Adding upstream version 86.0.1.upstream/86.0.1upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 176 insertions, 0 deletions

diff --git a/layout/style/nsStyleUtil.h b/layout/style/nsStyleUtil.h
new file mode 100644
index 0000000000..20d5deb61b
--- /dev/null
+++ b/layout/style/nsStyleUtil.h
@@ -0,0 +1,176 @@
+/* -*- 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 nsStyleUtil_h___
+#define nsStyleUtil_h___
+
+#include "nsCoord.h"
+#include "nsCSSPropertyID.h"
+#include "nsTArrayForwardDeclare.h"
+#include "nsStringFwd.h"
+#include "nsCRT.h"
+#include "nsColor.h"
+#include "nsGkAtoms.h"
+
+class nsCSSValue;
+class nsIContent;
+class nsIPrincipal;
+class nsIURI;
+struct gfxFontFeature;
+struct nsCSSKTableEntry;
+struct nsCSSValueList;
+struct nsStylePosition;
+
+namespace mozilla {
+class FontSlantStyle;
+namespace dom {
+class Document;
+class Element;
+}  // namespace dom
+}  // namespace mozilla
+
+// Style utility functions
+class nsStyleUtil {
+ public:
+  static bool DashMatchCompare(const nsAString& aAttributeValue,
+                               const nsAString& aSelectorValue,
+                               const nsStringComparator& aComparator);
+
+  static bool ValueIncludes(const nsAString& aValueList,
+                            const nsAString& aValue,
+                            const nsStringComparator& aComparator);
+
+  // Append a quoted (with 'quoteChar') and escaped version of aString
+  // to aResult.  'quoteChar' must be ' or ".
+  static void AppendEscapedCSSString(const nsAString& aString,
+                                     nsAString& aResult,
+                                     char16_t quoteChar = '"');
+
+  // Append the identifier given by |aIdent| to |aResult|, with
+  // appropriate escaping so that it can be reparsed to the same
+  // identifier.  An exception is if aIdent contains U+0000, which
+  // will be escaped as U+FFFD and then reparsed back to U+FFFD.
+  static void AppendEscapedCSSIdent(const nsAString& aIdent,
+                                    nsAString& aResult);
+
+  static void AppendFontSlantStyle(const mozilla::FontSlantStyle&,
+                                   nsAString& aResult);
+
+ public:
+  static void AppendCSSNumber(float aNumber, nsAString& aResult) {
+    aResult.AppendFloat(aNumber);
+  }
+
+  /*
+   * Convert an author-provided floating point number to an integer (0
+   * ... 255) appropriate for use in the alpha component of a color.
+   */
+  static uint8_t FloatToColorComponent(float aAlpha) {
+    NS_ASSERTION(0.0 <= aAlpha && aAlpha <= 1.0, "out of range");
+    return static_cast<uint8_t>(NSToIntRound(aAlpha * 255));
+  }
+
+  /*
+   * Convert the alpha component of an nscolor (0 ... 255) to the
+   * floating point number with the least accurate *decimal*
+   * representation that is converted to that color.
+   *
+   * Should be used only by serialization code.
+   */
+  static float ColorComponentToFloat(uint8_t aAlpha);
+
+  /**
+   * GetSerializedColorValue() computes serialized color value of aColor and
+   * returns it with aSerializedColor.
+   * https://drafts.csswg.org/cssom/#serialize-a-css-component-value
+   */
+  static void GetSerializedColorValue(nscolor aColor,
+                                      nsAString& aSerializedColor);
+
+  /*
+   * Does this child count as significant for selector matching?
+   */
+  static bool IsSignificantChild(nsIContent* aChild,
+                                 bool aWhitespaceIsSignificant);
+
+  /*
+   * Thread-safe version of IsSignificantChild()
+   */
+  static bool ThreadSafeIsSignificantChild(const nsIContent* aChild,
+                                           bool aWhitespaceIsSignificant);
+  /**
+   * Returns true if our object-fit & object-position properties might cause
+   * a replaced element's contents to overflow its content-box (requiring
+   * clipping), or false if we can be sure that this won't happen.
+   *
+   * This lets us optimize by skipping clipping when we can tell it's
+   * unnecessary (particularly with the default values of these properties).
+   *
+   * @param aStylePos The nsStylePosition whose object-fit & object-position
+   *                  properties should be checked for potential overflow.
+   * @return false if we can be sure that the object-fit & object-position
+   *         properties on 'aStylePos' cannot cause a replaced element's
+   *         contents to overflow its content-box. Otherwise (if overflow is
+   *         is possible), returns true.
+   */
+  static bool ObjectPropsMightCauseOverflow(const nsStylePosition* aStylePos);
+
+  /*
+   *  Does the document have a CSP that blocks the application of
+   *  inline styles? Returns false if application of the style should
+   *  be blocked.
+   *
+   *  @param aContent
+   *      The <style> element that the caller wants to know whether to honor.
+   *      Included to check the nonce attribute if one is provided. Allowed to
+   *      be null, if this is for something other than a <style> element (in
+   *      which case nonces won't be checked).
+   *  @param aDocument
+   *      The document containing the inline style (for querying the CSP);
+   *  @param aTriggeringPrincipal
+   *      The principal of the scripted caller which added the inline
+   *      stylesheet, or null if no scripted caller can be identified.
+   *  @param aLineNumber
+   *      Line number of inline style element in the containing document (for
+   *      reporting violations)
+   *  @param aColumnNumber
+   *      Column number of inline style element in the containing document (for
+   *      reporting violations)
+   *  @param aStyleText
+   *      Contents of the inline style element (for reporting violations)
+   *  @param aRv
+   *      Return error code in case of failure
+   *  @return
+   *      Does CSP allow application of the specified inline style?
+   */
+  static bool CSPAllowsInlineStyle(mozilla::dom::Element* aContent,
+                                   mozilla::dom::Document* aDocument,
+                                   nsIPrincipal* aTriggeringPrincipal,
+                                   uint32_t aLineNumber, uint32_t aColumnNumber,
+                                   const nsAString& aStyleText, nsresult* aRv);
+
+  template <size_t N>
+  static bool MatchesLanguagePrefix(const char16_t* aLang, size_t aLen,
+                                    const char16_t (&aPrefix)[N]) {
+    return !NS_strncmp(aLang, aPrefix, N - 1) &&
+           (aLen == N - 1 || aLang[N - 1] == '-');
+  }
+
+  template <size_t N>
+  static bool MatchesLanguagePrefix(const nsAtom* aLang,
+                                    const char16_t (&aPrefix)[N]) {
+    MOZ_ASSERT(aLang);
+    return MatchesLanguagePrefix(aLang->GetUTF16String(), aLang->GetLength(),
+                                 aPrefix);
+  }
+
+  template <size_t N>
+  static bool MatchesLanguagePrefix(const nsAString& aLang,
+                                    const char16_t (&aPrefix)[N]) {
+    return MatchesLanguagePrefix(aLang.Data(), aLang.Length(), aPrefix);
+  }
+};
+
+#endif /* nsStyleUtil_h___ */