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Macro ancestors #3875

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merged 1 commit into from Mar 28, 2017
Merged

Macro ancestors #3875

merged 1 commit into from Mar 28, 2017

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david50407
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Solved #3871 .

After this PR, we can use #ancestors and #superclasses in macro to get the inherit chain of the type.

class Foo
  def self.ancestors
    {{@type.ancestors}}
  end
  def self.superclasses # returns all superclass (without includes)
    {{@type.superclasses}}
  end
end

module Bar; end
class FooBar < Foo
  include Bar
end

puts FooBar.ancestors #=> [Bar, Foo, Reference, Class]
puts FooBar.superclasses #=> [Foo, Reference, Class]

david50407
david50407 commented Jan 12, 2017
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src/compiler/crystal/types.cr
superclasses << klass
end
superclasses
end
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BTW, I don't know if add #superclasses here is okay because this is useless in the whole compiler...
Or maybe this should just go into src/compiler/crystal/macros/methods.cr (or I can just drop this commit of #superclasses)

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We already have superclass, I'm not sure we need superclasses —which doesn't exist in Ruby, by the way. Both for the compiler (not used) and for @type. We can already iterate from parent to parent if needed.

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@ysbaddaden ok then I'm going to remove the commit of superclasses, thanks for reviewing 😄

@david50407 david50407 changed the title Macro ancestors Macro ancestors/superclasses Jan 12, 2017
@david50407 david50407 changed the title Macro ancestors/superclasses Macro ancestors Jan 12, 2017
@david50407
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@ysbaddaden I removed the superclasses part 🎉

bcardiff
bcardiff requested changes Jan 16, 2017
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We would need some docs here https://github.com/crystal-lang/crystal/blob/master/src/compiler/crystal/macros.cr#L1466 so they are published at crystal api

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@bcardiff updated. thanks 😄

@Sija
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Sija commented Mar 24, 2017

Is this PR GTG?

@ysbaddaden ysbaddaden merged commit 857743a into crystal-lang:master Mar 28, 2017
@asterite asterite mentioned this pull request Oct 19, 2017
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@AmaiKinono AmaiKinono mentioned this pull request Nov 22, 2020
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@ysbaddaden ysbaddaden ysbaddaden approved these changes

@bcardiff bcardiff bcardiff approved these changes

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@david50407 @Sija @ysbaddaden @bcardiff @spalladino