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37 lines
990 B
37 lines
990 B
8 months ago
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"""Citation keys."""
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import re
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from typing import Iterable, NamedTuple
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class CitationTarget(NamedTuple):
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"""Citation key, pre-text, and post-text."""
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key: str
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pre: str
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post: str
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_re_citation_target = re.compile(
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r"\s*([{](?P<pre>[^{}]+)[}])?"
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r"\s*(?P<key>[^{}\s,]+)"
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r"\s*([{](?P<post>[^{}]+)[}])?\s*"
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)
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def parse_citation_targets(targets: str, pos=0) -> Iterable[CitationTarget]:
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"""Parse citation target string into a list of citation keys."""
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match = _re_citation_target.match(targets, pos=pos)
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if match is None:
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raise ValueError(f"malformed citation target: {targets}")
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yield CitationTarget(
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key=match.group("key") or "",
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pre=match.group("pre") or "",
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post=match.group("post") or "",
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)
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end = match.end()
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if end < len(targets):
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if targets[end] != ",":
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raise ValueError(f"malformed citation target: {targets}")
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yield from parse_citation_targets(targets, end + 1)
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