1 files changed, 141 insertions, 0 deletions
diff --git a/layout/style/Rule.h b/layout/style/Rule.h
new file mode 100644
index 000000000..7abe71174
--- /dev/null
+++ b/layout/style/Rule.h
@@ -0,0 +1,141 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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/. */
+
+/* base class for all rule types in a CSS style sheet */
+
+#ifndef mozilla_css_Rule_h___
+#define mozilla_css_Rule_h___
+
+#include "mozilla/StyleSheetInlines.h"
+#include "mozilla/MemoryReporting.h"
+#include "nsISupports.h"
+#include "nsIDOMCSSRule.h"
+
+class nsIDocument;
+struct nsRuleData;
+template<class T> struct already_AddRefed;
+class nsHTMLCSSStyleSheet;
+
+namespace mozilla {
+namespace css {
+class GroupRule;
+
+#define DECL_STYLE_RULE_INHERIT_NO_DOMRULE  \
+ /* nothing */
+
+#define DECL_STYLE_RULE_INHERIT                            \
+  DECL_STYLE_RULE_INHERIT_NO_DOMRULE                       \
+  virtual nsIDOMCSSRule* GetDOMRule() override;        \
+  virtual nsIDOMCSSRule* GetExistingDOMRule() override;
+
+class Rule : public nsISupports {
+protected:
+  Rule(uint32_t aLineNumber, uint32_t aColumnNumber)
+    : mSheet(nullptr),
+      mParentRule(nullptr),
+      mLineNumber(aLineNumber),
+      mColumnNumber(aColumnNumber)
+  {
+  }
+
+  Rule(const Rule& aCopy)
+    : mSheet(aCopy.mSheet),
+      mParentRule(aCopy.mParentRule),
+      mLineNumber(aCopy.mLineNumber),
+      mColumnNumber(aCopy.mColumnNumber)
+  {
+  }
+
+  virtual ~Rule() {}
+
+public:
+
+#ifdef DEBUG
+  virtual void List(FILE* out = stdout, int32_t aIndent = 0) const = 0;
+#endif
+
+  // The constants in this list must maintain the following invariants:
+  //   If a rule of type N must appear before a rule of type M in stylesheets
+  //   then N < M
+  // Note that CSSStyleSheet::RebuildChildList assumes that no other kinds of
+  // rules can come between two rules of type IMPORT_RULE.
+  enum {
+    UNKNOWN_RULE = 0,
+    CHARSET_RULE,
+    IMPORT_RULE,
+    NAMESPACE_RULE,
+    STYLE_RULE,
+    MEDIA_RULE,
+    FONT_FACE_RULE,
+    PAGE_RULE,
+    KEYFRAME_RULE,
+    KEYFRAMES_RULE,
+    DOCUMENT_RULE,
+    SUPPORTS_RULE,
+    FONT_FEATURE_VALUES_RULE,
+    COUNTER_STYLE_RULE
+  };
+
+  virtual int32_t GetType() const = 0;
+
+  CSSStyleSheet* GetStyleSheet() const { return mSheet; }
+
+  // Return the document the rule lives in, if any
+  nsIDocument* GetDocument() const
+  {
+    CSSStyleSheet* sheet = GetStyleSheet();
+    return sheet ? sheet->GetDocument() : nullptr;
+  }
+
+  virtual void SetStyleSheet(CSSStyleSheet* aSheet);
+
+  void SetParentRule(GroupRule* aRule) {
+    // We don't reference count this up reference. The group rule
+    // will tell us when it's going away or when we're detached from
+    // it.
+    mParentRule = aRule;
+  }
+
+  uint32_t GetLineNumber() const { return mLineNumber; }
+  uint32_t GetColumnNumber() const { return mColumnNumber; }
+
+  /**
+   * Clones |this|. Never returns nullptr.
+   */
+  virtual already_AddRefed<Rule> Clone() const = 0;
+
+  // Note that this returns null for inline style rules since they aren't
+  // supposed to have a DOM rule representation (and our code wouldn't work).
+  virtual nsIDOMCSSRule* GetDOMRule() = 0;
+
+  // Like GetDOMRule(), but won't create one if we don't have one yet
+  virtual nsIDOMCSSRule* GetExistingDOMRule() = 0;
+
+  // to implement methods on nsIDOMCSSRule
+  nsresult GetParentRule(nsIDOMCSSRule** aParentRule);
+  nsresult GetParentStyleSheet(nsIDOMCSSStyleSheet** aSheet);
+  Rule* GetCSSRule();
+
+  // This is pure virtual because all of Rule's data members are non-owning and
+  // thus measured elsewhere.
+  virtual size_t SizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf)
+    const MOZ_MUST_OVERRIDE = 0;
+
+protected:
+  // This is sometimes null (e.g., for style attributes).
+  CSSStyleSheet*    mSheet;
+  // When the parent GroupRule is destroyed, it will call SetParentRule(nullptr)
+  // on this object. (Through SetParentRuleReference);
+  GroupRule* MOZ_NON_OWNING_REF mParentRule;
+
+  // Keep the same type so that MSVC packs them.
+  uint32_t          mLineNumber;
+  uint32_t          mColumnNumber;
+};
+
+} // namespace css
+} // namespace mozilla
+
+#endif /* mozilla_css_Rule_h___ */