[Import Maps] Add internals.getParsedImportMap()

As a preparation for adding parser-related tests.

Bug: 990561
Change-Id: I8fdb07059514fe088438e8499cd4ac20e1c0b528
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1734328
Commit-Queue: Hiroshige Hayashizaki <hiroshige@chromium.org>
Reviewed-by: Kouhei Ueno <kouhei@chromium.org>
Cr-Commit-Position: refs/heads/master@{#686350}

third_party/blink/renderer/core/script/import_map.h

@@ -22,7 +22,8 @@ class ParsedSpecifier;
 // Import maps.
 // https://wicg.github.io/import-maps/
 // https://github.com/WICG/import-maps/blob/master/spec.md
-class ImportMap final : public GarbageCollectedFinalized<ImportMap> {
+class CORE_EXPORT ImportMap final
+    : public GarbageCollectedFinalized<ImportMap> {
  public:
   static ImportMap* Create(const Modulator& modulator_for_built_in_modules,
                            const String& text,

third_party/blink/renderer/core/script/modulator.h

@@ -178,6 +178,7 @@ class CORE_EXPORT Modulator : public GarbageCollectedFinalized<Modulator>,
   virtual void RegisterImportMap(const ImportMap*) = 0;
   virtual bool IsAcquiringImportMaps() const = 0;
   virtual void ClearIsAcquiringImportMaps() = 0;
+  virtual const ImportMap* GetImportMapForTest() const = 0;
 
   // https://html.spec.whatwg.org/C/#hostgetimportmetaproperties
   virtual ModuleImportMeta HostGetImportMetaProperties(ModuleRecord) const = 0;

third_party/blink/renderer/core/script/modulator_impl_base.h

@@ -77,6 +77,7 @@ class ModulatorImplBase : public Modulator {
                           const KURL&,
                           const ReferrerScriptInfo&,
                           ScriptPromiseResolver*) override;
+  const ImportMap* GetImportMapForTest() const final { return import_map_; }
   void RegisterImportMap(const ImportMap*) final;
   bool IsAcquiringImportMaps() const final { return acquiring_import_maps_; }
   void ClearIsAcquiringImportMaps() final { acquiring_import_maps_ = false; }

third_party/blink/renderer/core/testing/dummy_modulator.cc

@@ -138,6 +138,11 @@ void DummyModulator::ClearIsAcquiringImportMaps() {
   NOTREACHED();
 }
 
+const ImportMap* DummyModulator::GetImportMapForTest() const {
+  NOTREACHED();
+  return nullptr;
+}
+
 ModuleImportMeta DummyModulator::HostGetImportMetaProperties(
     ModuleRecord) const {
   NOTREACHED();

third_party/blink/renderer/core/testing/dummy_modulator.h

@@ -64,6 +64,7 @@ class DummyModulator : public Modulator {
   void RegisterImportMap(const ImportMap*) override;
   bool IsAcquiringImportMaps() const override;
   void ClearIsAcquiringImportMaps() override;
+  const ImportMap* GetImportMapForTest() const override;
   ModuleImportMeta HostGetImportMetaProperties(ModuleRecord) const override;
   ScriptValue InstantiateModule(v8::Local<v8::Module>, const KURL&) override;
   Vector<ModuleRequest> ModuleRequestsFromModuleRecord(

third_party/blink/renderer/core/testing/internals.cc

@@ -131,6 +131,7 @@
 #include "third_party/blink/renderer/core/paint/paint_layer.h"
 #include "third_party/blink/renderer/core/paint/paint_layer_scrollable_area.h"
 #include "third_party/blink/renderer/core/probe/core_probes.h"
+#include "third_party/blink/renderer/core/script/import_map.h"
 #include "third_party/blink/renderer/core/script/modulator.h"
 #include "third_party/blink/renderer/core/scroll/programmatic_scroll_animator.h"
 #include "third_party/blink/renderer/core/scroll/scroll_animator_base.h"
@@ -3480,6 +3481,23 @@ String Internals::resolveModuleSpecifier(const String& specifier,
   return result.GetString();
 }
 
+String Internals::getParsedImportMap(Document* document,
+                                     ExceptionState& exception_state) {
+  Modulator* modulator =
+      Modulator::From(ToScriptStateForMainWorld(document->GetFrame()));
+
+  if (!modulator) {
+    V8ThrowException::ThrowTypeError(v8::Isolate::GetCurrent(), "No modulator");
+    return String();
+  }
+
+  const ImportMap* import_map = modulator->GetImportMapForTest();
+  if (!import_map)
+    return "{}";
+
+  return import_map->ToString();
+}
+
 void Internals::setDeviceEmulationScale(float scale,
                                         ExceptionState& exception_state) {
   if (scale <= 0)

third_party/blink/renderer/core/testing/internals.h

@@ -333,6 +333,8 @@ class Internals final : public ScriptWrappable {
                                 Document*,
                                 ExceptionState&);
 
+  String getParsedImportMap(Document*, ExceptionState&);
+
   void SetDeviceProximity(Document*,
                           const String& event_type,
                           double value,

third_party/blink/renderer/core/testing/internals.idl

@@ -434,6 +434,12 @@
     // Used for testing Import Maps https://github.com/domenic/import-maps
     [RaisesException] DOMString resolveModuleSpecifier(DOMString specifier, DOMString base_url, Document document);
 
+    // Returns the current serialized import map of the Document.
+    // TODO(crbug.com/927181): Currently this returns the "imports" value,
+    // because Blink doesn't support scopes yet. Update this once scopes are
+    // implemented.
+    [RaisesException] DOMString getParsedImportMap(Document document);
+
     // Sets the scale for devtools device emulation.
     [RaisesException] void setDeviceEmulationScale(float scale);