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// Copyright (c) 2015, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
// @dart = 2.7
import "package:compiler/src/js_backend/js_backend.dart" show TokenScope;
import "package:expect/expect.dart";
import 'package:front_end/src/api_unstable/dart2js.dart' show $A;
String forwardN(TokenScope scope, int N) {
for (int i = 1; i < N; ++i) {
scope.getNextName();
}
return scope.getNextName();
}
void main() {
// Test a normal scope.
TokenScope scope = new TokenScope();
// We start with 'a'.
Expect.equals("a", scope.getNextName());
// We have 24 lower case characters, as s and g are illegal.
Expect.equals("A", forwardN(scope, 24));
// Make it overflow by skipping all uppercase.
Expect.equals("a_", forwardN(scope, 26));
// Now numbers.
Expect.equals("a0", forwardN(scope, 1));
Expect.equals("a9", forwardN(scope, 9));
// Then lower case letters.
Expect.equals("aa", forwardN(scope, 1));
Expect.equals("az", forwardN(scope, 25));
// Then upper case letters
Expect.equals("aA", forwardN(scope, 1));
Expect.equals("aZ", forwardN(scope, 25));
// Overflow to first position.
Expect.equals("b_", forwardN(scope, 1));
// Make sure we skipe g. We have 1 + 10 + 26 + 26 = 63 digits.
Expect.equals("h_", forwardN(scope, 63 * 5));
// Likewise, ensure we skip s.
Expect.equals("t_", forwardN(scope, 63 * 11));
// And wrap around another digit.
Expect.equals("a__", forwardN(scope, 63 * 33));
// Test a filtered scope.
Set<String> illegal = new Set.from(["b", "aa"]);
scope = new TokenScope(illegalNames: illegal);
// We start with 'a'.
Expect.equals("a", forwardN(scope, 1));
// Make sure 'b' is skipped.
Expect.equals("c", forwardN(scope, 1));
// We have 24 lower case characters, as s and g are illegal.
Expect.equals("A", forwardN(scope, 22));
// Make it overflow by skipping all uppercase.
Expect.equals("a_", forwardN(scope, 26));
// Now numbers.
Expect.equals("a0", forwardN(scope, 1));
Expect.equals("a9", forwardN(scope, 9));
// Make sure 'aa' is skipped on wrapping
Expect.equals("ab", forwardN(scope, 1));
Expect.equals("az", forwardN(scope, 24));
// Test a initial char
{
TokenScope scope = new TokenScope(initialChar: $A);
// We start with 'A'.
Expect.equals("A", scope.getNextName());
// Overflow should still start with 'A'.
Expect.equals("A_", forwardN(scope, 26));
}
{
TokenScope scope = new TokenScope(initialChar: $A + 1);
// We start with 'A'.
Expect.equals("B", scope.getNextName());
}
}