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Bug 1357432 (#750)

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* Part 1. Move IsLocalRefURL to nsContentUtils to reuse this function. (port-rewrite)

`IsLocalRefURL` is originally designed to be used by URLValue only.
Since we need this function in SVGUseElement::LookupHref too, move it to nsContentUtils as a util function.

* Revert "Part 1. Move IsLocalRefURL to nsContentUtils to reuse this function. (port-rewrite)"

This reverts commit 19f010c62022e269f99066a8d90e3522fe31adaf.

* Part 1. Duplicate IsLocalRefURL to nsContentUtils to reuse this function.

`IsLocalRefURL` is originally designed to be used by URLValue only.
Since we need this function in SVGUseElement::LookupHref too, duplicate it to nsContentUtils as a util function.
This is a duplication because CSSValue uses stringbuffers and not nsStrings.
While Bug 1356060 - "Just use nsString in URLValueData" converts this use from stringbuffer to nsString, it builds on a bunch of vartype refactoring (nsString vs. nsAString, etc.) which is too much of a headache to deal with just to deduplicate this simple function.

* Part 2. Implement nsSVGEffects::GetBaseURLForLocalRef to export local-ref-url-resolving logic.

ResolveURLUsingLocalRef is designed to be internally used by nsSVGEffects::Get-{SVGEffect}-URI functions.
Since we also need it in SVGUseElement::LookupHref, make it public in nsSVGEffects.

* Part 3. Resolve local-ref in SVGUseElement::LookupHref by nsSVGEffects::GetBaseURLForLocalRef.

* Part 4. Reftest for using local-ref as xlink:href value.
This commit is contained in:
Moonchild 2018-09-05 03:20:16 +02:00 • committed by Roy Tam
commit 49fc92f4a1
7 changed files with 90 additions and 19 deletions
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16
dom/base/nsContentUtils.cpp
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@ -9787,3 +9787,19 @@ nsContentUtils::AttemptLargeAllocationLoad(nsIHttpChannel* aChannel)
return reloadSucceeded;
}
/* static */ bool
nsContentUtils::IsLocalRefURL(const nsString& aString)
{
// Find the first non-"C0 controls + space" character.
const char16_t* current = aString.get();
for (; *current != '\0'; current++) {
if (*current > 0x20) {
// if the first non-"C0 controls + space" character is '#', this is a
// local-ref URL.
return *current == '#';
}
}
return false;
}