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f1ca563b |
1 | # assert.pl |
2 | # tchrist@convex.com (Tom Christiansen) |
3 | # |
4 | # Usage: |
5 | # |
6 | # &assert('@x > @y'); |
7 | # &assert('$var > 10', $var, $othervar, @various_info); |
8 | # |
9 | # That is, if the first expression evals false, we blow up. The |
10 | # rest of the args, if any, are nice to know because they will |
11 | # be printed out by &panic, which is just the stack-backtrace |
12 | # routine shamelessly borrowed from the perl debugger. |
13 | |
14 | sub assert { |
15 | &panic("ASSERTION BOTCHED: $_[0]",$@) unless eval $_[0]; |
16 | } |
17 | |
18 | sub panic { |
19 | select(STDERR); |
20 | |
21 | print "\npanic: @_\n"; |
22 | |
23 | exit 1 if $] <= 4.003; # caller broken |
24 | |
25 | # stack traceback gratefully borrowed from perl debugger |
26 | |
27 | local($i,$_); |
28 | local($p,$f,$l,$s,$h,$a,@a,@sub); |
29 | for ($i = 0; ($p,$f,$l,$s,$h,$w) = caller($i); $i++) { |
30 | @a = @DB'args; |
31 | for (@a) { |
32 | if (/^StB\000/ && length($_) == length($_main{'_main'})) { |
33 | $_ = sprintf("%s",$_); |
34 | } |
35 | else { |
36 | s/'/\\'/g; |
37 | s/([^\0]*)/'$1'/ unless /^-?[\d.]+$/; |
38 | s/([\200-\377])/sprintf("M-%c",ord($1)&0177)/eg; |
39 | s/([\0-\37\177])/sprintf("^%c",ord($1)^64)/eg; |
40 | } |
41 | } |
42 | $w = $w ? '@ = ' : '$ = '; |
43 | $a = $h ? '(' . join(', ', @a) . ')' : ''; |
44 | push(@sub, "$w&$s$a from file $f line $l\n"); |
45 | } |
46 | for ($i=0; $i <= $#sub; $i++) { |
47 | print $sub[$i]; |
48 | } |
49 | exit 1; |
50 | } |
51 | |
52 | 1; |