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Use parent ::Match grammar in ::SubMatch #5

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Use parent ::Match grammar in ::SubMatch #5

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7 changes: 5 additions & 2 deletions lib/Babble/Match.pm
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Original file line number Diff line number Diff line change
Expand Up @@ -8,8 +8,11 @@ use re 'eval';
ro 'top_rule';
rwp 'text';

lazy 'grammar' => sub { Babble::Grammar->new }
=> handles => [ 'grammar_regexp' ];
lazy 'grammar' => sub {
$_[0]->can('parent')
? $_[0]->parent->grammar
: Babble::Grammar->new
} => handles => [ 'grammar_regexp' ];

lazy 'symbol_generator' => sub {
$_[0]->can('parent')
Expand Down
93 changes: 93 additions & 0 deletions t/submatch-rule.t
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Original file line number Diff line number Diff line change
@@ -0,0 +1,93 @@
use strictures 2;
use Test::More;
use Babble::Match;

{
package # hide from PAUSE
ClassKeyword;

use Moo;

sub extend_grammar {
my ($self, $g) = @_;
$g->add_rule(ClassExtends => q{
extends (?&PerlOWS) (?&PerlQualifiedIdentifier)
});
$g->add_rule(RolesList => q{
(?&PerlQualifiedIdentifier)
(?: (?&PerlOWS) , (?&PerlOWS) (?&PerlQualifiedIdentifier) )*?
});
$g->add_rule(ClassRoles => q{
with (?&PerlOWS) (?&PerlRolesList)
});
$g->add_rule(ClassDef => q{
class (?&PerlOWS) (?&PerlQualifiedIdentifier)
(?: (?&PerlOWS) (?&PerlClassExtends) )?
(?: (?&PerlOWS) (?&PerlClassRoles) )?
(?&PerlOWS)
(?&PerlBlock)
});
$g->augment_rule(Keyword => '(?&PerlClassDef)');
}

sub transform_to_plain {
my ($self, $top) = @_;
$top->each_match_within(Keyword => [
[ kw => 'class(?&PerlOWS)'],
[ name => '(?&PerlQualifiedIdentifier)'],
[ extends => '(?: (?&PerlOWS) (?&PerlClassExtends) )?' ],
[ roles => '(?: (?&PerlOWS) (?&PerlClassRoles) )?' ],
[ space => '(?&PerlOWS)' ],
[ block => '(?&PerlBlock)' ],
] => sub {
my ($m) = @_;
my $gr = $m->grammar_regexp;
my ($kw, $name, $extends, $roles, $space, $block)
= @{$m->submatches}{qw(kw name extends roles space block)};

my $extends_text = $extends->text;
$extends_text =~ s/\A (?&PerlOWS) extends (?&PerlOWS) $gr//mx;

my $roles_text = $roles->text;
$roles_text =~ s/\A (?&PerlOWS) with (?&PerlOWS) $gr//mx;
my @roles = grep defined, split /(?:(?&PerlOWS)) , (?: (?&PerlOWS)) $gr/mx, $roles_text;

my $block_text = $block->text;
my $prefix = "package @{[ $name->text ]}; use Moo;";

$prefix .= " extends ".B::perlstring($extends_text). ";" if $extends_text;
$prefix .= " with ".join(", ", map B::perlstring($_), @roles). ";" if @roles;

$block_text =~ s/\{/{ $prefix/;
$_->replace_text('') for $kw, $name, $extends, $roles, $space;

$block->replace_text($block_text);
});
}
}

my @cand = (
[ 'class Foo::Bar { 42 }',
q|{ package Foo::Bar; use Moo; 42 }|, ],
[ 'class Baz extends Foo::Bar { 42 }',
q|{ package Baz; use Moo; extends "Foo::Bar"; 42 }|, ],
[ 'class Baz extends Foo with Foo::Role::Trackable { 42 }',
q|{ package Baz; use Moo; extends "Foo"; with "Foo::Role::Trackable"; 42 }|, ],
[ 'class Baz extends Foo with Trackable, Aliasable { 42 }',
q|{ package Baz; use Moo; extends "Foo"; with "Trackable", "Aliasable"; 42 }|, ],
);

my $ck = ClassKeyword->new;

my $g = Babble::Grammar->new;

$ck->extend_grammar($g);

foreach my $cand (@cand) {
my ($from, $to) = @$cand;
my $top = $g->match('Document' => $from);
$ck->transform_to_plain($top);
is($top->text, $to, "${from}");
}

done_testing;