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# You may distribute under the terms of either the GNU General Public License |
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# or the Artistic License (the same terms as Perl itself) |
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# |
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# (C) Paul Evans, 2021 -- leonerd@leonerd.org.uk |
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package Syntax::Keyword::Try::Deparse 0.28; |
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use v5.14; |
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use warnings; |
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use B qw( opnumber ); |
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require B::Deparse; |
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use constant { |
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OP_CUSTOM => opnumber('custom'), |
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OP_ENTER => opnumber('enter'), |
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OP_LINESEQ => opnumber('lineseq'), |
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}; |
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=head1 NAME |
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C - L support for L |
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=head1 DESCRIPTION |
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Loading this module will apply some hacks onto L that attempts to |
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provide deparse support for code which uses the syntax provided by |
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L. |
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=cut |
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my $orig_pp_leave; |
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{ |
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no warnings 'redefine'; |
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no strict 'refs'; |
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$orig_pp_leave = *{"B::Deparse::pp_leave"}{CODE}; |
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*{"B::Deparse::pp_leave"} = \&pp_leave; |
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} |
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sub pp_leave |
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{ |
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my $self = shift; |
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my ( $op ) = @_; |
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my $enter = $op->first; |
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100
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$enter->type == OP_ENTER or |
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return $self->$orig_pp_leave( @_ ); |
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my $body = $enter->sibling; |
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my $first = $body->first; |
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my $finally = ""; |
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100
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if( $body->type == OP_LINESEQ and $first->name eq "pushfinally" ) { |
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my $finally_cv = $first->sv; |
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$finally = "\nfinally " . $self->deparse_sub( $finally_cv ) . "\cK"; |
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$first = $first->sibling; |
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$first = $first->sibling while $first and $first->name eq "lineseq"; |
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# Jump over a scope op |
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if( $first->type == 0 ) { |
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$body = $first; |
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$first = $first->first; |
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} |
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} |
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if( $first->type == OP_CUSTOM and $first->name eq "catch" ) { |
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# This is a try/catch block |
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shift; |
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return $self->deparse( $body, @_ ) . $finally; |
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} |
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elsif( length $finally ) { |
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# Body is the remaining siblings. We'll have to do them all together |
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my $try = B::Deparse::scopeop( 1, $self, $body, 0 ); |
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return "try {\n\t$try\n\b}" . $finally; |
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} |
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return $orig_pp_leave->($self, @_); |
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} |
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sub B::Deparse::pp_catch |
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{ |
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my $self = shift; |
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my ( $op ) = @_; |
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my $tryop = $op->first; |
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my $catchop = $op->first->sibling; |
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my $try = $self->pp_leave($tryop, 0); |
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# skip the OP_SCOPE and dive into the OP_LINESEQ inside |
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# |
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# TODO: Try to detect the `catch my $e` variable, though that will be hard |
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# to dishtinguish from actual code that really does that |
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my $catch = $self->deparse($catchop->first, 0); |
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return "try {\n\t$try\n\b}\ncatch {\n\t$catch\n\b}\cK"; |
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} |
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=head1 TODO |
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Correctly handle typed dispatch cases |
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(C, C) |
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=cut |
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=head1 AUTHOR |
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Paul Evans |
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=cut |
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0x55AA; |