) |
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224 { |
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225 if (curr_statement) |
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226 { |
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227 std::string fcn_name = curr_function->function_name (); |
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228 std::string file_name = curr_function->fcn_file_name (); |
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229 |
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230 const char *nm |
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231 = file_name.empty () ? fcn_name.c_str () : file_name.c_str (); |
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232 |
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233 int l = curr_statement->line (); |
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234 int c = curr_statement->column (); |
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235 |
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236 pr_where_1 ("error: in %s near line %d, column %d:", nm, l, c); |
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237 |
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238 // Oops, note that the column number may not be correct |
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239 // since the code is being reproduced from the parse tree. |
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240 |
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241 std::ostrstream output_buf; |
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242 |
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243 tree_print_code tpc (output_buf, " "); |
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244 |
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245 curr_statement->accept (tpc); |
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246 |
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247 output_buf << ends; |
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248 |
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249 char *msg = output_buf.str (); |
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250 |
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251 pr_where_1 (msg); |
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252 |
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253 delete [] msg; |
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254 } |
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255 } |
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256 |
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257 void |
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258 warning (const char *fmt, ...) |
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259 { |
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260 va_list args; |
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261 va_start (args, fmt); |
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262 warning_state = 1; |
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263 vwarning ("warning", fmt, args); |
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264 va_end (args); |
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3707
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265 |
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266 if ((interactive || forced_interactive) |
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267 && Vdebug_on_warning && curr_function) |
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268 { |
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269 unwind_protect_bool (Vdebug_on_warning); |
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270 Vdebug_on_warning = false; |
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271 |
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272 pr_where (); |
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273 |
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274 do_keyboard (octave_value_list ()); |
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275 |
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276 unwind_protect::run (); |
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277 } |
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278 } |
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279 |
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280 void |
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281 error (const char *fmt, ...) |
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282 { |
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283 int init_state = error_state; |
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284 |
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285 va_list args; |
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286 va_start (args, fmt); |
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287 error_1 ("error", fmt, args); |
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288 va_end (args); |
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289 |
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290 if ((interactive || forced_interactive) |
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291 && Vdebug_on_error && init_state == 0 && curr_function) |
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292 { |
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293 unwind_protect_bool (Vdebug_on_error); |
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294 Vdebug_on_error = false; |
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295 |
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296 pr_where (); |
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297 |
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298 error_state = 0; |
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299 |
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300 do_keyboard (octave_value_list ()); |
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301 |
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302 unwind_protect::run (); |
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303 } |
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1005
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304 } |
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436
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305 |
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1005
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306 void |
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307 parse_error (const char *fmt, ...) |
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308 { |
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309 va_list args; |
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310 va_start (args, fmt); |
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311 error_1 (0, fmt, args); |
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1
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312 va_end (args); |
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313 } |
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314 |
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189
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315 void |
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1
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316 panic (const char *fmt, ...) |
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317 { |
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318 va_list args; |
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319 va_start (args, fmt); |
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3585
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320 buffer_error_messages = false; |
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1
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321 verror ("panic", fmt, args); |
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322 va_end (args); |
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323 abort (); |
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324 } |
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325 |
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1489
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326 typedef void (*error_fun)(const char *, ...); |
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327 |
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2086
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328 extern octave_value_list Fsprintf (const octave_value_list&, int); |
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329 |
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2086
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330 static octave_value_list |
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331 handle_message (error_fun f, const char *msg, const octave_value_list& args) |
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528
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332 { |
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2086
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333 octave_value_list retval; |
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528
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334 |
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3523
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335 std::string tstr; |
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1728
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336 |
