1 files changed, 116 insertions, 0 deletions
diff --git a/src/ng/log.js b/src/ng/log.js
new file mode 100644
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+++ b/src/ng/log.js
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+'use strict';
+
+/**
+ * @ngdoc object
+ * @name angular.module.ng.$log
+ * @requires $window
+ *
+ * @description
+ * Simple service for logging. Default implementation writes the message
+ * into the browser's console (if present).
+ *
+ * The main purpose of this service is to simplify debugging and troubleshooting.
+ *
+ * @example
+    <doc:example>
+      <doc:source>
+         <script>
+           function LogCtrl($log) {
+             this.$log = $log;
+             this.message = 'Hello World!';
+           }
+         </script>
+         <div ng-controller="LogCtrl">
+           <p>Reload this page with open console, enter text and hit the log button...</p>
+           Message:
+           <input type="text" ng-model="message"/>
+           <button ng-click="$log.log(message)">log</button>
+           <button ng-click="$log.warn(message)">warn</button>
+           <button ng-click="$log.info(message)">info</button>
+           <button ng-click="$log.error(message)">error</button>
+         </div>
+      </doc:source>
+      <doc:scenario>
+      </doc:scenario>
+    </doc:example>
+ */
+
+function $LogProvider(){
+  this.$get = ['$window', function($window){
+    return {
+      /**
+       * @ngdoc method
+       * @name angular.module.ng.$log#log
+       * @methodOf angular.module.ng.$log
+       *
+       * @description
+       * Write a log message
+       */
+      log: consoleLog('log'),
+
+      /**
+       * @ngdoc method
+       * @name angular.module.ng.$log#warn
+       * @methodOf angular.module.ng.$log
+       *
+       * @description
+       * Write a warning message
+       */
+      warn: consoleLog('warn'),
+
+      /**
+       * @ngdoc method
+       * @name angular.module.ng.$log#info
+       * @methodOf angular.module.ng.$log
+       *
+       * @description
+       * Write an information message
+       */
+      info: consoleLog('info'),
+
+      /**
+       * @ngdoc method
+       * @name angular.module.ng.$log#error
+       * @methodOf angular.module.ng.$log
+       *
+       * @description
+       * Write an error message
+       */
+      error: consoleLog('error')
+    };
+
+    function formatError(arg) {
+      if (arg instanceof Error) {
+        if (arg.stack) {
+          arg = (arg.message && arg.stack.indexOf(arg.message) === -1)
+              ? 'Error: ' + arg.message + '\n' + arg.stack
+              : arg.stack;
+        } else if (arg.sourceURL) {
+          arg = arg.message + '\n' + arg.sourceURL + ':' + arg.line;
+        }
+      }
+      return arg;
+    }
+
+    function consoleLog(type) {
+      var console = $window.console || {},
+          logFn = console[type] || console.log || noop;
+
+      if (logFn.apply) {
+        return function() {
+          var args = [];
+          forEach(arguments, function(arg) {
+            args.push(formatError(arg));
+          });
+          return logFn.apply(console, args);
+        };
+      }
+
+      // we are IE which either doesn't have window.console => this is noop and we do nothing,
+      // or we are IE where console.log doesn't have apply so we log at least first 2 args
+      return function(arg1, arg2) {
+        logFn(arg1, arg2);
+      }
+    }
+  }];
+}