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https://github.com/Infinidat/infi.clickhouse_orm.git
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91 lines
2.9 KiB
Python
91 lines
2.9 KiB
Python
import sys
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from colorama import init, Fore, Back, Style
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from nltk.stem.porter import PorterStemmer
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from infi.clickhouse_orm import Database, F
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from models import Fragment
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from load import trim_punctuation
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# The wildcard character
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WILDCARD = '*'
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def prepare_search_terms(text):
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'''
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Convert the text to search into a list of stemmed words.
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'''
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stemmer = PorterStemmer()
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stems = []
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for word in text.split():
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if word == WILDCARD:
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stems.append(WILDCARD)
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else:
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stems.append(stemmer.stem(trim_punctuation(word)))
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return stems
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def build_query(db, stems):
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'''
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Returns a queryset instance for finding sequences of Fragment instances
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that matche the list of stemmed words.
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'''
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# Start by searching for the first stemmed word
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all_fragments = Fragment.objects_in(db)
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query = all_fragments.filter(stem=stems[0]).only(Fragment.document, Fragment.idx)
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# Add the following words to the queryset
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for i, stem in enumerate(stems):
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# Skip the first word (it's already in the query), and wildcards
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if i == 0 or stem == WILDCARD:
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continue
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# Create a subquery that finds instances of the i'th word
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subquery = all_fragments.filter(stem=stem).only(Fragment.document, Fragment.idx)
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# Add it to the query, requiring that it will appear i places away from the first word
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query = query.filter(F.isIn((Fragment.document, Fragment.idx + i), subquery))
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# Sort the results
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query = query.order_by(Fragment.document, Fragment.idx)
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return query
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def get_matching_text(db, document, from_idx, to_idx, extra=5):
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'''
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Reconstructs the document text between the given indexes (inclusive),
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plus `extra` words before and after the match. The words that are
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included in the given range are highlighted in green.
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'''
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text = []
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conds = (Fragment.document == document) & (Fragment.idx >= from_idx - extra) & (Fragment.idx <= to_idx + extra)
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for fragment in Fragment.objects_in(db).filter(conds).order_by('document', 'idx'):
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word = fragment.word
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if fragment.idx == from_idx:
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word = Fore.GREEN + word
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if fragment.idx == to_idx:
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word = word + Style.RESET_ALL
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text.append(word)
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return ' '.join(text)
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def find(db, text):
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'''
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Performs the search for the given text, and prints out the matches.
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'''
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stems = prepare_search_terms(text)
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query = build_query(db, stems)
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print('\n' + Fore.MAGENTA + str(query) + Style.RESET_ALL + '\n')
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for match in query:
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text = get_matching_text(db, match.document, match.idx, match.idx + len(stems) - 1)
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print(Fore.CYAN + match.document + ':' + Style.RESET_ALL, text)
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if __name__ == '__main__':
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# Initialize colored output
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init()
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# Initialize database
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db = Database('default')
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# Search
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text = ' '.join(sys.argv[1:])
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if text:
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find(db, text)
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