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+/* clang-format off */
+/* -*- Mode: Objective-C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* clang-format on */
+/* 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/. */
+
+#import "MOXAccessibleBase.h"
+
+#import "MacSelectorMap.h"
+
+#include "nsObjCExceptions.h"
+#include "xpcAccessibleMacInterface.h"
+#include "mozilla/Logging.h"
+#include "gfxPlatform.h"
+
+using namespace mozilla;
+using namespace mozilla::a11y;
+
+#undef LOG
+mozilla::LogModule* GetMacAccessibilityLog() {
+ static mozilla::LazyLogModule sLog("MacAccessibility");
+
+ return sLog;
+}
+#define LOG(type, format, ...) \
+ do { \
+ if (MOZ_LOG_TEST(GetMacAccessibilityLog(), type)) { \
+ NSString* msg = [NSString stringWithFormat:(format), ##__VA_ARGS__]; \
+ MOZ_LOG(GetMacAccessibilityLog(), type, ("%s", [msg UTF8String])); \
+ } \
+ } while (0)
+
+@interface NSObject (MOXAccessible)
+
+// This NSObject conforms to MOXAccessible.
+// This is needed to we know to mutate the value
+// (get represented view, check isAccessibilityElement)
+// before forwarding it to NSAccessibility.
+- (BOOL)isMOXAccessible;
+
+// Same as above, but this checks if the NSObject is an array with
+// mozAccessible conforming objects.
+- (BOOL)hasMOXAccessibles;
+
+@end
+
+@implementation NSObject (MOXAccessible)
+
+- (BOOL)isMOXAccessible {
+ return [self conformsToProtocol:@protocol(MOXAccessible)];
+}
+
+- (BOOL)hasMOXAccessibles {
+ return [self isKindOfClass:[NSArray class]] &&
+ [[(NSArray*)self firstObject] isMOXAccessible];
+}
+
+@end
+
+// Private methods
+@interface MOXAccessibleBase ()
+
+- (BOOL)isSelectorSupported:(SEL)selector;
+
+@end
+
+@implementation MOXAccessibleBase
+
+#pragma mark - mozAccessible/widget
+
+- (BOOL)hasRepresentedView {
+ return NO;
+}
+
+- (id)representedView {
+ return nil;
+}
+
+- (BOOL)isRoot {
+ return NO;
+}
+
+#pragma mark - mozAccessible/NSAccessibility
+
+- (NSArray*)accessibilityAttributeNames {
+ NS_OBJC_BEGIN_TRY_BLOCK_RETURN;
+
+ if ([self isExpired]) {
+ return nil;
+ }
+
+ static NSMutableDictionary* attributesForEachClass = nil;
+
+ if (!attributesForEachClass) {
+ attributesForEachClass = [[NSMutableDictionary alloc] init];
+ }
+
+ NSMutableArray* attributes =
+ attributesForEachClass [[self class]]
+ ?: [[[NSMutableArray alloc] init] autorelease];
+
+ NSDictionary* getters = mac::AttributeGetters();
+ if (![attributes count]) {
+ // Go through all our attribute getters, if they are supported by this class
+ // advertise the attribute name.
+ for (NSString* attribute in getters) {
+ SEL selector = NSSelectorFromString(getters[attribute]);
+ if ([self isSelectorSupported:selector]) {
+ [attributes addObject:attribute];
+ }
+ }
+
+ // If we have a delegate add all the text marker attributes.
+ if ([self moxTextMarkerDelegate]) {
+ [attributes addObjectsFromArray:[mac::TextAttributeGetters() allKeys]];
+ }
+
+ // We store a hash table with types as keys, and atttribute lists as values.
+ // This lets us cache the atttribute list of each subclass so we only
+ // need to gather its MOXAccessible methods once.
