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 +1,91 @@
+// 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.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() {
+    // Do nothing  
+  }
+  
+  @Override
+  protected void endHook() {

[zundel, 2011/11/15 14:49:54]

Guava has a shortcut for closing streams like this:

Closeables.close(out, true);

[shauvik, 2011/11/15 23:53:14]

Cool!
On 2011/11/15 14:49:54, zundel wrote:

[shauvik, 2011/11/15 23:53:14]

Done.

+    try {
+      out.flush();
+      out.close();
+    } catch (IOException e) {
+      System.err.println("Error flushing AST output stream");
+      e.printStackTrace();
+    }
+  }
+
+  public void write(String nodeType, DartNode node){
+    write(nodeType, node, "");
+  }
+  
+  public 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(TAB);
+    }
+    try{
+      out.write(sb.toString());
+      out.write(nodeType);
+      if(!data.equals("")){
+        out.write(" ("+data+")");

[zundel, 2011/11/15 14:49:54]

style: spaces before and after +

[shauvik, 2011/11/15 23:53:14]

Done.

+      }
+      out.write('\n');
+    }catch (IOException e) {
+      
+    }
+  }
+  
+  @Override
+  public void visitChildren(DartNode node) {
+    //Setup Indentation

[zundel, 2011/11/15 14:49:54]

style: space after //

[shauvik, 2011/11/15 23:53:14]

Done.

+    DartNode parent = node.getParent();
+    if(parent == null){ //DartUnit's parent is null
+      this.indentMap.put(node, 0);
+    }else{

[zundel, 2011/11/15 14:49:54]

style: } else {

[shauvik, 2011/11/15 23:53:14]

Done.

+      int parentIndent = this.indentMap.get(parent);
+      this.indentMap.put(node, parentIndent+1);
+    }
+
+    node.visitChildren(this);
+  }
+  
+  @Override
+  public Object visitUnit(DartUnit node) {
+    if(!isIgnored(node)){
+      visitChildren(node);
+    }
+    return null;
+  }
+}