[ffigen] Vibe coded prototype of transformer API

pkgs/code_assets/example/host_name/tool/ffigen.dart

@@ -8,12 +8,12 @@ import 'package:ffigen/ffigen.dart';
 
 void main() {
   final packageRoot = Platform.script.resolve('../');
-  final functions = Functions.includeSet({'gethostname'});
+  const visitors = [IncludeSetVisitor({'gethostname'})];
   final FfiGenerator generator;
   if (Platform.isWindows) {
     generator = FfiGenerator(
       headers: Headers(entryPoints: [packageRoot.resolve('src/windows.h')]),
-      functions: functions,
+      visitors: visitors,
       output: Output(
         dartFile: packageRoot.resolve('lib/src/third_party/windows.dart'),
         preamble: '''
@@ -27,7 +27,7 @@ void main() {
   } else {
     generator = FfiGenerator(
       headers: Headers(entryPoints: [packageRoot.resolve('src/unix.h')]),
-      functions: functions,
+      visitors: visitors,
       output: Output(
         dartFile: packageRoot.resolve('lib/src/third_party/unix.dart'),
         preamble: '''

pkgs/code_assets/example/mini_audio/tool/ffigen.dart

@@ -12,21 +12,17 @@ void main() {
     headers: Headers(
       entryPoints: [packageRoot.resolve('third_party/miniaudio.h')],
     ),
-    functions: Functions(
-      include: (decl) => {
+    visitors: const [
+      IncludeSetVisitor({
         'ma_engine_init',
         'ma_engine_play_sound',
         'ma_engine_uninit',
-      }.contains(decl.originalName),
-      recordUse: (_) => true,
-    ),
-    structs: Structs(
-      include: (decl) => {'ma_engine'}.contains(decl.originalName),
-    ),
-    enums: Enums(
-      include: (decl) => {'ma_result'}.contains(decl.originalName),
-      silenceWarning: true,
-    ),
+        'ma_engine',
+        'ma_result',
+      }),
+      RecordUseVisitor(),
+    ],
+    enums: const Enums(silenceWarning: true),
     output: Output(
       dartFile: packageRoot.resolve('lib/src/third_party/miniaudio.g.dart'),
       recordUseMapping: packageRoot.resolve(

pkgs/code_assets/example/sqlite/tool/ffigen.dart

@@ -12,10 +12,10 @@ void main() {
     headers: Headers(
       entryPoints: [packageRoot.resolve('third_party/sqlite/sqlite3.h')],
     ),
-    functions: Functions(
-      include: (decl) => {'sqlite3_libversion'}.contains(decl.originalName),
-      recordUse: (_) => true,
-    ),
+    visitors: const [
+      IncludeSetVisitor({'sqlite3_libversion'}),
+      RecordUseVisitor(),
+    ],
     output: Output(
       dartFile: packageRoot.resolve('lib/src/third_party/sqlite3.g.dart'),
       recordUseMapping: packageRoot.resolve(

pkgs/code_assets/example/sqlite_no_link/tool/ffigen.dart

@@ -12,7 +12,10 @@ void main() {
     headers: Headers(
       entryPoints: [packageRoot.resolve('third_party/sqlite/sqlite3.h')],
     ),
-    functions: Functions.includeSet({'sqlite3_libversion'}),
+    visitors: const [
+      IncludeSetVisitor({'sqlite3_libversion'}),
+      RecordUseVisitor(),
+    ],
     output: Output(
       dartFile: packageRoot.resolve('lib/src/third_party/sqlite3.g.dart'),
       preamble: '''

pkgs/code_assets/example/sqlite_prebuilt/tool/ffigen.dart

@@ -12,7 +12,10 @@ void main() {
     headers: Headers(
       entryPoints: [packageRoot.resolve('third_party/sqlite/sqlite3.h')],
     ),
-    functions: Functions.includeSet({'sqlite3_libversion'}),
+    visitors: const [
+      IncludeSetVisitor({'sqlite3_libversion'}),
+      RecordUseVisitor(),
+    ],
     output: Output(
       dartFile: packageRoot.resolve('lib/src/third_party/sqlite3.g.dart'),
       preamble: '''

pkgs/code_assets/example/stb_image/tool/ffigen.dart

@@ -12,10 +12,10 @@ void main() {
     headers: Headers(
       entryPoints: [packageRoot.resolve('third_party/stb_image.h')],
     ),
-    functions: Functions(
-      include: (decl) => {'stbi_info'}.contains(decl.originalName),
-      recordUse: (_) => true,
-    ),
+    visitors: const [
+      IncludeSetVisitor({'stbi_info'}),
+      RecordUseVisitor(),
+    ],
     output: Output(
       dartFile: packageRoot.resolve('lib/src/third_party/stb_image.g.dart'),
       recordUseMapping: packageRoot.resolve(

pkgs/ffigen/example/add/tool/ffigen.dart

@@ -9,7 +9,9 @@ FfiGenerator getConfig(Uri packageRoot) {
   return FfiGenerator(
     output: Output(dartFile: packageRoot.resolve('lib/add.g.dart')),
     headers: Headers(entryPoints: [packageRoot.resolve('src/add.h')]),
-    functions: Functions.includeSet({'add'}),
+    visitors: [
+      const IncludeSetVisitor({'add'}),
+    ],
   );
 }
 

pkgs/ffigen/example/ffinative/lib/generated_bindings.dart

@@ -24,7 +24,6 @@ external ffi.Pointer<ffi.Float> divide(int a, int b);
 @ffi.Native<ffi.Pointer<ffi.Double> Function(ffi.Float, ffi.Float)>()
 external ffi.Pointer<ffi.Double> dividePrecision(double a, double b);
 
-/// Version of the native C library
 @ffi.Native<ffi.Pointer<ffi.Char>>()
 external final ffi.Pointer<ffi.Char> library_version;