mirror of
https://github.com/searxng/searxng.git
synced 2024-11-05 12:50:11 +01:00
295 lines
10 KiB
Python
295 lines
10 KiB
Python
import re
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from collections import defaultdict
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from operator import itemgetter
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from threading import RLock
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from urlparse import urlparse, unquote
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from searx.engines import engines
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CONTENT_LEN_IGNORED_CHARS_REGEX = re.compile(r'[,;:!?\./\\\\ ()-_]', re.M | re.U)
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WHITESPACE_REGEX = re.compile('( |\t|\n)+', re.M | re.U)
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# return the meaningful length of the content for a result
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def result_content_len(content):
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if isinstance(content, basestring):
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return len(CONTENT_LEN_IGNORED_CHARS_REGEX.sub('', content))
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else:
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return 0
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def compare_urls(url_a, url_b):
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# ignore www. in comparison
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if url_a.netloc.startswith('www.'):
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host_a = url_a.netloc.replace('www.', '', 1)
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else:
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host_a = url_a.netloc
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if url_b.netloc.startswith('www.'):
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host_b = url_b.netloc.replace('www.', '', 1)
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else:
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host_b = url_b.netloc
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if host_a != host_b or url_a.query != url_b.query or url_a.fragment != url_b.fragment:
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return False
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# remove / from the end of the url if required
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path_a = url_a.path[:-1]\
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if url_a.path.endswith('/')\
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else url_a.path
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path_b = url_b.path[:-1]\
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if url_b.path.endswith('/')\
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else url_b.path
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return unquote(path_a) == unquote(path_b)
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def merge_two_infoboxes(infobox1, infobox2):
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# get engines weights
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if hasattr(engines[infobox1['engine']], 'weight'):
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weight1 = engines[infobox1['engine']].weight
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else:
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weight1 = 1
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if hasattr(engines[infobox2['engine']], 'weight'):
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weight2 = engines[infobox2['engine']].weight
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else:
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weight2 = 1
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if weight2 > weight1:
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infobox1['engine'] = infobox2['engine']
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if 'urls' in infobox2:
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urls1 = infobox1.get('urls', None)
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if urls1 is None:
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urls1 = []
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for url2 in infobox2.get('urls', []):
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unique_url = True
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for url1 in infobox1.get('urls', []):
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if compare_urls(urlparse(url1.get('url', '')), urlparse(url2.get('url', ''))):
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unique_url = False
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break
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if unique_url:
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urls1.append(url2)
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infobox1['urls'] = urls1
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if 'img_src' in infobox2:
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img1 = infobox1.get('img_src', None)
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img2 = infobox2.get('img_src')
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if img1 is None:
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infobox1['img_src'] = img2
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elif weight2 > weight1:
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infobox1['img_src'] = img2
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if 'attributes' in infobox2:
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attributes1 = infobox1.get('attributes', None)
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if attributes1 is None:
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attributes1 = []
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infobox1['attributes'] = attributes1
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attributeSet = set()
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for attribute in infobox1.get('attributes', []):
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if attribute.get('label', None) not in attributeSet:
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attributeSet.add(attribute.get('label', None))
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for attribute in infobox2.get('attributes', []):
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if attribute.get('label', None) not in attributeSet:
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attributes1.append(attribute)
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if 'content' in infobox2:
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content1 = infobox1.get('content', None)
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content2 = infobox2.get('content', '')
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if content1 is not None:
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if result_content_len(content2) > result_content_len(content1):
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infobox1['content'] = content2
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else:
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infobox1['content'] = content2
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def result_score(result):
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weight = 1.0
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for result_engine in result['engines']:
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if hasattr(engines[result_engine], 'weight'):
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weight *= float(engines[result_engine].weight)
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occurences = len(result['positions'])
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return sum((occurences * weight) / position for position in result['positions'])
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class ResultContainer(object):
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"""docstring for ResultContainer"""
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def __init__(self):
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super(ResultContainer, self).__init__()
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self.results = defaultdict(list)
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self._merged_results = []
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self.infoboxes = []
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self.suggestions = set()
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self.answers = set()
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self._number_of_results = []
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self._ordered = False
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self.paging = False
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def extend(self, engine_name, results):
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for result in list(results):
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if 'suggestion' in result:
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self.suggestions.add(result['suggestion'])
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results.remove(result)
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elif 'answer' in result:
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self.answers.add(result['answer'])
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results.remove(result)
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elif 'infobox' in result:
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self._merge_infobox(result)
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results.remove(result)
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elif 'number_of_results' in result:
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self._number_of_results.append(result['number_of_results'])
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results.remove(result)
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if engine_name in engines:
