Added support for dumping AST to console, text file or dot file

compiler/java/com/google/dart/compiler/ast/viz/ConsoleWriter.java

Index: compiler/java/com/google/dart/compiler/ast/viz/ConsoleWriter.java
===================================================================
--- compiler/java/com/google/dart/compiler/ast/viz/ConsoleWriter.java	(revision 0)
+++ compiler/java/com/google/dart/compiler/ast/viz/ConsoleWriter.java	(revision 0)
@@ -0,0 +1,78 @@
+// Copyright (c) 2011, the Dart project authors. Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+package com.google.dart.compiler.ast.viz;
+
+import java.io.IOException;
+import java.io.OutputStreamWriter;
+import java.util.HashMap;
+import java.util.Map;
+
+import com.google.common.io.Closeables;
+import com.google.dart.compiler.ast.DartNode;
+import com.google.dart.compiler.ast.DartUnit;
+
+/**
+ * Write the AST in to System out.
+ */
+public class ConsoleWriter extends BaseASTWriter {
+  Map<DartNode, Integer> indentMap;
+  OutputStreamWriter out;
+
+  public ConsoleWriter(String outputDir) {
+    super(outputDir);
+    this.indentMap = new HashMap<DartNode, Integer>();
+    out = new OutputStreamWriter(System.out);
+  }
+
+  @Override
+  protected void startHook(DartUnit unit) {
+    // Do nothing  
+  }
+
+  @Override
+  protected void endHook(DartUnit unit) {
+    try {
+      Closeables.close(out, true);
+    } catch (IOException e) {
+      e.printStackTrace();
+    }
+  }
+
+  protected void write(String nodeType, DartNode node, String data) {
+    StringBuffer sb = new StringBuffer();
+    int indent = 0;
+    DartNode parent = node.getParent();
+    if (parent != null) {
+      indent = this.indentMap.get(parent) + 1;
+    }
+    for (int i = 0; i < indent; i++) {
+      sb.append('\t');
+    }
+    try {
+      out.write(sb.toString());
+      out.write(nodeType);
+      if (!data.equals("")) {
+        out.write(" (" + data + ")");
+      }
+      out.write('\n');
+    } catch (IOException e) {
+
+    }
+  }
+
+  @Override
+  protected void visitChildren(DartNode node) {
+    // Setup Indentation
+    DartNode parent = node.getParent();
+    if (parent == null) { // DartUnit's parent is null
+      this.indentMap.put(node, 0);
+    } else {
+      int parentIndent = this.indentMap.get(parent);
+      this.indentMap.put(node, parentIndent + 1);
+    }
+    super.visitChildren(node);
+  }
+
+}