Bug 1862999 - Introduce support for AXARIAPosInSet and AXARIASetSize. r=morgan

Differential Revision: https://phabricator.services.mozilla.com/D192887

accessible/mac/MOXAccessibleProtocol.h

@@ -261,6 +261,12 @@
 // AXSelectedRows
 - (NSArray* _Nullable)moxSelectedRows;
 
+// AXARIAPosInSet
+- (NSNumber* _Nullable)moxARIAPosInSet;
+
+// AXARIASetSize
+- (NSNumber* _Nullable)moxARIASetSize;
+
 // Math Attributes
 
 // AXMathRootRadicand

accessible/mac/mozAccessible.h

@@ -206,6 +206,12 @@ enum CheckedState {
 // override
 - (NSString*)moxARIALive;
 
+// override
+- (NSNumber*)moxARIAPosInSet;
+
+// override
+- (NSNumber*)moxARIASetSize;
+
 // override
 - (NSString*)moxARIARelevant;
 

accessible/mac/mozAccessible.mm

@@ -159,6 +159,12 @@ using namespace mozilla::a11y;
     return ![self moxIsLiveRegion];
   }
 
+  if (selector == @selector(moxARIAPosInSet) || selector == @selector
+                                                    (moxARIASetSize)) {
+    GroupPos groupPos = mGeckoAccessible->GroupPosition();
+    return groupPos.setSize == 0;
+  }
+
   if (selector == @selector(moxExpanded)) {
     return [self stateWithMask:states::EXPANDABLE] == 0;
   }
@@ -620,6 +626,16 @@ struct RoleDescrComparator {
   return utils::GetAccAttr(self, nsGkAtoms::aria_live);
 }
 
+- (NSNumber*)moxARIAPosInSet {
+  GroupPos groupPos = mGeckoAccessible->GroupPosition();
+  return @(groupPos.posInSet);
+}
+
+- (NSNumber*)moxARIASetSize {
+  GroupPos groupPos = mGeckoAccessible->GroupPosition();
+  return @(groupPos.setSize);
+}
+
 - (NSString*)moxARIARelevant {
   if (NSString* relevant =
           utils::GetAccAttr(self, nsGkAtoms::containerRelevant)) {

accessible/tests/browser/mac/browser.toml

@@ -29,6 +29,8 @@ https_first_disabled = true
 
 ["browser_aria_haspopup.js"]
 
+["browser_aria_setsize.js"]
+
 ["browser_attributed_text.js"]
 
 ["browser_bounds.js"]

accessible/tests/browser/mac/browser_aria_setsize.js

@@ -0,0 +1,47 @@
+/* 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/. */
+
+"use strict";
+
+/**
+ * Test aria-setsize and aria-posinset
+ */
+addAccessibleTask(
+  `<div role="listbox" id="select" aria-label="Choose a number">
+     <div role="option" id="two" aria-setsize="5" aria-posinset="2">Two</div>
+     <div role="option" id="three" aria-setsize="5" aria-posinset="3">Three</div>
+     <div role="option" id="four" aria-setsize="5" aria-posinset="4">Four</div>
+   </div>
+   <p id="p">Hello</p>`,
+  async (browser, accDoc) => {
+    function testPosInSet(id, setsize, posinset) {
+      let elem = getNativeInterface(accDoc, id);
+      is(
+        elem.getAttributeValue("AXARIASetSize"),
+        setsize,
+        `${id}: Correct set size`
+      );
+
+      is(
+        elem.getAttributeValue("AXARIAPosInSet"),
+        posinset,
+        `${id}: Correct position in set`
+      );
+    }
+
+    testPosInSet("two", 5, 2);
+    testPosInSet("three", 5, 3);
+    testPosInSet("four", 5, 4);
+
+    let p = getNativeInterface(accDoc, "p");
+    ok(
+      !p.attributeNames.includes("AXARIASetSize"),
+      "Paragraph should not have AXARIASetSize"
+    );
+    ok(
+      !p.attributeNames.includes("AXARIAPosInSet"),
+      "Paragraph should not have AXARIAPosInSet"
+    );
+  }
+);