The Tor Browser: layout/mathml/nsMathMLOperators.cpp@925c144e1f1f (annotated)

layout/mathml/nsMathMLOperators.cpp@925c144e1f1f (annotated)

layout/mathml/nsMathMLOperators.cpp

Fri, 16 Jan 2015 18:13:44 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Fri, 16 Jan 2015 18:13:44 +0100
branch: TOR_BUG_9701
changeset 14: 925c144e1f1f
permissions: -rw-r--r--

Integrate suggestion from review to improve consistency with existing code.

 /* -*- 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/. */
 #include "nsMathMLOperators.h"
 #include "nsCOMPtr.h"
 #include "nsDataHashtable.h"
 #include "nsHashKeys.h"
 #include "nsTArray.h"
 #include "nsIPersistentProperties2.h"
 #include "nsNetUtil.h"
 #include "nsCRT.h"
 // operator dictionary entry
 struct OperatorData {
   OperatorData(void)
     : mFlags(0),
       mLeadingSpace(0.0f),
       mTrailingSpace(0.0f)
   {
   }
   // member data
   nsString        mStr;
   nsOperatorFlags mFlags;
   float           mLeadingSpace;   // unit is em
   float           mTrailingSpace;  // unit is em
 };
 static int32_t         gTableRefCount = 0;
 static uint32_t        gOperatorCount = 0;
 static OperatorData*   gOperatorArray = nullptr;
 static nsDataHashtable<nsStringHashKey, OperatorData*>* gOperatorTable = nullptr;
 static bool            gGlobalsInitialized   = false;
 static const char16_t kDashCh  = char16_t('#');
 static const char16_t kColonCh = char16_t(':');
 static void
 SetBooleanProperty(OperatorData* aOperatorData,
                    nsString      aName)
 {
   if (aName.IsEmpty())
     return;
   if (aName.EqualsLiteral("stretchy") && (1 == aOperatorData->mStr.Length()))
     aOperatorData->mFlags |= NS_MATHML_OPERATOR_STRETCHY;
   else if (aName.EqualsLiteral("fence"))
     aOperatorData->mFlags |= NS_MATHML_OPERATOR_FENCE;
   else if (aName.EqualsLiteral("accent"))
     aOperatorData->mFlags |= NS_MATHML_OPERATOR_ACCENT;
   else if (aName.EqualsLiteral("largeop"))
     aOperatorData->mFlags |= NS_MATHML_OPERATOR_LARGEOP;
   else if (aName.EqualsLiteral("separator"))
     aOperatorData->mFlags |=  NS_MATHML_OPERATOR_SEPARATOR;
   else if (aName.EqualsLiteral("movablelimits"))
     aOperatorData->mFlags |= NS_MATHML_OPERATOR_MOVABLELIMITS;
   else if (aName.EqualsLiteral("symmetric"))
     aOperatorData->mFlags |= NS_MATHML_OPERATOR_SYMMETRIC;
   else if (aName.EqualsLiteral("integral"))
     aOperatorData->mFlags |= NS_MATHML_OPERATOR_INTEGRAL;
   else if (aName.EqualsLiteral("mirrorable"))
     aOperatorData->mFlags |= NS_MATHML_OPERATOR_MIRRORABLE;
 }
 static void
 SetProperty(OperatorData* aOperatorData,
             nsString      aName,
             nsString      aValue)
 {
   if (aName.IsEmpty() || aValue.IsEmpty())
     return;
   // XXX These ones are not kept in the dictionary
   // Support for these requires nsString member variables
   // maxsize (default: infinity)
   // minsize (default: 1)
   if (aName.EqualsLiteral("direction")) {
     if (aValue.EqualsLiteral("vertical"))
       aOperatorData->mFlags |= NS_MATHML_OPERATOR_DIRECTION_VERTICAL;
     else if (aValue.EqualsLiteral("horizontal"))
       aOperatorData->mFlags |= NS_MATHML_OPERATOR_DIRECTION_HORIZONTAL;
     else return; // invalid value
   } else {
     bool isLeadingSpace;
     if (aName.EqualsLiteral("lspace"))
       isLeadingSpace = true;
     else if (aName.EqualsLiteral("rspace"))
       isLeadingSpace = false;
     else return;  // input is not applicable
     // aValue is assumed to be a digit from 0 to 7
     nsresult error = NS_OK;
     float space = aValue.ToFloat(&error) / 18.0;
     if (NS_FAILED(error)) return;
     if (isLeadingSpace)
       aOperatorData->mLeadingSpace = space;
     else
       aOperatorData->mTrailingSpace = space;
   }
 }
 static bool
 SetOperator(OperatorData*   aOperatorData,
             nsOperatorFlags aForm,
             const nsCString& aOperator,
             nsString&        aAttributes)
 {
   static const char16_t kNullCh = char16_t('\0');
   // aOperator is in the expanded format \uNNNN\uNNNN ...
