The Tor Browser: accessible/src/atk/nsMaiInterfaceText.cpp@97036ab72558 (annotated)

accessible/src/atk/nsMaiInterfaceText.cpp@97036ab72558 (annotated)

accessible/src/atk/nsMaiInterfaceText.cpp

Tue, 06 Jan 2015 21:39:09 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Tue, 06 Jan 2015 21:39:09 +0100
branch: TOR_BUG_9701
changeset 8: 97036ab72558
permissions: -rw-r--r--

Conditionally force memory storage according to privacy.thirdparty.isolate;
This solves Tor bug #9701, complying with disk avoidance documented in
https://www.torproject.org/projects/torbrowser/design/#disk-avoidance.

 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
 /* vim: set ts=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/. */
 #include "InterfaceInitFuncs.h"
 #include "Accessible-inl.h"
 #include "HyperTextAccessible-inl.h"
 #include "nsMai.h"
 #include "nsIAccessibleTypes.h"
 #include "nsIPersistentProperties2.h"
 #include "nsISimpleEnumerator.h"
 #include "mozilla/Likely.h"
 using namespace mozilla;
 using namespace mozilla::a11y;
 static const char* sAtkTextAttrNames[ATK_TEXT_ATTR_LAST_DEFINED];
 static AtkAttributeSet*
 ConvertToAtkTextAttributeSet(nsIPersistentProperties* aAttributes)
 {
   if (!aAttributes)
     return nullptr;
   AtkAttributeSet* objAttributeSet = nullptr;
   nsCOMPtr<nsISimpleEnumerator> propEnum;
   nsresult rv = aAttributes->Enumerate(getter_AddRefs(propEnum));
   NS_ENSURE_SUCCESS(rv, nullptr);
   bool hasMore = false;
   while (NS_SUCCEEDED(propEnum->HasMoreElements(&hasMore)) && hasMore) {
     nsCOMPtr<nsISupports> sup;
     rv = propEnum->GetNext(getter_AddRefs(sup));
     NS_ENSURE_SUCCESS(rv, objAttributeSet);
     nsCOMPtr<nsIPropertyElement> propElem(do_QueryInterface(sup));
     NS_ENSURE_TRUE(propElem, objAttributeSet);
     nsAutoCString name;
     rv = propElem->GetKey(name);
     NS_ENSURE_SUCCESS(rv, objAttributeSet);
     nsAutoString value;
     rv = propElem->GetValue(value);
     NS_ENSURE_SUCCESS(rv, objAttributeSet);
     AtkAttribute* objAttr = (AtkAttribute*)g_malloc(sizeof(AtkAttribute));
     objAttr->name = g_strdup(name.get());
     objAttr->value = g_strdup(NS_ConvertUTF16toUTF8(value).get());
     objAttributeSet = g_slist_prepend(objAttributeSet, objAttr);
     // Handle attributes where atk has its own name.
     const char* atkName = nullptr;
     nsAutoString atkValue;
     if (name.EqualsLiteral("color")) {
       // The format of the atk attribute is r,g,b and the gecko one is
       // rgb(r,g,b).
       atkValue = Substring(value, 5, value.Length() - 1);
       atkName = sAtkTextAttrNames[ATK_TEXT_ATTR_FG_COLOR];
     } else if (name.EqualsLiteral("background-color")) {
       // The format of the atk attribute is r,g,b and the gecko one is
       // rgb(r,g,b).
       atkValue = Substring(value, 5, value.Length() - 1);
       atkName = sAtkTextAttrNames[ATK_TEXT_ATTR_BG_COLOR];
     } else if (name.EqualsLiteral("font-family")) {
       atkValue = value;
       atkName = sAtkTextAttrNames[ATK_TEXT_ATTR_FAMILY_NAME];
     } else if (name.Equals("font-size")) {
       // ATK wants the number of pixels without px at the end.