+ // XXX: Uncomment when accessibilityAttributeNames is removed from all
+ // subclasses. attributesForEachClass[[self class]] = attributes;
+ }
+
+ return attributes;
+
+ NS_OBJC_END_TRY_BLOCK_RETURN(nil);
+}
+
+- (id)accessibilityAttributeValue:(NSString*)attribute {
+ NS_OBJC_BEGIN_TRY_BLOCK_RETURN;
+ if ([self isExpired]) {
+ return nil;
+ }
+
+ id value = nil;
+ NSDictionary* getters = mac::AttributeGetters();
+ if (getters[attribute]) {
+ SEL selector = NSSelectorFromString(getters[attribute]);
+ if ([self isSelectorSupported:selector]) {
+ value = [self performSelector:selector];
+ }
+ } else if (id textMarkerDelegate = [self moxTextMarkerDelegate]) {
+ // If we have a delegate, check if attribute is a text marker
+ // attribute and call the associated selector on the delegate
+ // if so.
+ NSDictionary* textMarkerGetters = mac::TextAttributeGetters();
+ if (textMarkerGetters[attribute]) {
+ SEL selector = NSSelectorFromString(textMarkerGetters[attribute]);
+ if ([textMarkerDelegate respondsToSelector:selector]) {
+ value = [textMarkerDelegate performSelector:selector];
+ }
+ }
+ }
+
+ if ([value isMOXAccessible]) {
+ // If this is a MOXAccessible, get its represented view or filter it if
+ // it should be ignored.
+ value = [value isAccessibilityElement] ? GetObjectOrRepresentedView(value)
+ : nil;
+ }
+
+ if ([value hasMOXAccessibles]) {
+ // If this is an array of mozAccessibles, get each element's represented
+ // view and remove it from the returned array if it should be ignored.
+ NSUInteger arrSize = [value count];
+ NSMutableArray* arr =
+ [[[NSMutableArray alloc] initWithCapacity:arrSize] autorelease];
+ for (NSUInteger i = 0; i < arrSize; i++) {
+ id<mozAccessible> mozAcc = GetObjectOrRepresentedView(value[i]);
+ if ([mozAcc isAccessibilityElement]) {
+ [arr addObject:mozAcc];
+ }
+ }
+
+ value = arr;
+ }
+
+ if (MOZ_LOG_TEST(GetMacAccessibilityLog(), LogLevel::Debug)) {
+ if (MOZ_LOG_TEST(GetMacAccessibilityLog(), LogLevel::Verbose)) {
+ LOG(LogLevel::Verbose, @"%@ attributeValue %@ => %@", self, attribute,
+ value);
+ } else if (![attribute isEqualToString:@"AXParent"] &&
+ ![attribute isEqualToString:@"AXRole"] &&
+ ![attribute isEqualToString:@"AXSubrole"] &&
+ ![attribute isEqualToString:@"AXSize"] &&
+ ![attribute isEqualToString:@"AXPosition"] &&
+ ![attribute isEqualToString:@"AXRole"] &&
+ ![attribute isEqualToString:@"AXChildren"]) {
+ LOG(LogLevel::Debug, @"%@ attributeValue %@", self, attribute);
+ }
+ }
+
+ return value;
+
+ NS_OBJC_END_TRY_BLOCK_RETURN(nil);
+}
+
+- (BOOL)accessibilityIsAttributeSettable:(NSString*)attribute {
+ NS_OBJC_BEGIN_TRY_BLOCK_RETURN;
+
+ if ([self isExpired]) {
+ return NO;
+ }
+
+ NSDictionary* setters = mac::AttributeSetters();
+ if (setters[attribute]) {
+ SEL selector = NSSelectorFromString(setters[attribute]);
+ if ([self isSelectorSupported:selector]) {
+ return YES;
+ }
+ } else if (id textMarkerDelegate = [self moxTextMarkerDelegate]) {
+ // If we have a delegate, check text setters on delegate
+ NSDictionary* textMarkerSetters = mac::TextAttributeSetters();
+ if (textMarkerSetters[attribute]) {
+ SEL selector = NSSelectorFromString(textMarkerSetters[attribute]);
+ if ([textMarkerDelegate respondsToSelector:selector]) {
+ return YES;
+ }
+ }
+ }
+
+ NS_OBJC_END_TRY_BLOCK_RETURN(NO);
+}
+
+- (void)accessibilitySetValue:(id)value forAttribute:(NSString*)attribute {
+ NS_OBJC_BEGIN_TRY_IGNORE_BLOCK;
+
+ if ([self isExpired]) {
+ return;
+ }
+
+ LOG(LogLevel::Debug, @"%@ setValueForattribute %@ = %@", self, attribute,
+ value);
+
+ NSDictionary* setters = mac::AttributeSetters();
+ if (setters[attribute]) {
+ SEL selector = NSSelectorFromString(setters[attribute]);
+ if ([self isSelectorSupported:selector]) {
+ [self performSelector:selector withObject:value];
+ }
+ } else if (id textMarkerDelegate = [self moxTextMarkerDelegate]) {
+ // If we have a delegate, check if attribute is a text marker
+ // attribute and call the associated selector on the delegate
+ // if so.