   // First compress these Unicode points to the internal nsString format
   int32_t i = 0;
   nsAutoString name, value;
   int32_t len = aOperator.Length();
   char16_t c = aOperator[i++];
   uint32_t state  = 0;
   char16_t uchar = 0;
   while (i <= len) {
     if (0 == state) {
       if (c != '\\')
         return false;
       if (i < len)
         c = aOperator[i];
       i++;
       if (('u' != c) && ('U' != c))
         return false;
       if (i < len)
         c = aOperator[i];
       i++;
       state++;
     }
     else {
       if (('0' <= c) && (c <= '9'))
          uchar = (uchar << 4) | (c - '0');
       else if (('a' <= c) && (c <= 'f'))
          uchar = (uchar << 4) | (c - 'a' + 0x0a);
       else if (('A' <= c) && (c <= 'F'))
          uchar = (uchar << 4) | (c - 'A' + 0x0a);
       else return false;
       if (i < len)
         c = aOperator[i];
       i++;
       state++;
       if (5 == state) {
         value.Append(uchar);
         uchar = 0;
         state = 0;
       }
     }
   }
   if (0 != state) return false;
   // Quick return when the caller doesn't care about the attributes and just wants
   // to know if this is a valid operator (this is the case at the first pass of the
   // parsing of the dictionary in InitOperators())
   if (!aForm) return true;
   // Add operator to hash table
   aOperatorData->mFlags |= aForm;
   aOperatorData->mStr.Assign(value);
   value.AppendInt(aForm, 10);
   gOperatorTable->Put(value, aOperatorData);
 #ifdef DEBUG
   NS_LossyConvertUTF16toASCII str(aAttributes);
 #endif
   // Loop over the space-delimited list of attributes to get the name:value pairs
   aAttributes.Append(kNullCh);  // put an extra null at the end
   char16_t* start = aAttributes.BeginWriting();
   char16_t* end   = start;
   while ((kNullCh != *start) && (kDashCh != *start)) {
     name.SetLength(0);
     value.SetLength(0);
     // skip leading space, the dash amounts to the end of the line
     while ((kNullCh!=*start) && (kDashCh!=*start) && nsCRT::IsAsciiSpace(*start)) {
       ++start;
     }
     end = start;
     // look for ':'
     while ((kNullCh!=*end) && (kDashCh!=*end) && !nsCRT::IsAsciiSpace(*end) &&
            (kColonCh!=*end)) {
       ++end;
     }
     // If ':' is not found, then it's a boolean property
     bool IsBooleanProperty = (kColonCh != *end);
     *end = kNullCh; // end segment here
     // this segment is the name
     if (start < end) {
       name.Assign(start);
     }
     if (IsBooleanProperty) {
       SetBooleanProperty(aOperatorData, name);
     } else {
       start = ++end;
       // look for space or end of line
       while ((kNullCh!=*end) && (kDashCh!=*end) &&
              !nsCRT::IsAsciiSpace(*end)) {
         ++end;
       }
       *end = kNullCh; // end segment here
       if (start < end) {
         // this segment is the value
         value.Assign(start);
       }
       SetProperty(aOperatorData, name, value);
     }
     start = ++end;
   }
   return true;
 }
 static nsresult
 InitOperators(void)
 {
   // Load the property file containing the Operator Dictionary
   nsresult rv;
   nsCOMPtr<nsIPersistentProperties> mathfontProp;
   rv = NS_LoadPersistentPropertiesFromURISpec(getter_AddRefs(mathfontProp),
        NS_LITERAL_CSTRING("resource://gre/res/fonts/mathfont.properties"));
   if (NS_FAILED(rv)) return rv;
   // Parse the Operator Dictionary in two passes.
   // The first pass is to count the number of operators; the second pass is to
   // allocate the necessary space for them and to add them in the hash table.
   for (int32_t pass = 1; pass <= 2; pass++) {
     OperatorData dummyData;
     OperatorData* operatorData = &dummyData;
     nsCOMPtr<nsISimpleEnumerator> iterator;
     if (NS_SUCCEEDED(mathfontProp->Enumerate(getter_AddRefs(iterator)))) {
       bool more;
       uint32_t index = 0;
       nsAutoCString name;
       nsAutoString attributes;
       while ((NS_SUCCEEDED(iterator->HasMoreElements(&more))) && more) {
         nsCOMPtr<nsISupports> supports;
         nsCOMPtr<nsIPropertyElement> element;
