зеркало из https://github.com/mozilla/gecko-dev.git
238 строки
9.3 KiB
C++
238 строки
9.3 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef nsStyleUtil_h___
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#define nsStyleUtil_h___
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#include "nsCoord.h"
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#include "nsCSSPropertyID.h"
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#include "nsString.h"
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#include "nsTArrayForwardDeclare.h"
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#include "gfxFontFamilyList.h"
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#include "nsStringFwd.h"
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#include "nsStyleStruct.h"
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#include "nsCRT.h"
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class nsCSSValue;
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class nsStyleCoord;
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class nsIContent;
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class nsIPrincipal;
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class nsIURI;
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struct gfxFontFeature;
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struct gfxAlternateValue;
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struct nsCSSValueList;
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// Style utility functions
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class nsStyleUtil {
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public:
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static bool DashMatchCompare(const nsAString& aAttributeValue,
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const nsAString& aSelectorValue,
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const nsStringComparator& aComparator);
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static bool ValueIncludes(const nsAString& aValueList,
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const nsAString& aValue,
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const nsStringComparator& aComparator);
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// Append a quoted (with 'quoteChar') and escaped version of aString
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// to aResult. 'quoteChar' must be ' or ".
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static void AppendEscapedCSSString(const nsAString& aString,
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nsAString& aResult,
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char16_t quoteChar = '"');
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// Append the identifier given by |aIdent| to |aResult|, with
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// appropriate escaping so that it can be reparsed to the same
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// identifier. An exception is if aIdent contains U+0000, which
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// will be escaped as U+FFFD and then reparsed back to U+FFFD.
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static void AppendEscapedCSSIdent(const nsAString& aIdent,
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nsAString& aResult);
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static void
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AppendEscapedCSSFontFamilyList(const mozilla::FontFamilyList& aFamilyList,
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nsAString& aResult);
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static void
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AppendEscapedCSSFontFamilyList(mozilla::SharedFontList* aFontlist,
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nsAString& aResult)
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{
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AppendEscapedCSSFontFamilyList(aFontlist->mNames, aResult);
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}
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private:
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static void
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AppendEscapedCSSFontFamilyList(const nsTArray<mozilla::FontFamilyName>& aNames,
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nsAString& aResult);
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public:
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// Append a bitmask-valued property's value(s) (space-separated) to aResult.
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static void AppendBitmaskCSSValue(nsCSSPropertyID aProperty,
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int32_t aMaskedValue,
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int32_t aFirstMask,
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int32_t aLastMask,
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nsAString& aResult);
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static void AppendAngleValue(const nsStyleCoord& aValue, nsAString& aResult);
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static void AppendPaintOrderValue(uint8_t aValue, nsAString& aResult);
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static void AppendFontTagAsString(uint32_t aTag, nsAString& aResult);
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static void AppendFontFeatureSettings(const nsTArray<gfxFontFeature>& aFeatures,
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nsAString& aResult);
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static void AppendFontFeatureSettings(const nsCSSValue& src,
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nsAString& aResult);
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static void AppendFontVariationSettings(const nsTArray<gfxFontVariation>& aVariations,
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nsAString& aResult);
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static void AppendFontVariationSettings(const nsCSSValue& src,
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nsAString& aResult);
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static void AppendUnicodeRange(const nsCSSValue& aValue, nsAString& aResult);
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static void AppendCSSNumber(float aNumber, nsAString& aResult)
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{
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aResult.AppendFloat(aNumber);
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}
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static void AppendStepsTimingFunction(nsTimingFunction::Type aType,
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uint32_t aSteps,
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nsAString& aResult);
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static void AppendFramesTimingFunction(uint32_t aFrames,
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nsAString& aResult);
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static void AppendCubicBezierTimingFunction(float aX1, float aY1,
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float aX2, float aY2,
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nsAString& aResult);
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static void AppendCubicBezierKeywordTimingFunction(
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nsTimingFunction::Type aType,
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nsAString& aResult);
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static void AppendSerializedFontSrc(const nsCSSValue& aValue,
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nsAString& aResult);
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// convert bitmask value to keyword name for a functional alternate
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static void GetFunctionalAlternatesName(int32_t aFeature,
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nsAString& aFeatureName);
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// Append functional font-variant-alternates values to string
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static void
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SerializeFunctionalAlternates(const nsTArray<gfxAlternateValue>& aAlternates,
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nsAString& aResult);
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// List of functional font-variant-alternates values to feature/value pairs
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static void
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ComputeFunctionalAlternates(const nsCSSValueList* aList,
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nsTArray<gfxAlternateValue>& aAlternateValues);
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/*
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* Convert an author-provided floating point number to an integer (0
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* ... 255) appropriate for use in the alpha component of a color.
