From 1de330b786afa0108b4863efb5a367d477314cf1 Mon Sep 17 00:00:00 2001
From: Boris Zbarsky <bzbarsky@mit.edu>
Date: Thu, 9 Apr 2009 11:58:40 -0400
Subject: [PATCH] Backed out changeset 3c687f3d4ff4 (bug 482971) on suspicion
 of causing intermittent leak orange.

---
 layout/style/nsCSSScanner.cpp | 99 ++++++++++++++++++++++++++++++-----
 layout/style/nsCSSScanner.h   |  9 +++-
 2 files changed, 92 insertions(+), 16 deletions(-)

diff --git a/layout/style/nsCSSScanner.cpp b/layout/style/nsCSSScanner.cpp
index f4ab452b0d0..0c516478423 100644
--- a/layout/style/nsCSSScanner.cpp
+++ b/layout/style/nsCSSScanner.cpp
@@ -669,19 +669,39 @@ nsCSSScanner::LookAhead(PRUnichar aChar)
   return PR_FALSE;
 }
 
-void
+PRBool
 nsCSSScanner::EatWhiteSpace()
 {
+  PRBool eaten = PR_FALSE;
   for (;;) {
     PRInt32 ch = Read();
     if (ch < 0) {
       break;
     }
-    if ((ch != ' ') && (ch != '\n') && (ch != '\t')) {
-      Pushback(ch);
-      break;
+    if ((ch == ' ') || (ch == '\n') || (ch == '\t')) {
+      eaten = PR_TRUE;
+      continue;
     }
+    Pushback(ch);
+    break;
   }
+  return eaten;
+}
+
+PRBool
+nsCSSScanner::EatNewline()
+{
+  PRInt32 ch = Read();
+  if (ch < 0) {
+    return PR_FALSE;
+  }
+  PRBool eaten = PR_FALSE;
+  if (ch == '\n') {
+    eaten = PR_TRUE;
+  } else {
+    Pushback(ch);
+  }
+  return eaten;
 }
 
 PRBool
@@ -740,7 +760,7 @@ nsCSSScanner::Next(nsCSSToken& aToken)
     if (IsWhitespace(ch)) {
       aToken.mType = eCSSToken_WhiteSpace;
       aToken.mIdent.Assign(PRUnichar(ch));
-      EatWhiteSpace();
+      (void) EatWhiteSpace();
       return PR_TRUE;
     }
     if (ch == '/') {
@@ -835,7 +855,7 @@ nsCSSScanner::NextURL(nsCSSToken& aToken)
   if (IsWhitespace(ch)) {
     aToken.mType = eCSSToken_WhiteSpace;
     aToken.mIdent.Assign(PRUnichar(ch));
-    EatWhiteSpace();
+    (void) EatWhiteSpace();
     return PR_TRUE;
   }
 
@@ -870,7 +890,7 @@ nsCSSScanner::NextURL(nsCSSToken& aToken)
         ok = PR_FALSE;
       } else if (IsWhitespace(ch)) {
         // Whitespace is allowed at the end of the URL
-        EatWhiteSpace();
+        (void) EatWhiteSpace();
         if (LookAhead(')')) {
           Pushback(')');  // leave the closing symbol
           // done!
@@ -959,13 +979,17 @@ nsCSSScanner::ParseAndAppendEscape(nsString& aOutput)
         Pushback(ch);
     }
     return;
-  } 
-  // "Any character except a hexidecimal digit can be escaped to
-  // remove its special meaning by putting a backslash in front"
-  // -- CSS1 spec section 7.1
-  ch = Read();  // Consume the escaped character
-  if ((ch > 0) && (ch != '\n')) {
-    aOutput.Append(ch);
+  } else {
+    // "Any character except a hexidecimal digit can be escaped to
+    // remove its special meaning by putting a backslash in front"
+    // -- CSS1 spec section 7.1
+    if (!EatNewline()) { // skip escaped newline
+      (void) Read();
+      if (ch > 0) {
+        aOutput.Append(ch);
+      }
+    }
+    return;
   }
 }
 
@@ -1169,6 +1193,53 @@ nsCSSScanner::SkipCComment()
   return PR_FALSE;
 }
 
+#if 0
+PRBool
+nsCSSScanner::ParseCComment(nsCSSToken& aToken)
+{
+  nsString& ident = aToken.mIdent;
+  for (;;) {
+    PRInt32 ch = Read();
+    if (ch < 0) break;
+    if (ch == '*') {
+      if (LookAhead('/')) {
+        ident.Append(PRUnichar(ch));
+        ident.Append(PRUnichar('/'));
+        break;
+      }
+    }
+#ifdef COLLECT_WHITESPACE
+    ident.Append(PRUnichar(ch));
+#endif
+  }
+  aToken.mType = eCSSToken_WhiteSpace;
+  return PR_TRUE;
+}
+#endif
+
+#if 0
+PRBool
+nsCSSScanner::ParseEOLComment(nsCSSToken& aToken)
+{
+  nsString& ident = aToken.mIdent;
+  ident.SetLength(0);
+  for (;;) {
+    if (EatNewline()) {
+      break;
+    }
+    PRInt32 ch = Read();
+    if (ch < 0) {
+      break;
+    }
+#ifdef COLLECT_WHITESPACE
+    ident.Append(PRUnichar(ch));
+#endif
+  }
+  aToken.mType = eCSSToken_WhiteSpace;
+  return PR_TRUE;
+}
+#endif // 0
+
 PRBool
 nsCSSScanner::ParseString(PRInt32 aStop, nsCSSToken& aToken)
 {
diff --git a/layout/style/nsCSSScanner.h b/layout/style/nsCSSScanner.h
index 733933090d0..70ecb611cc5 100644
--- a/layout/style/nsCSSScanner.h
+++ b/layout/style/nsCSSScanner.h
@@ -211,14 +211,19 @@ protected:
   PRInt32 Read();
   PRInt32 Peek();
   PRBool LookAhead(PRUnichar aChar);
-  void EatWhiteSpace();
-  
+  PRBool EatWhiteSpace();
+  PRBool EatNewline();
+
   void ParseAndAppendEscape(nsString& aOutput);
   PRBool ParseIdent(PRInt32 aChar, nsCSSToken& aResult);
   PRBool ParseAtKeyword(PRInt32 aChar, nsCSSToken& aResult);
   PRBool ParseNumber(PRInt32 aChar, nsCSSToken& aResult);
   PRBool ParseRef(PRInt32 aChar, nsCSSToken& aResult);
   PRBool ParseString(PRInt32 aChar, nsCSSToken& aResult);
+#if 0
+  PRBool ParseCComment(nsCSSToken& aResult);
+  PRBool ParseEOLComment(nsCSSToken& aResult);
+#endif
   PRBool SkipCComment();
 
   PRBool GatherIdent(PRInt32 aChar, nsString& aIdent);