1 files changed, 116 insertions, 0 deletions
diff --git a/accessible/mac/MOXMathAccessibles.mm b/accessible/mac/MOXMathAccessibles.mm
new file mode 100644
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+++ b/accessible/mac/MOXMathAccessibles.mm
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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 "MOXMathAccessibles.h"
+
+#import "MacUtils.h"
+
+using namespace mozilla::a11y;
+
+// XXX WebKit also defines the following attributes.
+// See bugs 1176970 and 1176983.
+// - NSAccessibilityMathFencedOpenAttribute @"AXMathFencedOpen"
+// - NSAccessibilityMathFencedCloseAttribute @"AXMathFencedClose"
+// - NSAccessibilityMathPrescriptsAttribute @"AXMathPrescripts"
+// - NSAccessibilityMathPostscriptsAttribute @"AXMathPostscripts"
+
+@implementation MOXMathRootAccessible
+
+- (id)moxMathRootRadicand {
+  return [self childAt:0];
+}
+
+- (id)moxMathRootIndex {
+  return [self childAt:1];
+}
+
+@end
+
+@implementation MOXMathSquareRootAccessible
+
+- (id)moxMathRootRadicand {
+  return [self childAt:0];
+}
+
+@end
+
+@implementation MOXMathFractionAccessible
+
+- (id)moxMathFractionNumerator {
+  return [self childAt:0];
+}
+
+- (id)moxMathFractionDenominator {
+  return [self childAt:1];
+}
+
+// Bug 1639745: This doesn't actually work.
+- (NSNumber*)moxMathLineThickness {
+  // WebKit sets line thickness to some logical value parsed in the
+  // renderer object of the <mfrac> element. It's not clear whether the
+  // exact value is relevant to assistive technologies. From a semantic
+  // point of view, the only important point is to distinguish between
+  // <mfrac> elements that have a fraction bar and those that do not.
+  // Per the MathML 3 spec, the latter happens iff the linethickness
+  // attribute is of the form [zero-float][optional-unit]. In that case we
+  // set line thickness to zero and in the other cases we set it to one.
+  if (NSString* thickness = utils::GetAccAttr(self, "thickness")) {
+    NSNumberFormatter* formatter =
+        [[[NSNumberFormatter alloc] init] autorelease];
+    NSNumber* value = [formatter numberFromString:thickness];
+    return [NSNumber numberWithBool:[value boolValue]];
+  } else {
+    return [NSNumber numberWithInteger:0];
+  }
+}
+
+@end
+
+@implementation MOXMathSubSupAccessible
+- (id)moxMathBase {
+  return [self childAt:0];
+}
+
+- (id)moxMathSubscript {
+  if (mRole == roles::MATHML_SUP) {
+    return nil;
+  }
+
+  return [self childAt:1];
+}
+
+- (id)moxMathSuperscript {
+  if (mRole == roles::MATHML_SUB) {
+    return nil;
+  }
+
+  return [self childAt:mRole == roles::MATHML_SUP ? 1 : 2];
+}
+
+@end
+
+@implementation MOXMathUnderOverAccessible
+- (id)moxMathBase {
+  return [self childAt:0];
+}
+
+- (id)moxMathUnder {
+  if (mRole == roles::MATHML_OVER) {
+    return nil;
+  }
+
+  return [self childAt:1];
+}
+
+- (id)moxMathOver {
+  if (mRole == roles::MATHML_UNDER) {
+    return nil;
+  }
+
+  return [self childAt:mRole == roles::MATHML_OVER ? 1 : 2];
+}
+@end