1 | package diagnostics; |
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2 | |
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3 | =head1 NAME |
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4 | |
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5 | diagnostics - Perl compiler pragma to force verbose warning diagnostics |
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6 | |
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7 | splain - standalone program to do the same thing |
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8 | |
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9 | =head1 SYNOPSIS |
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10 | |
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11 | As a pragma: |
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12 | |
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13 | use diagnostics; |
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14 | use diagnostics -verbose; |
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15 | |
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16 | enable diagnostics; |
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17 | disable diagnostics; |
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18 | |
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19 | Aa a program: |
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20 | |
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21 | perl program 2>diag.out |
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22 | splain [-v] [-p] diag.out |
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23 | |
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24 | |
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25 | =head1 DESCRIPTION |
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26 | |
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27 | =head2 The C<diagnostics> Pragma |
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28 | |
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29 | This module extends the terse diagnostics normally emitted by both the |
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30 | perl compiler and the perl interpreter, augmenting them with the more |
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31 | explicative and endearing descriptions found in L<perldiag>. Like the |
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32 | other pragmata, it affects the compilation phase of your program rather |
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33 | than merely the execution phase. |
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34 | |
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35 | To use in your program as a pragma, merely invoke |
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36 | |
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37 | use diagnostics; |
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38 | |
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39 | at the start (or near the start) of your program. (Note |
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40 | that this I<does> enable perl's B<-w> flag.) Your whole |
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41 | compilation will then be subject(ed :-) to the enhanced diagnostics. |
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42 | These still go out B<STDERR>. |
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43 | |
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44 | Due to the interaction between runtime and compiletime issues, |
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45 | and because it's probably not a very good idea anyway, |
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46 | you may not use C<no diagnostics> to turn them off at compiletime. |
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47 | However, you may control there behaviour at runtime using the |
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48 | disable() and enable() methods to turn them off and on respectively. |
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49 | |
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50 | The B<-verbose> flag first prints out the L<perldiag> introduction before |
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51 | any other diagnostics. The $diagnostics::PRETTY variable can generate nicer |
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52 | escape sequences for pagers. |
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53 | |
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54 | Warnings dispatched from perl itself (or more accurately, those that match |
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55 | descriptions found in L<perldiag>) are only displayed once (no duplicate |
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56 | descriptions). User code generated warnings ala warn() are unaffected, |
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57 | allowing duplicate user messages to be displayed. |
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58 | |
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59 | =head2 The I<splain> Program |
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60 | |
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61 | While apparently a whole nuther program, I<splain> is actually nothing |
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62 | more than a link to the (executable) F<diagnostics.pm> module, as well as |
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63 | a link to the F<diagnostics.pod> documentation. The B<-v> flag is like |
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64 | the C<use diagnostics -verbose> directive. |
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65 | The B<-p> flag is like the |
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66 | $diagnostics::PRETTY variable. Since you're post-processing with |
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67 | I<splain>, there's no sense in being able to enable() or disable() processing. |
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68 | |
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69 | Output from I<splain> is directed to B<STDOUT>, unlike the pragma. |
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70 | |
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71 | =head1 EXAMPLES |
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72 | |
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73 | The following file is certain to trigger a few errors at both |
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74 | runtime and compiletime: |
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75 | |
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76 | use diagnostics; |
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77 | print NOWHERE "nothing\n"; |
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78 | print STDERR "\n\tThis message should be unadorned.\n"; |
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79 | warn "\tThis is a user warning"; |
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80 | print "\nDIAGNOSTIC TESTER: Please enter a <CR> here: "; |
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81 | my $a, $b = scalar <STDIN>; |
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82 | print "\n"; |
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83 | print $x/$y; |
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84 | |
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85 | If you prefer to run your program first and look at its problem |
