private static()

in src/PublicToInternalGenerator/PublicToInternalGenerator.cs [36:71]

• 24 lines of code
• 4 McCabe index (conditional complexity)

  private static (string fileName, string sourceText)? ProcessFile(
    AdditionalText file, CancellationToken cancellationToken)
  {
    var sourceText = file.GetText(cancellationToken);
    if (sourceText == null) return null;

    var syntaxTree = CSharpSyntaxTree.ParseText(sourceText, cancellationToken: cancellationToken);
    var root = syntaxTree.GetCompilationUnitRoot(cancellationToken);

    var rewriter = new PublicToInternalRewriter();

    var newRoot = rewriter.Visit(root);
    if (newRoot == root) return null; // only generate if changes were made

    var sourceCode = newRoot.GetText(Encoding.UTF8).ToString();

    sourceCode = "// <auto-generated />\r\n" + sourceCode;

    const string nullableDisableDirective = "#nullable disable";

    if (!sourceCode.Contains(nullableDisableDirective))
      throw new Exception("Nullability directive expected!");

    sourceCode = sourceCode.Replace(
      nullableDisableDirective,
      $"#if NETCOREAPP3_0_OR_GREATER || NETSTANDARD2_1_OR_GREATER\r\n{nullableDisableDirective}\r\n#endif");

    // when declared as 'partial' it should not clash with the user's Embedded attribute declaration
    sourceCode += "\r\nnamespace Microsoft.CodeAnalysis\r\n{\r\n  " +
                  "internal sealed partial class EmbeddedAttribute : global::System.Attribute { }\r\n}";

    var fileName = Path.GetFileNameWithoutExtension(file.Path);
    var newFileName = $"{fileName}.Internal.cs";

    return (newFileName, sourceCode);
  }