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gecko-dev/layout/style/nsCSSProps.h

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/* -*- 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/. */
/*
* methods for dealing with CSS properties and tables of the keyword
* values they accept
*/
#ifndef nsCSSProps_h___
#define nsCSSProps_h___
#include <limits>
#include <type_traits>
#include "nsStringFwd.h"
#include "nsCSSPropertyID.h"
#include "nsStyleStructFwd.h"
#include "nsCSSKeywords.h"
#include "mozilla/CSSEnabledState.h"
#include "mozilla/CSSPropFlags.h"
#include "mozilla/UseCounter.h"
#include "mozilla/EnumTypeTraits.h"
#include "mozilla/Preferences.h"
#include "nsXULAppAPI.h"
// Length of the "--" prefix on custom names (such as custom property names,
// and, in the future, custom media query names).
#define CSS_CUSTOM_NAME_PREFIX_LENGTH 2
struct nsCSSKTableEntry
{
// nsCSSKTableEntry objects can be initialized either with an int16_t value
// or a value of an enumeration type that can fit within an int16_t.
constexpr nsCSSKTableEntry(nsCSSKeyword aKeyword, int16_t aValue)
: mKeyword(aKeyword)
, mValue(aValue)
{
}
template<typename T,
typename = typename std::enable_if<std::is_enum<T>::value>::type>
constexpr nsCSSKTableEntry(nsCSSKeyword aKeyword, T aValue)
: mKeyword(aKeyword)
, mValue(static_cast<int16_t>(aValue))
{
static_assert(mozilla::EnumTypeFitsWithin<T, int16_t>::value,
"aValue must be an enum that fits within mValue");
}
bool IsSentinel() const
{
return mKeyword == eCSSKeyword_UNKNOWN && mValue == -1;
}
nsCSSKeyword mKeyword;
int16_t mValue;
};
class nsCSSProps {
public:
typedef mozilla::CSSEnabledState EnabledState;
typedef mozilla::CSSPropFlags Flags;
typedef nsCSSKTableEntry KTableEntry;
static void AddRefTable(void);
static void ReleaseTable(void);
// Looks up the property with name aProperty and returns its corresponding
// nsCSSPropertyID value. If aProperty is the name of a custom property,
// then eCSSPropertyExtra_variable will be returned.
static nsCSSPropertyID LookupProperty(const nsAString& aProperty,
EnabledState aEnabled);
// As above, but looked up using a property's IDL name.
// eCSSPropertyExtra_variable won't be returned from these methods.
static nsCSSPropertyID LookupPropertyByIDLName(
const nsAString& aPropertyIDLName,
EnabledState aEnabled);
static nsCSSPropertyID LookupPropertyByIDLName(
const nsACString& aPropertyIDLName,
EnabledState aEnabled);
// Returns whether aProperty is a custom property name, i.e. begins with
// "--". This assumes that the CSS Variables pref has been enabled.
static bool IsCustomPropertyName(const nsAString& aProperty);
static inline bool IsShorthand(nsCSSPropertyID aProperty) {
MOZ_ASSERT(0 <= aProperty && aProperty < eCSSProperty_COUNT,
"out of range");
return (aProperty >= eCSSProperty_COUNT_no_shorthands);
}
// Same but for @font-face descriptors
static nsCSSFontDesc LookupFontDesc(const nsAString& aProperty);
// Given a property enum, get the string value
static const nsCString& GetStringValue(nsCSSPropertyID aProperty);
static const nsCString& GetStringValue(nsCSSFontDesc aFontDesc);
static const nsCString& GetStringValue(nsCSSCounterDesc aCounterDesc);
// Returns the index of |aKeyword| in |aTable|, if it exists there;
// otherwise, returns -1.
// NOTE: Generally, clients should call FindKeyword() instead of this method.
static int32_t FindIndexOfKeyword(nsCSSKeyword aKeyword,
const KTableEntry aTable[]);
// Find |aKeyword| in |aTable|, if found set |aValue| to its corresponding value.
// If not found, return false and do not set |aValue|.
static bool FindKeyword(nsCSSKeyword aKeyword, const KTableEntry aTable[],
int32_t& aValue);
// Return the first keyword in |aTable| that has the corresponding value |aValue|.
