1 files changed, 130 insertions, 0 deletions
diff --git a/dom/base/WindowFeatures.h b/dom/base/WindowFeatures.h
new file mode 100644
index 0000000000..cb070bb765
--- /dev/null
+++ b/dom/base/WindowFeatures.h
@@ -0,0 +1,130 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_dom_WindowFeatures_h
+#define mozilla_dom_WindowFeatures_h
+
+#include "nsString.h"
+#include "mozilla/Assertions.h"  // MOZ_ASSERT
+#include "mozilla/HashTable.h"   // mozilla::HashMap
+
+#include "nsStringFwd.h"  // nsCString, nsACString, nsAutoCString, nsLiteralCString
+#include "nsTStringHasher.h"  // mozilla::DefaultHasher<nsCString>
+
+namespace mozilla::dom {
+
+// Represents `tokenizedFeatures` in
+// https://html.spec.whatwg.org/multipage/window-object.html#concept-window-open-features-tokenize
+// with accessor methods for values.
+class WindowFeatures {
+ public:
+  WindowFeatures() = default;
+
+  WindowFeatures(const WindowFeatures& aOther) = delete;
+  WindowFeatures& operator=(const WindowFeatures& aOther) = delete;
+
+  WindowFeatures(WindowFeatures&& aOther) = delete;
+  WindowFeatures& operator=(WindowFeatures&& aOther) = delete;
+
+  // Tokenizes `aFeatures` and stores the result map in member field.
+  // This should be called at the begining, only once.
+  //
+  // Returns true if successfully tokenized, false otherwise.
+  bool Tokenize(const nsACString& aFeatures);
+
+  // Returns true if the `aName` feature is specified.
+  template <size_t N>
+  bool Exists(const char (&aName)[N]) const {
+    MOZ_ASSERT(IsLowerCase(aName));
+    nsLiteralCString name(aName);
+    return tokenizedFeatures_.has(name);
+  }
+
+  // Returns string value of `aName` feature.
+  // The feature must exist.
+  template <size_t N>
+  const nsCString& Get(const char (&aName)[N]) const {
+    MOZ_ASSERT(IsLowerCase(aName));
+    nsLiteralCString name(aName);
+    auto p = tokenizedFeatures_.lookup(name);
+    MOZ_ASSERT(p.found());
+
+    return p->value();
+  }
+
+  // Returns integer value of `aName` feature.
+  // The feature must exist.
+  template <size_t N>
+  int32_t GetInt(const char (&aName)[N]) const {
+    const nsCString& value = Get(aName);
+    return ParseIntegerWithFallback(value);
+  }
+
+  // Returns bool value of `aName` feature.
+  // The feature must exist.
+  template <size_t N>
+  bool GetBool(const char (&aName)[N]) const {
+    const nsCString& value = Get(aName);
+    return ParseBool(value);
+  }
+
+  // Returns bool value of `aName` feature.
+  // If the feature doesn't exist, returns `aDefault`.
+  //
+  // If `aPresenceFlag` is provided and the feature exists, it's set to `true`.
+  // (note that the value isn't overwritten if the feature doesn't exist)
+  template <size_t N>
+  bool GetBoolWithDefault(const char (&aName)[N], bool aDefault,
+                          bool* aPresenceFlag = nullptr) const {
+    MOZ_ASSERT(IsLowerCase(aName));
+    nsLiteralCString name(aName);
+    auto p = tokenizedFeatures_.lookup(name);
+    if (p.found()) {
+      if (aPresenceFlag) {
+        *aPresenceFlag = true;
+      }
+      return ParseBool(p->value());
+    }
+    return aDefault;
+  }
+
+  // Remove the feature from the map.
+  template <size_t N>
+  void Remove(const char (&aName)[N]) {
+    MOZ_ASSERT(IsLowerCase(aName));
+    nsLiteralCString name(aName);
+    tokenizedFeatures_.remove(name);
+  }
+
+  // Returns true if there was no feature specified, or all features are
+  // removed by `Remove`.
+  //
+  // Note that this can be true even if `aFeatures` parameter of `Tokenize`
+  // is not empty, in case it contains no feature with non-empty name.
+  bool IsEmpty() const { return tokenizedFeatures_.empty(); }
+
+  // Stringify the map into `aOutput`.
+  // The result can be parsed again with `Tokenize`.
+  void Stringify(nsAutoCString& aOutput);
+
+ private:
+#ifdef DEBUG
+  // Returns true if `text` does not contain any character that gets modified by
+  // `ToLowerCase`.
+  static bool IsLowerCase(const char* text);
+#endif
+
+  static int32_t ParseIntegerWithFallback(const nsCString& aValue);
+  static bool ParseBool(const nsCString& aValue);
+
+  // A map from feature name to feature value.
+  // If value is not provided, it's empty string.
+  mozilla::HashMap<nsCString, nsCString> tokenizedFeatures_;
+};
+
+}  // namespace mozilla::dom
+
+#endif  // #ifndef mozilla_dom_WindowFeatures_h