1 files changed, 181 insertions, 0 deletions
diff --git a/layout/mathml/nsMathMLOperators.h b/layout/mathml/nsMathMLOperators.h
new file mode 100644
index 000000000..d850c4b9d
--- /dev/null
+++ b/layout/mathml/nsMathMLOperators.h
@@ -0,0 +1,181 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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,
+  NS_MATHML_OPERATOR_INTEGRAL           = 1<<11,
+  NS_MATHML_OPERATOR_MIRRORABLE         = 1<<12,
+
+  // Additional bits not stored in the dictionary
+  NS_MATHML_OPERATOR_MINSIZE_ABSOLUTE   = 1<<13,
+  NS_MATHML_OPERATOR_MAXSIZE_ABSOLUTE   = 1<<14,
+  NS_MATHML_OPERATOR_LSPACE_ATTR     = 1<<15,
+  NS_MATHML_OPERATOR_RSPACE_ATTR    = 1<<16
+};
+
+#define NS_MATHML_OPERATOR_SIZE_INFINITY NS_IEEEPositiveInfinity()
+
+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 true if the operator is found in the Operator Dictionary.
+  // Attributes of the operator are returned in the output parameters.
+  // If the operator is not found under the supplied form but is found under a 
+  // different form, the method returns true as well. The caller can test the
+  // output parameter aFlags to know exactly under which form the operator was
+  // found in the Operator Dictionary.
+  static bool
+  LookupOperator(const nsString&       aOperator,
+                 const nsOperatorFlags aForm,
+                 nsOperatorFlags*      aFlags,
+                 float*                aLeadingSpace,
+                 float*                aTrailingSpace);
+
+   // LookupOperators:
+   // Helper to return all the forms under which an operator is listed in the
+   // Operator Dictionary. The caller must pass arrays of size 4, and use 
+   // aFlags[NS_MATHML_OPERATOR_FORM_{INFIX|POSTFIX|PREFIX}],
+   // aLeadingSpace[], etc, to access the attributes of the operator under a
+   // particular form. If the operator wasn't found under a form, its entry
+   // aFlags[form] is set to zero.
+   static void
+   LookupOperators(const nsString&       aOperator,
+                   nsOperatorFlags*      aFlags,
+                   float*                aLeadingSpace,
+                   float*                aTrailingSpace);
+
+  // Helper functions used by the nsMathMLChar class.
+  static bool
+  IsMirrorableOperator(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_IS_INTEGRAL(_flags) \
+  (NS_MATHML_OPERATOR_INTEGRAL == ((_flags) & NS_MATHML_OPERATOR_INTEGRAL))
+
+#define NS_MATHML_OPERATOR_IS_MIRRORABLE(_flags) \
+  (NS_MATHML_OPERATOR_MIRRORABLE == ((_flags) & NS_MATHML_OPERATOR_MIRRORABLE))
+
+#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___ */