зеркало из https://github.com/mozilla/gecko-dev.git
142 строки
4.8 KiB
C++
142 строки
4.8 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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#include "SVGElementFactory.h"
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#include "nsGkAtoms.h"
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#include "nsIContent.h"
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#include "mozilla/dom/NodeInfo.h"
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#include "mozilla/dom/Element.h"
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#include "mozilla/dom/FromParser.h"
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using namespace mozilla;
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using namespace mozilla::dom;
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// Hash table that maps nsIAtom* SVG tags to an offset index
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// within the array sSVGContentCreatorFunctions (offset by TABLE_VALUE_OFFSET)
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static PLHashTable* sTagAtomTable = nullptr;
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// We don't want to store 0 in the hash table as a return value of 0 from
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// PL_HashTableLookupConst indicates that the value is not found
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#define TABLE_VALUE_OFFSET 1
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#define SVG_TAG(_tag, _classname) \
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nsresult NS_NewSVG##_classname##Element( \
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nsIContent** aResult, \
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already_AddRefed<mozilla::dom::NodeInfo>&& aNodeInfo); \
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\
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nsresult NS_NewSVG##_classname##Element( \
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nsIContent** aResult, \
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already_AddRefed<mozilla::dom::NodeInfo>&& aNodeInfo, \
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FromParser aFromParser) \
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{ \
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return NS_NewSVG##_classname##Element(aResult, mozilla::Move(aNodeInfo)); \
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}
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#define SVG_FROM_PARSER_TAG(_tag, _classname)
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#include "SVGTagList.h"
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#undef SVG_TAG
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#undef SVG_FROM_PARSER_TAG
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nsresult
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NS_NewSVGElement(Element** aResult,
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already_AddRefed<mozilla::dom::NodeInfo>&& aNodeInfo);
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static const SVGContentCreatorFunction sSVGContentCreatorFunctions[] = {
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#define SVG_TAG(_tag, _classname) NS_NewSVG##_classname##Element,
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#define SVG_FROM_PARSER_TAG(_tag, _classname) NS_NewSVG##_classname##Element,
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#include "SVGTagList.h"
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#undef SVG_TAG
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#undef SVG_FROM_PARSER_TAG
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};
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enum SVGTag {
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#define SVG_TAG(_tag, _classname) eSVGTag_##_tag,
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#define SVG_FROM_PARSER_TAG(_tag, _classname) eSVGTag_##_tag,
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#include "SVGTagList.h"
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#undef SVG_TAG
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#undef SVG_FROM_PARSER_TAG
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eSVGTag_Count
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};
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// nsIAtom* -> id hash
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static PLHashNumber
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SVGTagsHashCodeAtom(const void* key)
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{
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return NS_PTR_TO_INT32(key) >> 2;
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}
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void
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SVGElementFactory::Init()
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{
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sTagAtomTable = PL_NewHashTable(64, SVGTagsHashCodeAtom,
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PL_CompareValues, PL_CompareValues,
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nullptr, nullptr);
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#define SVG_TAG(_tag, _classname) \
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PL_HashTableAdd(sTagAtomTable, nsGkAtoms::_tag,\
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NS_INT32_TO_PTR(eSVGTag_##_tag + TABLE_VALUE_OFFSET));
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#define SVG_FROM_PARSER_TAG(_tag, _classname) \
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PL_HashTableAdd(sTagAtomTable, nsGkAtoms::_tag,\
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NS_INT32_TO_PTR(eSVGTag_##_tag + TABLE_VALUE_OFFSET));
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#include "SVGTagList.h"
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#undef SVG_TAG
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#undef SVG_FROM_PARSER_TAG
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}
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void
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SVGElementFactory::Shutdown()
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{
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if (sTagAtomTable) {
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PL_HashTableDestroy(sTagAtomTable);
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sTagAtomTable = nullptr;
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}
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}
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nsresult
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NS_NewSVGElement(Element** aResult, already_AddRefed<mozilla::dom::NodeInfo>&& aNodeInfo,
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FromParser aFromParser)
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{
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NS_ASSERTION(sTagAtomTable, "no lookup table, needs SVGElementFactory::Init");
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RefPtr<mozilla::dom::NodeInfo> ni = aNodeInfo;
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nsIAtom* name = ni->NameAtom();
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NS_ASSERTION(ni->NamespaceEquals(kNameSpaceID_SVG),
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"Trying to create SVG elements that aren't in the SVG namespace");
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void* tag = PL_HashTableLookupConst(sTagAtomTable, name);
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if (tag) {
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int32_t index = NS_PTR_TO_INT32(tag) - TABLE_VALUE_OFFSET;
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if (index < 0 || index >= eSVGTag_Count) {
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NS_WARNING("About to index out of array bounds - crashing instead");
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MOZ_CRASH();
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}
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SVGContentCreatorFunction cb = sSVGContentCreatorFunctions[index];
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nsCOMPtr<nsIContent> content;
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nsresult rv = cb(getter_AddRefs(content), ni.forget(), aFromParser);
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*aResult = content.forget().take()->AsElement();
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return rv;
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}
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// if we don't know what to create, just create a standard svg element:
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return NS_NewSVGElement(aResult, ni.forget());
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}
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nsresult
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NS_NewSVGUnknownElement(nsIContent** aResult,
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already_AddRefed<mozilla::dom::NodeInfo>&& aNodeInfo,
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FromParser aFromParser)
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{
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RefPtr<mozilla::dom::NodeInfo> ni = aNodeInfo;
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nsCOMPtr<Element> element;
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nsresult rv = NS_NewSVGElement(getter_AddRefs(element), ni.forget());
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element.forget(aResult);
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return rv;
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}
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