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*/
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static uint8_t FloatToColorComponent(float aAlpha)
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{
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NS_ASSERTION(0.0 <= aAlpha && aAlpha <= 1.0, "out of range");
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return NSToIntRound(aAlpha * 255);
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}
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/*
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* Convert the alpha component of an nscolor (0 ... 255) to the
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* floating point number with the least accurate *decimal*
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* representation that is converted to that color.
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*
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* Should be used only by serialization code.
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*/
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static float ColorComponentToFloat(uint8_t aAlpha);
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/*
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* Does this child count as significant for selector matching?
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*/
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static bool IsSignificantChild(nsIContent* aChild,
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bool aTextIsSignificant,
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bool aWhitespaceIsSignificant);
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/*
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* Thread-safe version of IsSignificantChild()
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*/
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static bool ThreadSafeIsSignificantChild(const nsIContent* aChild,
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bool aTextIsSignificant,
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bool aWhitespaceIsSignificant);
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/**
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* Returns true if our object-fit & object-position properties might cause
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* a replaced element's contents to overflow its content-box (requiring
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* clipping), or false if we can be sure that this won't happen.
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*
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* This lets us optimize by skipping clipping when we can tell it's
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* unnecessary (particularly with the default values of these properties).
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*
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* @param aStylePos The nsStylePosition whose object-fit & object-position
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* properties should be checked for potential overflow.
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* @return false if we can be sure that the object-fit & object-position
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* properties on 'aStylePos' cannot cause a replaced element's
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* contents to overflow its content-box. Otherwise (if overflow is
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* is possible), returns true.
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*/
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static bool ObjectPropsMightCauseOverflow(const nsStylePosition* aStylePos);
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/*
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* Does this principal have a CSP that blocks the application of
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* inline styles? Returns false if application of the style should
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* be blocked.
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*
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* @param aContent
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* The <style> element that the caller wants to know whether to honor.
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* Included to check the nonce attribute if one is provided. Allowed to
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* be null, if this is for something other than a <style> element (in
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* which case nonces won't be checked).
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* @param aPrincipal
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* The principal of the of the document (*not* of the style sheet).
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* The document's principal is where any Content Security Policy that
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* should be used to block or allow inline styles will be located.
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* @param aSourceURI
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* URI of document containing inline style (for reporting violations)
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* @param aLineNumber
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* Line number of inline style element in the containing document (for
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* reporting violations)
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* @param aStyleText
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* Contents of the inline style element (for reporting violations)
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* @param aRv
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* Return error code in case of failure
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* @return
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* Does CSP allow application of the specified inline style?
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*/
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static bool CSPAllowsInlineStyle(nsIContent* aContent,
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nsIPrincipal* aPrincipal,
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nsIURI* aSourceURI,
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uint32_t aLineNumber,
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const nsAString& aStyleText,
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nsresult* aRv);
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template<size_t N>
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static bool MatchesLanguagePrefix(const char16_t* aLang, size_t aLen,
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const char16_t (&aPrefix)[N])
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{
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return !nsCRT::strncmp(aLang, aPrefix, N - 1) &&
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(aLen == N - 1 || aLang[N - 1] == '-');
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}
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template<size_t N>
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static bool MatchesLanguagePrefix(const nsAtom* aLang,
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const char16_t (&aPrefix)[N])
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{
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MOZ_ASSERT(aLang);
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return MatchesLanguagePrefix(aLang->GetUTF16String(),
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aLang->GetLength(), aPrefix);
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}
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template<size_t N>
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static bool MatchesLanguagePrefix(const nsAString& aLang,
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const char16_t (&aPrefix)[N])
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{
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return MatchesLanguagePrefix(aLang.Data(), aLang.Length(), aPrefix);
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}
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};
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#endif /* nsStyleUtil_h___ */
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