53 lines
1.2 KiB
Perl
53 lines
1.2 KiB
Perl
# assert.pl
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# tchrist@convex.com (Tom Christiansen)
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#
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# Usage:
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#
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# &assert('@x > @y');
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# &assert('$var > 10', $var, $othervar, @various_info);
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#
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# That is, if the first expression evals false, we blow up. The
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# rest of the args, if any, are nice to know because they will
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# be printed out by &panic, which is just the stack-backtrace
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# routine shamelessly borrowed from the perl debugger.
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sub assert {
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&panic("ASSERTION BOTCHED: $_[0]",$@) unless eval $_[0];
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}
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sub panic {
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select(STDERR);
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print "\npanic: @_\n";
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exit 1 if $] <= 4.003; # caller broken
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# stack traceback gratefully borrowed from perl debugger
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local($i,$_);
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local($p,$f,$l,$s,$h,$a,@a,@sub);
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for ($i = 0; ($p,$f,$l,$s,$h,$w) = caller($i); $i++) {
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@a = @DB'args;
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for (@a) {
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if (/^StB\000/ && length($_) == length($_main{'_main'})) {
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$_ = sprintf("%s",$_);
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}
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else {
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s/'/\\'/g;
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s/([^\0]*)/'$1'/ unless /^-?[\d.]+$/;
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s/([\200-\377])/sprintf("M-%c",ord($1)&0177)/eg;
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s/([\0-\37\177])/sprintf("^%c",ord($1)^64)/eg;
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}
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}
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$w = $w ? '@ = ' : '$ = ';
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$a = $h ? '(' . join(', ', @a) . ')' : '';
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push(@sub, "$w&$s$a from file $f line $l\n");
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}
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for ($i=0; $i <= $#sub; $i++) {
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print $sub[$i];
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}
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exit 1;
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}
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1;
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