fix(swift): what a SwiftUI app's viewer showed that was not so (#2109)

Three things IceCubesApp showed in `codegraph ui`:

Steps labelled calls that leave the index by other stacks' names:
`rawValue.data(using: .utf8)` network (25 boxes), Foundation's `Timer`
telemetry, `Calendar` and a SiriKit `intent` device, the app's own
`Notifications` endpoint enum device (expo-notifications' row), and
`viewModel.votes.firstIndex(of:)` a database read (the `\w*Model` row).
Now: a Swift `.data/.upload/.download/.bytes` is network only on a
`*session` receiver; Timer/Calendar/intent are no effect in Swift; a
`viewModel` is not a table (any language); a keychain receiver is
storage ahead of Swift's generic `x.delete` database row. A call whose
receiver is a type the Swift project declares — not an `extension X {}`,
which declares nothing (read through the site reader) — no longer
matches the library-name rows; the model and reply rows, written for
project types, still do.

"Files that run something" listed every view with a `#Preview { … }`:
the macro sits at a file's top level, so its constructions were
module-level edges. Entry points now subtract calls inside a Swift
file's top-level previews (trailing closures included — WidgetKit's
`} timeline: {`), drop a file left with none, and re-rank.

Every `struct X: View` had a one-line `component` twin, and `@main`
apps, view controllers and UIView subclasses a `class` twin, from the
SwiftUI/UIKit resolvers' regex extract(): 188 nodes on IceCubesApp, 184
on mastodon-ios, zero edges into any of them — dead ends in search and
the symbol view. The two extract()s are removed.

IceCubesApp's effect sweep is now URLSession-only network, no
telemetry, no database, keychain storage; its entry files drop from
eleven preview files to its one real script. SwiftPackageIndex's Fluent
database and reply steps are unchanged.

Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>

src/resolution/frameworks/swift.ts

@@ -8,6 +8,10 @@ import { Node } from '../../types';
 import { FrameworkResolver, UnresolvedRef, ResolvedRef, ResolutionContext } from '../types';
 import { stripCommentsForRegex } from '../strip-comments';
 
+// No extract(): a SwiftUI view is its own struct node, and a UIKit controller
+// its class. A one-line `component`/`class` twin per `struct X: View` (and per
+// `@main` app, view controller and UIView subclass) carried no edges and
+// showed up in search and the symbol view as a dead-end duplicate.
 export const swiftUIResolver: FrameworkResolver = {
   name: 'swiftui',
   languages: ['swift'],
@@ -76,61 +80,6 @@ export const swiftUIResolver: FrameworkResolver = {
 
     return null;
   },
-
-  extract(filePath, content) {
-    if (!filePath.endsWith('.swift')) return { nodes: [], references: [] };
-    const nodes: Node[] = [];
-    const now = Date.now();
-    const safe = stripCommentsForRegex(content, 'swift');
-
-    // Extract SwiftUI View structs
-    // struct ContentView: View { ... }
-    const viewPattern = /struct\s+(\w+)\s*:\s*(?:\w+\s*,\s*)*View/g;
-
-    let match: RegExpExecArray | null;
-    while ((match = viewPattern.exec(safe)) !== null) {
-      const [, viewName] = match;
-      const line = safe.slice(0, match.index).split('\n').length;
-
-      nodes.push({
-        id: `view:${filePath}:${viewName}:${line}`,
-        kind: 'component',
-        name: viewName!,
-        qualifiedName: `${filePath}::${viewName}`,
-        filePath,
-        startLine: line,
-        endLine: line,
-        startColumn: 0,
-        endColumn: match[0].length,
-        language: 'swift',
-        updatedAt: now,
-      });
-    }
-
-    // Extract @main App entry point
-    const appPattern = /@main\s+struct\s+(\w+)\s*:\s*App/g;
-
-    while ((match = appPattern.exec(safe)) !== null) {
-      const [, appName] = match;
-      const line = safe.slice(0, match.index).split('\n').length;
-
-      nodes.push({
-        id: `app:${filePath}:${appName}:${line}`,
-        kind: 'class',
-        name: appName!,
-        qualifiedName: `${filePath}::${appName}`,
-        filePath,
-        startLine: line,
-        endLine: line,
-        startColumn: 0,
-        endColumn: match[0].length,
-        language: 'swift',
-        updatedAt: now,
-      });
-    }
-
-    return { nodes, references: [] };
-  },
 };
 
 export const uikitResolver: FrameworkResolver = {
@@ -210,60 +159,6 @@ export const uikitResolver: FrameworkResolver = {
 