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86 | afterwards, do this: |
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87 | |
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88 | perl -w test.pl 2>test.out |
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89 | ./splain < test.out |
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90 | |
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91 | Note that this is not in general possible in shells of more dubious heritage, |
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92 | as the theoretical |
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93 | |
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94 | (perl -w test.pl >/dev/tty) >& test.out |
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95 | ./splain < test.out |
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96 | |
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97 | Because you just moved the existing B<stdout> to somewhere else. |
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98 | |
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99 | If you don't want to modify your source code, but still have on-the-fly |
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100 | warnings, do this: |
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101 | |
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102 | exec 3>&1; perl -w test.pl 2>&1 1>&3 3>&- | splain 1>&2 3>&- |
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103 | |
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104 | Nifty, eh? |
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105 | |
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106 | If you want to control warnings on the fly, do something like this. |
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107 | Make sure you do the C<use> first, or you won't be able to get |
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108 | at the enable() or disable() methods. |
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109 | |
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110 | use diagnostics; # checks entire compilation phase |
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111 | print "\ntime for 1st bogus diags: SQUAWKINGS\n"; |
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112 | print BOGUS1 'nada'; |
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113 | print "done with 1st bogus\n"; |
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114 | |
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115 | disable diagnostics; # only turns off runtime warnings |
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116 | print "\ntime for 2nd bogus: (squelched)\n"; |
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117 | print BOGUS2 'nada'; |
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118 | print "done with 2nd bogus\n"; |
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119 | |
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120 | enable diagnostics; # turns back on runtime warnings |
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121 | print "\ntime for 3rd bogus: SQUAWKINGS\n"; |
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122 | print BOGUS3 'nada'; |
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123 | print "done with 3rd bogus\n"; |
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124 | |
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125 | disable diagnostics; |
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126 | print "\ntime for 4th bogus: (squelched)\n"; |
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127 | print BOGUS4 'nada'; |
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128 | print "done with 4th bogus\n"; |
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129 | |
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130 | =head1 INTERNALS |
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131 | |
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132 | Diagnostic messages derive from the F<perldiag.pod> file when available at |
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133 | runtime. Otherwise, they may be embedded in the file itself when the |
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134 | splain package is built. See the F<Makefile> for details. |
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135 | |
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136 | If an extant $SIG{__WARN__} handler is discovered, it will continue |
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137 | to be honored, but only after the diagnostics::splainthis() function |
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138 | (the module's $SIG{__WARN__} interceptor) has had its way with your |
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139 | warnings. |
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140 | |
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141 | There is a $diagnostics::DEBUG variable you may set if you're desperately |
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142 | curious what sorts of things are being intercepted. |
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143 | |
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144 | BEGIN { $diagnostics::DEBUG = 1 } |
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145 | |
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146 | |
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147 | =head1 BUGS |
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148 | |
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149 | Not being able to say "no diagnostics" is annoying, but may not be |
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150 | insurmountable. |
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151 | |
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152 | The C<-pretty> directive is called too late to affect matters. |
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153 | You have to do this instead, and I<before> you load the module. |
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154 | |
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155 | BEGIN { $diagnostics::PRETTY = 1 } |
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156 | |
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157 | I could start up faster by delaying compilation until it should be |
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158 | needed, but this gets a "panic: top_level" when using the pragma form |
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159 | in Perl 5.001e. |
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160 | |
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161 | While it's true that this documentation is somewhat subserious, if you use |
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162 | a program named I<splain>, you should expect a bit of whimsy. |
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163 | |
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164 | =head1 AUTHOR |
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165 | |
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166 | Tom Christiansen <F<tchrist@mox.perl.com>>, 25 June 1995. |
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167 | |
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168 | =cut |
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169 | |
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170 | use 5.005_64; |
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171 | use Carp; |
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172 | |
