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109 lines
3.8 KiB
JavaScript
109 lines
3.8 KiB
JavaScript
/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is Storage Test Code.
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*
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* The Initial Developer of the Original Code is
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* Mozilla Corporation.
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* Portions created by the Initial Developer are Copyright (C) 2009
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Curtis Bartley <cbartley@mozilla.com> (Original Author)
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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// This file tests the Levenshtein Distance function we've registered.
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function createUtf16Database()
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{
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print("Creating the in-memory UTF-16-encoded database.");
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let conn = getService().openSpecialDatabase("memory");
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conn.executeSimpleSQL("PRAGMA encoding = 'UTF-16'");
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print("Make sure the encoding was set correctly and is now UTF-16.");
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let stmt = conn.createStatement("PRAGMA encoding");
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do_check_true(stmt.executeStep());
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let enc = stmt.getString(0);
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stmt.finalize();
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// The value returned will actually be UTF-16le or UTF-16be.
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do_check_true(enc === "UTF-16le" || enc === "UTF-16be");
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return conn;
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}
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function check_levenshtein(db, s, t, expectedDistance)
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{
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var stmt = db.createStatement("SELECT levenshteinDistance(:s, :t) AS result");
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stmt.params.s = s;
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stmt.params.t = t;
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try {
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do_check_true(stmt.executeStep());
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do_check_eq(expectedDistance, stmt.row.result);
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}
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finally {
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stmt.reset();
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stmt.finalize();
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}
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}
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function testLevenshtein(db)
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{
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// Basic tests.
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check_levenshtein(db, "", "", 0);
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check_levenshtein(db, "foo", "", 3);
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check_levenshtein(db, "", "bar", 3);
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check_levenshtein(db, "yellow", "hello", 2);
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check_levenshtein(db, "gumbo", "gambol", 2);
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check_levenshtein(db, "kitten", "sitten", 1);
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check_levenshtein(db, "sitten", "sittin", 1);
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check_levenshtein(db, "sittin", "sitting", 1);
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check_levenshtein(db, "kitten", "sitting", 3);
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check_levenshtein(db, "Saturday", "Sunday", 3);
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check_levenshtein(db, "YHCQPGK", "LAHYQQKPGKA", 6);
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// Test SQL NULL handling.
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check_levenshtein(db, "foo", null, null);
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check_levenshtein(db, null, "bar", null);
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check_levenshtein(db, null, null, null);
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// The levenshteinDistance function allocates temporary memory on the stack
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// if it can. Test some strings long enough to force a heap allocation.
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var dots1000 = Array(1001).join(".");
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var dashes1000 = Array(1001).join("-");
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check_levenshtein(db, dots1000, dashes1000, 1000);
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}
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function run_test()
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{
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testLevenshtein(getOpenedDatabase());
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testLevenshtein(createUtf16Database());
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}
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