1 /*
   2  * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions
   6  * are met:
   7  *
   8  *   - Redistributions of source code must retain the above copyright
   9  *     notice, this list of conditions and the following disclaimer.
  10  *
  11  *   - Redistributions in binary form must reproduce the above copyright
  12  *     notice, this list of conditions and the following disclaimer in the
  13  *     documentation and/or other materials provided with the distribution.
  14  *
  15  *   - Neither the name of Oracle nor the names of its
  16  *     contributors may be used to endorse or promote products derived
  17  *     from this software without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
  20  * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  21  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
  23  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  24  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  25  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  26  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  27  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  28  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  29  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  30  */
  31 
  32 /**
  33  * Simple Web Console-like support for Nashorn. In addition to
  34  * Web console object methods, this console add methods of
  35  * java.io.Console as well. Note:not all web console methods are 
  36  * implemented but useful subset is implemented.
  37  *
  38  * See also: https://developer.mozilla.org/en/docs/Web/API/console
  39  */
  40 
  41 
  42 if (typeof console == 'undefined') {
  43 
  44 (function() {
  45     var LocalDateTime = Java.type("java.time.LocalDateTime");
  46     var System = Java.type("java.lang.System");
  47     var jconsole = System.console();
  48 
  49     // add a new global variable called "console"
  50     this.console = {
  51     };
  52 
  53     function addConsoleMethods() {
  54         // expose methods of java.io.Console as an extension
  55         var placeholder = "-*-";
  56         // put a placeholder for each name from java.lang.Object
  57         var objMethods = Object.bindProperties({}, new java.lang.Object());
  58         for (var m in objMethods) {
  59             console[m] = placeholder;
  60         }
  61 
  62         // bind only the methods of java.io.Console
  63         // This bind will skip java.lang.Object methods as console
  64         // has properties of same name.
  65         Object.bindProperties(console, jconsole);
  66 
  67         // Now, delete java.lang.Object methods
  68         for (var m in console) {
  69             if (console[m] == placeholder) {
  70                 delete console[m];
  71             }
  72         }
  73     }
  74 
  75     addConsoleMethods();
  76 
  77     function consoleLog(type, msg) {
  78         // print type of message, then time.
  79         jconsole.format("%s [%s] ", type, LocalDateTime.now().toString());
  80         if (typeof msg == 'string') {
  81             jconsole.format(msg + "\n", Array.prototype.slice.call(arguments, 2));
  82         } else {
  83             // simple space separated values and newline at the end
  84             var arr = Array.prototype.slice.call(arguments, 1);
  85             jconsole.format("%s\n", arr.join(" "));
  86         }
  87     }
  88 
  89     console.toString = function() "[object Console]";
  90 
  91     // web console functions
  92 
  93     console.assert = function(expr) {
  94         if (! expr) {
  95             arguments[0] = "Assertion Failed:"; 
  96             consoleLog.apply(console, arguments);
  97             // now, stack trace at the end
  98             jconsole.format("%s\n", new Error().stack);
  99         }
 100     };
 101 
 102     // dummy clear to avoid error!
 103     console.clear = function() {};
 104 
 105     var counter = {
 106         get: function(label) {
 107             if (! this[label]) {
 108                 return this[label] = 1;
 109             } else {
 110                 return ++this[label];
 111             }
 112         }
 113     };
 114    
 115     // counter 
 116     console.count = function(label) {
 117         label = label? String(label) : "<no label>";
 118         jconsole.format("%s: %d\n",label, counter.get(label).intValue());
 119     }
 120 
 121     // logging
 122     console.error = consoleLog.bind(jconsole, "ERROR");
 123     console.info = consoleLog.bind(jconsole, "INFO");
 124     console.log = console.info;
 125     console.debug = console.log;
 126     console.warn = consoleLog.bind(jconsole, "WARNING");
 127 
 128     // print stack trace
 129     console.trace = function() {
 130         jconsole.format("%s\n", new Error().stack);
 131     };
 132 })();
 133 
 134 }