         if (NS_SUCCEEDED(iterator->GetNext(getter_AddRefs(supports)))) {
           element = do_QueryInterface(supports);
           if (NS_SUCCEEDED(element->GetKey(name)) &&
               NS_SUCCEEDED(element->GetValue(attributes))) {
             // expected key: operator.\uNNNN.{infix,postfix,prefix}
             if ((21 <= name.Length()) && (0 == name.Find("operator.\\u"))) {
               name.Cut(0, 9); // 9 is the length of "operator.";
               int32_t len = name.Length();
               nsOperatorFlags form = 0;
               if (kNotFound != name.RFind(".infix")) {
                 form = NS_MATHML_OPERATOR_FORM_INFIX;
                 len -= 6;  // 6 is the length of ".infix";
               }
               else if (kNotFound != name.RFind(".postfix")) {
                 form = NS_MATHML_OPERATOR_FORM_POSTFIX;
                 len -= 8; // 8 is the length of ".postfix";
               }
               else if (kNotFound != name.RFind(".prefix")) {
                 form = NS_MATHML_OPERATOR_FORM_PREFIX;
                 len -= 7; // 7 is the length of ".prefix";
               }
               else continue; // input is not applicable
               name.SetLength(len);
               if (2 == pass) { // allocate space and start the storage
                 if (!gOperatorArray) {
                   if (0 == gOperatorCount) return NS_ERROR_UNEXPECTED;
                   gOperatorArray = new OperatorData[gOperatorCount];
                   if (!gOperatorArray) return NS_ERROR_OUT_OF_MEMORY;
                 }
                 operatorData = &gOperatorArray[index];
               }
               else {
                 form = 0; // to quickly return from SetOperator() at pass 1
               }
               // See if the operator should be retained
               if (SetOperator(operatorData, form, name, attributes)) {
                 index++;
                 if (1 == pass) gOperatorCount = index;
               }
             }
           }
         }
       }
     }
   }
   return NS_OK;
 }
 static nsresult
 InitGlobals()
 {
   gGlobalsInitialized = true;
   nsresult rv = NS_ERROR_OUT_OF_MEMORY;
   gOperatorTable = new nsDataHashtable<nsStringHashKey, OperatorData*>();
   if (gOperatorTable) {
     rv = InitOperators();
   }
   if (NS_FAILED(rv))
     nsMathMLOperators::CleanUp();
   return rv;
 }
 void
 nsMathMLOperators::CleanUp()
 {
   if (gOperatorArray) {
     delete[] gOperatorArray;
     gOperatorArray = nullptr;
   }
   if (gOperatorTable) {
     delete gOperatorTable;
     gOperatorTable = nullptr;
   }
 }
 void
 nsMathMLOperators::AddRefTable(void)
 {
   gTableRefCount++;
 }
 void
 nsMathMLOperators::ReleaseTable(void)
 {
   if (0 == --gTableRefCount) {
     CleanUp();
   }
 }
 static OperatorData*
 GetOperatorData(const nsString& aOperator, nsOperatorFlags aForm)
 {
   nsAutoString key(aOperator);
   key.AppendInt(aForm);
   return gOperatorTable->Get(key);
 }
 bool
 nsMathMLOperators::LookupOperator(const nsString&       aOperator,
                                   const nsOperatorFlags aForm,
                                   nsOperatorFlags*      aFlags,
                                   float*                aLeadingSpace,
                                   float*                aTrailingSpace)
 {
   if (!gGlobalsInitialized) {
     InitGlobals();
   }
   if (gOperatorTable) {
     NS_ASSERTION(aFlags && aLeadingSpace && aTrailingSpace, "bad usage");
     NS_ASSERTION(aForm > 0 && aForm < 4, "*** invalid call ***");
     // The MathML REC says:
     // If the operator does not occur in the dictionary with the specified form,
     // the renderer should use one of the forms which is available there, in the
     // order of preference: infix, postfix, prefix.
     OperatorData* found;
     int32_t form = NS_MATHML_OPERATOR_GET_FORM(aForm);
     if (!(found = GetOperatorData(aOperator, form))) {
       if (form == NS_MATHML_OPERATOR_FORM_INFIX ||
           !(found =
             GetOperatorData(aOperator, NS_MATHML_OPERATOR_FORM_INFIX))) {
