bool
SVGFragmentIdentifier::ProcessSVGViewSpec(const nsAString &aViewSpec,
nsSVGSVGElement *root)
{
if (!IsMatchingParameter(aViewSpec, NS_LITERAL_STRING("svgView"))) {
return false;
}
// 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.
bool viewBoxFound = false;
bool preserveAspectRatioFound = false;
bool transformFound = false;
bool zoomAndPanFound = false;
// Each token is a SVGViewAttribute
int32_t bracketPos = aViewSpec.FindChar('(');
uint32_t lengthOfViewSpec = aViewSpec.Length() - bracketPos - 2;
nsCharSeparatedTokenizerTemplate<IgnoreWhitespace> tokenizer(
Substring(aViewSpec, bracketPos + 1, lengthOfViewSpec), ';');
if (!tokenizer.hasMoreTokens()) {
return false;
}
do {
nsAutoString token(tokenizer.nextToken());
bracketPos = token.FindChar('(');
if (bracketPos < 1 || token.Last() != ')') {
// invalid SVGViewAttribute syntax
return false;
}
const nsAString ¶ms =
Substring(token, bracketPos + 1, token.Length() - bracketPos - 2);
if (IsMatchingParameter(token, NS_LITERAL_STRING("viewBox"))) {
if (viewBoxFound ||
NS_FAILED(root->mViewBox.SetBaseValueString(
params, root, true))) {
return false;
}
viewBoxFound = true;
} else if (IsMatchingParameter(token, NS_LITERAL_STRING("preserveAspectRatio"))) {
if (preserveAspectRatioFound ||
NS_FAILED(root->mPreserveAspectRatio.SetBaseValueString(
params, root, true))) {
return false;
}
preserveAspectRatioFound = true;
} else if (IsMatchingParameter(token, NS_LITERAL_STRING("transform"))) {
SVGAnimatedTransformList transforms;
if (transformFound ||
NS_FAILED(transforms.SetBaseValueString(params))) {
return false;
}
if (!root->mFragmentIdentifierTransform) {
root->mFragmentIdentifierTransform = new gfxMatrix();
}
*root->mFragmentIdentifierTransform =
transforms.GetBaseValue().GetConsolidationMatrix();
root->InvalidateTransformNotifyFrame();
transformFound = true;
} else if (IsMatchingParameter(token, NS_LITERAL_STRING("zoomAndPan"))) {
if (zoomAndPanFound) {
return false;
}
nsIAtom *valAtom = NS_GetStaticAtom(params);
if (!valAtom) {
return false;
}
const nsSVGEnumMapping *mapping = nsSVGSVGElement::sZoomAndPanMap;
while (mapping->mKey) {
if (valAtom == *(mapping->mKey)) {
// If we've got a valid zoomAndPan value, then set it on our root element.
if (NS_FAILED(root->mEnumAttributes[nsSVGSVGElement::ZOOMANDPAN].SetBaseValue(
mapping->mVal, root))) {
return false;
}
break;
}
mapping++;
}
if (!mapping->mKey) {
// Unrecognised zoomAndPan value
return false;
}
zoomAndPanFound = true;
} else {
// We don't support viewTarget currently
return false;
}
} while (tokenizer.hasMoreTokens());
if (root->mUseCurrentView) {
// A previous SVGViewSpec may have overridden some attributes.
// If they are no longer overridden we need to restore the old values.
if (!transformFound) {
ClearTransform(root);
}
if (!viewBoxFound) {
RestoreOldViewBox(root);
}
if (!preserveAspectRatioFound) {
RestoreOldPreserveAspectRatio(root);
}
if (!zoomAndPanFound) {
RestoreOldZoomAndPan(root);
}
}
return true;
}
