karenetheridge
commented
2 years ago YAML documents and parsers, like Perl, don't generally distinguish between scalar types. For example, when parsing { foo: 1 } YAML::XS sets the POK flag, while JSON::XS does not.
This is a known shortcoming of that parser which I believe is actively being looked into and fixed. YAML::PP is actually type-correct, which is why I use it in all my applications that use JSON Schema with YAML documents:
my $schema = YAML::PP->new(boolean => 'JSON::PP')->load_string($yaml_text);
# or:
my $schema = YAML::PP->new(boolean => 'JSON::PP')->load_file($filename);
mjcarman
It would be very useful to have a "relaxed" mode for type validation that isn't strictly tied to perl's POK/IOK/NOK flags. Users shouldn't be required to have that level of understanding about the Perl internals. Even for users who do have that depth of knowledge, managing those flags is difficult, error prone, and unlikely to be necessary for consuming data. (Using those flags may be necessary for producing data, though in that case I'd rather be able to use the schema to set the flags so it gets serialized properly.)
Desired behavior:
type: number→ passes ifScalar::Util::looks_like_number($value)type: integer→ passes ifScalar::Util::looks_like_number($value) && $value == int($value)type: string→ passes ifdefined($value) && !ref($value)Context: I'm attempting to use JSON Schema with YAML documents, since YAML doesn't have a way to define and validate schemas that's standardized, widespread, and/or actively maintained. As JSON is a subset of YAML, it should be possible to use JSON schema for (typical) YAML documents. YAML documents and parsers, like Perl, don't generally distinguish between scalar types. For example, when parsing
{ foo: 1 }YAML::XS sets the POK flag, while JSON::XS does not. This impedance mismatch makes it difficult to use this module, as I have to walk the parsed data and do$x += 0or$value .= ''(with a lot of surrounding guard checks) to set the flags the way the validator wants them. Even then, simply printing a value will set the POK flag and can cause validation to fail.