Function csharpNamespaceScope

src/resolution/name-matcher.ts:4216–4236

* The namespaces a C# file's code runs in and the ones it imports: its * `namespace` declarations, its `using X;`, the `global using X;` of its * project's files (every file's, outside any project) and the * ` ` of the project files above it.

(file: string, context: ResolutionContext)

 * `<Using Include="X" />` of the project files above it.
 */
function csharpNamespaceScope(file: string, context: ResolutionContext): { namespaces: string[]; usings: Set<string>; aliases: Map<string, string> } {
  let memo = CSHARP_NAMESPACE_SCOPES.get(context);
  if (!memo) CSHARP_NAMESPACE_SCOPES.set(context, (memo = new Map()));
  const hit = memo.get(file);
  if (hit) return hit;
  const text = stripCommentsForRegex(context.readFile(file) ?? '', 'java');
  const namespaces = [...text.matchAll(/^\s*namespace\s+([\w.]+)/gm)].map((m) => m[1]!);
  let projectMemo = CSHARP_PROJECT_USINGS.get(context);
  if (!projectMemo) CSHARP_PROJECT_USINGS.set(context, (projectMemo = new Map()));
  const project = csharpProjectUsings(path.posix.dirname(file), context, projectMemo);
  const usings = new Set<string>(project.usings);
  if (!project.project) for (const u of csharpGlobalUsings('.', context)) usings.add(u);
  const aliases = new Map<string, string>();
  for (const m of text.matchAll(/^\s*(?:global\s+)?using\s+(?!static\b)(?:([A-Za-z_]\w*)\s*=\s*)?([\w.]+)\s*;/gm)) {
    if (m[1]) aliases.set(m[1], m[2]!);
    else usings.add(m[2]!);
  }
  const scope = { namespaces, usings, aliases };
  memo.set(file, scope);
  return scope;
}

/**
 * The `<Using Include="X" />` of the project files from `dir` up, and the