Whitespace testing fixes and bit-flip to turn on simple line breaking.

pkg/analyzer/lib/src/services/writer.dart

Index: pkg/analyzer/lib/src/services/writer.dart
===================================================================
--- pkg/analyzer/lib/src/services/writer.dart	(revision 31766)
+++ pkg/analyzer/lib/src/services/writer.dart	(working copy)
@@ -116,7 +116,7 @@
         if (work.fits(tok)) {
           work.add(tok);
         } else {
-          if (!isWhitespace(work)) {
+          if (!isAllWhitespace(work)) {
             current.add(work);
           }
           if (current.length > 0) {
@@ -137,10 +137,7 @@
     return chunks;
   }
 
-  bool isWhitespace(Chunk chunk) {
-    var str = chunk.buffer.toString();
-    return str.lastIndexOf(new RegExp(r"(\w+)")) == str.length - 1;
-  }
+  bool isAllWhitespace(Chunk chunk) => isWhitespace(chunk.buffer.toString());
 
   /// Test whether this token is a good start for a new working chunk
   bool goodStart(LineToken tok, Chunk workingChunk) =>
@@ -148,6 +145,9 @@
 
 }
 
+/// Test if this [string] contains only whitespace characters
+bool isWhitespace(String string) => string.codeUnits.every(
+      (c) => c == 0x09 || c == 0x20 || c == 0x0A || c == 0x0D);
 
 /// Special token indicating a line start
 final LINE_START = new SpaceToken(0);
@@ -256,9 +256,9 @@
 
   SourceWriter({this.indentCount: 0, this.lineSeparator: NEW_LINE,
       bool useTabs: false, int spacesPerIndent: 2, int maxLineLength: 80}) {
-//    linePrinter = new SimpleLineBreaker(maxLineLength, (n) =>
-//        getIndentString(n, useTabs: useTabs, spacesPerIndent: spacesPerIndent));
-    linePrinter = new SimpleLinePrinter();
+    linePrinter = new SimpleLineBreaker(maxLineLength, (n) =>
+        getIndentString(n, useTabs: useTabs, spacesPerIndent: spacesPerIndent));
+//    linePrinter = new SimpleLinePrinter();
     currentLine = new Line(indent: indentCount, printer: linePrinter);
   }