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173 | $VERSION = v1.0; |
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174 | |
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175 | use Config; |
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176 | ($privlib, $archlib) = @Config{qw(privlibexp archlibexp)}; |
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177 | if ($^O eq 'VMS') { |
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178 | require VMS::Filespec; |
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179 | $privlib = VMS::Filespec::unixify($privlib); |
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180 | $archlib = VMS::Filespec::unixify($archlib); |
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181 | } |
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182 | @trypod = ( |
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183 | "$archlib/pod/perldiag.pod", |
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184 | "$privlib/pod/perldiag-$Config{version}.pod", |
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185 | "$privlib/pod/perldiag.pod", |
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186 | "$archlib/pods/perldiag.pod", |
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187 | "$privlib/pods/perldiag-$Config{version}.pod", |
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188 | "$privlib/pods/perldiag.pod", |
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189 | ); |
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190 | # handy for development testing of new warnings etc |
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191 | unshift @trypod, "./pod/perldiag.pod" if -e "pod/perldiag.pod"; |
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192 | ($PODFILE) = ((grep { -e } @trypod), $trypod[$#trypod])[0]; |
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193 | |
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194 | $DEBUG ||= 0; |
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195 | my $WHOAMI = ref bless []; # nobody's business, prolly not even mine |
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196 | |
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197 | $| = 1; |
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198 | |
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199 | local $_; |
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200 | |
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201 | CONFIG: { |
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202 | $opt_p = $opt_d = $opt_v = $opt_f = ''; |
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203 | %HTML_2_Troff = %HTML_2_Latin_1 = %HTML_2_ASCII_7 = (); |
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204 | %exact_duplicate = (); |
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205 | |
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206 | unless (caller) { |
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207 | $standalone++; |
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208 | require Getopt::Std; |
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209 | Getopt::Std::getopts('pdvf:') |
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210 | or die "Usage: $0 [-v] [-p] [-f splainpod]"; |
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211 | $PODFILE = $opt_f if $opt_f; |
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212 | $DEBUG = 2 if $opt_d; |
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213 | $VERBOSE = $opt_v; |
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214 | $PRETTY = $opt_p; |
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215 | } |
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216 | |
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217 | if (open(POD_DIAG, $PODFILE)) { |
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218 | warn "Happy happy podfile from real $PODFILE\n" if $DEBUG; |
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219 | last CONFIG; |
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220 | } |
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221 | |
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222 | if (caller) { |
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223 | INCPATH: { |
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224 | for $file ( (map { "$_/$WHOAMI.pm" } @INC), $0) { |
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225 | warn "Checking $file\n" if $DEBUG; |
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226 | if (open(POD_DIAG, $file)) { |
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227 | while (<POD_DIAG>) { |
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228 | next unless /^__END__\s*# wish diag dbase were more accessible/; |
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229 | print STDERR "podfile is $file\n" if $DEBUG; |
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230 | last INCPATH; |
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231 | } |
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232 | } |
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233 | } |
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234 | } |
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235 | } else { |
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236 | print STDERR "podfile is <DATA>\n" if $DEBUG; |
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237 | *POD_DIAG = *main::DATA; |
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238 | } |
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239 | } |
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240 | if (eof(POD_DIAG)) { |
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241 | die "couldn't find diagnostic data in $PODFILE @INC $0"; |
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242 | } |
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243 | |
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244 | |
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245 | %HTML_2_Troff = ( |
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246 | 'amp' => '&', # ampersand |
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247 | 'lt' => '<', # left chevron, less-than |
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248 | 'gt' => '>', # right chevron, greater-than |
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249 | 'quot' => '"', # double quote |
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250 | |
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251 | "Aacute" => "A\\*'", # capital A, acute accent |
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252 | # etc |
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253 | |
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254 | ); |
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255 | |
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256 | %HTML_2_Latin_1 = ( |
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257 | 'amp' => '&', # ampersand |
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258 | 'lt' => '<', # left chevron, less-than |
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259 | 'gt' => '>', # right chevron, greater-than |
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260 | 'quot' => '"', # double quote |
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261 | |
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262 | "Aacute" => "\xC1" # capital A, acute accent |
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263 | |
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264 | # etc |
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265 | ); |
