CODEWITHSUNDEEP
anchoryaml
user2790799
user2790799

Reputation: 201

Exporting anchors across YAML files

--- #File A
  - Lunch: &01
        - Chicken
        - Rice
        - Sallad
...

--- #File B
  - Monday: *01
  - Tuesday: *01
...

For example File A is in C:drive in my PC and File B is in D:drive.

How can I export the anchors Using YAML?

Upvotes: 20

Views: 12815

Answers (2)

lrsppp
lrsppp

Reputation: 1373

I used a workaround by creating a suitable constructor to import values from other YAML files:

# defaults.yaml
values:
  a: 5

# config.yaml
test1:
  - !r defaults.yaml#values.a

test2: !r defaults.yaml#values.a

test3: !r defaults.yaml#values

Parsing using pyyaml:

import yaml


def get_nested_value(data, path):
    keys = path.split(".")
    current_value = data
    for key in keys:
        current_value = current_value.get(key)
        if current_value is None:
            return None
    return current_value


def read_constructor(loader, node):
    fn, path = node.value.split("#")
    with open(fn, "r") as f:
        data = yaml.load(f, Loader=yaml.SafeLoader)
    return get_nested_value(data, path)


Loader = yaml.SafeLoader
Loader.add_constructor("!r", read_constructor)

if __name__ == "__main__":
    fn = "config.yaml"
    with open(fn, "r") as f:
        config = yaml.load(f, Loader=Loader)

    print(config)

Output:

{'test1': [5], 'test2': 5, 'test3': {'a': 5}}

This is not 100% related to your questions, but it is an easy way to import values from files (path are defined relative to your target YAML file).

Upvotes: 1

MrBackend
MrBackend

Reputation: 667

You can't share anchors/aliases between documents; Chapter 9.1 of the YAML 1.2 spec explicitly states that each document is completely independent.

Upvotes: 22

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