     return null;
   },
-
-  extract(filePath, content) {
-    if (!filePath.endsWith('.swift')) return { nodes: [], references: [] };
-    const nodes: Node[] = [];
-    const now = Date.now();
-    const safe = stripCommentsForRegex(content, 'swift');
-
-    // Extract UIViewController subclasses
-    const vcPattern = /class\s+(\w+)\s*:\s*(?:\w+\s*,\s*)*UIViewController/g;
-
-    let match: RegExpExecArray | null;
-    while ((match = vcPattern.exec(safe)) !== null) {
-      const [, vcName] = match;
-      const line = safe.slice(0, match.index).split('\n').length;
-
-      nodes.push({
-        id: `viewcontroller:${filePath}:${vcName}:${line}`,
-        kind: 'class',
-        name: vcName!,
-        qualifiedName: `${filePath}::${vcName}`,
-        filePath,
-        startLine: line,
-        endLine: line,
-        startColumn: 0,
-        endColumn: match[0].length,
-        language: 'swift',
-        updatedAt: now,
-      });
-    }
-
-    // Extract UIView subclasses
-    const viewPattern = /class\s+(\w+)\s*:\s*(?:\w+\s*,\s*)*UIView[^C]/g;
-
-    while ((match = viewPattern.exec(safe)) !== null) {
-      const [, viewName] = match;
-      const line = safe.slice(0, match.index).split('\n').length;
-
-      nodes.push({
-        id: `uiview:${filePath}:${viewName}:${line}`,
-        kind: 'class',
-        name: viewName!,
-        qualifiedName: `${filePath}::${viewName}`,
-        filePath,
-        startLine: line,
-        endLine: line,
-        startColumn: 0,
-        endColumn: match[0].length,
-        language: 'swift',
-        updatedAt: now,
-      });
-    }
-
-    return { nodes, references: [] };
-  },
 };
 
 export const vaporResolver: FrameworkResolver = {
@@ -547,7 +442,7 @@ function resolveVaporHandler(typePath: string | null, method: string, ref: Unres
 
 const SWIFT_TYPE_KINDS = new Set(['class', 'struct', 'enum', 'protocol']);
 
-const VIEW_KINDS = new Set(['struct', 'component']);
+const VIEW_KINDS = new Set(['struct']);
 const CLASS_KINDS = new Set(['class']);
 const MODEL_KINDS = new Set(['struct', 'class']);
 const PROTOCOL_KINDS = new Set(['protocol']);

src/resolution/swift-type-visibility.ts

@@ -64,21 +64,23 @@ export function isSwiftExtension(node: Node, context: ResolutionContext): boolea
   const hit = memo.get(node.id);
   if (hit !== undefined) return hit;
   const lines = linesOf(node.filePath, context);
-  let extension = false;
-  if (lines) {
-    const head = [
-      (lines[node.startLine - 1] ?? '').slice(node.startColumn),
-      ...lines.slice(node.startLine, Math.min(node.endLine, node.startLine + 4)),
-    ]
-      .join(' ')
-      // An attribute's string argument (`message: "use class Foo"`) is not a keyword.
-      .replace(/"(?:[^"\\\n]|\\.)*"/g, '""');
-    extension = DECLARATION_KEYWORD.exec(head)?.[1] === 'extension';
-  }
+  const extension = !!lines && declaresExtension(lines, node);
   memo.set(node.id, extension);
   return extension;
 }
 
+/** Does the class_declaration at `node`'s position open with `extension`? From the file's lines. */
+export function declaresExtension(lines: readonly string[], node: Pick<Node, 'startLine' | 'startColumn' | 'endLine'>): boolean {
+  const head = [
+    (lines[node.startLine - 1] ?? '').slice(node.startColumn),
+    ...lines.slice(node.startLine, Math.min(node.endLine, node.startLine + 4)),
+  ]
+    .join(' ')
+    // An attribute's string argument (`message: "use class Foo"`) is not a keyword.
+    .replace(/"(?:[^"\\\n]|\\.)*"/g, '""');
+  return DECLARATION_KEYWORD.exec(head)?.[1] === 'extension';
+}
+
 /** A declaration's inheritance clause: `struct HomeView: View, Sendable {` → `View, Sendable`. */
 const INHERITANCE_CLAUSE = /\b(?:class|struct|enum|actor|protocol|extension)\s+[A-Za-z_][\w.]*\s*(?:<[^{}]*?>)?\s*:\s*([^{]*?)\s*(?:\bwhere\b[^{]*)?\{/;