1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
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
|