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266 | |
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267 | %HTML_2_ASCII_7 = ( |
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268 | 'amp' => '&', # ampersand |
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269 | 'lt' => '<', # left chevron, less-than |
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270 | 'gt' => '>', # right chevron, greater-than |
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271 | 'quot' => '"', # double quote |
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272 | |
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273 | "Aacute" => "A" # capital A, acute accent |
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274 | # etc |
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275 | ); |
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276 | |
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277 | *HTML_Escapes = do { |
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278 | if ($standalone) { |
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279 | $PRETTY ? \%HTML_2_Latin_1 : \%HTML_2_ASCII_7; |
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280 | } else { |
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281 | \%HTML_2_Latin_1; |
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282 | } |
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283 | }; |
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284 | |
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285 | *THITHER = $standalone ? *STDOUT : *STDERR; |
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286 | |
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287 | $transmo = <<EOFUNC; |
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288 | sub transmo { |
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289 | #local \$^W = 0; # recursive warnings we do NOT need! |
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290 | study; |
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291 | EOFUNC |
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292 | |
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293 | ### sub finish_compilation { # 5.001e panic: top_level for embedded version |
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294 | print STDERR "FINISHING COMPILATION for $_\n" if $DEBUG; |
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295 | ### local |
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296 | $RS = ''; |
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297 | local $_; |
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298 | while (<POD_DIAG>) { |
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299 | #s/(.*)\n//; |
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300 | #$header = $1; |
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301 | |
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302 | unescape(); |
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303 | if ($PRETTY) { |
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304 | sub noop { return $_[0] } # spensive for a noop |
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305 | sub bold { my $str =$_[0]; $str =~ s/(.)/$1\b$1/g; return $str; } |
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306 | sub italic { my $str = $_[0]; $str =~ s/(.)/_\b$1/g; return $str; } |
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307 | s/[BC]<(.*?)>/bold($1)/ges; |
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308 | s/[LIF]<(.*?)>/italic($1)/ges; |
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309 | } else { |
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310 | s/[BC]<(.*?)>/$1/gs; |
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311 | s/[LIF]<(.*?)>/$1/gs; |
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312 | } |
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313 | unless (/^=/) { |
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314 | if (defined $header) { |
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315 | if ( $header eq 'DESCRIPTION' && |
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316 | ( /Optional warnings are enabled/ |
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317 | || /Some of these messages are generic./ |
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318 | ) ) |
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319 | { |
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320 | next; |
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321 | } |
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322 | s/^/ /gm; |
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323 | $msg{$header} .= $_; |
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324 | } |
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325 | next; |
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326 | } |
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327 | unless ( s/=item (.*)\s*\Z//) { |
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328 | |
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329 | if ( s/=head1\sDESCRIPTION//) { |
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330 | $msg{$header = 'DESCRIPTION'} = ''; |
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331 | } |
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332 | next; |
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333 | } |
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334 | |
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335 | # strip formatting directives in =item line |
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336 | ($header = $1) =~ s/[A-Z]<(.*?)>/$1/g; |
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337 | |
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338 | if ($header =~ /%[csd]/) { |
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339 | $rhs = $lhs = $header; |
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340 | #if ($lhs =~ s/(.*?)%d(?!%d)(.*)/\Q$1\E\\d+\Q$2\E\$/g) { |
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341 | if ($lhs =~ s/(.*?)%d(?!%d)(.*)/\Q$1\E\\d+\Q$2\E/g) { |
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342 | $lhs =~ s/\\%s/.*?/g; |
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343 | } else { |
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344 | # if i had lookbehind negations, i wouldn't have to do this \377 noise |
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345 | $lhs =~ s/(.*?)%s/\Q$1\E.*?\377/g; |
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346 | #$lhs =~ s/\377([^\377]*)$/\Q$1\E\$/; |
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347 | $lhs =~ s/\377([^\377]*)$/\Q$1\E/; |
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348 | $lhs =~ s/\377//g; |
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349 | $lhs =~ s/\.\*\?$/.*/; # Allow %s at the end to eat it all |
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350 | } |
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351 | $lhs =~ s/\\%c/./g; |
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352 | $transmo .= " s{^$lhs}\n {\Q$rhs\E}s\n\t&& return 1;\n"; |
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353 | } else { |
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354 | $transmo .= " m{^\Q$header\E} && return 1;\n"; |
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355 | } |
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356 | |
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357 | print STDERR "$WHOAMI: Duplicate entry: \"$header\"\n" |
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358 | if $msg{$header}; |