       atkValue = StringHead(value, value.Length() - 2);
       atkName = sAtkTextAttrNames[ATK_TEXT_ATTR_SIZE];
     } else if (name.EqualsLiteral("font-weight")) {
       atkValue = value;
       atkName = sAtkTextAttrNames[ATK_TEXT_ATTR_WEIGHT];
     } else if (name.EqualsLiteral("invalid")) {
       atkValue = value;
       atkName = sAtkTextAttrNames[ATK_TEXT_ATTR_INVALID];
     }
     if (atkName) {
       objAttr = static_cast<AtkAttribute*>(g_malloc(sizeof(AtkAttribute)));
       objAttr->name = g_strdup(atkName);
       objAttr->value = g_strdup(NS_ConvertUTF16toUTF8(atkValue).get());
       objAttributeSet = g_slist_prepend(objAttributeSet, objAttr);
     }
   }
   // libatk-adaptor will free it
   return objAttributeSet;
 }
 static void
 ConvertTexttoAsterisks(AccessibleWrap* accWrap, nsAString& aString)
 {
   // convert each char to "*" when it's "password text"
   if (accWrap->NativeRole() == roles::PASSWORD_TEXT) {
     for (uint32_t i = 0; i < aString.Length(); i++)
       aString.Replace(i, 1, NS_LITERAL_STRING("*"));
   }
 }
 extern "C" {
 static gchar*
 getTextCB(AtkText *aText, gint aStartOffset, gint aEndOffset)
 {
   AccessibleWrap* accWrap = GetAccessibleWrap(ATK_OBJECT(aText));
   if (!accWrap)
     return nullptr;
   HyperTextAccessible* text = accWrap->AsHyperText();
   if (!text || !text->IsTextRole())
     return nullptr;
     nsAutoString autoStr;
     text->TextSubstring(aStartOffset, aEndOffset, autoStr);
     ConvertTexttoAsterisks(accWrap, autoStr);
     NS_ConvertUTF16toUTF8 cautoStr(autoStr);
     //copy and return, libspi will free it.
     return (cautoStr.get()) ? g_strdup(cautoStr.get()) : nullptr;
 }
 static gchar*
 getTextAfterOffsetCB(AtkText *aText, gint aOffset,
                      AtkTextBoundary aBoundaryType,
                      gint *aStartOffset, gint *aEndOffset)
 {
   AccessibleWrap* accWrap = GetAccessibleWrap(ATK_OBJECT(aText));
   if (!accWrap)
     return nullptr;
   HyperTextAccessible* text = accWrap->AsHyperText();
   if (!text || !text->IsTextRole())
     return nullptr;
   nsAutoString autoStr;
   int32_t startOffset = 0, endOffset = 0;
   text->TextAfterOffset(aOffset, aBoundaryType, &startOffset, &endOffset, autoStr);
   *aStartOffset = startOffset;
   *aEndOffset = endOffset;
   ConvertTexttoAsterisks(accWrap, autoStr);
   NS_ConvertUTF16toUTF8 cautoStr(autoStr);
   return (cautoStr.get()) ? g_strdup(cautoStr.get()) : nullptr;
 }
 static gchar*
 getTextAtOffsetCB(AtkText *aText, gint aOffset,
                   AtkTextBoundary aBoundaryType,
                   gint *aStartOffset, gint *aEndOffset)
 {
   AccessibleWrap* accWrap = GetAccessibleWrap(ATK_OBJECT(aText));
   if (!accWrap)
     return nullptr;
   HyperTextAccessible* text = accWrap->AsHyperText();
   if (!text || !text->IsTextRole())
     return nullptr;
     nsAutoString autoStr;
     int32_t startOffset = 0, endOffset = 0;
     text->TextAtOffset(aOffset, aBoundaryType, &startOffset, &endOffset, autoStr);
     *aStartOffset = startOffset;
     *aEndOffset = endOffset;
     ConvertTexttoAsterisks(accWrap, autoStr);
     NS_ConvertUTF16toUTF8 cautoStr(autoStr);
     return (cautoStr.get()) ? g_strdup(cautoStr.get()) : nullptr;
 }
 static gunichar
 getCharacterAtOffsetCB(AtkText* aText, gint aOffset)
 {
   AccessibleWrap* accWrap = GetAccessibleWrap(ATK_OBJECT(aText));
   if (!accWrap)
     return 0;
   HyperTextAccessible* text = accWrap->AsHyperText();
   if (!text || !text->IsTextRole())
     return 0;
   // char16_t is unsigned short in Mozilla, gnuichar is guint32 in glib.
