Joshua Litt
20faaa5d94
Change-Id: Ib18f554c1076f27a3f7c0df5a36410da41a1f467 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/148784 Reviewed-by: Paul Berry <paulberry@google.com> Reviewed-by: Sigmund Cherem <sigmund@google.com>
66 lines
2.2 KiB
Dart
66 lines
2.2 KiB
Dart
// Copyright (c) 2015, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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// @dart = 2.7
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import "package:compiler/src/js_backend/js_backend.dart" show TokenScope;
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import "package:expect/expect.dart";
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String forwardN(TokenScope scope, int N) {
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for (int i = 1; i < N; ++i) {
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scope.getNextName();
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}
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return scope.getNextName();
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}
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void main() {
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// Test a normal scope.
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TokenScope scope = new TokenScope();
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// We start with 'a'.
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Expect.equals("a", scope.getNextName());
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// We have 24 lower case characters, as s and g are illegal.
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Expect.equals("A", forwardN(scope, 24));
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// Make it overflow by skipping all uppercase.
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Expect.equals("a_", forwardN(scope, 26));
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// Now numbers.
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Expect.equals("a0", forwardN(scope, 1));
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Expect.equals("a9", forwardN(scope, 9));
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// Then lower case letters.
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Expect.equals("aa", forwardN(scope, 1));
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Expect.equals("az", forwardN(scope, 25));
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// Then upper case letters
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Expect.equals("aA", forwardN(scope, 1));
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Expect.equals("aZ", forwardN(scope, 25));
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// Overflow to first position.
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Expect.equals("b_", forwardN(scope, 1));
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// Make sure we skipe g. We have 1 + 10 + 26 + 26 = 63 digits.
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Expect.equals("h_", forwardN(scope, 63 * 5));
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// Likewise, ensure we skip s.
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Expect.equals("t_", forwardN(scope, 63 * 11));
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// And wrap around another digit.
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Expect.equals("a__", forwardN(scope, 63 * 33));
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// Test a filtered scope.
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Set<String> illegal = new Set.from(["b", "aa"]);
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scope = new TokenScope(illegal);
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// We start with 'a'.
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Expect.equals("a", forwardN(scope, 1));
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// Make sure 'b' is skipped.
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Expect.equals("c", forwardN(scope, 1));
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// We have 24 lower case characters, as s and g are illegal.
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Expect.equals("A", forwardN(scope, 22));
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// Make it overflow by skipping all uppercase.
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Expect.equals("a_", forwardN(scope, 26));
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// Now numbers.
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Expect.equals("a0", forwardN(scope, 1));
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Expect.equals("a9", forwardN(scope, 9));
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// Make sure 'aa' is skipped on wrapping
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Expect.equals("ab", forwardN(scope, 1));
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Expect.equals("az", forwardN(scope, 24));
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}
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