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528
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337 int nargin = args.length (); |
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338 |
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2745
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339 if (nargin > 0) |
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528
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340 { |
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3066
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341 octave_value arg; |
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342 |
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343 if (nargin > 1) |
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344 { |
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345 octave_value_list tmp = Fsprintf (args, 1); |
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346 arg = tmp(0); |
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347 } |
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348 else |
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349 arg = args(0); |
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2745
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350 |
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351 if (arg.is_defined ()) |
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528
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352 { |
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2745
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353 if (arg.is_string ()) |
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354 { |
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355 tstr = arg.string_value (); |
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356 msg = tstr.c_str (); |
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357 |
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358 if (! msg) |
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359 return retval; |
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360 } |
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361 else if (arg.is_empty ()) |
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528
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362 return retval; |
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363 } |
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364 } |
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365 |
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1489
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366 // Ugh. |
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367 |
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368 int len = strlen (msg); |
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369 if (msg[len - 1] == '\n') |
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370 { |
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371 if (len > 1) |
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372 { |
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373 char *tmp_msg = strsave (msg); |
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374 tmp_msg[len - 1] = '\0'; |
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375 f ("%s\n", tmp_msg); |
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376 delete [] tmp_msg; |
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377 } |
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378 } |
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379 else |
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380 f ("%s", msg); |
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528
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381 |
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382 return retval; |
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383 } |
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384 |
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1957
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385 DEFUN (error, args, , |
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3373
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386 "-*- texinfo -*-\n\ |
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387 @deftypefn {Built-in Function} {} error (@var{template}, @dots{})\n\ |
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388 The @code{error} function formats the optional arguments under the\n\ |
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389 control of the template string @var{template} using the same rules as\n\ |
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390 the @code{printf} family of functions (@pxref{Formatted Output}).\n\ |
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391 The resulting message is prefixed by the string @samp{error: } and\n\ |
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392 printed on the @code{stderr} stream.\n\ |
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393 \n\ |
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394 Calling @code{error} also sets Octave's internal error state such that\n\ |
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395 control will return to the top level without evaluating any more\n\ |
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396 commands. This is useful for aborting from functions or scripts.\n\ |
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897
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397 \n\ |
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3373
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398 If the error message does not end with a new line character, Octave will\n\ |
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399 print a traceback of all the function calls leading to the error. For\n\ |
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400 example, given the following function definitions:\n\ |
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401 \n\ |
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402 @example\n\ |
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403 @group\n\ |
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404 function f () g () end\n\ |
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405 function g () h () end\n\ |
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406 function h () nargin == 1 || error (\"nargin != 1\"); end\n\ |
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407 @end group\n\ |
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408 @end example\n\ |
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1489
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409 \n\ |
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3373
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410 @noindent\n\ |
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411 calling the function @code{f} will result in a list of messages that\n\ |
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412 can help you to quickly locate the exact location of the error:\n\ |
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1489
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413 \n\ |
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3373
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414 @example\n\ |
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415 @group\n\ |
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416 f ()\n\ |
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417 error: nargin != 1\n\ |
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418 error: evaluating index expression near line 1, column 30\n\ |
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419 error: evaluating binary operator `||' near line 1, column 27\n\ |
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420 error: called from `h'\n\ |
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421 error: called from `g'\n\ |
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422 error: called from `f'\n\ |
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423 @end group\n\ |
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424 @end example\n\ |
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425 \n\ |
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426 If the error message ends in a new line character, Octave will print the\n\ |
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427 message but will not display any traceback messages as it returns\n\ |
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428 control to the top level. For example, modifying the error message\n\ |
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429 in the previous example to end in a new line causes Octave to only print\n\ |
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430 a single message:\n\ |
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431 \n\ |
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432 @example\n\ |
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433 @group\n\ |
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434 function h () nargin == 1 || error (\"nargin != 1\\n\"); end\n\ |
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435 f ()\n\ |
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436 error: nargin != 1\n\ |
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437 @end group\n\ |
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438 @end example\n\ |
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439 @end deftypefn") |
