Error on optional string escapes in input, even though valid in JSON

[chaimleib]

Describe the bug
According to the JSON spec (YAML is a superset of JSON), YAML 1.2.2, and YAML 1.3.0, "\/" is valid string syntax, equivalent to "/".

However, when "\/" exists on the input to yq, the escaped character is not recognized.

Version of yq: 4.13.3
Operating system: mac
Installed via: go install github.com/mikefarah/yq/v4@v4.13.3 under go1.17.2 darwin/amd64

Input

test.yml

["\/"]

Command
The command you ran:

yq e '.[0]' test.yml

Actual behavior

Error: yaml: found unknown escape character

Expected behavior

/

Additional context

Optional escapes on input strings work fine with jq-1.6:

% jq -r '.[0]' test.yml
/

[mikefarah]

This is an issue with the underlying go-yaml parser - please raise the issue there: https://github.com/go-yaml/yaml

FWIW I created a playground example of your bug: https://play.golang.org/p/QNulMRqLfVx

[chaimleib]

Thanks! I created an issue there:
go-yaml/yaml/issues/797

[balki]

Ran into this issue today. When yq knows the input is json, it works correctly.

❯ cat one.json         
{
    "foo":"App\/3.2.7"
}
❯ yq one.json
{
  "foo": "App/3.2.7"
}
❯ cat one.json | yq   
Error: bad file '-': yaml: line 2: found unknown escape character
❯ cat one.json | yq -pj
foo: App/3.2.7

Looks like upstream go-yaml has been abandoned. @mikefarah Any plans to do move to different yaml lib or maintain a fork ?