[2.2][Yaml] Blank values should resolve to null

[igorw]

The following syntax was valid in 2.1, and should be valid according to the YAML spec:

db.options:
  password:
myproject.test:
  param2: "456"

However, since 2.2 this throws a Symfony\Component\Yaml\Exception\ParseException: Indentation problem in "file.yml" at line 2 (near "password:").

IMO this should be fixed. Or if the BC break was intentional, it should be documented.

[stof]

@igorw blank values are not valid in Yaml 1.2

[igorw]

Please point me to where this is mentioned. Unless I'm misunderstanding the spec, it should be allowed.

7.2. Empty Nodes states that:

{
  ? foo :°,
  °: bar,
}

Should resolve to:

%YAML 1.2
---
!!map {
  ? !!str "foo" : !!null "",
  ? !!null ""   : !!str "bar",
}

Where ° is an empty value.

[stof]

hmm, right.

Btw, the inline parser is inconsistent as it parses it as a string: https://github.com/symfony/symfony/blob/master/src/Symfony/Component/Yaml/Inline.php#L47

[pvolok]

working on it