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Ticket Resolution Summary Owner Reporter
#50 fixed ScannerError TypeError xi edemaine@…

Reported by edemaine@…, 7 years ago.

Description

I encountered a small bug in error reporting with the libyaml interface:

## A "real-world" example: mistaken input HTML instead of YAML.
>>> x='<HTML>\n  <HEAD>\n    <STYLE>\n      TABLE { border-collapse: collapse; }\n    </STYLE>\n  </HEAD>\n</HTML>'

>>> yaml.load(x)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/toc/home/edemaine/Packages/lib/python2.6/site-packages/yaml/__init__.py", line 66, in load
    return loader.get_data()
  File "/toc/home/edemaine/Packages/lib/python2.6/site-packages/yaml/constructor.py", line 38, in get_data
    return self.construct_document(self.get_node())
  File "/toc/home/edemaine/Packages/lib/python2.6/site-packages/yaml/composer.py", line 27, in get_node
    return self.compose_document()
  File "/toc/home/edemaine/Packages/lib/python2.6/site-packages/yaml/composer.py", line 37, in compose_document
    self.get_event()
  File "/toc/home/edemaine/Packages/lib/python2.6/site-packages/yaml/parser.py", line 115, in get_event
    self.current_event = self.state()
  File "/toc/home/edemaine/Packages/lib/python2.6/site-packages/yaml/parser.py", line 186, in parse_document_end
    token = self.peek_token()
  File "/toc/home/edemaine/Packages/lib/python2.6/site-packages/yaml/scanner.py", line 128, in peek_token
    self.fetch_more_tokens()
  File "/toc/home/edemaine/Packages/lib/python2.6/site-packages/yaml/scanner.py", line 220, in fetch_more_tokens
    return self.fetch_value()
  File "/toc/home/edemaine/Packages/lib/python2.6/site-packages/yaml/scanner.py", line 579, in fetch_value
    self.get_mark())
yaml.scanner.ScannerError: mapping values are not allowed here
  in "<string>", line 4, column 30:
          TABLE { border-collapse: collapse; }
                                 ^
## great error reporting

>>> yaml.load(x,yaml.CLoader)                                                   Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/toc/home/edemaine/Packages/lib/python2.6/site-packages/yaml/__init__.py", line 66, in load
    return loader.get_data()
  File "/toc/home/edemaine/Packages/lib/python2.6/site-packages/yaml/constructor.py", line 38, in get_data
    return self.construct_document(self.get_node())
  File "_yaml.pyx", line 664, in _yaml.CParser.get_node
  File "_yaml.pyx", line 669, in _yaml.CParser._compose_document
  File "_yaml.pyx", line 848, in _yaml.CParser._parse_next_event
TypeError: exceptions must be strings, classes, or instances, not ScannerError
## not so useful--seems to be a bug

I didn't investigate why ScannerError is considered to be a class in the first case but not the second; perhaps _yaml defines its own ScannerError? type? Should probably just use yaml.scanner.ScannerError instead.

#51 fixed Won't emit a document until the next document is available xi edward@…

Reported by edward@…, 7 years ago.

Description

parse_document_end won't emit an event until it has seen the next token after the document end. This makes it difficult to use PyYAML to parse live streams of documents in a timely way, because the next document may not actually be available for some undetermined amount of time.

Using PyYAML-3.04.

#18 worksforme [bug] nested dictionnary load works dump doesn't xi eugene@…

Reported by eugene@…, 8 years ago.

Description
import yaml
data=yaml.load("""
a: 1
b:
    ba: 1
    bb: 2
""")
yaml.dump(data)

[gives]

 'a: 1\nb: {ba: 1, bb: 2}\n'

pyYaml 3.0.3 - Python 2.4.3 - Windows XP

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