   return static_cast<gunichar>(text->CharAt(aOffset));
 }
 static gchar*
 getTextBeforeOffsetCB(AtkText *aText, gint aOffset,
                       AtkTextBoundary aBoundaryType,
                       gint *aStartOffset, gint *aEndOffset)
 {
   AccessibleWrap* accWrap = GetAccessibleWrap(ATK_OBJECT(aText));
   if (!accWrap)
     return nullptr;
   HyperTextAccessible* text = accWrap->AsHyperText();
   if (!text || !text->IsTextRole())
     return nullptr;
   nsAutoString autoStr;
   int32_t startOffset = 0, endOffset = 0;
   text->TextBeforeOffset(aOffset, aBoundaryType,
                          &startOffset, &endOffset, autoStr);
   *aStartOffset = startOffset;
   *aEndOffset = endOffset;
   ConvertTexttoAsterisks(accWrap, autoStr);
   NS_ConvertUTF16toUTF8 cautoStr(autoStr);
   return (cautoStr.get()) ? g_strdup(cautoStr.get()) : nullptr;
 }
 static gint
 getCaretOffsetCB(AtkText *aText)
 {
   AccessibleWrap* accWrap = GetAccessibleWrap(ATK_OBJECT(aText));
   if (!accWrap)
     return 0;
   HyperTextAccessible* text = accWrap->AsHyperText();
   if (!text || !text->IsTextRole())
     return 0;
   return static_cast<gint>(text->CaretOffset());
 }
 static AtkAttributeSet*
 getRunAttributesCB(AtkText *aText, gint aOffset,
                    gint *aStartOffset,
                    gint *aEndOffset)
 {
   *aStartOffset = -1;
   *aEndOffset = -1;
   AccessibleWrap* accWrap = GetAccessibleWrap(ATK_OBJECT(aText));
   if (!accWrap)
     return nullptr;
   HyperTextAccessible* text = accWrap->AsHyperText();
   if (!text || !text->IsTextRole())
     return nullptr;
   int32_t startOffset = 0, endOffset = 0;
   nsCOMPtr<nsIPersistentProperties> attributes =
     text->TextAttributes(false, aOffset, &startOffset, &endOffset);
   *aStartOffset = startOffset;
   *aEndOffset = endOffset;
   return ConvertToAtkTextAttributeSet(attributes);
 }
 static AtkAttributeSet*
 getDefaultAttributesCB(AtkText *aText)
 {
   AccessibleWrap* accWrap = GetAccessibleWrap(ATK_OBJECT(aText));
   if (!accWrap)
     return nullptr;
   HyperTextAccessible* text = accWrap->AsHyperText();
   if (!text || !text->IsTextRole())
     return nullptr;
   nsCOMPtr<nsIPersistentProperties> attributes = text->DefaultTextAttributes();
   return ConvertToAtkTextAttributeSet(attributes);
 }
 static void
 getCharacterExtentsCB(AtkText *aText, gint aOffset,
                       gint *aX, gint *aY,
                       gint *aWidth, gint *aHeight,
                       AtkCoordType aCoords)
 {
   AccessibleWrap* accWrap = GetAccessibleWrap(ATK_OBJECT(aText));
   if(!accWrap || !aX || !aY || !aWidth || !aHeight)
     return;
   HyperTextAccessible* text = accWrap->AsHyperText();
   if (!text || !text->IsTextRole())
     return;
     uint32_t geckoCoordType;
     if (aCoords == ATK_XY_SCREEN)
         geckoCoordType = nsIAccessibleCoordinateType::COORDTYPE_SCREEN_RELATIVE;
     else
