mirror of
https://github.com/mozilla/gecko-dev.git
synced 2024-11-13 23:17:57 +00:00
76 lines
2.2 KiB
JavaScript
76 lines
2.2 KiB
JavaScript
/* This Source Code Form is subject to the terms of the Mozilla Public
|
|
* License, v. 2.0. If a copy of the MPL was not distributed with this
|
|
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
|
|
|
|
// This file tests the Levenshtein Distance function we've registered.
|
|
|
|
function createUtf16Database()
|
|
{
|
|
print("Creating the in-memory UTF-16-encoded database.");
|
|
let conn = getService().openSpecialDatabase("memory");
|
|
conn.executeSimpleSQL("PRAGMA encoding = 'UTF-16'");
|
|
|
|
print("Make sure the encoding was set correctly and is now UTF-16.");
|
|
let stmt = conn.createStatement("PRAGMA encoding");
|
|
do_check_true(stmt.executeStep());
|
|
let enc = stmt.getString(0);
|
|
stmt.finalize();
|
|
|
|
// The value returned will actually be UTF-16le or UTF-16be.
|
|
do_check_true(enc === "UTF-16le" || enc === "UTF-16be");
|
|
|
|
return conn;
|
|
}
|
|
|
|
function check_levenshtein(db, s, t, expectedDistance)
|
|
{
|
|
var stmt = db.createStatement("SELECT levenshteinDistance(:s, :t) AS result");
|
|
stmt.params.s = s;
|
|
stmt.params.t = t;
|
|
try {
|
|
do_check_true(stmt.executeStep());
|
|
do_check_eq(expectedDistance, stmt.row.result);
|
|
}
|
|
finally {
|
|
stmt.reset();
|
|
stmt.finalize();
|
|
}
|
|
}
|
|
|
|
function testLevenshtein(db)
|
|
{
|
|
// Basic tests.
|
|
check_levenshtein(db, "", "", 0);
|
|
check_levenshtein(db, "foo", "", 3);
|
|
check_levenshtein(db, "", "bar", 3);
|
|
check_levenshtein(db, "yellow", "hello", 2);
|
|
check_levenshtein(db, "gumbo", "gambol", 2);
|
|
check_levenshtein(db, "kitten", "sitten", 1);
|
|
check_levenshtein(db, "sitten", "sittin", 1);
|
|
check_levenshtein(db, "sittin", "sitting", 1);
|
|
check_levenshtein(db, "kitten", "sitting", 3);
|
|
check_levenshtein(db, "Saturday", "Sunday", 3);
|
|
check_levenshtein(db, "YHCQPGK", "LAHYQQKPGKA", 6);
|
|
|
|
// Test SQL NULL handling.
|
|
check_levenshtein(db, "foo", null, null);
|
|
check_levenshtein(db, null, "bar", null);
|
|
check_levenshtein(db, null, null, null);
|
|
|
|
// The levenshteinDistance function allocates temporary memory on the stack
|
|
// if it can. Test some strings long enough to force a heap allocation.
|
|
var dots1000 = Array(1001).join(".");
|
|
var dashes1000 = Array(1001).join("-");
|
|
check_levenshtein(db, dots1000, dashes1000, 1000);
|
|
}
|
|
|
|
function run_test()
|
|
{
|
|
testLevenshtein(getOpenedDatabase());
|
|
testLevenshtein(createUtf16Database());
|
|
}
|
|
|
|
|
|
|
|
|