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-rw-r--r--dom/base/nsContentUtils.cpp16
-rw-r--r--dom/base/nsContentUtils.h7
2 files changed, 23 insertions, 0 deletions
diff --git a/dom/base/nsContentUtils.cpp b/dom/base/nsContentUtils.cpp
index 34c7d23b8..8612e76df 100644
--- a/dom/base/nsContentUtils.cpp
+++ b/dom/base/nsContentUtils.cpp
@@ -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;
+} \ No newline at end of file
diff --git a/dom/base/nsContentUtils.h b/dom/base/nsContentUtils.h
index 9ae6d2155..c255f813a 100644
--- a/dom/base/nsContentUtils.h
+++ b/dom/base/nsContentUtils.h
@@ -2730,6 +2730,13 @@ public:
static bool AttemptLargeAllocationLoad(nsIHttpChannel* aChannel);
+ /**
+ * Detect whether a string is a (CSS) local-url.
+ * https://drafts.csswg.org/css-values/#local-urls
+ */
+ static bool
+ IsLocalRefURL(const nsString& aString);
+
private:
static bool InitializeEventTable();