Ticket #140 (new defect)

Opened 8 years ago

Last modified 3 years ago

Plain equal sign (=) as node content results in an error

Reported by: pyyaml@… Owned by: xi
Priority: normal Component: pyyaml
Severity: normal Keywords:


A plain equal sign (=) as node fails as invalid YAML.


Load this document



A plain equal sign used as anything other than a key should be the String type (tag:yaml.org,2002:str).

The above document should result in this canonical document:

%YAML 1.1
!!str "="

With this node structure:

ScalarNode(tag=u'tag:yaml.org,2002:str', value=u'=')

That is it should have been equivalent to this document:



Attempts to treat equal sign as the  Value Key type (tag:yaml.org,2002:value) and throws this error:

The document is not valid YAML:
could not determine a constructor for the tag 'tag:yaml.org,2002:value'
  in "", line 1, column 1:


Here's an example of equal sign correctly being treated as the Value Key type:

= : 1

Producing this canonical document and node:

%YAML 1.1
!!map {
    ? !!str "="
    : !!int "1",
MappingNode(tag=u'tag:yaml.org,2002:map', value=[(ScalarNode(tag=u'tag:yaml.org,2002:value', value=u'='),
 ScalarNode(tag=u'tag:yaml.org,2002:int', value=u'1'))])

The document in STEPS TO REPRODUCE is the simplest document that fails, but these documents also fail:

- =
a: =

Change History

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