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Search on steroids! Searching now takes complicated queries.

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This commit is contained in:
Raoul Snyman 2010-02-22 22:46:35 +02:00
parent 31fc3695c3
commit d2bfec7c2e
4 changed files with 81 additions and 60 deletions
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30
scribeengine/controllers/blog.py
View File

@ -22,6 +22,7 @@
import logging
from datetime import datetime
from pprint import pformat
from sqlalchemy.sql import or_
@ -118,11 +119,30 @@ class BlogController(BaseController):
if not c.querystring:
h.flash.set_message(u'You didn\'t supply anything to search for.', u'error')
h.redirect_to('/')
keywords = [or_(Post.body.contains(kw.strip()), Post.title.contains(kw.strip())) for kw in c.querystring.split(',')]
c.page_title = u'Search'
kwprocessor = utils.KeywordProcessor(
groups=[None, '+', '-'],
group=tuple,
normalize=lambda s: s.strip(' \"\'')
)
keywords, ands, nots = kwprocessor.split(c.querystring)
or_clauses = []
for kw in keywords:
or_clauses.append(Post.body.contains(kw.strip()))
or_clauses.append(Post.title.contains(kw.strip()))
and_clauses = [or_(Post.body.contains(aw.strip()),
Post.title.contains(aw.strip())) for aw in ands]
not_clauses = [or_(Post.body.contains(nw.strip()),
Post.title.contains(nw.strip())) for nw in nots]
c.posts = Session.query(Post)
for or_clause in keywords:
c.posts = c.posts.filter(or_clause)
c.posts = c.posts.all()
if len(or_clauses) > 0:
c.posts = c.posts.filter(or_(*or_clauses))
if len(and_clauses) > 0:
for and_clause in and_clauses:
c.posts = c.posts.filter(and_clause)
if len(not_clauses) > 0:
for not_clause in not_clauses:
c.posts = c.posts.filter(~not_clause)
c.posts = c.posts.order_by(Post.created.desc()).all()
c.page_title = u'Search'
return render(u'/blog/search.mako')

