Ticket #204 (new defect)

Opened 6 years ago

Last modified 3 years ago

In pure-python implementation yaml.load cannot read files generated by yaml.dump/safe_dump when allow_unicode=True

Reported by: kpp.live@… Owned by: xi
Priority: high Component: pyyaml
Severity: normal Keywords:


Consider we're running:

Jython 2.5.1+ (Release_2_5_1, Aug 4 2010, 07:18:19) 
[OpenJDK 64-Bit Server VM (Sun Microsystems Inc.)] on java1.6.0_23
Type "help", "copyright", "credits" or "license" for more information.
>>> import yaml; yaml.__version__
>>> f = file('tmp.yaml', 'wb')
>>> yaml.dump(u'Even just latin in unicode', allow_unicode=True)
"!!python/unicode 'Even just latin in unicode'\n"
>>> yaml.dump(u'Even just latin in unicode', f, allow_unicode=True)
>>> f.close()
>>> f = file('tmp.yaml')
>>> yaml.load(f)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/share/jython/Lib/site-packages/yaml/__init__.py", line 69, in load
  File "/usr/share/jython/Lib/site-packages/yaml/loader.py", line 34, in __init__
  File "/usr/share/jython/Lib/site-packages/yaml/reader.py", line 85, in __init__
  File "/usr/share/jython/Lib/site-packages/yaml/reader.py", line 135, in determine_encoding
  File "/usr/share/jython/Lib/site-packages/yaml/reader.py", line 169, in update
  File "/usr/share/jython/Lib/site-packages/yaml/reader.py", line 143, in check_printable
yaml.reader.ReaderError: unacceptable character #x0000: special characters are not allowed
  in "tmp.yaml", position 16

In cpython (with yaml with c-extension) yaml.load works with this file.

Change History

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comment:4 Changed 3 years 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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