mirror of
https://github.com/reddit-archive/reddit1.0.git
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60 lines
2.3 KiB
Common Lisp
60 lines
2.3 KiB
Common Lisp
;;;; Copyright 2018 Reddit, Inc.
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;;;;
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;;;; Permission is hereby granted, free of charge, to any person obtaining a copy of
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;;;; this software and associated documentation files (the "Software"), to deal in
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;;;; the Software without restriction, including without limitation the rights to
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;;;; use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
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;;;; of the Software, and to permit persons to whom the Software is furnished to do
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;;;; so, subject to the following conditions:
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;;;;
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;;;; The above copyright notice and this permission notice shall be included in all
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;;;; copies or substantial portions of the Software.
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;;;;
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;;;; THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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;;;; IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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;;;; FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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;;;; AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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;;;; LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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;;;; OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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;;;; SOFTWARE.
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(in-package :reddit)
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(defun search-char (c)
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"T if c is an a letter, number, or '"
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(or (alphanumericp c)
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(member c '(#\' #\space #\"))))
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(defmacro rra (rex new str)
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"Make regex-replace-all lest awkward to type"
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`(regex-replace-all ,rex ,str ,new))
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(defun to-search-str (str)
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"Formats the incoming str into a valid tsearch string"
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(rra "(?i) or | " "|"
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(rra "\\s+$" ""
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(rra "^\\s+" ""
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(rra "(?i) and " "&"
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(rra "\\s+" " "
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(rra "\\\"" "'"
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(remove-if-not #'search-char str))))))))
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(defun search-sites (str &optional (limit 25) (offset 0))
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(when (> (length str) 0)
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(let ((q (format nil "to_tsquery('default', ~a)" (sql (to-search-str str)))))
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(select 'article-with-sn
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:where (sql-expression :string (format nil "idxfti @@ ~a" q))
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:order-by `((,(sql-expression :string (format nil "rank(idxfti, ~a)" q)) desc)
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(,[articles_sn date] desc))
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:offset offset
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:limit limit
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:flatp t))))
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