Robert Nystrom
891a8a1aa3
The README explains, it but, in short, this is a little library I harvested from the scripts I wrote during ui-as-code. It makes it easier to write scripts to gather bits of statistical data from Dart syntax. Change-Id: Ia33797f582c4d4f9f966b7f6dc7b58ca2414601e Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/166788 Commit-Queue: Bob Nystrom <rnystrom@google.com> Reviewed-by: Phil Quitslund <pquitslund@google.com> Auto-Submit: Bob Nystrom <rnystrom@google.com>
57 lines
1.7 KiB
Dart
57 lines
1.7 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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import 'package:analyzer/dart/ast/ast.dart';
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import 'package:scrape/scrape.dart';
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/// Looks at expressions that could likely be converted to spread operators and
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/// measures their length. "Likely" means calls to `addAll()` where the
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/// receiver is a list or map literal.
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void main(List<String> arguments) {
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Scrape()
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..addHistogram('Arguments')
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..addHistogram('Lengths', order: SortOrder.numeric)
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..addVisitor(() => SpreadVisitor())
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..runCommandLine(arguments);
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}
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class SpreadVisitor extends ScrapeVisitor {
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@override
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void visitCascadeExpression(CascadeExpression node) {
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for (var section in node.cascadeSections) {
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if (section is MethodInvocation) {
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_countCall(node, section.methodName, node.target, section.argumentList);
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}
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}
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super.visitCascadeExpression(node);
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}
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@override
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void visitMethodInvocation(MethodInvocation node) {
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_countCall(node, node.methodName, node.target, node.argumentList);
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super.visitMethodInvocation(node);
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}
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void _countCall(Expression node, SimpleIdentifier name, Expression target,
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ArgumentList args) {
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if (name.name != 'addAll') return;
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// See if the target is a collection literal.
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while (target is MethodInvocation) {
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target = (target as MethodInvocation).target;
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}
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if (target is ListLiteral || target is SetOrMapLiteral) {
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if (args.arguments.length == 1) {
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var arg = args.arguments[0];
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record('Arguments', arg.toString());
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record('Lengths', arg.length);
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}
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printNode(node);
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}
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}
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}
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