+ NSDictionary* textMarkerSetters = mac::TextAttributeSetters();
+ if (textMarkerSetters[attribute]) {
+ SEL selector = NSSelectorFromString(textMarkerSetters[attribute]);
+ if ([textMarkerDelegate respondsToSelector:selector]) {
+ [textMarkerDelegate performSelector:selector withObject:value];
+ }
+ }
+ }
+
+ NS_OBJC_END_TRY_IGNORE_BLOCK;
+}
+
+- (NSArray*)accessibilityActionNames {
+ NS_OBJC_BEGIN_TRY_BLOCK_RETURN;
+
+ if ([self isExpired]) {
+ return nil;
+ }
+
+ NSMutableArray* actionNames = [[[NSMutableArray alloc] init] autorelease];
+
+ NSDictionary* actions = mac::Actions();
+ for (NSString* action in actions) {
+ SEL selector = NSSelectorFromString(actions[action]);
+ if ([self isSelectorSupported:selector]) {
+ [actionNames addObject:action];
+ }
+ }
+
+ return actionNames;
+
+ NS_OBJC_END_TRY_BLOCK_RETURN(nil);
+}
+
+- (void)accessibilityPerformAction:(NSString*)action {
+ NS_OBJC_BEGIN_TRY_IGNORE_BLOCK;
+
+ if ([self isExpired]) {
+ return;
+ }
+
+ LOG(LogLevel::Debug, @"%@ performAction %@ ", self, action);
+
+ NSDictionary* actions = mac::Actions();
+ if (actions[action]) {
+ SEL selector = NSSelectorFromString(actions[action]);
+ if ([self isSelectorSupported:selector]) {
+ [self performSelector:selector];
+ }
+ }
+
+ NS_OBJC_END_TRY_IGNORE_BLOCK;
+}
+
+- (NSString*)accessibilityActionDescription:(NSString*)action {
+ NS_OBJC_BEGIN_TRY_BLOCK_RETURN;
+ // by default we return whatever the MacOS API know about.
+ // if you have custom actions, override.
+ return NSAccessibilityActionDescription(action);
+ NS_OBJC_END_TRY_BLOCK_RETURN(nil);
+}
+
+- (NSArray*)accessibilityParameterizedAttributeNames {
+ NS_OBJC_BEGIN_TRY_BLOCK_RETURN;
+
+ if ([self isExpired]) {
+ return nil;
+ }
+
+ NSMutableArray* attributeNames = [[[NSMutableArray alloc] init] autorelease];
+
+ NSDictionary* attributes = mac::ParameterizedAttributeGetters();
+ for (NSString* attribute in attributes) {
+ SEL selector = NSSelectorFromString(attributes[attribute]);
+ if ([self isSelectorSupported:selector]) {
+ [attributeNames addObject:attribute];
+ }
+ }
+
+ // If we have a delegate add all the text marker attributes.
+ if ([self moxTextMarkerDelegate]) {
+ [attributeNames
+ addObjectsFromArray:[mac::ParameterizedTextAttributeGetters() allKeys]];
+ }
+
+ return attributeNames;
+
+ NS_OBJC_END_TRY_BLOCK_RETURN(nil);
+}
+
+- (id)accessibilityAttributeValue:(NSString*)attribute
+ forParameter:(id)parameter {
+ NS_OBJC_BEGIN_TRY_BLOCK_RETURN;
+
+ if ([self isExpired]) {
+ return nil;
+ }
+
+ id value = nil;
+
+ NSDictionary* getters = mac::ParameterizedAttributeGetters();
+ if (getters[attribute]) {
+ SEL selector = NSSelectorFromString(getters[attribute]);
+ if ([self isSelectorSupported:selector]) {
+ value = [self performSelector:selector withObject:parameter];
+ }
+ } else if (id textMarkerDelegate = [self moxTextMarkerDelegate]) {
+ // If we have a delegate, check if attribute is a text marker
+ // attribute and call the associated selector on the delegate
+ // if so.
