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Diffstat (limited to 'Master/tlpkg/tlperl/lib/exceptions.pl')
-rw-r--r-- | Master/tlpkg/tlperl/lib/exceptions.pl | 64 |
1 files changed, 0 insertions, 64 deletions
diff --git a/Master/tlpkg/tlperl/lib/exceptions.pl b/Master/tlpkg/tlperl/lib/exceptions.pl deleted file mode 100644 index 8af64c8a1b6..00000000000 --- a/Master/tlpkg/tlperl/lib/exceptions.pl +++ /dev/null @@ -1,64 +0,0 @@ -warn "Legacy library @{[(caller(0))[6]]} will be removed from the Perl core distribution in the next major release. Please install it from the CPAN distribution Perl4::CoreLibs. It is being used at @{[(caller)[1]]}, line @{[(caller)[2]]}.\n"; - -# exceptions.pl -# tchrist@convex.com -# -# This library is no longer being maintained, and is included for backward -# compatibility with Perl 4 programs which may require it. -# This legacy library is deprecated and will be removed in a future -# release of perl. -# -# In particular, this should not be used as an example of modern Perl -# programming techniques. - -# Here's a little code I use for exception handling. It's really just -# glorified eval/die. The way to use use it is when you might otherwise -# exit, use &throw to raise an exception. The first enclosing &catch -# handler looks at the exception and decides whether it can catch this kind -# (catch takes a list of regexps to catch), and if so, it returns the one it -# caught. If it *can't* catch it, then it will reraise the exception -# for someone else to possibly see, or to die otherwise. -# -# I use oddly named variables in order to make darn sure I don't conflict -# with my caller. I also hide in my own package, and eval the code in his. -# -# The EXCEPTION: prefix is so you can tell whether it's a user-raised -# exception or a perl-raised one (eval error). -# -# --tom -# -# examples: -# if (&catch('/$user_input/', 'regexp', 'syntax error') { -# warn "oops try again"; -# redo; -# } -# -# if ($error = &catch('&subroutine()')) { # catches anything -# -# &throw('bad input') if /^$/; - -sub catch { - package exception; - local($__code__, @__exceptions__) = @_; - local($__package__) = caller; - local($__exception__); - - eval "package $__package__; $__code__"; - if ($__exception__ = &'thrown) { - for (@__exceptions__) { - return $__exception__ if /$__exception__/; - } - &'throw($__exception__); - } -} - -sub throw { - local($exception) = @_; - die "EXCEPTION: $exception\n"; -} - -sub thrown { - $@ =~ /^(EXCEPTION: )+(.+)/ && $2; -} - -1; |