diff options
Diffstat (limited to 'dom/svg/SVGFragmentIdentifier.cpp')
| -rw-r--r-- | dom/svg/SVGFragmentIdentifier.cpp | 182 |
1 files changed, 182 insertions, 0 deletions
diff --git a/dom/svg/SVGFragmentIdentifier.cpp b/dom/svg/SVGFragmentIdentifier.cpp new file mode 100644 index 0000000000..0932afd8ca --- /dev/null +++ b/dom/svg/SVGFragmentIdentifier.cpp @@ -0,0 +1,182 @@ +/* -*- 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/. */ + +#include "SVGFragmentIdentifier.h" + +#include "mozilla/dom/SVGSVGElement.h" +#include "mozilla/dom/SVGViewElement.h" +#include "mozilla/SVGOuterSVGFrame.h" +#include "nsCharSeparatedTokenizer.h" +#include "SVGAnimatedTransformList.h" + +namespace mozilla { + +using namespace dom; + +static bool IsMatchingParameter(const nsAString& aString, + const nsAString& aParameterName) { + // The first two tests ensure aString.Length() > aParameterName.Length() + // so it's then safe to do the third test + return StringBeginsWith(aString, aParameterName) && aString.Last() == ')' && + aString.CharAt(aParameterName.Length()) == '('; +} + +// Handles setting/clearing the root's mSVGView pointer. +class MOZ_RAII AutoSVGViewHandler { + public: + explicit AutoSVGViewHandler(SVGSVGElement* aRoot) + : mRoot(aRoot), mValid(false) { + mWasOverridden = mRoot->UseCurrentView(); + mRoot->mSVGView = nullptr; + mRoot->mCurrentViewID = nullptr; + } + + ~AutoSVGViewHandler() { + if (!mWasOverridden && !mValid) { + // we weren't overridden before and we aren't + // overridden now so nothing has changed. + return; + } + if (mValid) { + mRoot->mSVGView = std::move(mSVGView); + } + mRoot->InvalidateTransformNotifyFrame(); + if (nsIFrame* f = mRoot->GetPrimaryFrame()) { + if (SVGOuterSVGFrame* osf = do_QueryFrame(f)) { + osf->MaybeSendIntrinsicSizeAndRatioToEmbedder(); + } + } + } + + void CreateSVGView() { + MOZ_ASSERT(!mSVGView, "CreateSVGView should not be called multiple times"); + mSVGView = MakeUnique<SVGView>(); + } + + bool ProcessAttr(const nsAString& aToken, const nsAString& aParams) { + MOZ_ASSERT(mSVGView, "CreateSVGView should have been called"); + + // SVGViewAttributes may occur in any order, but each type may only occur + // at most one time in a correctly formed SVGViewSpec. + // If we encounter any attribute more than once or get any syntax errors + // we're going to return false and cancel any changes. + + if (IsMatchingParameter(aToken, u"viewBox"_ns)) { + if (mSVGView->mViewBox.IsExplicitlySet() || + NS_FAILED( + mSVGView->mViewBox.SetBaseValueString(aParams, mRoot, false))) { + return false; + } + } else if (IsMatchingParameter(aToken, u"preserveAspectRatio"_ns)) { + if (mSVGView->mPreserveAspectRatio.IsExplicitlySet() || + NS_FAILED(mSVGView->mPreserveAspectRatio.SetBaseValueString( + aParams, mRoot, false))) { + return false; + } + } else if (IsMatchingParameter(aToken, u"transform"_ns)) { + if (mSVGView->mTransforms) { + return false; + } + mSVGView->mTransforms = MakeUnique<SVGAnimatedTransformList>(); + if (NS_FAILED( + mSVGView->mTransforms->SetBaseValueString(aParams, mRoot))) { + return false; + } + } else if (IsMatchingParameter(aToken, u"zoomAndPan"_ns)) { + if (mSVGView->mZoomAndPan.IsExplicitlySet()) { + return false; + } + nsAtom* valAtom = NS_GetStaticAtom(aParams); + if (!valAtom || !mSVGView->mZoomAndPan.SetBaseValueAtom(valAtom, mRoot)) { + return false; + } + } else { + return false; + } + return true; + } + + void SetValid() { mValid = true; } + + private: + SVGSVGElement* mRoot; + UniquePtr<SVGView> mSVGView; + bool mValid; + bool mWasOverridden; +}; + +bool SVGFragmentIdentifier::ProcessSVGViewSpec(const nsAString& aViewSpec, + SVGSVGElement* aRoot) { + AutoSVGViewHandler viewHandler(aRoot); + + if (!IsMatchingParameter(aViewSpec, u"svgView"_ns)) { + return false; + } + + // Each token is a SVGViewAttribute + int32_t bracketPos = aViewSpec.FindChar('('); + uint32_t lengthOfViewSpec = aViewSpec.Length() - bracketPos - 2; + nsCharSeparatedTokenizerTemplate<NS_TokenizerIgnoreNothing> tokenizer( + Substring(aViewSpec, bracketPos + 1, lengthOfViewSpec), ';'); + + if (!tokenizer.hasMoreTokens()) { + return false; + } + viewHandler.CreateSVGView(); + + do { + nsAutoString token(tokenizer.nextToken()); + + bracketPos = token.FindChar('('); + if (bracketPos < 1 || token.Last() != ')') { + // invalid SVGViewAttribute syntax + return false; + } + + const nsAString& params = + Substring(token, bracketPos + 1, token.Length() - bracketPos - 2); + + if (!viewHandler.ProcessAttr(token, params)) { + return false; + } + + } while (tokenizer.hasMoreTokens()); + + viewHandler.SetValid(); + return true; +} + +bool SVGFragmentIdentifier::ProcessFragmentIdentifier( + Document* aDocument, const nsAString& aAnchorName) { + MOZ_ASSERT(aDocument->GetRootElement()->IsSVGElement(nsGkAtoms::svg), + "expecting an SVG root element"); + + auto* rootElement = SVGSVGElement::FromNode(aDocument->GetRootElement()); + + const auto* viewElement = + SVGViewElement::FromNodeOrNull(aDocument->GetElementById(aAnchorName)); + + if (viewElement) { + if (!rootElement->mCurrentViewID) { + rootElement->mCurrentViewID = MakeUnique<nsString>(); + } + *rootElement->mCurrentViewID = aAnchorName; + rootElement->mSVGView = nullptr; + rootElement->InvalidateTransformNotifyFrame(); + if (nsIFrame* f = rootElement->GetPrimaryFrame()) { + if (SVGOuterSVGFrame* osf = do_QueryFrame(f)) { + osf->MaybeSendIntrinsicSizeAndRatioToEmbedder(); + } + } + // not an svgView()-style fragment identifier, return false so the caller + // continues processing to match any :target pseudo elements + return false; + } + + return ProcessSVGViewSpec(aAnchorName, rootElement); +} + +} // namespace mozilla |