+ NSDictionary* textMarkerGetters = mac::ParameterizedTextAttributeGetters();
+ if (textMarkerGetters[attribute]) {
+ SEL selector = NSSelectorFromString(textMarkerGetters[attribute]);
+ if ([textMarkerDelegate respondsToSelector:selector]) {
+ value = [textMarkerDelegate performSelector:selector
+ withObject:parameter];
+ }
+ }
+ }
+
+ if (MOZ_LOG_TEST(GetMacAccessibilityLog(), LogLevel::Verbose)) {
+ LOG(LogLevel::Verbose, @"%@ attributeValueForParam %@(%@) => %@", self,
+ attribute, parameter, value);
+ } else {
+ LOG(LogLevel::Debug, @"%@ attributeValueForParam %@", self, attribute);
+ }
+
+ return value;
+
+ NS_OBJC_END_TRY_BLOCK_RETURN(nil);
+}
+
+- (id)accessibilityHitTest:(NSPoint)point {
+ NS_OBJC_BEGIN_TRY_BLOCK_RETURN;
+ return GetObjectOrRepresentedView([self moxHitTest:point]);
+ NS_OBJC_END_TRY_BLOCK_RETURN(nil);
+}
+
+- (id)accessibilityFocusedUIElement {
+ NS_OBJC_BEGIN_TRY_BLOCK_RETURN;
+ return GetObjectOrRepresentedView([self moxFocusedUIElement]);
+ NS_OBJC_END_TRY_BLOCK_RETURN(nil);
+}
+
+- (BOOL)isAccessibilityElement {
+ NS_OBJC_BEGIN_TRY_BLOCK_RETURN;
+
+ if ([self isExpired]) {
+ return YES;
+ }
+
+ id parent = [self moxParent];
+ if (![parent isMOXAccessible]) {
+ return YES;
+ }
+
+ return ![self moxIgnoreWithParent:parent];
+
+ NS_OBJC_END_TRY_BLOCK_RETURN(NO);
+}
+
+- (BOOL)accessibilityNotifiesWhenDestroyed {
+ return YES;
+}
+
+#pragma mark - MOXAccessible protocol
+
+- (NSNumber*)moxIndexForChildUIElement:(id)child {
+ return @([[self moxUnignoredChildren] indexOfObject:child]);
+}
+
+- (id)moxTopLevelUIElement {
+ return [self moxWindow];
+}
+
+- (id)moxHitTest:(NSPoint)point {
+ return self;
+}
+
+- (id)moxFocusedUIElement {
+ return self;
+}
+
+- (void)moxPostNotification:(NSString*)notification {
+ [self moxPostNotification:notification withUserInfo:nil];
+}
+
+- (void)moxPostNotification:(NSString*)notification
+ withUserInfo:(NSDictionary*)userInfo {
+ if (MOZ_LOG_TEST(GetMacAccessibilityLog(), LogLevel::Verbose)) {
+ LOG(LogLevel::Verbose, @"%@ notify %@ %@", self, notification, userInfo);
+ } else {
+ LOG(LogLevel::Debug, @"%@ notify %@", self, notification);
+ }
+
+ // This sends events via nsIObserverService to be consumed by our mochitests.
+ xpcAccessibleMacEvent::FireEvent(self, notification, userInfo);
+
+ if (gfxPlatform::IsHeadless()) {
+ // Using a headless toolkit for tests and whatnot, posting accessibility
+ // notification won't work.
+ return;
+ }
+
+ if (![self isAccessibilityElement]) {
+ // If this is an ignored object, don't expose it to system.
