зеркало из https://github.com/mozilla/gecko-dev.git
67 строки
2.2 KiB
JavaScript
67 строки
2.2 KiB
JavaScript
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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// This file tests the Levenshtein Distance function we've registered.
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function createUtf16Database() {
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print("Creating the in-memory UTF-16-encoded database.");
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let conn = Services.storage.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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Assert.ok(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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Assert.ok(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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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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Assert.ok(stmt.executeStep());
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Assert.equal(expectedDistance, stmt.row.result);
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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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// 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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testLevenshtein(getOpenedDatabase());
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testLevenshtein(createUtf16Database());
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}
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