1 files changed, 174 insertions, 0 deletions
diff --git a/layout/mathml/nsMathMLOperators.h b/layout/mathml/nsMathMLOperators.h
new file mode 100644
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+++ b/layout/mathml/nsMathMLOperators.h
@@ -0,0 +1,174 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* 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/. */
+
+#ifndef nsMathMLOperators_h___
+#define nsMathMLOperators_h___
+
+#include <stdint.h>
+#include "nsStringFwd.h"
+
+enum nsStretchDirection {
+  NS_STRETCH_DIRECTION_UNSUPPORTED = -1,
+  NS_STRETCH_DIRECTION_DEFAULT = 0,
+  NS_STRETCH_DIRECTION_HORIZONTAL = 1,
+  NS_STRETCH_DIRECTION_VERTICAL = 2
+};
+
+typedef uint32_t nsOperatorFlags;
+enum {
+  // define the bits used to handle the operator
+  NS_MATHML_OPERATOR_MUTABLE = 1 << 30,
+  NS_MATHML_OPERATOR_EMBELLISH_ANCESTOR = 1 << 29,
+  NS_MATHML_OPERATOR_EMBELLISH_ISOLATED = 1 << 28,
+  NS_MATHML_OPERATOR_CENTERED = 1 << 27,
+  NS_MATHML_OPERATOR_INVISIBLE = 1 << 26,
+
+  // define the bits used in the Operator Dictionary
+
+  // the very last two bits tell us the form
+  NS_MATHML_OPERATOR_FORM = 0x3,
+  NS_MATHML_OPERATOR_FORM_INFIX = 1,
+  NS_MATHML_OPERATOR_FORM_PREFIX = 2,
+  NS_MATHML_OPERATOR_FORM_POSTFIX = 3,
+
+  // the next 2 bits tell us the direction
+  NS_MATHML_OPERATOR_DIRECTION = 0x3 << 2,
+  NS_MATHML_OPERATOR_DIRECTION_HORIZONTAL = 1 << 2,
+  NS_MATHML_OPERATOR_DIRECTION_VERTICAL = 2 << 2,
+
+  // other bits used in the Operator Dictionary
+  NS_MATHML_OPERATOR_STRETCHY = 1 << 4,
+  NS_MATHML_OPERATOR_FENCE = 1 << 5,
+  NS_MATHML_OPERATOR_ACCENT = 1 << 6,
+  NS_MATHML_OPERATOR_LARGEOP = 1 << 7,
+  NS_MATHML_OPERATOR_SEPARATOR = 1 << 8,
+  NS_MATHML_OPERATOR_MOVABLELIMITS = 1 << 9,
+  NS_MATHML_OPERATOR_SYMMETRIC = 1 << 10,
+
+  // Additional bits not stored in the dictionary
+  NS_MATHML_OPERATOR_MINSIZE_ABSOLUTE = 1 << 11,
+  NS_MATHML_OPERATOR_MAXSIZE_ABSOLUTE = 1 << 12,
+  NS_MATHML_OPERATOR_LSPACE_ATTR = 1 << 13,
+  NS_MATHML_OPERATOR_RSPACE_ATTR = 1 << 14
+};
+
+#define NS_MATHML_OPERATOR_SIZE_INFINITY (mozilla::PositiveInfinity<float>())
+
+class nsMathMLOperators {
+ public:
+  static void AddRefTable(void);
+  static void ReleaseTable(void);
+  static void CleanUp();
+
+  // LookupOperator:
+  // Given the string value of an operator and its form (last two bits of
+  // flags), this method returns attributes of the operator in the output
+  // parameters. The return value indicates whether an entry was found.
+  static bool LookupOperator(const nsString& aOperator, const uint8_t aForm,
+                             nsOperatorFlags* aFlags, float* aLeadingSpace,
+                             float* aTrailingSpace);
+
+  // LookupOperatorWithFallback:
+  // Same as LookupOperator but if the operator is not found under the supplied
+  // form, then the other forms are tried in the following order: infix, postfix
+  // prefix. The caller can test the output parameter aFlags to know exactly
+  // under which form the operator was found in the Operator Dictionary.
+  static bool LookupOperatorWithFallback(const nsString& aOperator,
+                                         const uint8_t aForm,
+                                         nsOperatorFlags* aFlags,
+                                         float* aLeadingSpace,
+                                         float* aTrailingSpace);
+
+  // Helper functions used by the nsMathMLChar class.
+  static bool IsMirrorableOperator(const nsString& aOperator);
+
+  // Helper functions used by the nsMathMLChar class to determine whether
+  // aOperator corresponds to an integral operator.
+  static bool IsIntegralOperator(const nsString& aOperator);
+
+  // Helper function used by the nsMathMLChar class.