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359 | |
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360 | $msg{$header} = ''; |
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361 | } |
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362 | |
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363 | |
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364 | close POD_DIAG unless *main::DATA eq *POD_DIAG; |
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365 | |
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366 | die "No diagnostics?" unless %msg; |
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367 | |
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368 | $transmo .= " return 0;\n}\n"; |
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369 | print STDERR $transmo if $DEBUG; |
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370 | eval $transmo; |
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371 | die $@ if $@; |
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372 | $RS = "\n"; |
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373 | ### } |
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374 | |
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375 | if ($standalone) { |
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376 | if (!@ARGV and -t STDIN) { print STDERR "$0: Reading from STDIN\n" } |
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377 | while (defined ($error = <>)) { |
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378 | splainthis($error) || print THITHER $error; |
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379 | } |
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380 | exit; |
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381 | } else { |
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382 | #$old_w = 0; |
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383 | $oldwarn = ''; $olddie = ''; |
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384 | } |
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385 | |
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386 | sub import { |
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387 | shift; |
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388 | #$old_w = $^W; |
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389 | $^W = 1; # yup, clobbered the global variable; tough, if you |
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390 | # want diags, you want diags. |
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391 | return if $SIG{__WARN__} eq \&warn_trap; |
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392 | |
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393 | for (@_) { |
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394 | |
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395 | /^-d(ebug)?$/ && do { |
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396 | $DEBUG++; |
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397 | next; |
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398 | }; |
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399 | |
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400 | /^-v(erbose)?$/ && do { |
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401 | $VERBOSE++; |
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402 | next; |
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403 | }; |
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404 | |
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405 | /^-p(retty)?$/ && do { |
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406 | print STDERR "$0: I'm afraid it's too late for prettiness.\n"; |
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407 | $PRETTY++; |
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408 | next; |
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409 | }; |
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410 | |
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411 | warn "Unknown flag: $_"; |
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412 | } |
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413 | |
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414 | $oldwarn = $SIG{__WARN__}; |
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415 | $olddie = $SIG{__DIE__}; |
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416 | $SIG{__WARN__} = \&warn_trap; |
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417 | $SIG{__DIE__} = \&death_trap; |
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418 | } |
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419 | |
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420 | sub enable { &import } |
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421 | |
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422 | sub disable { |
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423 | shift; |
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424 | #$^W = $old_w; |
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425 | return unless $SIG{__WARN__} eq \&warn_trap; |
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426 | $SIG{__WARN__} = $oldwarn; |
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427 | $SIG{__DIE__} = $olddie; |
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428 | } |
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429 | |
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430 | sub warn_trap { |
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431 | my $warning = $_[0]; |
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432 | if (caller eq $WHOAMI or !splainthis($warning)) { |
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433 | print STDERR $warning; |
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434 | } |
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435 | &$oldwarn if defined $oldwarn and $oldwarn and $oldwarn ne \&warn_trap; |
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436 | }; |
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437 | |
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438 | sub death_trap { |
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439 | my $exception = $_[0]; |
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440 | |
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441 | # See if we are coming from anywhere within an eval. If so we don't |
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442 | # want to explain the exception because it's going to get caught. |
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443 | my $in_eval = 0; |
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444 | my $i = 0; |
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445 | while (1) { |
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446 | my $caller = (caller($i++))[3] or last; |
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447 | if ($caller eq '(eval)') { |
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448 | $in_eval = 1; |
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449 | last; |
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450 | } |
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451 | } |
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452 | |
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453 | splainthis($exception) unless $in_eval; |
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454 | if (caller eq $WHOAMI) { print STDERR "INTERNAL EXCEPTION: $exception"; } |
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455 | &$olddie if defined $olddie and $olddie and $olddie ne \&death_trap; |
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456 | |
