1 | # assert.pl
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2 | # [email protected] (Tom Christiansen)
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3 | #
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4 | # Usage:
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5 | #
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6 | # &assert('@x > @y');
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7 | # &assert('$var > 10', $var, $othervar, @various_info);
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8 | #
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9 | # That is, if the first expression evals false, we blow up. The
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10 | # rest of the args, if any, are nice to know because they will
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11 | # be printed out by &panic, which is just the stack-backtrace
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12 | # routine shamelessly borrowed from the perl debugger.
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13 |
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14 | sub assert {
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15 | &panic("ASSERTION BOTCHED: $_[$[]",$@) unless eval $_[$[];
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16 | }
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17 |
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18 | sub panic {
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19 | package DB;
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20 |
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21 | select(STDERR);
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22 |
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23 | print "\npanic: @_\n";
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24 |
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25 | exit 1 if $] <= 4.003; # caller broken
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26 |
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27 | # stack traceback gratefully borrowed from perl debugger
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28 |
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29 | local $_;
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30 | my $i;
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31 | my ($p,$f,$l,$s,$h,$a,@a,@frames);
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32 | for ($i = 0; ($p,$f,$l,$s,$h,$w) = caller($i); $i++) {
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33 | @a = @args;
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34 | for (@a) {
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35 | if (/^StB\000/ && length($_) == length($_main{'_main'})) {
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36 | $_ = sprintf("%s",$_);
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37 | }
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38 | else {
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39 | s/'/\\'/g;
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40 | s/([^\0]*)/'$1'/ unless /^-?[\d.]+$/;
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41 | s/([\200-\377])/sprintf("M-%c",ord($1)&0177)/eg;
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42 | s/([\0-\37\177])/sprintf("^%c",ord($1)^64)/eg;
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43 | }
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44 | }
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45 | $w = $w ? '@ = ' : '$ = ';
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46 | $a = $h ? '(' . join(', ', @a) . ')' : '';
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47 | push(@frames, "$w&$s$a from file $f line $l\n");
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48 | }
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49 | for ($i=0; $i <= $#frames; $i++) {
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50 | print $frames[$i];
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51 | }
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52 | exit 1;
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53 | }
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54 |
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55 | 1;
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