url_parse.sqlx

config { hasOutput: true }
/*
 * Copyright 2019 Google LLC
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

--url_parse(string urlString, string partToExtract)
--Returns the specified part from the URL. Valid values for partToExtract include PROTOCOL, HOST, PATH, QUERY, and REF.
--For example, parse_url('http://facebook.com/path1/p.php?k1=v1&k2=v2#Ref1', 'HOST') returns 'facebook.com'.
CREATE OR REPLACE FUNCTION ${self()}(url STRING, part STRING)
OPTIONS (
    description="""Returns the specified part from the URL. Valid values for partToExtract include PROTOCOL, HOST, PATH, QUERY, and REF.
Returns the specified part from the URL. Valid values for partToExtract include PROTOCOL, HOST, PATH, QUERY, and REF.
For example, parse_url('http://facebook.com/path1/p.php?k1=v1&k2=v2#Ref1', 'HOST') returns 'facebook.com'."""
)
AS (
  CASE
    WHEN UPPER(part) = 'HOST'  THEN REGEXP_EXTRACT(url, r'(?:[a-zA-Z]+://)?([a-zA-Z0-9-.]+)/?')
    WHEN UPPER(part) = 'PATH'  THEN REGEXP_EXTRACT(url, r'(?:[a-zA-Z]+://)?(?:[a-zA-Z0-9-.]+)/{1}([a-zA-Z0-9-.~_/]+)')
    WHEN UPPER(part) = 'QUERY' THEN REGEXP_EXTRACT(url, r'\?(.*)')
    WHEN UPPER(part) = 'REF'   THEN REGEXP_EXTRACT(url, r'#(.*)')
    WHEN UPPER(part) = 'PROTOCOL' THEN REGEXP_EXTRACT(url, r'^([a-zA-Z]+)://')
    ELSE NULL
  END
);