diff -r 000000000000 -r 6474c204b198 layout/style/nsStyleUtil.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/layout/style/nsStyleUtil.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,142 @@
+/* -*- 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/. */
+#ifndef nsStyleUtil_h___
+#define nsStyleUtil_h___
+
+#include "nsCoord.h"
+#include "nsCSSProperty.h"
+#include "nsString.h"
+#include "nsTArrayForwardDeclare.h"
+
+class nsCSSValue;
+class nsStringComparator;
+class nsStyleCoord;
+class nsIContent;
+class nsIPrincipal;
+class nsIURI;
+struct gfxFontFeature;
+struct gfxAlternateValue;
+class nsCSSValueList;
+
+// Style utility functions
+class nsStyleUtil {
+public:
+
+ static bool DashMatchCompare(const nsAString& aAttributeValue,
+                                const nsAString& aSelectorValue,
+                                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.
+  // Returns false if |aIdent| contains U+0000
+  // Returns true for all other cases
+  static bool AppendEscapedCSSIdent(const nsAString& aIdent,
+                                    nsAString& aResult);
+
+  // Append a bitmask-valued property's value(s) (space-separated) to aResult.
+  static void AppendBitmaskCSSValue(nsCSSProperty aProperty,
+                                    int32_t aMaskedValue,
+                                    int32_t aFirstMask,
+                                    int32_t aLastMask,
+                                    nsAString& aResult);
+
+  static void AppendAngleValue(const nsStyleCoord& aValue, nsAString& aResult);
+
+  static void AppendPaintOrderValue(uint8_t aValue, nsAString& aResult);
+
+  static void AppendFontFeatureSettings(const nsTArray<gfxFontFeature>& aFeatures,
+                                        nsAString& aResult);
+
+  static void AppendFontFeatureSettings(const nsCSSValue& src,
+                                        nsAString& aResult);
+
+  static void AppendCSSNumber(float aNumber, nsAString& aResult)
+  {
+    aResult.AppendFloat(aNumber);
+  }
+
+  // convert bitmask value to keyword name for a functional alternate
+  static void GetFunctionalAlternatesName(int32_t aFeature,
+                                          nsAString& aFeatureName);
+
+  // Append functional font-variant-alternates values to string
+  static void
+  SerializeFunctionalAlternates(const nsTArray<gfxAlternateValue>& aAlternates,
+                                nsAString& aResult);
+
+  // List of functional font-variant-alternates values to feature/value pairs
+  static void
+  ComputeFunctionalAlternates(const nsCSSValueList* aList,
+                              nsTArray<gfxAlternateValue>& aAlternateValues);
+
+  /*
+   * 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 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);
+
+  /*
+   * Does this child count as significant for selector matching?
+   */
+  static bool IsSignificantChild(nsIContent* aChild,
+                                   bool aTextIsSignificant,
+                                   bool aWhitespaceIsSignificant);
+  /*
+   *  Does this principal 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 aPrincipal
+   *      The principal of the of the document (*not* of the style sheet).
+   *      The document's principal is where any Content Security Policy that
+   *      should be used to block or allow inline styles will be located.
+   *  @param aSourceURI
+   *      URI of document containing inline style (for reporting violations)
+   *  @param aLineNumber
+   *      Line 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(nsIContent* aContent,
+                                   nsIPrincipal* aPrincipal,
+                                   nsIURI* aSourceURI,
+                                   uint32_t aLineNumber,
+                                   const nsSubstring& aStyleText,
+                                   nsresult* aRv);
+
+};
+
+
+#endif /* nsStyleUtil_h___ */