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Some consumers have reported difficulty parsing an uncommon YAML construction [1] [2] [3]. Extend the linter to help ensure that construction is not used in future contributions. [1] https://github.com/tc39/test262/issues/1997 [2] https://github.com/tc39/test262/pull/2505 [3] https://github.com/tc39/test262/issues/3171
34 lines
955 B
Python
34 lines
955 B
Python
import re
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import yaml
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class Result(dict):
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def __init__(self, meta, events):
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self.parsing_events = events
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super(Result, self).__init__(**meta)
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class MyLoader(yaml.SafeLoader):
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events = None
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def __init__(self, *args, **kwargs):
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MyLoader.events = []
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super(MyLoader, self).__init__(*args, **kwargs)
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def get_event(self):
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event = super(MyLoader, self).get_event()
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MyLoader.events.append(event)
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return event
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def parse(src):
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'''Parse the YAML-formatted metadata found in a given string of source
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code. Tolerate missing or invalid metadata; those conditions are handled by
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a dedicated "Check" instance.'''
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match = re.search(r'/\*---(.*)---\*/', src, re.DOTALL)
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if not match:
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return None
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try:
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return Result(yaml.load(match.group(1), MyLoader), MyLoader.events)
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except (yaml.scanner.ScannerError, yaml.parser.ParserError):
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return None
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