Stephen Adams
d8b7ec5163
On a per output-unit basis, repeated large strings are shared via a `string$` pool. TODOs: - don't do it with strings passed to JS() code (they might need to be property accesses). - tweak thresholds, using different thresholds for slow/run-once code. Change-Id: Ib14245d9d428e52fb2ca23f34fa533de97fa2208 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/136304 Reviewed-by: Joshua Litt <joshualitt@google.com> Commit-Queue: Stephen Adams <sra@google.com>
112 lines
2.4 KiB
Dart
112 lines
2.4 KiB
Dart
// Copyright (c) 2020, 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:expect/expect.dart';
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import 'package:compiler/src/js_backend/string_abbreviation.dart';
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void test(List<String> inputs, List<String> expected, {int minLength = 6}) {
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Expect.listEquals(
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expected, abbreviateToIdentifiers(inputs, minLength: minLength));
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}
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void main() {
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// No strings yields an empty pool.
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test([], []);
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// Results identical stretches compressed-out.
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test(
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[
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'Greetings Bob Smith',
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'Great work!',
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'Greetings Alice',
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'Greetings Bob Henry',
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],
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[
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'GreetiBS',
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'Great_',
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'GreetiA',
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'GreetiBH',
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],
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);
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test(
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[
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'Greetings Bob Smith',
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'Great work!',
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'Greetings Alice',
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'Greetings Bob Henry',
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],
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[
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'GeBS',
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'Ga',
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'GeA',
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'GeBH',
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],
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minLength: 1,
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);
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// Non-identifiers are replaced with '_' if that is unambiguous.
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test(
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['!pingpong', 'xylograph'],
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['_pingp', 'xylogr'],
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);
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test(['\u1234\xff'], ['__']);
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test(['\u1234\xff', 'smile'], ['__', 'smile']);
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test(
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['a*b+c', '(x,y)', 'a*c-e', '(x,z)'],
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['a_b_c', '_x_y_', 'a_c_e', '_x_z_'],
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);
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// Multiple discriminating non-identifier characters are replaced with an
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// escape, which causes a potentially ambiguous non-escape to be escaped.
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test(
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['a xylograph', 'a !pingpong', 'a %percent'],
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['a_x78ylo', 'a_x21pin', 'a_x25per'],
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);
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test(
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['a\u1234z', 'auz'],
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['a_z', 'auz'],
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);
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test(
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['a\u1234z', 'auz'],
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['a_', 'au'],
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minLength: 1,
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);
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test(
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['a\u1234z', 'auz', 'a&z'],
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['au1234z', 'ax75z', 'ax26z'],
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);
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test(
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['a\u1234z', 'auz', 'a&z'],
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['au1234', 'ax75', 'ax26'],
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minLength: 1,
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);
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test(
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['a\u1234z', 'auz', 'a&z', 'a\u2345z'],
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['au1234z', 'ax75z', 'ax26z', 'au2345z'],
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);
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test(
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['a\u1234z', 'auz', 'a&z', 'a\u2345z'],
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['au1234', 'ax75', 'ax26', 'au2345'],
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minLength: 1,
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);
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test(
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['a\u1234z', 'auz', 'a&z', 'a\u2345z', 'axe'],
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['au1234z', 'ax75z', 'ax26z', 'au2345z', 'ax78e'],
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);
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test(
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['a\u1234z', 'auz', 'a&z', 'a\u2345z', 'axe'],
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['au1234', 'ax75', 'ax26', 'au2345', 'ax78'],
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minLength: 1,
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);
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}
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