// Return |eCSSKeyword_UNKNOWN| if not found.
static nsCSSKeyword ValueToKeywordEnum(int32_t aValue,
const KTableEntry aTable[]);
template<typename T,
typename = typename std::enable_if<std::is_enum<T>::value>::type>
static nsCSSKeyword ValueToKeywordEnum(T aValue,
const KTableEntry aTable[])
{
static_assert(mozilla::EnumTypeFitsWithin<T, int16_t>::value,
"aValue must be an enum that fits within KTableEntry::mValue");
return ValueToKeywordEnum(static_cast<int16_t>(aValue), aTable);
}
// Ditto but as a string, return "" when not found.
static const nsCString& ValueToKeyword(int32_t aValue,
const KTableEntry aTable[]);
template<typename T,
typename = typename std::enable_if<std::is_enum<T>::value>::type>
static const nsCString& ValueToKeyword(T aValue, const KTableEntry aTable[])
{
static_assert(mozilla::EnumTypeFitsWithin<T, int16_t>::value,
"aValue must be an enum that fits within KTableEntry::mValue");
return ValueToKeyword(static_cast<int16_t>(aValue), aTable);
}
private:
static const Flags kFlagsTable[eCSSProperty_COUNT];
public:
static inline bool PropHasFlags(nsCSSPropertyID aProperty, Flags aFlags)
{
MOZ_ASSERT(0 <= aProperty && aProperty < eCSSProperty_COUNT,
"out of range");
return (nsCSSProps::kFlagsTable[aProperty] & aFlags) == aFlags;
}
private:
// A table for shorthand properties. The appropriate index is the
// property ID minus eCSSProperty_COUNT_no_shorthands.
static const nsCSSPropertyID *const
kSubpropertyTable[eCSSProperty_COUNT - eCSSProperty_COUNT_no_shorthands];
public:
static inline
const nsCSSPropertyID * SubpropertyEntryFor(nsCSSPropertyID aProperty) {
MOZ_ASSERT(eCSSProperty_COUNT_no_shorthands <= aProperty &&
aProperty < eCSSProperty_COUNT,
"out of range");
return nsCSSProps::kSubpropertyTable[aProperty -
eCSSProperty_COUNT_no_shorthands];
}
private:
static bool gPropertyEnabled[eCSSProperty_COUNT_with_aliases];
private:
// Defined in the generated nsCSSPropsGenerated.inc.
static const char* const kIDLNameTable[eCSSProperty_COUNT];
public:
/**
* Returns the IDL name of the specified property, which must be a
* longhand, logical or shorthand property. The IDL name is the property
* name with any hyphen-lowercase character pairs replaced by an
* uppercase character:
* https://drafts.csswg.org/cssom/#css-property-to-idl-attribute
*
* As a special case, the string "cssFloat" is returned for the float
* property. nullptr is returned for internal properties.
*/
static const char* PropertyIDLName(nsCSSPropertyID aProperty)
{
MOZ_ASSERT(0 <= aProperty && aProperty < eCSSProperty_COUNT,
"out of range");
return kIDLNameTable[aProperty];
}
private:
static const int32_t kIDLNameSortPositionTable[eCSSProperty_COUNT];
public:
/**
* Returns the position of the specified property in a list of all
* properties sorted by their IDL name.
*/
static int32_t PropertyIDLNameSortPosition(nsCSSPropertyID aProperty)
{
MOZ_ASSERT(0 <= aProperty && aProperty < eCSSProperty_COUNT,
"out of range");
return kIDLNameSortPositionTable[aProperty];
}
static bool IsEnabled(nsCSSPropertyID aProperty) {
MOZ_ASSERT(0 <= aProperty && aProperty < eCSSProperty_COUNT_with_aliases,
"out of range");
// In the child process, assert that we're not trying to parse stylesheets
// before we've gotten all our prefs.
MOZ_ASSERT_IF(!XRE_IsParentProcess(),
mozilla::Preferences::ArePrefsInitedInContentProcess());
return gPropertyEnabled[aProperty];
}
// A table for the use counter associated with each CSS property. If a
// property does not have a use counter defined in UseCounters.conf, then
// its associated entry is |eUseCounter_UNKNOWN|.
static const mozilla::UseCounter gPropertyUseCounter[eCSSProperty_COUNT_no_shorthands];
public:
static mozilla::UseCounter UseCounterFor(nsCSSPropertyID aProperty) {
MOZ_ASSERT(0 <= aProperty && aProperty < eCSSProperty_COUNT_no_shorthands,
"out of range");
return gPropertyUseCounter[aProperty];
}
static bool IsEnabled(nsCSSPropertyID aProperty, EnabledState aEnabled)
{
if (IsEnabled(aProperty)) {
return true;
}
if (aEnabled == EnabledState::eIgnoreEnabledState) {
return true;
}
if ((aEnabled & EnabledState::eInUASheets) &&
PropHasFlags(aProperty, Flags::EnabledInUASheets))
{
return true;
}
if ((aEnabled & EnabledState::eInChrome) &&
PropHasFlags(aProperty, Flags::EnabledInChrome))
{
return true;
}
return false;
}
public:
// Storing the enabledstate_ value in an nsCSSPropertyID variable is a small hack
// to avoid needing a separate variable declaration for its real type
// (CSSEnabledState), which would then require using a block and
// therefore a pair of macros by consumers for the start and end of the loop.
