add transformation logger

src/babel/transformation/file.js

@@ -7,6 +7,7 @@ import generate from "../generation";
 import defaults from "lodash/object/defaults";
 import includes from "lodash/collection/includes";
 import assign from "lodash/object/assign";
+import Logger from "./logger";
 import parse from "../helpers/parse";
 import Scope from "../traversal/scope";
 import slash from "slash";
@@ -23,7 +24,7 @@ var checkTransformerVisitor = {
 
 function checkNode(stack, node, scope) {
   each(stack, function (pass) {
-    if (pass.shouldRun) return;
+    if (pass.shouldRun || pass.ran) return;
     pass.checkNode(node, scope);
   });
 }
@@ -41,6 +42,7 @@ export default class File {
 
     this.lastStatements = [];
     this.opts           = this.normalizeOptions(opts);
+    this.log            = new Logger(this);
     this.ast            = {};
 
     this.buildTransformers();
@@ -260,12 +262,6 @@ export default class File {
     this.transformers = transformers;
   }
 
-  debug(msg?: string) {
-    var parts = this.opts.filename;
-    if (msg) parts += `: ${msg}`;
-    util.debug(parts);
-  }
-
   getModuleFormatter(type: string) {
     var ModuleFormatter = isFunction(type) ? type : transform.moduleFormatters[type];
 
@@ -398,10 +394,6 @@ export default class File {
     }
   }
 
-  logDeopt() {
-    // todo, (node, msg)
-  }
-
   errorWithNode(node, msg, Error = SyntaxError) {
     var loc = node.loc.start;
     var err = new Error(`Line ${loc.line}: ${msg}`);

src/babel/transformation/logger.js

@@ -0,0 +1,22 @@
+import * as util from  "../util";
+
+export default class Logger {
+  constructor(file: File) {
+    this.filename = file.opts.filename;
+    this.file     = file;
+  }
+
+  _buildMessage(msg: string): string {
+    var parts = this.filename;
+    if (msg) parts += `: ${msg}`;
+    return parts;
+  }
+
+  debug(msg: string) {
+    util.debug(this._buildMessage(msg));
+  }
+
+  deopt(node: Object, msg: string) {
+    util.debug(this._buildMessage(msg));
+  }
+}

src/babel/transformation/transformer-pass.js

@@ -11,6 +11,7 @@ export default class TransformerPass {
     this.shouldRun   = !transformer.check;
     this.handlers    = transformer.handlers;
     this.file        = file;
+    this.ran         = false;
   }
 
   canRun(): boolean {
@@ -56,8 +57,10 @@ export default class TransformerPass {
 
     var file = this.file;
 
-    file.debug(`Running transformer ${this.transformer.key}`);
+    file.log.debug(`Running transformer ${this.transformer.key}`);
 
     file.scope.traverse(file.ast, this.handlers, file);
+
+    this.ran = true;
   }
 }

src/babel/transformation/transformers/es6/tail-call.js

@@ -161,7 +161,7 @@ class TailCallTransformer {
     if (!this.hasTailRecursion) return;
 
     if (this.hasDeopt()) {
-      this.file.logDeopt(node, messages.get("tailCallReassignmentDeopt"));
+      this.file.log.deopt(node, messages.get("tailCallReassignmentDeopt"));
       return;
     }