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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);
}
}
}];
}
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