#define CSSPROPS_FOR_SHORTHAND_SUBPROPERTIES(it_, prop_, enabledstate_) \
for (const nsCSSPropertyID *it_ = nsCSSProps::SubpropertyEntryFor(prop_), \
es_ = (nsCSSPropertyID)((enabledstate_) | \
CSSEnabledState(0)); \
*it_ != eCSSProperty_UNKNOWN; ++it_) \
if (nsCSSProps::IsEnabled(*it_, (mozilla::CSSEnabledState) es_))
// Keyword/Enum value tables
static const KTableEntry kAnimationDirectionKTable[];
static const KTableEntry kAnimationFillModeKTable[];
static const KTableEntry kAnimationPlayStateKTable[];
static const KTableEntry kAppearanceKTable[];
static const KTableEntry kBackfaceVisibilityKTable[];
static const KTableEntry kTransformStyleKTable[];
static const KTableEntry kImageLayerAttachmentKTable[];
static const KTableEntry kBackgroundOriginKTable[];
static const KTableEntry kMaskOriginKTable[];
static const KTableEntry kImageLayerRepeatKTable[];
static const KTableEntry kImageLayerCompositeKTable[];
static const KTableEntry kImageLayerModeKTable[];
// Not const because we modify its entries when the pref
// "layout.css.background-clip.text" changes:
static KTableEntry kBackgroundClipKTable[];
static const KTableEntry kMaskClipKTable[];
static const KTableEntry kBlendModeKTable[];
static const KTableEntry kBorderCollapseKTable[];
static const KTableEntry kBorderImageRepeatKTable[];
static const KTableEntry kBorderStyleKTable[];
static const KTableEntry kBoxAlignKTable[];
static const KTableEntry kBoxDecorationBreakKTable[];
static const KTableEntry kBoxDirectionKTable[];
static const KTableEntry kBoxOrientKTable[];
static const KTableEntry kBoxPackKTable[];
static const KTableEntry kClipPathGeometryBoxKTable[];
static const KTableEntry kCounterSystemKTable[];
static const KTableEntry kDominantBaselineKTable[];
static const KTableEntry kShapeRadiusKTable[];
static const KTableEntry kFillRuleKTable[];
static const KTableEntry kFilterFunctionKTable[];
static const KTableEntry kImageRenderingKTable[];
static const KTableEntry kShapeOutsideShapeBoxKTable[];
static const KTableEntry kShapeRenderingKTable[];
static const KTableEntry kStrokeLinecapKTable[];
static const KTableEntry kStrokeLinejoinKTable[];
static const KTableEntry kVectorEffectKTable[];
static const KTableEntry kTextAnchorKTable[];
static const KTableEntry kTextRenderingKTable[];
static const KTableEntry kColorAdjustKTable[];
static const KTableEntry kColorInterpolationKTable[];
static const KTableEntry kColumnFillKTable[];
static const KTableEntry kColumnSpanKTable[];
static const KTableEntry kBoxShadowTypeKTable[];
static const KTableEntry kBoxSizingKTable[];
static const KTableEntry kCaptionSideKTable[];
static const KTableEntry kClearKTable[];
static const KTableEntry kCursorKTable[];
static const KTableEntry kDirectionKTable[];
// Not const because we modify its entries when various
// "layout.css.*.enabled" prefs changes:
static KTableEntry kDisplayKTable[];
static const KTableEntry kEmptyCellsKTable[];
// -- tables for parsing the {align,justify}-{content,items,self} properties --
static const KTableEntry kAlignAllKeywords[];
static const KTableEntry kAlignOverflowPosition[]; // <overflow-position>
static const KTableEntry kAlignSelfPosition[]; // <self-position>
static const KTableEntry kAlignLegacy[]; // 'legacy'
static const KTableEntry kAlignLegacyPosition[]; // 'left/right/center'
static const KTableEntry kAlignAutoNormalStretchBaseline[]; // 'auto/normal/stretch/baseline'
static const KTableEntry kAlignNormalStretchBaseline[]; // 'normal/stretch/baseline'
static const KTableEntry kAlignNormalBaseline[]; // 'normal/baseline'
static const KTableEntry kAlignContentDistribution[]; // <content-distribution>
static const KTableEntry kAlignContentPosition[]; // <content-position>
// -- tables for auto-completion of the {align,justify}-{content,items,self} properties --
static const KTableEntry kAutoCompletionAlignJustifySelf[];
