generator: move BlockStatement to base generator

lib/6to5/generators/base.js

@@ -5,3 +5,15 @@ exports.File = function (node, print) {
 exports.Program = function (node, print) {
   print.sequence(node.body);
 };
+
+exports.BlockStatement = function (node, print) {
+  if (node.body.length === 0) {
+    this.push("{}");
+  } else {
+    this.push("{");
+    this.newline();
+    print.sequence(node.body, { indent: true });
+    this.newline();
+    this.push("}");
+  }
+};

lib/6to5/generators/statements.js

@@ -1,3 +1,4 @@
+var t = require("../types");
 var _ = require("lodash");
 
 exports.WithStatement = function (node, print) {
@@ -13,26 +14,15 @@ exports.IfStatement = function (node, print) {
   this.push("(");
   print(node.test);
   this.push(") ");
-  print(node.consequent);
+
+  var consequent = node.consequent;
+  if (node.alternate) consequent = t.toBlock(consequent);
+  print(consequent);
 
   if (node.alternate) {
     if (this.isLast("}")) this.push(" ");
     this.keyword("else");
-    print(node.alternate);
-  }
-};
-
-exports.BlockStatement = function (node, print) {
-  if (node.body.length === 0) {
-    this.push("{}");
-  } else {
-    this.push("{");
-    this.newline();
-    this.indent();
-    print.sequence(node.body);
-    this.dedent();
-    this.newline();
-    this.push("}");
+    print(t.toBlock(node.alternate));
   }
 };
 
@@ -41,12 +31,19 @@ exports.ForStatement = function (node, print) {
   this.push("(");
 
   print(node.init);
-  this.push("; ");
+  this.push(";");
 
-  print(node.test);
-  this.push("; ");
+  if (node.test) {
+    this.push(" ");
+    print(node.test);
+  }
+  this.push(";");
+
+  if (node.update) {
+    this.push(" ");
+    print(node.update);
+  }
 
-  print(node.update);
   this.push(") ");
 
   print(node.body);
@@ -109,8 +106,7 @@ exports.ContinueStatement = function (node, print) {
 
 exports.LabeledStatement = function (node, print) {
   print(node.label);
-  this.push(":");
-  this.newline();
+  this.push(": ");
   print(node.body);
 };
 
@@ -144,11 +140,13 @@ exports.SwitchStatement = function (node, print) {
   this.push("(");
   print(node.discriminant);
   this.push(") {");
+
   if (node.cases.length > 0) {
     this.newline();
-    this.printJoin(print, node.cases, "\n");
+    print.sequence(node.cases, { indent: true });
     this.newline();
   }
+
   this.push("}");
 };