         if (form == NS_MATHML_OPERATOR_FORM_POSTFIX ||
             !(found =
               GetOperatorData(aOperator, NS_MATHML_OPERATOR_FORM_POSTFIX))) {
           if (form != NS_MATHML_OPERATOR_FORM_PREFIX) {
             found = GetOperatorData(aOperator, NS_MATHML_OPERATOR_FORM_PREFIX);
           }
         }
       }
     }
     if (found) {
       NS_ASSERTION(found->mStr.Equals(aOperator), "bad setup");
       *aLeadingSpace = found->mLeadingSpace;
       *aTrailingSpace = found->mTrailingSpace;
       *aFlags &= ~NS_MATHML_OPERATOR_FORM; // clear the form bits
       *aFlags |= found->mFlags; // just add bits without overwriting
       return true;
     }
   }
   return false;
 }
 void
 nsMathMLOperators::LookupOperators(const nsString&       aOperator,
                                    nsOperatorFlags*      aFlags,
                                    float*                aLeadingSpace,
                                    float*                aTrailingSpace)
 {
   if (!gGlobalsInitialized) {
     InitGlobals();
   }
   aFlags[NS_MATHML_OPERATOR_FORM_INFIX] = 0;
   aLeadingSpace[NS_MATHML_OPERATOR_FORM_INFIX] = 0.0f;
   aTrailingSpace[NS_MATHML_OPERATOR_FORM_INFIX] = 0.0f;
   aFlags[NS_MATHML_OPERATOR_FORM_POSTFIX] = 0;
   aLeadingSpace[NS_MATHML_OPERATOR_FORM_POSTFIX] = 0.0f;
   aTrailingSpace[NS_MATHML_OPERATOR_FORM_POSTFIX] = 0.0f;
   aFlags[NS_MATHML_OPERATOR_FORM_PREFIX] = 0;
   aLeadingSpace[NS_MATHML_OPERATOR_FORM_PREFIX] = 0.0f;
   aTrailingSpace[NS_MATHML_OPERATOR_FORM_PREFIX] = 0.0f;
   if (gOperatorTable) {
     OperatorData* found;
     found = GetOperatorData(aOperator, NS_MATHML_OPERATOR_FORM_INFIX);
     if (found) {
       aFlags[NS_MATHML_OPERATOR_FORM_INFIX] = found->mFlags;
       aLeadingSpace[NS_MATHML_OPERATOR_FORM_INFIX] = found->mLeadingSpace;
       aTrailingSpace[NS_MATHML_OPERATOR_FORM_INFIX] = found->mTrailingSpace;
     }
     found = GetOperatorData(aOperator, NS_MATHML_OPERATOR_FORM_POSTFIX);
     if (found) {
       aFlags[NS_MATHML_OPERATOR_FORM_POSTFIX] = found->mFlags;
       aLeadingSpace[NS_MATHML_OPERATOR_FORM_POSTFIX] = found->mLeadingSpace;
       aTrailingSpace[NS_MATHML_OPERATOR_FORM_POSTFIX] = found->mTrailingSpace;
     }
     found = GetOperatorData(aOperator, NS_MATHML_OPERATOR_FORM_PREFIX);
     if (found) {
       aFlags[NS_MATHML_OPERATOR_FORM_PREFIX] = found->mFlags;
       aLeadingSpace[NS_MATHML_OPERATOR_FORM_PREFIX] = found->mLeadingSpace;
       aTrailingSpace[NS_MATHML_OPERATOR_FORM_PREFIX] = found->mTrailingSpace;
     }
   }
 }
 /* static */ bool
 nsMathMLOperators::IsMirrorableOperator(const nsString& aOperator)
 {
   // LookupOperator will search infix, postfix and prefix forms of aOperator and
   // return the first form found. It is assumed that all these forms have same
   // mirrorability.
   nsOperatorFlags flags = 0;
   float dummy;
   nsMathMLOperators::LookupOperator(aOperator,
                                     NS_MATHML_OPERATOR_FORM_INFIX,
                                     &flags, &dummy, &dummy);
   return NS_MATHML_OPERATOR_IS_MIRRORABLE(flags);
 }
 /* static */ nsStretchDirection
 nsMathMLOperators::GetStretchyDirection(const nsString& aOperator)
 {
   // LookupOperator will search infix, postfix and prefix forms of aOperator and
   // return the first form found. It is assumed that all these forms have same
   // direction.
   nsOperatorFlags flags = 0;
   float dummy;
   nsMathMLOperators::LookupOperator(aOperator,
                                     NS_MATHML_OPERATOR_FORM_INFIX,
                                     &flags, &dummy, &dummy);
   if (NS_MATHML_OPERATOR_IS_DIRECTION_VERTICAL(flags)) {
       return NS_STRETCH_DIRECTION_VERTICAL;
   } else if (NS_MATHML_OPERATOR_IS_DIRECTION_HORIZONTAL(flags)) {
     return NS_STRETCH_DIRECTION_HORIZONTAL;
   } else {
     return NS_STRETCH_DIRECTION_UNSUPPORTED;
   }
 }

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layout/mathml/nsMathMLOperators.cpp@925c144e1f1f (annotated)

layout/mathml/nsMathMLOperators.cpp