gecko-dev/layout/mathml/nsMathMLOperators.h

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is Mozilla MathML Project.
 *
 * The Initial Developer of the Original Code is
 * The University Of Queensland.
 * Portions created by the Initial Developer are Copyright (C) 1999
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   Roger B. Sidje <rbs@maths.uq.edu.au>
 *   Karl Tomlinson <karlt+@karlt.net>, Mozilla Corporation
 *   Frederic Wang <fred.wang@free.fr>
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either of the GNU General Public License Version 2 or later (the "GPL"),
 * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */

#ifndef nsMathMLOperators_h___
#define nsMathMLOperators_h___

#include "nsCoord.h"

enum nsStretchDirection {
  NS_STRETCH_DIRECTION_UNSUPPORTED = -1,
  NS_STRETCH_DIRECTION_DEFAULT     =  0,
  NS_STRETCH_DIRECTION_HORIZONTAL  =  1,
  NS_STRETCH_DIRECTION_VERTICAL    =  2
};

typedef PRUint32 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_LEFTSPACE_ATTR     = 1<<13,
  NS_MATHML_OPERATOR_RIGHTSPACE_ATTR    = 1<<14
};

#define NS_MATHML_OPERATOR_SIZE_INFINITY NS_IEEEPositiveInfinity()

// Style invariant characters (chars have their own intrinsic predefined style)
enum eMATHVARIANT {
  eMATHVARIANT_NONE = -1,
  eMATHVARIANT_normal = 0,
  eMATHVARIANT_bold,
  eMATHVARIANT_italic,
  eMATHVARIANT_bold_italic,
  eMATHVARIANT_sans_serif,
  eMATHVARIANT_bold_sans_serif,
  eMATHVARIANT_sans_serif_italic,
  eMATHVARIANT_sans_serif_bold_italic,
  eMATHVARIANT_monospace,
  eMATHVARIANT_script,
  eMATHVARIANT_bold_script,
  eMATHVARIANT_fraktur,
  eMATHVARIANT_bold_fraktur,
  eMATHVARIANT_double_struck,
  eMATHVARIANT_COUNT
};

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 PRBool
  LookupOperator(const nsString&       aOperator,
                 const nsOperatorFlags aForm,
                 nsOperatorFlags*      aFlags,
                 float*                aLeftSpace,
                 float*                aRightSpace);

   // 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}], aLeftSpace[], 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*                aLeftSpace,
                   float*                aRightSpace);

  // IsMutableOperator:
  // Return true if the operator exists and is stretchy or largeop
  static PRBool
  IsMutableOperator(const nsString& aOperator);

  // Helper functions for stretchy operators. These are used by the
  // nsMathMLChar class.
  static PRInt32 CountStretchyOperator();
  static PRInt32 FindStretchyOperator(PRUnichar aOperator);
  static nsStretchDirection GetStretchyDirectionAt(PRInt32 aIndex);
  static void DisableStretchyOperatorAt(PRInt32 aIndex);

  // Return the variant type of one Unicode Mathematical Alphanumeric Symbol
  // character (which may be represented by a surrogate pair), or return
  // eMATHVARIANT_NONE if aChar is not such a character.
  static eMATHVARIANT LookupInvariantChar(const nsAString& aChar);

  // Return the styled Mathematical Alphanumeric Symbol character
  // corresponding to a BMP character and a mathvariant value, or return aChar
  // if there is no such corresponding character.
  // Note the result may be dependent on aChar, and should be considered a
  // temporary.
  static const nsDependentSubstring
  TransformVariantChar(const PRUnichar& aChar, eMATHVARIANT aVariant);
};


////////////////////////////////////////////////////////////////////////////
// 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_LEFTSPACE_ATTR(_flags) \
  (NS_MATHML_OPERATOR_LEFTSPACE_ATTR == ((_flags) & NS_MATHML_OPERATOR_LEFTSPACE_ATTR))

#define NS_MATHML_OPERATOR_HAS_RIGHTSPACE_ATTR(_flags) \
  (NS_MATHML_OPERATOR_RIGHTSPACE_ATTR == ((_flags) & NS_MATHML_OPERATOR_RIGHTSPACE_ATTR))

#endif /* nsMathMLOperators_h___ */