1 files changed, 116 insertions, 0 deletions
diff --git a/dom/xslt/xpath/txNumberExpr.cpp b/dom/xslt/xpath/txNumberExpr.cpp
new file mode 100644
index 000000000..1defe905b
--- /dev/null
+++ b/dom/xslt/xpath/txNumberExpr.cpp
@@ -0,0 +1,116 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* 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/. */
+
+#include "mozilla/FloatingPoint.h"
+
+#include "txExpr.h"
+#include <math.h>
+#include "txIXPathContext.h"
+
+nsresult
+txNumberExpr::evaluate(txIEvalContext* aContext, txAExprResult** aResult)
+{
+    *aResult = nullptr;
+
+    RefPtr<txAExprResult> exprRes;
+    nsresult rv = mRightExpr->evaluate(aContext, getter_AddRefs(exprRes));
+    NS_ENSURE_SUCCESS(rv, rv);
+
+    double rightDbl = exprRes->numberValue();
+
+    rv = mLeftExpr->evaluate(aContext, getter_AddRefs(exprRes));
+    NS_ENSURE_SUCCESS(rv, rv);
+
+    double leftDbl = exprRes->numberValue();
+    double result = 0;
+
+    switch (mOp) {
+        case ADD:
+            result = leftDbl + rightDbl;
+            break;
+
+        case SUBTRACT:
+            result = leftDbl - rightDbl;
+            break;
+
+        case DIVIDE:
+            if (rightDbl == 0) {
+#if defined(XP_WIN)
+                /* XXX MSVC miscompiles such that (NaN == 0) */
+                if (mozilla::IsNaN(rightDbl))
+                    result = mozilla::UnspecifiedNaN<double>();
+                else
+#endif
+                if (leftDbl == 0 || mozilla::IsNaN(leftDbl))
+                    result = mozilla::UnspecifiedNaN<double>();
+                else if (mozilla::IsNegative(leftDbl) != mozilla::IsNegative(rightDbl))
+                    result = mozilla::NegativeInfinity<double>();
+                else
+                    result = mozilla::PositiveInfinity<double>();
+            }
+            else
+                result = leftDbl / rightDbl;
+            break;
+
+        case MODULUS:
+            if (rightDbl == 0) {
+                result = mozilla::UnspecifiedNaN<double>();
+            }
+            else {
+#if defined(XP_WIN)
+                /* Workaround MS fmod bug where 42 % (1/0) => NaN, not 42. */
+                if (!mozilla::IsInfinite(leftDbl) && mozilla::IsInfinite(rightDbl))
+                    result = leftDbl;
+                else
+#endif
+                result = fmod(leftDbl, rightDbl);
+            }
+            break;
+
+        case MULTIPLY:
+            result = leftDbl * rightDbl;
+            break;
+    }
+
+    return aContext->recycler()->getNumberResult(result, aResult);
+} //-- evaluate
+
+TX_IMPL_EXPR_STUBS_2(txNumberExpr, NUMBER_RESULT, mLeftExpr, mRightExpr)
+
+bool
+txNumberExpr::isSensitiveTo(ContextSensitivity aContext)
+{
+    return mLeftExpr->isSensitiveTo(aContext) ||
+           mRightExpr->isSensitiveTo(aContext);
+}
+
+#ifdef TX_TO_STRING
+void
+txNumberExpr::toString(nsAString& str)
+{
+    mLeftExpr->toString(str);
+
+    switch (mOp) {
+        case ADD:
+            str.AppendLiteral(" + ");
+            break;
+        case SUBTRACT:
+            str.AppendLiteral(" - ");
+            break;
+        case DIVIDE:
+            str.AppendLiteral(" div ");
+            break;
+        case MODULUS:
+            str.AppendLiteral(" mod ");
+            break;
+        case MULTIPLY:
+            str.AppendLiteral(" * ");
+            break;
+    }
+
+    mRightExpr->toString(str);
+
+}
+#endif