static const KTableEntry kAutoCompletionAlignItems[];
static const KTableEntry kAutoCompletionAlignJustifyContent[];
// ------------------------------------------------------------------
static const KTableEntry kFlexDirectionKTable[];
static const KTableEntry kFlexWrapKTable[];
static const KTableEntry kFloatKTable[];
static const KTableEntry kFloatEdgeKTable[];
static const KTableEntry kFontKerningKTable[];
static const KTableEntry kFontOpticalSizingKTable[];
static const KTableEntry kFontSmoothingKTable[];
static const KTableEntry kFontSynthesisKTable[];
static const KTableEntry kFontVariantAlternatesKTable[];
static const KTableEntry kFontVariantAlternatesFuncsKTable[];
static const KTableEntry kFontVariantCapsKTable[];
static const KTableEntry kFontVariantEastAsianKTable[];
static const KTableEntry kFontVariantLigaturesKTable[];
static const KTableEntry kFontVariantNumericKTable[];
static const KTableEntry kFontVariantPositionKTable[];
static const KTableEntry kGridAutoFlowKTable[];
static const KTableEntry kGridTrackBreadthKTable[];
static const KTableEntry kHyphensKTable[];
static const KTableEntry kIsolationKTable[];
static const KTableEntry kIMEModeKTable[];
static const KTableEntry kLineHeightKTable[];
static const KTableEntry kListStylePositionKTable[];
static const KTableEntry kMaskTypeKTable[];
static const KTableEntry kContainKTable[];
static const KTableEntry kObjectFitKTable[];
static const KTableEntry kOrientKTable[];
static const KTableEntry kOutlineStyleKTable[];
static const KTableEntry kOverflowKTable[];
static const KTableEntry kOverflowSubKTable[];
static const KTableEntry kOverflowClipBoxKTable[];
static const KTableEntry kOverflowWrapKTable[];
static const KTableEntry kPageBreakInsideKTable[];
static const KTableEntry kPointerEventsKTable[];
static const KTableEntry kPositionKTable[];
static const KTableEntry kRadialGradientSizeKTable[];
static const KTableEntry kResizeKTable[];
static const KTableEntry kRubyAlignKTable[];
static const KTableEntry kRubyPositionKTable[];
static const KTableEntry kScrollBehaviorKTable[];
static const KTableEntry kOverscrollBehaviorKTable[];
static const KTableEntry kScrollSnapTypeKTable[];
static const KTableEntry kStackSizingKTable[];
static const KTableEntry kTableLayoutKTable[];
// Not const because we modify its entries when the pref
// "layout.css.text-align-unsafe-value.enabled" changes:
static KTableEntry kTextAlignKTable[];
static KTableEntry kTextAlignLastKTable[];
static const KTableEntry kTextCombineUprightKTable[];
static const KTableEntry kTextDecorationLineKTable[];
static const KTableEntry kTextDecorationStyleKTable[];
static const KTableEntry kTextEmphasisStyleShapeKTable[];
static const KTableEntry kTextJustifyKTable[];
static const KTableEntry kTextOrientationKTable[];
static const KTableEntry kTextOverflowKTable[];
static const KTableEntry kTextSizeAdjustKTable[];
static const KTableEntry kTextTransformKTable[];
static const KTableEntry kTouchActionKTable[];
static const KTableEntry kTransformBoxKTable[];
static const KTableEntry kTransitionTimingFunctionKTable[];
static const KTableEntry kUnicodeBidiKTable[];
static const KTableEntry kUserFocusKTable[];
static const KTableEntry kUserInputKTable[];
static const KTableEntry kUserModifyKTable[];
static const KTableEntry kUserSelectKTable[];
static const KTableEntry kVerticalAlignKTable[];
static const KTableEntry kVisibilityKTable[];
static const KTableEntry kWhitespaceKTable[];
static const KTableEntry kWidthKTable[]; // also min-width, max-width
static const KTableEntry kFlexBasisKTable[];
static const KTableEntry kWindowDraggingKTable[];
static const KTableEntry kWindowShadowKTable[];
static const KTableEntry kWordBreakKTable[];
static const KTableEntry kWritingModeKTable[];
};
#endif /* nsCSSProps_h___ */
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