         geckoCoordType = nsIAccessibleCoordinateType::COORDTYPE_WINDOW_RELATIVE;
   nsIntRect rect = text->CharBounds(aOffset, geckoCoordType);
   *aX = rect.x;
   *aY = rect.y;
   *aWidth = rect.width;
   *aHeight = rect.height;
 }
 static void
 getRangeExtentsCB(AtkText *aText, gint aStartOffset, gint aEndOffset,
                   AtkCoordType aCoords, AtkTextRectangle *aRect)
 {
   AccessibleWrap* accWrap = GetAccessibleWrap(ATK_OBJECT(aText));
   if(!accWrap || !aRect)
     return;
   HyperTextAccessible* text = accWrap->AsHyperText();
   if (!text || !text->IsTextRole())
     return;
     uint32_t geckoCoordType;
     if (aCoords == ATK_XY_SCREEN)
         geckoCoordType = nsIAccessibleCoordinateType::COORDTYPE_SCREEN_RELATIVE;
     else
         geckoCoordType = nsIAccessibleCoordinateType::COORDTYPE_WINDOW_RELATIVE;
   nsIntRect rect = text->TextBounds(aStartOffset, aEndOffset, geckoCoordType);
   aRect->x = rect.x;
   aRect->y = rect.y;
   aRect->width = rect.width;
   aRect->height = rect.height;
 }
 static gint
 getCharacterCountCB(AtkText *aText)
 {
   AccessibleWrap* accWrap = GetAccessibleWrap(ATK_OBJECT(aText));
   if (!accWrap)
     return 0;
   HyperTextAccessible* textAcc = accWrap->AsHyperText();
   return textAcc->IsDefunct() ?
 : static_cast<gint>(textAcc->CharacterCount());
 }
 static gint
 getOffsetAtPointCB(AtkText *aText,
                    gint aX, gint aY,
                    AtkCoordType aCoords)
 {
   AccessibleWrap* accWrap = GetAccessibleWrap(ATK_OBJECT(aText));
   if (!accWrap)
     return -1;
   HyperTextAccessible* text = accWrap->AsHyperText();
   if (!text || !text->IsTextRole())
     return -1;
   return static_cast<gint>(
     text->OffsetAtPoint(aX, aY,
                         (aCoords == ATK_XY_SCREEN ?
                          nsIAccessibleCoordinateType::COORDTYPE_SCREEN_RELATIVE :
                          nsIAccessibleCoordinateType::COORDTYPE_WINDOW_RELATIVE)));
 }
 static gint
 getTextSelectionCountCB(AtkText *aText)
 {
   AccessibleWrap* accWrap = GetAccessibleWrap(ATK_OBJECT(aText));
   if (!accWrap)
     return 0;
   HyperTextAccessible* text = accWrap->AsHyperText();
   if (!text || !text->IsTextRole())
     return 0;
   return text->SelectionCount();
 }
 static gchar*
 getTextSelectionCB(AtkText *aText, gint aSelectionNum,
                    gint *aStartOffset, gint *aEndOffset)
 {
   AccessibleWrap* accWrap = GetAccessibleWrap(ATK_OBJECT(aText));
   if (!accWrap)
     return nullptr;
   HyperTextAccessible* text = accWrap->AsHyperText();
   if (!text || !text->IsTextRole())
     return nullptr;
   int32_t startOffset = 0, endOffset = 0;
   text->SelectionBoundsAt(aSelectionNum, &startOffset, &endOffset);
     *aStartOffset = startOffset;
     *aEndOffset = endOffset;
     return getTextCB(aText, *aStartOffset, *aEndOffset);
 }
 // set methods
 static gboolean
 addTextSelectionCB(AtkText *aText,
                    gint aStartOffset,
