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package Perl::ToPerl6::Transformer::Variables::FormatHashKeys; |
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use 5.006001; |
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use strict; |
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use warnings; |
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use Readonly; |
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use Perl::ToPerl6::Utils qw{ :characters :severities }; |
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use base 'Perl::ToPerl6::Transformer'; |
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our $VERSION = '0.03'; |
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#----------------------------------------------------------------------------- |
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Readonly::Scalar my $DESC => q{Transform %x{a} to %x{'a'}}; |
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Readonly::Scalar my $EXPL => |
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q{Perl6 assumes that braces are code blocks, so any content must be compilable}; |
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#----------------------------------------------------------------------------- |
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sub supported_parameters { return () } |
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sub default_severity { return $SEVERITY_HIGHEST } |
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sub default_themes { return qw(core bugs) } |
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sub applies_to { |
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return sub { |
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$_[1]->isa('PPI::Structure::Subscript') and |
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$_[1]->start->content eq '{' and |
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$_[1]->finish->content eq '}' and |
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( $_[1]->sprevious_sibling->isa('PPI::Token::Symbol') or |
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$_[1]->sprevious_sibling->isa('PPI::Token::Operator') ) and |
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not $_[1]->schild(0)->schild(0)->isa('PPI::Token::Quote') |
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} |
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} |
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#----------------------------------------------------------------------------- |
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sub transform { |
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my ($self, $elem, $doc) = @_; |
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my $token = $elem; |
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while ( $token and |
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$token->isa('PPI::Structure::Subscript') ) { |
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if ( $token->start and |
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$token->start->content eq '{' ) { |
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my $bareword = $token->schild(0)->schild(0); |
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my $old_content = $bareword->content; |
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$old_content =~ s{'}{\\'}g; |
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my $new_content = "'" . $old_content . "'"; |
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$bareword->insert_after( |
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PPI::Token::Quote::Single->new($new_content) |
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); |
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$bareword->delete; |
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} |
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$token = $token->snext_sibling; |
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} |
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return $self->transformation( $DESC, $EXPL, $elem ); |
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} |
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1; |
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#----------------------------------------------------------------------------- |
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__END__ |
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=pod |
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=head1 NAME |
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Perl::ToPerl6::Transformer::Variables::FormatHashKeys - Transform bareword hash keys into quoted hash keys |
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=head1 AFFILIATION |
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This Transformer is part of the core L<Perl::ToPerl6|Perl::ToPerl6> |
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distribution. |
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=head1 DESCRIPTION |
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Anything enclosed in braces should be compilable code in Perl6, and unfortunately bareword hash keys such as C<%foo{a}> are interpreted as C<%foo{a()}>, so when the function a() can't be found, the block fails to compile: |
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%foo{a} --> %foo{'a'} |
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%foo{'a'} --> %foo{'a'} |
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Using angle brackets as in C<< %foo<a> >> would be more Perl6 style, but this is a change that most people will immediately understand. |
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Transforms variables outside of comments, heredocs, strings and POD. |
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=head1 CONFIGURATION |
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This Transformer is not configurable except for the standard options. |
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=head1 AUTHOR |
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Jeffrey Goff <drforr@pobox.com> |
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=head1 COPYRIGHT |
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Copyright (c) 2015 Jeffrey Goff |
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This program is free software; you can redistribute it and/or modify |
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it under the same terms as Perl itself. |
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108
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=cut |
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############################################################################## |
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# Local Variables: |
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# mode: cperl |
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# cperl-indent-level: 4 |
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# fill-column: 78 |
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# indent-tabs-mode: nil |
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# c-indentation-style: bsd |
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# End: |
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# ex: set ts=8 sts=4 sw=4 tw=78 ft=perl expandtab shiftround : |