Skip to content

Instantly share code, notes, and snippets.

@munificent

munificent/parameter_kinds.dart

Created February 17, 2022 22:55
Show Gist options

  • Select an option

    Learn more about clone URLs
  • Save munificent/58e90ede090d75a46ee522b571a36f37 to your computer and use it in GitHub Desktop.

Select an option

Learn more about clone URLs
Save munificent/58e90ede090d75a46ee522b571a36f37 to your computer and use it in GitHub Desktop.
Download ZIP

Revisions

  1. munificent created this gist Feb 17, 2022.
    50 changes: 50 additions & 0 deletions parameter_kinds.dart
    View file
    Original file line number Diff line number Diff line change
    @@ -0,0 +1,50 @@
    // Copyright (c) 2020, 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.
    import 'package:analyzer/dart/ast/ast.dart';
    import 'package:scrape/scrape.dart';

    void main(List<String> arguments) {
    Scrape()
    ..addHistogram('Signatures')
    ..addHistogram('Parameters')
    ..addVisitor(() => ParameterVisitor())
    ..runCommandLine(arguments);
    }

    class ParameterVisitor extends ScrapeVisitor {
    @override
    void visitFunctionDeclaration(FunctionDeclaration node) {
    recordParameters(node.functionExpression.parameters);
    super.visitFunctionDeclaration(node);
    }

    @override
    void visitMethodDeclaration(MethodDeclaration node) {
    recordParameters(node.parameters);
    super.visitMethodDeclaration(node);
    }

    void recordParameters(FormalParameterList? parameters) {
    if (parameters == null) return;

    var signature = <String>[];
    for (var parameter in parameters.parameters) {
    if (parameter.isRequiredPositional) {
    record('Parameters', 'required positional');
    signature.add('P');
    } else if (parameter.isOptionalPositional) {
    record('Parameters', 'optional positional');
    signature.add('O');
    } else if (parameter.isRequiredNamed) {
    record('Parameters', 'required named');
    signature.add('R');
    } else if (parameter.isOptionalNamed) {
    record('Parameters', 'optional named');
    signature.add('N');
    }
    }

    record('Signatures', '(${signature.join(',')})');
    }
    }