Fixed multiline expressions, and removed some dead code.

IOHandlerLinesUpdated() does nothing, and IOHandlerIsInputComplete should be
implemented but isn't.  This means that multiline expressions don't work.  This
patch fixes that.  Test case to follow in the next commit.

llvm-svn: 268970
diff --git a/lldb/source/Commands/CommandObjectExpression.cpp b/lldb/source/Commands/CommandObjectExpression.cpp
index 431b3d4..ff350a5 100644
--- a/lldb/source/Commands/CommandObjectExpression.cpp
+++ b/lldb/source/Commands/CommandObjectExpression.cpp
@@ -451,28 +451,21 @@
         error_sp->Flush();
 }
 
-LineStatus
-CommandObjectExpression::IOHandlerLinesUpdated (IOHandler &io_handler,
-                                                StringList &lines,
-                                                uint32_t line_idx,
-                                                Error &error)
+bool
+CommandObjectExpression::IOHandlerIsInputComplete (IOHandler &io_handler,
+                                                   StringList &lines)
 {
-    if (line_idx == UINT32_MAX)
+    // An empty lines is used to indicate the end of input
+    const size_t num_lines = lines.GetSize();
+    if (num_lines > 0 && lines[num_lines - 1].empty())
     {
-        // Remove the last line from "lines" so it doesn't appear
-        // in our final expression
+        // Remove the last empty line from "lines" so it doesn't appear
+        // in our resulting input and return true to indicate we are done
+        // getting lines
         lines.PopBack();
-        error.Clear();
-        return LineStatus::Done;
+        return true;
     }
-    else if (line_idx + 1 == lines.GetSize())
-    {
-        // The last line was edited, if this line is empty, then we are done
-        // getting our multiple lines.
-        if (lines[line_idx].empty())
-            return LineStatus::Done;
-    }
-    return LineStatus::Success;
+    return false;
 }
 
 void
diff --git a/lldb/source/Commands/CommandObjectExpression.h b/lldb/source/Commands/CommandObjectExpression.h
index f26ee7a..312e9fe6 100644
--- a/lldb/source/Commands/CommandObjectExpression.h
+++ b/lldb/source/Commands/CommandObjectExpression.h
@@ -82,12 +82,11 @@
     void
     IOHandlerInputComplete(IOHandler &io_handler,
 			   std::string &line) override;
-
-    virtual LineStatus
-    IOHandlerLinesUpdated (IOHandler &io_handler,
-                           StringList &lines,
-                           uint32_t line_idx,
-                           Error &error);
+    
+    bool
+    IOHandlerIsInputComplete (IOHandler &io_handler,
+                              StringList &lines) override;
+    
     bool
     DoExecute(const char *command,
 	      CommandReturnObject &result) override;