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pantoniou / libfyaml

Fully feature complete YAML parser and emitter, supporting the latest YAML spec and passing the full YAML testsuite.
MIT License
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libfyaml does not adhere to the yaml specification #29

Closed m-j-son closed 3 years ago

m-j-son commented 3 years ago

We found a case where libfyaml does not adhere to the yaml specification. We're storing ip addresses in a sequence, and one of the ip addresses is "::". That is a valid IPv6 address. A very short yaml file that's valid according to the specification is

---
- ::
...

libfyaml tries to parse the :: as a mapping. It should only be a mapping if there's a space after the last colon. libfyaml is in good company making this mistake. I've tried libyaml, ruby's yaml parser, and a number of online validators. Only one got it right:

https://yamlchecker.com/

pantoniou commented 3 years ago

OK, fixed. Talk about a really weird case.

Note that for the next spec revision this will be disallowed, because it's extremely weird, no?