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+/* -*- 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___ */