Can't use anchor for anchor

[Inetov]

This YAML will fail:

test-list:
 - &1
   a: 1
   b: 2

 - &2 <<: *1

 - &3 <<: *1

 - <<: *2

‌

Replacing “2” to “1” in last line will fix it. Why?

I сhoose this priority because this functionality is needed for my project, but I can use “1” even though it is not convenient.

[Inetov]

@Andrey Somov буду рад диалогу на русском)

[Inetov]

it’s works here for example

[Andrey Somov]

I think you found a bug. It will not be easy to fix.

The problem is that the node “<<: *2” is parsed as scalar but it represents a mapping.

The same bug is in PyYAML.

[Inetov]

Maybe you can use another interpreter? I have found this comparison (if it can be helpful).

[Inetov]

more realistic example:

settings-list:
 - &1
   a: 1
   b: 2
   c: 3  #and many more params.

 - &2 <<: *1
   a: 11
   b: 22

 - &3 <<: *2
   c: 5


some-object:
 properties: *2

another-object:
 properties: *3

works as expected here

‌

[Andrey Somov]

What is “another interpreter“ ?

[Andrey Somov]

Please be aware that merging is very controversial feature.
It has been removed in the next spec. YAML 1.2 does not have the merge.

That is why the SnakeYAML Engine does not implement merging.

[Andrey Somov]

I added a test.

[Inetov]

What is “another interpreter“ ?

never mind, I was wrong.

‌

YAML 1.2 does not have the merge.

Here is how! I did not know.
Ok and how do I use anchors correctly?

‌

I added a test.

not understood. where?

[Andrey Somov]

Ok and how do I use anchors correctly?

you use them correctly. But you use merge tag “<<“ together with aliases. This tag is deprecated and removed in the next spec YAML 1.2

‌

not understood. where?

check the latest source code