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layout/style/nsCSSPseudoElements.cpp@97036ab72558 (annotated)

layout/style/nsCSSPseudoElements.cpp

Tue, 06 Jan 2015 21:39:09 +0100

author

Michael Schloh von Bennewitz <michael@schloh.com>

date

Tue, 06 Jan 2015 21:39:09 +0100

branch

TOR_BUG_9701

changeset 8

97036ab72558

permissions

-rw-r--r--

Conditionally force memory storage according to privacy.thirdparty.isolate;
This solves Tor bug #9701, complying with disk avoidance documented in
https://www.torproject.org/projects/torbrowser/design/#disk-avoidance.

michael@0	1	/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
michael@0	2	/* This Source Code Form is subject to the terms of the Mozilla Public
michael@0	3	* License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0	4	* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0	5
michael@0	6	/* atom list for CSS pseudo-elements */
michael@0	7
michael@0	8	#include "mozilla/ArrayUtils.h"
michael@0	9
michael@0	10	#include "nsCSSPseudoElements.h"
michael@0	11	#include "nsAtomListUtils.h"
michael@0	12	#include "nsStaticAtom.h"
michael@0	13	#include "nsCSSAnonBoxes.h"
michael@0	14
michael@0	15	using namespace mozilla;
michael@0	16
michael@0	17	// define storage for all atoms
michael@0	18	#define CSS_PSEUDO_ELEMENT(name_, value_, flags_) \
michael@0	19	nsICSSPseudoElement* nsCSSPseudoElements::name_;
michael@0	20	#include "nsCSSPseudoElementList.h"
michael@0	21	#undef CSS_PSEUDO_ELEMENT
michael@0	22
michael@0	23	#define CSS_PSEUDO_ELEMENT(name_, value_, flags_) \
michael@0	24	NS_STATIC_ATOM_BUFFER(name_##_pseudo_element_buffer, value_)
michael@0	25	#include "nsCSSPseudoElementList.h"
michael@0	26	#undef CSS_PSEUDO_ELEMENT
michael@0	27
michael@0	28	static const nsStaticAtom CSSPseudoElements_info[] = {
michael@0	29	#define CSS_PSEUDO_ELEMENT(name_, value_, flags_) \
michael@0	30	NS_STATIC_ATOM(name_##_pseudo_element_buffer, (nsIAtom**)&nsCSSPseudoElements::name_),
michael@0	31	#include "nsCSSPseudoElementList.h"
michael@0	32	#undef CSS_PSEUDO_ELEMENT
michael@0	33	};
michael@0	34
michael@0	35	// Separate from the array above so that we can have an array of
michael@0	36	// nsStaticAtom (to pass to NS_RegisterStaticAtoms and
michael@0	37	// nsAtomListUtils::IsMember), but with corresponding indices (so the
michael@0	38	// i-th element of this array is the flags for the i-th pseudo-element
michael@0	39	// in the previous array).
michael@0	40	static const uint32_t CSSPseudoElements_flags[] = {
michael@0	41	#define CSS_PSEUDO_ELEMENT(name_, value_, flags_) \
michael@0	42	flags_,
michael@0	43	#include "nsCSSPseudoElementList.h"
michael@0	44	#undef CSS_PSEUDO_ELEMENT
michael@0	45	};
michael@0	46
michael@0	47	void nsCSSPseudoElements::AddRefAtoms()
michael@0	48	{
michael@0	49	NS_RegisterStaticAtoms(CSSPseudoElements_info);
michael@0	50	}
michael@0	51
michael@0	52	bool nsCSSPseudoElements::IsPseudoElement(nsIAtom *aAtom)
michael@0	53	{
michael@0	54	return nsAtomListUtils::IsMember(aAtom, CSSPseudoElements_info,
michael@0	55	ArrayLength(CSSPseudoElements_info));
michael@0	56	}
michael@0	57
michael@0	58	/* static */ bool
michael@0	59	nsCSSPseudoElements::IsCSS2PseudoElement(nsIAtom *aAtom)
michael@0	60	{
michael@0	61	// We don't implement this using PseudoElementHasFlags because callers
michael@0	62	// want to pass things that could be anon boxes.
michael@0	63	NS_ASSERTION(nsCSSPseudoElements::IsPseudoElement(aAtom) ||
michael@0	64	nsCSSAnonBoxes::IsAnonBox(aAtom),
michael@0	65	"must be pseudo element or anon box");
michael@0	66	bool result = aAtom == nsCSSPseudoElements::after ||
michael@0	67	aAtom == nsCSSPseudoElements::before ||
michael@0	68	aAtom == nsCSSPseudoElements::firstLetter ||
michael@0	69	aAtom == nsCSSPseudoElements::firstLine;
michael@0	70	NS_ASSERTION(nsCSSAnonBoxes::IsAnonBox(aAtom) ||
michael@0	71	result ==
michael@0	72	PseudoElementHasFlags(GetPseudoType(aAtom), CSS_PSEUDO_ELEMENT_IS_CSS2),
michael@0	73	"result doesn't match flags");
michael@0	74	return result;
michael@0	75	}
michael@0	76
michael@0	77	/* static */ nsCSSPseudoElements::Type
michael@0	78	nsCSSPseudoElements::GetPseudoType(nsIAtom *aAtom)
michael@0	79	{
michael@0	80	for (uint32_t i = 0; i < ArrayLength(CSSPseudoElements_info); ++i) {
michael@0	81	if (*CSSPseudoElements_info[i].mAtom == aAtom) {
michael@0	82	return Type(i);
michael@0	83	}
michael@0	84	}
michael@0	85
michael@0	86	if (nsCSSAnonBoxes::IsAnonBox(aAtom)) {
michael@0	87	#ifdef MOZ_XUL
michael@0	88	if (nsCSSAnonBoxes::IsTreePseudoElement(aAtom)) {
michael@0	89	return ePseudo_XULTree;
michael@0	90	}
michael@0	91	#endif
michael@0	92
michael@0	93	return ePseudo_AnonBox;
michael@0	94	}
michael@0	95
michael@0	96	return ePseudo_NotPseudoElement;
michael@0	97	}
michael@0	98
michael@0	99	/* static */ nsIAtom*
michael@0	100	nsCSSPseudoElements::GetPseudoAtom(Type aType)
michael@0	101	{
michael@0	102	NS_ASSERTION(aType < nsCSSPseudoElements::ePseudo_PseudoElementCount,
michael@0	103	"Unexpected type");
michael@0	104	return *CSSPseudoElements_info[aType].mAtom;
michael@0	105	}
michael@0	106
michael@0	107	/* static */ uint32_t
michael@0	108	nsCSSPseudoElements::FlagsForPseudoElement(const Type aType)
michael@0	109	{
michael@0	110	size_t index = static_cast<size_t>(aType);
michael@0	111	NS_ASSERTION(index < ArrayLength(CSSPseudoElements_flags),
michael@0	112	"argument must be a pseudo-element");
michael@0	113	return CSSPseudoElements_flags[index];
michael@0	114	}
michael@0	115
michael@0	116	/* static */ bool
michael@0	117	nsCSSPseudoElements::PseudoElementSupportsUserActionState(const Type aType)
michael@0	118	{
michael@0	119	return PseudoElementHasFlags(aType,
michael@0	120	CSS_PSEUDO_ELEMENT_SUPPORTS_USER_ACTION_STATE);
michael@0	121	}