+ return;
+ }
+
+ if (userInfo) {
+ NSAccessibilityPostNotificationWithUserInfo(
+ GetObjectOrRepresentedView(self), notification, userInfo);
+ } else {
+ NSAccessibilityPostNotification(GetObjectOrRepresentedView(self),
+ notification);
+ }
+}
+
+- (BOOL)moxBlockSelector:(SEL)selector {
+ return NO;
+}
+
+- (NSArray*)moxChildren {
+ return @[];
+}
+
+- (NSArray*)moxUnignoredChildren {
+ NSMutableArray* unignoredChildren =
+ [[[NSMutableArray alloc] init] autorelease];
+ NSArray* allChildren = [self moxChildren];
+
+ for (MOXAccessibleBase* nativeChild in allChildren) {
+ if ([nativeChild moxIgnoreWithParent:self]) {
+ // If this child should be ignored get its unignored children.
+ // This will in turn recurse to any unignored descendants if the
+ // child is ignored.
+ [unignoredChildren
+ addObjectsFromArray:[nativeChild moxUnignoredChildren]];
+ } else {
+ [unignoredChildren addObject:nativeChild];
+ }
+ }
+
+ return unignoredChildren;
+}
+
+- (id<mozAccessible>)moxParent {
+ return nil;
+}
+
+- (id<mozAccessible>)moxUnignoredParent {
+ id<mozAccessible> nativeParent = [self moxParent];
+ if (!nativeParent) {
+ return nil;
+ }
+
+ if (![nativeParent isAccessibilityElement]) {
+ if ([nativeParent conformsToProtocol:@protocol(MOXAccessible)] &&
+ [nativeParent respondsToSelector:@selector(moxUnignoredParent)]) {
+ // Cast away the protocol so we can cast to another protocol.
+ id bareNativeParent = nativeParent;
+ id<MOXAccessible> moxNativeParent = bareNativeParent;
+ return [moxNativeParent moxUnignoredParent];
+ }
+ }
+
+ return GetObjectOrRepresentedView(nativeParent);
+}
+
+- (BOOL)moxIgnoreWithParent:(MOXAccessibleBase*)parent {
+ return [parent moxIgnoreChild:self];
+}
+
+- (BOOL)moxIgnoreChild:(MOXAccessibleBase*)child {
+ return NO;
+}
+
+- (id<MOXTextMarkerSupport>)moxTextMarkerDelegate {
+ return nil;
+}
+
+- (BOOL)moxIsLiveRegion {
+ return NO;
+}
+
+#pragma mark -
+
+// objc-style description (from NSObject); not to be confused with the
+// accessible description above.
+- (NSString*)description {
+ if (MOZ_LOG_TEST(GetMacAccessibilityLog(), LogLevel::Debug)) {
+ if ([self isSelectorSupported:@selector(moxMozDebugDescription)]) {
+ return [self moxMozDebugDescription];
+ }
+ }
+
+ return [NSString stringWithFormat:@"<%@: %p %@>",
+ NSStringFromClass([self class]), self,
+ [self moxRole]];
+}
+
+- (BOOL)isExpired {
+ return mIsExpired;
+}
+
+- (void)expire {
+ MOZ_ASSERT(!mIsExpired, "expire called an expired mozAccessible!");
+
+ mIsExpired = YES;
+
+ [self moxPostNotification:NSAccessibilityUIElementDestroyedNotification];
+}
+
+- (id<MOXAccessible>)moxFindAncestor:(BOOL (^)(id<MOXAccessible> moxAcc,
+ BOOL* stop))findBlock {
+ for (id element = self; [element conformsToProtocol:@protocol(MOXAccessible)];
+ element = [element moxUnignoredParent]) {
+ BOOL stop = NO;
+ if (findBlock(element, &stop)) {
+ return element;
+ }
+
+ if (stop || ![element respondsToSelector:@selector(moxUnignoredParent)]) {
+ break;
+ }
+ }
+
+ return nil;
+}
+
+#pragma mark - Private
+
+- (BOOL)isSelectorSupported:(SEL)selector {
+ return
+ [self respondsToSelector:selector] && ![self moxBlockSelector:selector];
+}
+
+@end