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with RLock():
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engines[engine_name].stats['search_count'] += 1
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engines[engine_name].stats['result_count'] += len(results)
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if not results:
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return
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self.results[engine_name].extend(results)
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if not self.paging and engine_name in engines and engines[engine_name].paging:
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self.paging = True
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for i, result in enumerate(results):
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try:
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result['url'] = result['url'].decode('utf-8')
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except:
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pass
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position = i + 1
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self._merge_result(result, position)
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def _merge_infobox(self, infobox):
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add_infobox = True
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infobox_id = infobox.get('id', None)
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if infobox_id is not None:
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for existingIndex in self.infoboxes:
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if compare_urls(urlparse(existingIndex.get('id', '')), urlparse(infobox_id)):
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merge_two_infoboxes(existingIndex, infobox)
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add_infobox = False
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if add_infobox:
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self.infoboxes.append(infobox)
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def _merge_result(self, result, position):
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result['parsed_url'] = urlparse(result['url'])
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# if the result has no scheme, use http as default
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if not result['parsed_url'].scheme:
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result['parsed_url'] = result['parsed_url']._replace(scheme="http")
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result['url'] = result['parsed_url'].geturl()
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result['engines'] = [result['engine']]
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# strip multiple spaces and cariage returns from content
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if result.get('content'):
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result['content'] = WHITESPACE_REGEX.sub(' ', result['content'])
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# check for duplicates
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duplicated = False
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for merged_result in self._merged_results:
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if compare_urls(result['parsed_url'], merged_result['parsed_url'])\
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and result.get('template') == merged_result.get('template'):
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duplicated = merged_result
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break
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# merge duplicates together
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if duplicated:
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# using content with more text
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if result_content_len(result.get('content', '')) >\
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result_content_len(duplicated.get('content', '')):
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duplicated['content'] = result['content']
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# add the new position
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duplicated['positions'].append(position)
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# add engine to list of result-engines
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duplicated['engines'].append(result['engine'])
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# using https if possible
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if duplicated['parsed_url'].scheme != 'https' and result['parsed_url'].scheme == 'https':
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duplicated['url'] = result['parsed_url'].geturl()
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duplicated['parsed_url'] = result['parsed_url']
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# if there is no duplicate found, append result
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else:
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result['positions'] = [position]
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with RLock():
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self._merged_results.append(result)
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def order_results(self):
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for result in self._merged_results:
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score = result_score(result)
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result['score'] = score
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with RLock():
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for result_engine in result['engines']:
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engines[result_engine].stats['score_count'] += score
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results = sorted(self._merged_results, key=itemgetter('score'), reverse=True)
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# pass 2 : group results by category and template
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gresults = []
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categoryPositions = {}
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for i, res in enumerate(results):
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# FIXME : handle more than one category per engine
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category = engines[res['engine']].categories[0] + ':' + ''\
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if 'template' not in res\
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else res['template']
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current = None if category not in categoryPositions\
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else categoryPositions[category]
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# group with previous results using the same category
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# if the group can accept more result and is not too far
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# from the current position
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if current is not None and (current['count'] > 0)\
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and (len(gresults) - current['index'] < 20):
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# group with the previous results using
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# the same category with this one
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index = current['index']
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gresults.insert(index, res)
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# update every index after the current one
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# (including the current one)
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for k in categoryPositions:
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v = categoryPositions[k]['index']
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if v >= index:
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categoryPositions[k]['index'] = v + 1
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# update this category
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current['count'] -= 1
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else:
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# same category
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gresults.append(res)
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# update categoryIndex
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categoryPositions[category] = {'index': len(gresults), 'count': 8}
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# update _merged_results
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self._ordered = True
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self._merged_results = gresults
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def get_ordered_results(self):
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if not self._ordered:
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self.order_results()
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return self._merged_results
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def results_length(self):
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return len(self._merged_results)
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def results_number(self):
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resultnum_sum = sum(self._number_of_results)
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if not resultnum_sum or not self._number_of_results:
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return 0
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return resultnum_sum / len(self._number_of_results)
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