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897
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440 { |
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1489
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441 return handle_message (error, "unspecified error", args); |
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442 } |
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897
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443 |
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1957
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444 DEFUN (warning, args, , |
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3373
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445 "-*- texinfo -*-\n\ |
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446 @deftypefn {Built-in Function} {} warning (@var{msg})\n\ |
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447 Print a warning message @var{msg} prefixed by the string @samp{warning: }. \n\ |
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448 After printing the warning message, Octave will continue to execute\n\ |
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3600
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449 commands. You should use this function when you want to notify the user\n\ |
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450 of an unusual condition, but only when it makes sense for your program\n\ |
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451 to go on.\n\ |
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3373
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452 @end deftypefn") |
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1489
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453 { |
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454 return handle_message (warning, "unspecified warning", args); |
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897
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455 } |
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456 |
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1957
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457 DEFUN (usage, args, , |
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3373
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458 "-*- texinfo -*-\n\ |
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459 @deftypefn {Built-in Function} {} usage (@var{msg})\n\ |
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460 Print the message @var{msg}, prefixed by the string @samp{usage: }, and\n\ |
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461 set Octave's internal error state such that control will return to the\n\ |
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462 top level without evaluating any more commands. This is useful for\n\ |
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463 aborting from functions.\n\ |
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464 \n\ |
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465 After @code{usage} is evaluated, Octave will print a traceback of all\n\ |
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466 the function calls leading to the usage message.\n\ |
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899
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467 \n\ |
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3373
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468 You should use this function for reporting problems errors that result\n\ |
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469 from an improper call to a function, such as calling a function with an\n\ |
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470 incorrect number of arguments, or with arguments of the wrong type. For\n\ |
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471 example, most functions distributed with Octave begin with code like\n\ |
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472 this\n\ |
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473 \n\ |
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474 @example\n\ |
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475 @group\n\ |
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476 if (nargin != 2)\n\ |
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477 usage (\"foo (a, b)\");\n\ |
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478 endif\n\ |
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479 @end group\n\ |
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480 @end example\n\ |
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481 \n\ |
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482 @noindent\n\ |
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483 to check for the proper number of arguments.\n\ |
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484 @end deftypefn") |
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899
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485 { |
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1489
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486 return handle_message (usage, "unknown", args); |
|
899
|
487 } |
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|
488 |
|
3018
|
489 void |
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490 bind_global_error_variable (void) |
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491 { |
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3490
|
492 if (error_message_buffer) |
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493 { |
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3538
|
494 *error_message_buffer << std::ends; |
|
3018
|
495 |
|
3490
|
496 char *error_text = error_message_buffer->str (); |
|
3018
|
497 |
|
3490
|
498 bind_builtin_constant ("__error_text__", error_text, true); |
|
3018
|
499 |
|
3490
|
500 delete [] error_text; |
|
|
501 |
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|
502 delete error_message_buffer; |
|
3018
|
503 |
|
3490
|
504 error_message_buffer = 0; |
|
|
505 } |
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|
506 else |
|
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507 bind_builtin_constant ("__error_text__", "", true); |
|
3018
|
508 } |
|
|
509 |
|
|
510 void |
|
|
511 clear_global_error_variable (void *) |
|
|
512 { |
|
|
513 delete error_message_buffer; |
|
|
514 error_message_buffer = 0; |
|
|
515 |
|
3259
|
516 bind_builtin_constant ("__error_text__", "", true); |
|
3018
|
517 } |
|
|
518 |
|
2174
|
519 static int |
|
|
520 beep_on_error (void) |
|
|
521 { |
|
|
522 Vbeep_on_error = check_preference ("beep_on_error"); |
|
|
523 |
|
|
524 return 0; |
|
|
525 } |
|
|
526 |
|
3707
|
527 static int |
|
|
528 debug_on_error (void) |
|
|
529 { |
|
|
530 Vdebug_on_error = check_preference ("debug_on_error"); |
|
|
531 |
|
|
532 return 0; |
|
|
533 } |
|
|
534 |
|
|
535 static int |
|
|
536 debug_on_warning (void) |
|
|
537 { |
|
|
538 Vdebug_on_warning = check_preference ("debug_on_warning"); |
|
|
539 |
|
|
540 return 0; |
|
|
541 } |
|
|
542 |
|
2174
|
543 void |
|
|
544 symbols_of_error (void) |
|
|
545 { |
|
3258
|
546 DEFVAR (beep_on_error, 0.0, beep_on_error, |
|
3373
|
547 "-*- texinfo -*-\n\ |
|
|
548 @defvr {Built-in Variable} beep_on_error\n\ |
|
|
549 If the value of @code{beep_on_error} is nonzero, Octave will try\n\ |
|
|
550 to ring your terminal's bell before printing an error message. The\n\ |
|
|
551 default value is 0.\n\ |
|
|
552 @end defvr"); |
|
3018
|
553 |
|
3707
|
554 DEFVAR (debug_on_error, 0.0, debug_on_error, |
|
|
555 "-*- texinfo -*-\n\ |
|
|
556 @defvr {Built-in Variable} debug_on_error\n\ |
|
|
557 If the value of @code{debug_on_error} is nonzero, Octave will try\n\ |
|
|
558 to enter the debugger when an error is encountered. This will also\n\ |
|
|
559 inhibit printing of the normal traceback message (you will only see\n\ |
|
|
560 the top-level error message). The default value is 0.\n\ |
|
|
561 @end defvr"); |
|
|
562 |
|
|
563 DEFVAR (debug_on_warning, 0.0, debug_on_warning, |
|
|
564 "-*- texinfo -*-\n\ |
|
|
565 @defvr {Built-in Variable} debug_on_warning\n\ |
|
|
566 If the value of @code{debug_on_warning} is nonzero, Octave will try\n\ |
|
|
567 to enter the debugger when a warning is encountered. The default\n\ |
|
|
568 value is 0.\n\ |
|
|
569 @end defvr"); |
|
|
570 |
|
3141
|
571 DEFCONST (error_text, "", |
|
3373
|
572 "-*- texinfo -*-\n\ |
|
|
573 @defvr {Built-in Variable} error_text\n\ |
|
|
574 This variable contains the text of error messages that would have\n\ |
|
|
575 been printed in the body of the most recent @code{unwind_protect} or\n\ |
|
|
576 @code{try} statement or the @var{try} part of the most recent call to\n\ |
|
|
577 the @code{eval} function. Outside of the @code{unwind_protect} and\n\ |
|
|
578 @code{try} statements or the @code{eval} function, or if no error has\n\ |
|
|
579 occurred within them, the value of @code{error_text} is guaranteed to be\n\ |
|
|
580 the empty string.\n\ |
|
|
581 \n\ |
|
|
582 Note that the message does not include the first @samp{error: } prefix,\n\ |
|
|
583 so that it may easily be passed to the @code{error} function without\n\ |
|
|
584 additional processing@footnote{Yes, it's a kluge, but it seems to be a\n\ |
|
|
585 reasonably useful one.}.\n\ |
|
|
586 \n\ |
|
3402
|
587 @xref{The try Statement}, and @ref{The unwind_protect Statement}.\n\ |
|
3373
|
588 @end defvr"); |
|
2174
|
589 } |
|
|
590 |
|
1
|
591 /* |
|
|
592 ;;; Local Variables: *** |
|
|
593 ;;; mode: C++ *** |
|
|
594 ;;; End: *** |
|
|
595 */ |
