[Intl] Cleanup some code

pkg/intl/lib/extract_messages.dart

Index: pkg/intl/lib/extract_messages.dart
diff --git a/pkg/intl/lib/extract_messages.dart b/pkg/intl/lib/extract_messages.dart
index 66b2258b2287bd9f16bea293601f93801298f868..1495b6ae40fe4b7a90c1b932d52dc1644372eac7 100644
--- a/pkg/intl/lib/extract_messages.dart
+++ b/pkg/intl/lib/extract_messages.dart
@@ -112,9 +112,7 @@ class MessageFindingVisitor extends GeneralizingASTVisitor {
     const validNames = const ["message", "plural", "gender", "select"];
     if (!validNames.contains(node.methodName.name)) return false;
     if (!(node.target is SimpleIdentifier)) return false;
-    SimpleIdentifier target = node.target;
-    if (target.token.toString() != "Intl") return false;
-    return true;
+    return node.target.token.toString() == "Intl";
   }
 
   Message _expectedInstance(String type) {
@@ -175,7 +173,7 @@ class MessageFindingVisitor extends GeneralizingASTVisitor {
    */
   void visitMethodInvocation(MethodInvocation node) {
     if (!addIntlMessage(node)) {
-      return super.visitMethodInvocation(node);
+      super.visitMethodInvocation(node);
     }
   }
 
@@ -190,10 +188,9 @@ class MessageFindingVisitor extends GeneralizingASTVisitor {
     var reason = checkValidity(node);
     if (reason != null) {
       if (!suppressWarnings) {
-        var err = new StringBuffer();
-        err.write("Skipping invalid Intl.message invocation\n    <$node>\n");
-        err.write("    reason: $reason\n");
-        err.write(_reportErrorLocation(node));
+        var err = new StringBuffer()
+            ..write("Skipping invalid Intl.message invocation\n    <$node>\n")
+            ..writeAll(["    reason: $reason\n", _reportErrorLocation(node)]);
         warnings.add(err.toString());
         print(err);
       }
@@ -252,10 +249,9 @@ class MessageFindingVisitor extends GeneralizingASTVisitor {
         message.messagePieces.addAll(interpolation.pieces);
       } on IntlMessageExtractionException catch (e) {
         message = null;
-        var err = new StringBuffer();
-        err.write("Error $e\n");
-        err.write("Processing <$node>\n");
-        err.write(_reportErrorLocation(node));
+        var err = new StringBuffer()
+            ..writeAll(["Error ", e, "\nProcessing <", node, ">\n"])
+            ..write(_reportErrorLocation(node));
         print(err);
         warnings.add(err);
       }
@@ -304,7 +300,7 @@ class MessageFindingVisitor extends GeneralizingASTVisitor {
  * special-purpose visitor.
  */
 class InterpolationVisitor extends SimpleASTVisitor {
-  Message message;
+  final Message message;
 
   InterpolationVisitor(this.message);
 
@@ -373,7 +369,7 @@ class PluralAndGenderVisitor extends SimpleASTVisitor {
    * A plural or gender always exists in the context of a parent message,
    * which could in turn also be a plural or gender.
    */
-  ComplexMessage parent;
+  final ComplexMessage parent;
 
   /**
    * The pieces of the message. We are given an initial version of this
@@ -381,11 +377,11 @@ class PluralAndGenderVisitor extends SimpleASTVisitor {
    */
   List pieces;
 
-  PluralAndGenderVisitor(this.pieces, this.parent) : super() {}
-
   /** This will be set to true if we find a plural or gender. */
   bool foundPluralOrGender = false;
 
+  PluralAndGenderVisitor(this.pieces, this.parent) : super();
+
   visitInterpolationExpression(InterpolationExpression node) {
     // TODO(alanknight): Provide better errors for malformed expressions.
     if (!looksLikePluralOrGender(node.expression)) return;
@@ -408,9 +404,7 @@ class PluralAndGenderVisitor extends SimpleASTVisitor {
       return false;
     }
     if (!(node.target is SimpleIdentifier)) return false;
-    SimpleIdentifier target = node.target;
-    if (target.token.toString() != "Intl") return false;
-    return true;
+    return node.target.token.toString() == "Intl";
   }
 
   /**
@@ -423,7 +417,7 @@ class PluralAndGenderVisitor extends SimpleASTVisitor {
 
   /**
    * Create a MainMessage from [node] using the name and
-   * parameters of the last function/method declaration we encountered
+   * parameters of the last function/method declaration we encountered            e
    * and the parameters to the Intl.message call.
    */
   Message messageFromMethodInvocation(MethodInvocation node) {
@@ -445,10 +439,9 @@ class PluralAndGenderVisitor extends SimpleASTVisitor {
         message[key] = interpolation.pieces;
       } on IntlMessageExtractionException catch (e) {
         message = null;
-        var err = new StringBuffer();
-        err.write("Error $e");
-        err.write("Processing <$node>");
-        err.write(_reportErrorLocation(node));
+        var err = new StringBuffer()
+            ..writeAll(["Error ", $e, "\nProcessing <", node, ">"])
+            ..write(_reportErrorLocation(node));
         print(err);
         warnings.add(err);
       }
@@ -479,4 +472,4 @@ class IntlMessageExtractionException implements Exception {
   const IntlMessageExtractionException([this.message = ""]);
 
   String toString() => "IntlMessageExtractionException: $message";
-}
+}