simplify AST (idea like)

src/com/google/dart/compiler/backend/js/JsToStringGenerationVisitor.java

@@ -388,12 +388,12 @@ public class JsToStringGenerationVisitor extends JsVisitor {
     }
 
     @Override
-    public void visitDebugger(JsDebugger x, JsContext ctx) {
+    public void visitDebugger(JsDebugger x, JsContext context) {
         p.print(CHARS_DEBUGGER);
     }
 
     @Override
-    public void visitDefault(JsDefault x, JsContext ctx) {
+    public void visitDefault(JsDefault x, JsContext context) {
         p.print(CHARS_DEFAULT);
         _colon();
 
@@ -413,7 +413,7 @@ public class JsToStringGenerationVisitor extends JsVisitor {
     }
 
     @Override
-    public void visitDoWhile(JsDoWhile x, JsContext ctx) {
+    public void visitDoWhile(JsDoWhile x, JsContext context) {
         p.print(CHARS_DO);
         _nestedPush(x.getBody());
         accept(x.getBody());
@@ -499,23 +499,23 @@ public class JsToStringGenerationVisitor extends JsVisitor {
             space();
             nameDef(x.getIterVarName());
 
-            if (x.getIterExpr() != null) {
+            if (x.getIterExpression() != null) {
                 spaceOpt();
                 assignment();
                 spaceOpt();
-                accept(x.getIterExpr());
+                accept(x.getIterExpression());
             }
         }
         else {
             // Just a name ref.
             //
-            accept(x.getIterExpr());
+            accept(x.getIterExpression());
         }
 
         space();
         p.print(CHARS_IN);
         space();
-        accept(x.getObjExpr());
+        accept(x.getObjectExpression());
 
         rightParen();
         _nestedPush(x.getBody());
@@ -734,7 +734,7 @@ public class JsToStringGenerationVisitor extends JsVisitor {
     }
 
     @Override
-    public void visitProgram(JsProgram x, JsContext ctx) {
+    public void visitProgram(JsProgram x, JsContext context) {
         p.print("<JsProgram>");
     }
 

src/com/google/dart/compiler/backend/js/ast/JsForIn.java

@@ -9,8 +9,8 @@ package com.google.dart.compiler.backend.js.ast;
  */
 public class JsForIn extends JsNodeImpl implements JsStatement {
     private JsStatement body;
-    private JsExpression iterExpr;
-    private JsExpression objExpr;
+    private JsExpression iterExpression;
+    private JsExpression objectExpression;
 
     // Optional: the name of a new iterator variable to introduce
     private final JsName iterVarName;
@@ -27,28 +27,28 @@ public class JsForIn extends JsNodeImpl implements JsStatement {
         return body;
     }
 
-    public JsExpression getIterExpr() {
-        return iterExpr;
+    public JsExpression getIterExpression() {
+        return iterExpression;
     }
 
     public JsName getIterVarName() {
         return iterVarName;
     }
 
-    public JsExpression getObjExpr() {
-        return objExpr;
+    public JsExpression getObjectExpression() {
+        return objectExpression;
     }
 
     public void setBody(JsStatement body) {
         this.body = body;
     }
 
-    public void setIterExpr(JsExpression iterExpr) {
-        this.iterExpr = iterExpr;
+    public void setIterExpression(JsExpression iterExpression) {
+        this.iterExpression = iterExpression;
     }
 
-    public void setObjExpr(JsExpression objExpr) {
-        this.objExpr = objExpr;
+    public void setObjectExpression(JsExpression objectExpression) {
+        this.objectExpression = objectExpression;
     }
 
     @Override
@@ -58,10 +58,10 @@ public class JsForIn extends JsNodeImpl implements JsStatement {
 
     @Override
     public void acceptChildren(JsVisitor visitor, JsContext context) {
-        if (iterExpr != null) {
-            iterExpr = visitor.acceptLvalue(iterExpr);
+        if (iterExpression != null) {
+            iterExpression = visitor.acceptLvalue(iterExpression);
         }
-        objExpr = visitor.accept(objExpr);
+        objectExpression = visitor.accept(objectExpression);
         body = visitor.accept(body);
     }
 

src/com/google/dart/compiler/backend/js/ast/JsNode.java

@@ -4,7 +4,9 @@
 
 package com.google.dart.compiler.backend.js.ast;
 
-public interface JsNode {
+import com.google.dart.compiler.common.HasSourceInfo;
+
+public interface JsNode extends HasSourceInfo {
     NodeKind getKind();
 
     /**

src/com/google/dart/compiler/backend/js/ast/JsVisitor.java

@@ -145,16 +145,16 @@ public abstract class JsVisitor {
         visitElement(x, ctx);
     }
 
-    public void visitDebugger(JsDebugger x, JsContext ctx) {
-        visitElement(x, ctx);
+    public void visitDebugger(JsDebugger x, JsContext context) {
+        visitElement(x, context);
     }
 
-    public void visitDefault(JsDefault x, JsContext ctx) {
-        visitElement(x, ctx);
+    public void visitDefault(JsDefault x, JsContext context) {
+        visitElement(x, context);
     }
 
-    public void visitDoWhile(JsDoWhile x, JsContext ctx) {
-        visitElement(x, ctx);
+    public void visitDoWhile(JsDoWhile x, JsContext context) {
+        visitElement(x, context);
     }
 
     public void visitEmpty(JsEmpty x, JsContext ctx) {