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457 | # We don't want to unset these if we're coming from an eval because |
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458 | # then we've turned off diagnostics. (Actually what does this next |
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459 | # line do? -PSeibel) |
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460 | $SIG{__DIE__} = $SIG{__WARN__} = '' unless $in_eval; |
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461 | local($Carp::CarpLevel) = 1; |
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462 | confess "Uncaught exception from user code:\n\t$exception"; |
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463 | # up we go; where we stop, nobody knows, but i think we die now |
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464 | # but i'm deeply afraid of the &$olddie guy reraising and us getting |
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465 | # into an indirect recursion loop |
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466 | }; |
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467 | |
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468 | sub splainthis { |
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469 | local $_ = shift; |
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470 | local $\; |
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471 | ### &finish_compilation unless %msg; |
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472 | s/\.?\n+$//; |
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473 | my $orig = $_; |
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474 | # return unless defined; |
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475 | s/, <.*?> (?:line|chunk).*$//; |
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476 | $real = s/(.*?) at .*? (?:line|chunk) \d+.*/$1/; |
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477 | s/^\((.*)\)$/$1/; |
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478 | if ($exact_duplicate{$orig}++) { |
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479 | return &transmo; |
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480 | } |
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481 | else { |
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482 | return 0 unless &transmo; |
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483 | } |
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484 | $orig = shorten($orig); |
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485 | if ($old_diag{$_}) { |
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486 | autodescribe(); |
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487 | print THITHER "$orig (#$old_diag{$_})\n"; |
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488 | $wantspace = 1; |
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489 | } else { |
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490 | autodescribe(); |
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491 | $old_diag{$_} = ++$count; |
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492 | print THITHER "\n" if $wantspace; |
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493 | $wantspace = 0; |
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494 | print THITHER "$orig (#$old_diag{$_})\n"; |
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495 | if ($msg{$_}) { |
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496 | print THITHER $msg{$_}; |
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497 | } else { |
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498 | if (0 and $standalone) { |
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499 | print THITHER " **** Error #$old_diag{$_} ", |
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500 | ($real ? "is" : "appears to be"), |
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501 | " an unknown diagnostic message.\n\n"; |
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502 | } |
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503 | return 0; |
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504 | } |
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505 | } |
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506 | return 1; |
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507 | } |
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508 | |
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509 | sub autodescribe { |
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510 | if ($VERBOSE and not $count) { |
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511 | print THITHER &{$PRETTY ? \&bold : \&noop}("DESCRIPTION OF DIAGNOSTICS"), |
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512 | "\n$msg{DESCRIPTION}\n"; |
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513 | } |
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514 | } |
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515 | |
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516 | sub unescape { |
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517 | s { |
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518 | E< |
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519 | ( [A-Za-z]+ ) |
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520 | > |
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521 | } { |
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522 | do { |
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523 | exists $HTML_Escapes{$1} |
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524 | ? do { $HTML_Escapes{$1} } |
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525 | : do { |
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526 | warn "Unknown escape: E<$1> in $_"; |
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527 | "E<$1>"; |
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528 | } |
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529 | } |
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530 | }egx; |
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531 | } |
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532 | |
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533 | sub shorten { |
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534 | my $line = $_[0]; |
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535 | if (length($line) > 79 and index($line, "\n") == -1) { |
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536 | my $space_place = rindex($line, ' ', 79); |
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537 | if ($space_place != -1) { |
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538 | substr($line, $space_place, 1) = "\n\t"; |
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539 | } |
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540 | } |
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541 | return $line; |
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542 | } |
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543 | |
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544 | |
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545 | # have to do this: RS isn't set until run time, but we're executing at compiletime |
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546 | $RS = "\n"; |
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547 | |
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548 | 1 unless $standalone; # or it'll complain about itself |
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549 | __END__ # wish diag dbase were more accessible |
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