Ticket #69 (closed defect: invalid)

Opened 7 years ago

Last modified 5 months ago

scalar value of escaped double-newline parsed as a single newline

Reported by: anonymous Owned by: xi
Priority: normal Component: libyaml
Severity: normal Keywords:


When parsing the following: terminator : "\n\n"

The value of the right side scalar is returned as \n, rather than \n\n. Likewise, four newlines ("\n\n\n\n") is parsed as three ("\n\n\n").


yaml_test.tar.gz Download (75.0 KB) - added by anonymous 7 years ago.
Here is a code example that illustrates the problem. Look at the 3 newlines following the 'terminator' scalar. They end up being returned as 2 newlines.

Change History

comment:1 Changed 7 years ago by xi

It works fine for me both with pure Python PyYAML and LibYAML bindings:

>>> import yaml
>>> yaml.load(r'terminator : "\n\n"')
{'terminator': '\n\n'}
>>> yaml.load(r'terminator : "\n\n"', Loader=yaml.CLoader)
{'terminator': '\n\n'}

Could you post a code snippet and a YAML file that produce the problem?

Changed 7 years ago by anonymous

Here is a code example that illustrates the problem. Look at the 3 newlines following the 'terminator' scalar. They end up being returned as 2 newlines.

comment:2 Changed 7 years ago by xi

  • Status changed from new to closed
  • Resolution set to invalid

Is \n in your examples a new line character or just two symbols: \ and n? PyYAML and LibYAML handle these cases differently:

>>> import yaml
>>> yaml.load('"\n\n"') # two new line characters
>>> yaml.load(r'"\n\n"') # four characters: \ n \ n

In the both cases, PyYAML output is correct, see  http://yaml.org/spec/cvs/current.html#line%20folding/ and  http://yaml.org/spec/cvs/current.html#ns-esc-char.

When N(>1) subsequent new line characters occur in a flow scalar, they are "folded" into N-1 new line characters. A single new line character is replaced with space.

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comment:13 Changed 5 months ago by liwa <dirosie46@…>

The second issue is that the emitter escapes non-ASCII characters even when all characters are printable (according to 'c-printable' in the YAML spec) when using an encoding (UTF8) that supports such characters. I don't find this as elegant as could be. Instead of the "Fran\xE7ais" output above, I would have hoped for the UTF8-encoded byte string Fran\xc3\xa7ais\n.

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