100
scribeengine/lib/utils.py
View File

@ -33,72 +33,66 @@ from turbomail import Message
from scribeengine.lib.base import render, h
class KeywordProcessor(object):
"""Process user-supplied keywords, tags, or search terms.
This tries to be as flexible as possible while being efficient.
The vast majority of the work is done in the regular expression."""
def __init__(self, separators=' \t', quotes=['"', "'"], groups=[], group=False, normalize=None, sort=False, result=list):
"""Configure the processor.
separators: A list of acceptable separator characters. The first will be used for joins.
quotes: Pass a list or tuple of allowable quotes. E.g. ["\"", "'"] or None to disable.
groups: Pass a string, list, or tuple of allowable prefixes. E.g. '+-' or None to disable.
group: Pass in the type you want to group by, e.g. list, tuple, or dict.
normalize: Pass a function which will normalize the results. E.g. lambda s: s.lower().strip(' \"')
sort: Sort the resulting list (or lists) alphabeticlly.
result: The return type. One of set, tuple, list.
If groups are defined, and group is not, the result will be a list/tuple/set of tuples, e.g. [('+', "foo"), ...]
"""
separators = list(separators)
self.pattern = ''.join((
('[\s%s]*' % (''.join(separators), )), # Trap possible leading space or separators.
'(',
('[%s]%s' % (''.join([i for i in list(groups) if i is not None]), '?' if None in groups else '')) if groups else '', # Pass groups=('+','-') to handle optional leading + or -.
''.join([(r'%s[^%s]+%s|' % (i, i, i)) for i in quotes]) if quotes else '', # Match any amount of text (that isn't a quote) inside quotes.
('[^%s]+' % (''.join(separators), )), # Match any amount of text that isn't whitespace.
')',
('[%s]*' % (''.join(separators), )), # Match possible separator character.
))
self.regex = re.compile(self.pattern)
self.groups = list(groups)
self.group = dict if group is True else group
self.normalize = normalize
self.sort = sort
self.result = result
"""Process user-supplied keywords, tags, or search terms.
This tries to be as flexible as possible while being efficient.
The vast majority of the work is done in the regular expression."""
def __init__(self, separators=' \t', quotes=['"', "'"], groups=[], group=False, normalize=None, sort=False, result=list):
"""Configure the processor.
separators: A list of acceptable separator characters. The first will be used for joins.
quotes: Pass a list or tuple of allowable quotes. E.g. ["\"", "'"] or None to disable.
groups: Pass a string, list, or tuple of allowable prefixes. E.g. '+-' or None to disable.
group: Pass in the type you want to group by, e.g. list, tuple, or dict.
normalize: Pass a function which will normalize the results. E.g. lambda s: s.lower().strip(' \"')
sort: Sort the resulting list (or lists) alphabeticlly.
result: The return type. One of set, tuple, list.
If groups are defined, and group is not, the result will be a list/tuple/set of tuples, e.g. [('+', "foo"), ...]
"""
separators = list(separators)
self.pattern = ''.join((
('[\s%s]*' % (''.join(separators), )), # Trap possible leading space or separators.
'(',
('[%s]%s' % (''.join([i for i in list(groups) if i is not None]), '?' if None in groups else '')) if groups else '', # Pass groups=('+','-') to handle optional leading + or -.
''.join([(r'%s[^%s]+%s|' % (i, i, i)) for i in quotes]) if quotes else '', # Match any amount of text (that isn't a quote) inside quotes.
('[^%s]+' % (''.join(separators), )), # Match any amount of text that isn't whitespace.
')',
('[%s]*' % (''.join(separators), )), # Match possible separator character.
))
self.regex = re.compile(self.pattern)
self.groups = list(groups)
self.group = dict if group is True else group
self.normalize = normalize
self.sort = sort
self.result = result
def split(self, value):
if not isinstance(value, basestring): raise TypeError("Invalid type for argument 'value'.")
if not isinstance(value, basestring):
raise TypeError("Invalid type for argument 'value'.")
matches = self.regex.findall(value)
if callable(self.normalize): matches = [self.normalize(i) for i in matches]
if self.sort: matches.sort()
if not self.groups: return self.result(matches)
if callable(self.normalize):
matches = [self.normalize(i) for i in matches]
if self.sort:
matches.sort()
if not self.groups:
return self.result(matches)
groups = dict([(i, list()) for i in self.groups])
if None not in groups.iterkeys(): groups[None] = list() # To prevent errors.
if None not in groups.iterkeys():
groups[None] = list() # To prevent errors.
for i in matches:
if i[0] in self.groups:
groups[i[0]].append(i[1:])
else:
groups[None].append(i)
if self.group is dict: return groups
if self.group is dict:
return groups
if self.group is False or self.group is None:
results = []
for group in self.groups:
results.extend([(group, match) for match in groups[group]])
return self.result(results)
return self.group([[match for match in groups[group]] for group in self.groups])

9
scribeengine/templates/blog/search.mako
View File

@ -23,4 +23,11 @@
% endfor
% else:
<div class="post"><p>Sorry, there seem to be no results for your search query.</p></div>
% endif
<h3>Search tips:</h3>
<ul>
<li>Words should be space-separated.</li>
<li>Use quotes (&quot;) to group phrases.</li>
<li>Use plus (+) to make words/phrases mandatory.</li>
<li>Use minus (-) to exclude posts with those words/phrases.</li>
</ul>
% endif

2
scribeengine/templates/sidebar.mako
View File

@ -3,7 +3,7 @@
<li id="search">
<form id="searchform" method="get" action="/search">
<div>
<input type="text" name="q" id="s" size="15" />
<input type="text" name="q" id="s" size="15" value="${c.querystring}" />
<br />
<input type="submit" value="Search" />
</div>