106 lines
3.1 KiB
Python
106 lines
3.1 KiB
Python
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# abx_fallback.py
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"""
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Fallback parser used in case others fail.
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The fallback parser makes only a very minimal and robust set of assumptions.
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Any legal filename will successfully return a simple parse, though much
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interpretation may be lost. It still allows for common field-based practices,
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but falls back on using the unaltered filename if necessary.
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"""
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import re, os
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import yaml
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from . import registered_parser
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DEFAULT_YAML = {}
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with open(os.path.join(os.path.dirname(__file__), '..', 'abx.yaml')) as def_yaml_file:
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DEFAULT_YAML.update(yaml.safe_load(def_yaml_file))
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@registered_parser
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class Parser_ABX_Fallback(object):
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"""
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Highly-tolerant parser to fall back on if others fail.
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Makes very minimal assumptions about filename structure.
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YAML options available:
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---
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definitions:
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parser: abx_fallback # Force use of this parser.
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There are no other options. Field separators are defined very broadly,
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and include most non-word characters (~#$!=+&_-). This was mostly designed
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to work without a project schema available.
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"""
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name = 'abx_fallback'
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filetypes = DEFAULT_YAML['definitions']['filetypes']
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roles = DEFAULT_YAML['definitions']['roles']
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roles_by_filetype = (
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DEFAULT_YAML['definitions']['roles_by_filetype'])
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main_sep_re = re.compile(r'\W+') # Any single non-word char
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comment_sep_re = re.compile(r'[\W_][\W_]+|[~#$!=+&]+')
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def __init__(self, **kwargs):
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pass
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def _parse_ending(self, filename, separator):
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try:
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remainder, suffix = filename.rsplit(separator, 1)
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score = 1.0
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except ValueError:
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remainder = filename
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suffix = None
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score = 0.0
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return (suffix, remainder, score)
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def __call__(self, filename, namepath):
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fields = {}
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score = 1.0
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possible = 4.5
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split = filename.rsplit('.', 1)
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if len(split)<2 or split[1] not in self.filetypes:
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fields['filetype'] = None
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remainder = filename
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score += 1.0
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else:
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fields['filetype'] = split[1]
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remainder = split[0]
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comment_match = self.comment_sep_re.search(remainder)
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if comment_match:
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fields['comment'] = remainder[comment_match.end():]
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remainder = remainder[:comment_match.start()]
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else:
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fields['comment'] = None
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role = self.main_sep_re.split(remainder)[-1]
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if role in self.roles:
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fields['role'] = role
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remainder = remainder[:-1-len(role)]
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score += 1.0
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else:
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fields['role'] = None
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# Implied role
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if fields['filetype'] in self.roles_by_filetype:
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fields['role'] = self.roles_by_filetype[fields['filetype']]
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score += 1.0
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words = self.main_sep_re.split(remainder)
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fields['code'] = ''.join([w.capitalize() for w in words])
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fields['title'] = remainder
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return score/possible, fields
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