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11a101a325
Evaluate and canonicalize the parameters to the built-in function identical(a,b) if they are strings. This guarantees that identical(“ab”, “a”+”b”) evaluates to true. Note: when the parser parses “a”+”b”, it doesn’t know whether the expression will be used in a context that may require a constant value. The canonicalization is thus deferred until it is known that it is required. BUG=25024 R=rmacnak@google.com Review URL: https://codereview.chromium.org/1558033002 .
52 lines
1.8 KiB
Dart
52 lines
1.8 KiB
Dart
// Copyright (c) 2011, 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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import "package:expect/expect.dart";
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// Exercises compile-time string constants
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const yz = "y" + "z";
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main() {
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// Constant comparisons are independent of the quotes used.
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Expect.isTrue(identical("abcd", 'abcd'));
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Expect.isTrue(identical('abcd', "abcd"));
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Expect.isTrue(identical("ab\"cd", 'ab"cd'));
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Expect.isTrue(identical('ab\'cd', "ab'cd"));
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// String concatenation works even when quotes are different.
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Expect.isTrue(identical("abcd", "ab" "cd"));
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Expect.isTrue(identical("abcd", "ab" 'cd'));
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Expect.isTrue(identical("abcd", 'ab' 'cd'));
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Expect.isTrue(identical("abcd", 'ab' "cd"));
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// Or when there are more than 2 contatenations.
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Expect.isTrue(identical("abcd", "a" "b" "cd"));
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Expect.isTrue(identical("abcd", "a" "b" "c" "d"));
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Expect.isTrue(identical('abcd', 'a' 'b' 'c' 'd'));
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Expect.isTrue(identical("abcd", "a" "b" 'c' "d"));
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Expect.isTrue(identical("abcd", 'a' 'b' 'c' 'd'));
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Expect.isTrue(identical("abcd", 'a' "b" 'c' "d"));
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Expect.isTrue(identical("a'b'cd", "a" "'b'" 'c' "d"));
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Expect.isTrue(identical("a\"b\"cd", "a" '"b"' 'c' "d"));
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Expect.isTrue(identical("a\"b\"cd", "a" '"b"' 'c' "d"));
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Expect.isTrue(identical("a'b'cd", 'a' "'b'" 'c' "d"));
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Expect.isTrue(identical('a\'b\'cd', "a" "'b'" 'c' "d"));
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Expect.isTrue(identical('a"b"cd', 'a' '"b"' 'c' "d"));
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Expect.isTrue(identical("a\"b\"cd", 'a' '"b"' 'c' "d"));
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const a = identical("ab", "a" + "b");
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Expect.isTrue(a);
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const b = identical("xyz", "x" + yz);
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Expect.isTrue(b);
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const c = identical("12", "1" "2");
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Expect.isTrue(c);
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const d = identical("zyz", "z$yz");
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Expect.isTrue(d);
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}
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