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use v6;
use Test;
plan 32;
# L<S05/Grammars/"Like classes, grammars can inherit">
# tests namespace, inheritance and override
grammar Grammar::Foo {
token TOP { <foo> };
token foo { 'foo' };
token so { 'so' };
};
#?rakudo todo 'RT #77350'
is( try { Grammar::Foo.parse( 'so', :rule<so> ) }, 'so',
"don't let a Mu based action method fail the parse" );
is(~('foo' ~~ /^<Grammar::Foo::foo>$/), 'foo', 'got right match (foo)');
ok Grammar::Foo.parse('foo'), 'got the right match through .parse TOP';
ok Grammar::Foo.parse('foo', :rule<foo>), 'got the right match through .parse foo';
grammar Grammar::Bar is Grammar::Foo {
token TOP { <any> };
token bar { 'bar' };
token any { <foo> | <bar> };
};
isa-ok Grammar::Foo, Grammar, 'grammar isa Grammar';
isa-ok Grammar::Bar, Grammar, 'inherited grammar still isa Grammar';
isa-ok Grammar::Bar, Grammar::Foo, 'child isa parent';
is(~('bar' ~~ /^<Grammar::Bar::bar>$/), 'bar', 'got right match (bar)');
is(~('foo' ~~ /^<Grammar::Bar::foo>$/), 'foo', 'got right match (foo)');
is(~('foo' ~~ /^<Grammar::Bar::any>$/), 'foo', 'got right match (any)');
is(~('bar' ~~ /^<Grammar::Bar::any>$/), 'bar', 'got right match (any)');
ok Grammar::Bar.parse('foo'), 'can parse foo through .parsed and inherited subrule';
ok Grammar::Bar.parse('bar', :rule<bar>), 'got right match (bar)';
ok Grammar::Bar.parse('foo', :rule<foo>), 'got right match (foo)';
ok Grammar::Bar.parse('bar', :rule<any>), 'got right match (any)';
ok Grammar::Bar.parse('foo', :rule<any>), 'got right match (any)';
nok Grammar::Bar.parse('boo', :rule<any>), 'No match for bad input (any)';
grammar Grammar::Baz is Grammar::Bar {
token baz { 'baz' };
token any { <foo> | <bar> | <baz> };
};
is(~('baz' ~~ /^<Grammar::Baz::baz>$/), 'baz', 'got right match');
is(~('foo' ~~ /^<Grammar::Baz::foo>$/), 'foo', 'got right match');
is(~('bar' ~~ /^<Grammar::Baz::bar>$/), 'bar', 'got right match');
is(~('foo' ~~ /^<Grammar::Baz::any>$/), 'foo', 'got right match');
is(~('bar' ~~ /^<Grammar::Baz::any>$/), 'bar', 'got right match');
is(~('baz' ~~ /^<Grammar::Baz::any>$/), 'baz', 'got right match');
ok Grammar::Baz.parse('baz', :rule<baz>), 'got right match (baz)';
ok Grammar::Baz.parse('foo', :rule<foo>), 'got right match (foo)';
ok Grammar::Baz.parse('bar', :rule<bar>), 'got right match (bar)';
ok Grammar::Baz.parse('baz', :rule<any>), 'got right match (any)';
ok Grammar::Baz.parse('foo', :rule<any>), 'got right match (any)';
ok Grammar::Baz.parse('bar', :rule<any>), 'got right match (any)';
nok Grammar::Baz.parse('boo', :rule<any>), 'No match for bad input (any)';
{
class A { };
grammar B is A { };
#?rakudo todo 'automatic Grammar superclass'
isa-ok B, Grammar, 'A grammar isa Grammar, even if inherting from a class';
}
is(Grammar.WHAT.gist,"(Grammar)", "Grammar.WHAT.gist = Grammar()");
# vim: ft=perl6