Bug 582863 - Spell checker shouldn't copy the text node contents unnecessarily; r=roc a=blocking2.0+

--HG--
extra : rebase_source : 7313d44dfe2645a8df15a4fca78e75ecfc39b536

content/base/src/nsTextFragment.cpp

@@ -42,7 +42,6 @@
  */
 
 #include "nsTextFragment.h"
-#include "nsString.h"
 #include "nsCRT.h"
 #include "nsReadableUtils.h"
 #include "nsMemory.h"
@@ -241,27 +240,6 @@ nsTextFragment::SetTo(const PRUnichar* aBuffer, PRInt32 aLength)
   mState.mLength = aLength;
 }
 
-void
-nsTextFragment::AppendTo(nsAString& aString) const
-{
-  if (mState.mIs2b) {
-    aString.Append(m2b, mState.mLength);
-  } else {
-    AppendASCIItoUTF16(Substring(m1b, m1b + mState.mLength),
-                       aString);
-  }
-}
-
-void
-nsTextFragment::AppendTo(nsAString& aString, PRInt32 aOffset, PRInt32 aLength) const
-{
-  if (mState.mIs2b) {
-    aString.Append(m2b + aOffset, aLength);
-  } else {
-    AppendASCIItoUTF16(Substring(m1b + aOffset, m1b + aOffset + aLength), aString);
-  }
-}
-
 void
 nsTextFragment::CopyTo(PRUnichar *aDest, PRInt32 aOffset, PRInt32 aCount)
 {

content/base/src/nsTextFragment.h

@@ -44,7 +44,7 @@
 #ifndef nsTextFragment_h___
 #define nsTextFragment_h___
 
-#include "nsAString.h"
+#include "nsString.h"
 #include "nsTraceRefcnt.h"
 class nsString;
 class nsCString;
@@ -165,14 +165,27 @@ public:
   /**
    * Append the contents of this string fragment to aString
    */
-  void AppendTo(nsAString& aString) const;
+  void AppendTo(nsAString& aString) const {
+    if (mState.mIs2b) {
+      aString.Append(m2b, mState.mLength);
+    } else {
+      AppendASCIItoUTF16(Substring(m1b, m1b + mState.mLength),
+                         aString);
+    }
+  }
 
   /**
    * Append a substring of the contents of this string fragment to aString.
    * @param aOffset where to start the substring in this text fragment
    * @param aLength the length of the substring
    */
-  void AppendTo(nsAString& aString, PRInt32 aOffset, PRInt32 aLength) const;
+  void AppendTo(nsAString& aString, PRInt32 aOffset, PRInt32 aLength) const {
+    if (mState.mIs2b) {
+      aString.Append(m2b + aOffset, aLength);
+    } else {
+      AppendASCIItoUTF16(Substring(m1b + aOffset, m1b + aOffset + aLength), aString);
+    }
+  }
 
   /**
    * Make a copy of the fragments contents starting at offset for

extensions/spellcheck/src/mozInlineSpellWordUtil.cpp

@@ -51,6 +51,7 @@
 #include "nsUnicharUtilCIID.h"
 #include "nsServiceManagerUtils.h"
 #include "nsIContent.h"
+#include "nsTextFragment.h"
 
 // IsIgnorableCharacter
 //
@@ -429,13 +430,6 @@ IsBRElement(nsIDOMNode* aNode)
   return NS_SUCCEEDED(rv);
 }
 
-static void
-GetNodeText(nsIDOMNode* aNode, nsAutoString& aText)
-{
-  nsresult rv = aNode->GetNodeValue(aText);
-  NS_ASSERTION(NS_SUCCEEDED(rv), "Unable to get node text");
-}
-
 // Find the previous node in the DOM tree in preorder. This isn't fast because
 // one call to GetPrevSibling can be O(N) in the number of siblings...
 static nsIDOMNode*
@@ -480,10 +474,12 @@ ContainsDOMWordSeparator(nsIDOMNode* aNode, PRInt32 aBeforeOffset,
   if (!IsTextNode(aNode))
     return PR_FALSE;
 
-  nsAutoString str;
-  GetNodeText(aNode, str);
-  for (PRInt32 i = NS_MIN(aBeforeOffset, PRInt32(str.Length())) - 1; i >= 0; --i) {
-    if (IsDOMWordSeparator(str.CharAt(i))) {
+  nsCOMPtr<nsIContent> content = do_QueryInterface(aNode);
+  NS_ASSERTION(content, "Where is our content?");
+  const nsTextFragment* textFragment = content->GetText();
+  NS_ASSERTION(textFragment, "Where is our text?");
+  for (PRInt32 i = NS_MIN(aBeforeOffset, PRInt32(textFragment->GetLength())) - 1; i >= 0; --i) {
+    if (IsDOMWordSeparator(textFragment->CharAt(i))) {
       *aSeparatorOffset = i;
       return PR_TRUE;
     }
@@ -584,7 +580,6 @@ mozInlineSpellWordUtil::BuildSoftText()
   PRBool seenSoftEnd = PR_FALSE;
   // Leave this outside the loop so large heap string allocations can be reused
   // across iterations
-  nsAutoString str;
   while (node) {
     if (node == mSoftEnd.mNode) {
       seenSoftEnd = PR_TRUE;
@@ -592,14 +587,17 @@ mozInlineSpellWordUtil::BuildSoftText()
 
     PRBool exit = PR_FALSE;
     if (IsTextNode(node)) {
-      GetNodeText(node, str);
-      PRInt32 lastOffsetInNode = str.Length();
+      nsCOMPtr<nsIContent> content = do_QueryInterface(node);
+      NS_ASSERTION(content, "Where is our content?");
+      const nsTextFragment* textFragment = content->GetText();
+      NS_ASSERTION(textFragment, "Where is our text?");
+      PRInt32 lastOffsetInNode = textFragment->GetLength();
 
       if (seenSoftEnd) {
         // check whether we can stop after this
         for (PRInt32 i = node == mSoftEnd.mNode ? mSoftEnd.mOffset : 0;
-             i < PRInt32(str.Length()); ++i) {
-          if (IsDOMWordSeparator(str.CharAt(i))) {
+             i < PRInt32(textFragment->GetLength()); ++i) {
+          if (IsDOMWordSeparator(textFragment->CharAt(i))) {
             exit = PR_TRUE;
             // stop at the first separator after the soft end point
             lastOffsetInNode = i;
@@ -612,7 +610,7 @@ mozInlineSpellWordUtil::BuildSoftText()
         PRInt32 len = lastOffsetInNode - firstOffsetInNode;
         mSoftTextDOMMapping.AppendElement(
           DOMTextMapping(NodeOffset(node, firstOffsetInNode), mSoftText.Length(), len));
-        mSoftText.Append(Substring(str, firstOffsetInNode, len));
+        textFragment->AppendTo(mSoftText, firstOffsetInNode, len);
       }
       
       firstOffsetInNode = 0;