                    gint aEndOffset)
 {
   AccessibleWrap* accWrap = GetAccessibleWrap(ATK_OBJECT(aText));
   if (!accWrap)
     return FALSE;
   HyperTextAccessible* text = accWrap->AsHyperText();
   if (!text || !text->IsTextRole())
     return FALSE;
   return text->AddToSelection(aStartOffset, aEndOffset);
 }
 static gboolean
 removeTextSelectionCB(AtkText *aText,
                       gint aSelectionNum)
 {
   AccessibleWrap* accWrap = GetAccessibleWrap(ATK_OBJECT(aText));
   if (!accWrap)
     return FALSE;
   HyperTextAccessible* text = accWrap->AsHyperText();
   if (!text || !text->IsTextRole())
     return FALSE;
   return text->RemoveFromSelection(aSelectionNum);
 }
 static gboolean
 setTextSelectionCB(AtkText *aText, gint aSelectionNum,
                    gint aStartOffset, gint aEndOffset)
 {
   AccessibleWrap* accWrap = GetAccessibleWrap(ATK_OBJECT(aText));
   if (!accWrap)
     return FALSE;
   HyperTextAccessible* text = accWrap->AsHyperText();
   if (!text || !text->IsTextRole())
     return FALSE;
   return text->SetSelectionBoundsAt(aSelectionNum, aStartOffset, aEndOffset);
 }
 static gboolean
 setCaretOffsetCB(AtkText *aText, gint aOffset)
 {
   AccessibleWrap* accWrap = GetAccessibleWrap(ATK_OBJECT(aText));
   if (!accWrap)
     return FALSE;
   HyperTextAccessible* text = accWrap->AsHyperText();
   if (!text || !text->IsTextRole() || !text->IsValidOffset(aOffset))
     return FALSE;
   text->SetCaretOffset(aOffset);
   return TRUE;
 }
 }
 void
 textInterfaceInitCB(AtkTextIface* aIface)
 {
   NS_ASSERTION(aIface, "Invalid aIface");
   if (MOZ_UNLIKELY(!aIface))
     return;
   aIface->get_text = getTextCB;
   aIface->get_text_after_offset = getTextAfterOffsetCB;
   aIface->get_text_at_offset = getTextAtOffsetCB;
   aIface->get_character_at_offset = getCharacterAtOffsetCB;
   aIface->get_text_before_offset = getTextBeforeOffsetCB;
   aIface->get_caret_offset = getCaretOffsetCB;
   aIface->get_run_attributes = getRunAttributesCB;
   aIface->get_default_attributes = getDefaultAttributesCB;
   aIface->get_character_extents = getCharacterExtentsCB;
   aIface->get_range_extents = getRangeExtentsCB;
   aIface->get_character_count = getCharacterCountCB;
   aIface->get_offset_at_point = getOffsetAtPointCB;
   aIface->get_n_selections = getTextSelectionCountCB;
   aIface->get_selection = getTextSelectionCB;
     // set methods
   aIface->add_selection = addTextSelectionCB;
   aIface->remove_selection = removeTextSelectionCB;
   aIface->set_selection = setTextSelectionCB;
   aIface->set_caret_offset = setCaretOffsetCB;
   // Cache the string values of the atk text attribute names.
   for (uint32_t i = 0; i < ArrayLength(sAtkTextAttrNames); i++)
     sAtkTextAttrNames[i] =
       atk_text_attribute_get_name(static_cast<AtkTextAttribute>(i));
 }

The Tor Browser / annotate

accessible/src/atk/nsMaiInterfaceText.cpp@97036ab72558 (annotated)

accessible/src/atk/nsMaiInterfaceText.cpp