104 lines
3.7 KiB
Python
104 lines
3.7 KiB
Python
"""
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This file contains all the functions to extract DOIs of citations from
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plaintext files.
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"""
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import os
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import requests
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from requests.exceptions import RequestException
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from libbmc import doi
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from libbmc import tools
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from libbmc.repositories import arxiv
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# CrossRef API URL
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CROSSREF_LINKS_API_URL = "http://search.crossref.org/links"
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CROSSREF_MAX_BATCH_SIZE = 10
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def get_plaintext_citations(file):
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"""
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Parse a plaintext file to get a clean list of plaintext citations. The \
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file should have one citation per line.
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:param file: Either the path to the plaintext file or the content of a \
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plaintext file.
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:returns: A list of cleaned plaintext citations.
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"""
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# Handle path or content
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if os.path.isfile(file):
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with open(file, 'r') as fh:
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content = fh.readlines()
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else:
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content = file.splitlines()
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# Clean every line to have plaintext
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cleaned_citations = [tools.clean_whitespaces(line) for line in content]
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return cleaned_citations
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def get_cited_dois(file):
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"""
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Get the DOIs of the papers cited in a plaintext file. The file should \
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have one citation per line.
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.. note::
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This function is also used as a backend tool by most of the others \
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citations processors, to factorize the code.
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:param file: Either the path to the plaintext file or the content of a \
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plaintext file. It can also be a parsed list of plaintext \
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citations and, in this case, no preprocessing is done.
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:returns: A dict of cleaned plaintext citations and their associated DOI.
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"""
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# If file is not a pre-processed list of plaintext citations
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if not isinstance(file, list):
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# It is either a path to a plaintext file or the content of a plaintext
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# file, we need some pre-processing to get a list of citations.
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plaintext_citations = get_plaintext_citations(file)
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else:
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# Else, we passed a list of plaintext citations.
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plaintext_citations = file
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dois = {}
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crossref_queue = []
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# Try to get the DOI directly from the citation
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for citation in plaintext_citations[:]:
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# Some citations already contain a DOI so try to match it directly
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matched_dois = doi.extract_from_text(citation)
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if len(matched_dois) > 0:
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# Add the DOI and go on
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dois[citation] = next(iter(matched_dois))
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continue
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# Same thing for arXiv id
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matched_arxiv = arxiv.extract_from_text(citation)
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if len(matched_arxiv) > 0:
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# Add the associated DOI and go on
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dois[citation] = arxiv.to_doi(next(iter(matched_arxiv)))
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continue
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# If no match found, stack it for next step
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# Note to remove URLs in the citation as the plaintext citations can
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# contain URLs and they are bad for the CrossRef API.
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crossref_queue.append(tools.remove_urls(citation))
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# Do batch with remaining papers, to prevent from the timeout of CrossRef
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for batch in tools.batch(crossref_queue, CROSSREF_MAX_BATCH_SIZE):
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batch = [i for i in batch]
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try:
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# Fetch results from CrossRef
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request = requests.post(CROSSREF_LINKS_API_URL, json=batch)
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for result in request.json()["results"]:
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# Try to get a DOI
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try:
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dois[result["text"]] = result["doi"]
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except KeyError:
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# Or set it to None
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dois[result["text"]] = None
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except (RequestException, ValueError, KeyError):
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# If an exception occurred, set all the DOIs to None for the
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# current batch
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for i in batch:
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dois[i] = None
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return dois
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