+  static nsStretchDirection GetStretchyDirection(const nsString& aOperator);
+};
+
+////////////////////////////////////////////////////////////////////////////
+// Macros that retrieve the bits used to handle operators
+
+#define NS_MATHML_OPERATOR_IS_MUTABLE(_flags) \
+  (NS_MATHML_OPERATOR_MUTABLE == ((_flags)&NS_MATHML_OPERATOR_MUTABLE))
+
+#define NS_MATHML_OPERATOR_HAS_EMBELLISH_ANCESTOR(_flags) \
+  (NS_MATHML_OPERATOR_EMBELLISH_ANCESTOR ==               \
+   ((_flags)&NS_MATHML_OPERATOR_EMBELLISH_ANCESTOR))
+
+#define NS_MATHML_OPERATOR_EMBELLISH_IS_ISOLATED(_flags) \
+  (NS_MATHML_OPERATOR_EMBELLISH_ISOLATED ==              \
+   ((_flags)&NS_MATHML_OPERATOR_EMBELLISH_ISOLATED))
+
+#define NS_MATHML_OPERATOR_IS_CENTERED(_flags) \
+  (NS_MATHML_OPERATOR_CENTERED == ((_flags)&NS_MATHML_OPERATOR_CENTERED))
+
+#define NS_MATHML_OPERATOR_IS_INVISIBLE(_flags) \
+  (NS_MATHML_OPERATOR_INVISIBLE == ((_flags)&NS_MATHML_OPERATOR_INVISIBLE))
+
+#define NS_MATHML_OPERATOR_GET_FORM(_flags) ((_flags)&NS_MATHML_OPERATOR_FORM)
+
+#define NS_MATHML_OPERATOR_GET_DIRECTION(_flags) \
+  ((_flags)&NS_MATHML_OPERATOR_DIRECTION)
+
+#define NS_MATHML_OPERATOR_FORM_IS_INFIX(_flags) \
+  (NS_MATHML_OPERATOR_FORM_INFIX == ((_flags)&NS_MATHML_OPERATOR_FORM))
+
+#define NS_MATHML_OPERATOR_FORM_IS_PREFIX(_flags) \
+  (NS_MATHML_OPERATOR_FORM_PREFIX == ((_flags)&NS_MATHML_OPERATOR_FORM))
+
+#define NS_MATHML_OPERATOR_FORM_IS_POSTFIX(_flags) \
+  (NS_MATHML_OPERATOR_FORM_POSTFIX == ((_flags)&NS_MATHML_OPERATOR_FORM))
+
+#define NS_MATHML_OPERATOR_IS_DIRECTION_VERTICAL(_flags) \
+  (NS_MATHML_OPERATOR_DIRECTION_VERTICAL ==              \
+   ((_flags)&NS_MATHML_OPERATOR_DIRECTION))
+
+#define NS_MATHML_OPERATOR_IS_DIRECTION_HORIZONTAL(_flags) \
+  (NS_MATHML_OPERATOR_DIRECTION_HORIZONTAL ==              \
+   ((_flags)&NS_MATHML_OPERATOR_DIRECTION))
+
+#define NS_MATHML_OPERATOR_IS_STRETCHY(_flags) \
+  (NS_MATHML_OPERATOR_STRETCHY == ((_flags)&NS_MATHML_OPERATOR_STRETCHY))
+
+#define NS_MATHML_OPERATOR_IS_FENCE(_flags) \
+  (NS_MATHML_OPERATOR_FENCE == ((_flags)&NS_MATHML_OPERATOR_FENCE))
+
+#define NS_MATHML_OPERATOR_IS_ACCENT(_flags) \
+  (NS_MATHML_OPERATOR_ACCENT == ((_flags)&NS_MATHML_OPERATOR_ACCENT))
+
+#define NS_MATHML_OPERATOR_IS_LARGEOP(_flags) \
+  (NS_MATHML_OPERATOR_LARGEOP == ((_flags)&NS_MATHML_OPERATOR_LARGEOP))
+
+#define NS_MATHML_OPERATOR_IS_SEPARATOR(_flags) \
+  (NS_MATHML_OPERATOR_SEPARATOR == ((_flags)&NS_MATHML_OPERATOR_SEPARATOR))
+
+#define NS_MATHML_OPERATOR_IS_MOVABLELIMITS(_flags) \
+  (NS_MATHML_OPERATOR_MOVABLELIMITS ==              \
+   ((_flags)&NS_MATHML_OPERATOR_MOVABLELIMITS))
+
+#define NS_MATHML_OPERATOR_IS_SYMMETRIC(_flags) \
+  (NS_MATHML_OPERATOR_SYMMETRIC == ((_flags)&NS_MATHML_OPERATOR_SYMMETRIC))
+
+#define NS_MATHML_OPERATOR_MINSIZE_IS_ABSOLUTE(_flags) \
+  (NS_MATHML_OPERATOR_MINSIZE_ABSOLUTE ==              \
+   ((_flags)&NS_MATHML_OPERATOR_MINSIZE_ABSOLUTE))
+
+#define NS_MATHML_OPERATOR_MAXSIZE_IS_ABSOLUTE(_flags) \
+  (NS_MATHML_OPERATOR_MAXSIZE_ABSOLUTE ==              \
+   ((_flags)&NS_MATHML_OPERATOR_MAXSIZE_ABSOLUTE))
+
+#define NS_MATHML_OPERATOR_HAS_LSPACE_ATTR(_flags) \
+  (NS_MATHML_OPERATOR_LSPACE_ATTR == ((_flags)&NS_MATHML_OPERATOR_LSPACE_ATTR))
+
+#define NS_MATHML_OPERATOR_HAS_RSPACE_ATTR(_flags) \
+  (NS_MATHML_OPERATOR_RSPACE_ATTR == ((_flags)&NS_MATHML_OPERATOR_RSPACE_ATTR))
+
+#endif /* nsMathMLOperators_h___ */