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+/* The contents of this file are subject to the Netscape Public
+ * License Version 1.1 (the "License"); you may not use this file
+ * except in compliance with the License. You may obtain a copy of
+ * the License at http://www.mozilla.org/NPL/
+ *
+ * Software distributed under the License is distributed on an "AS
+ * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
+ * implied. See the License for the specific language governing
+ * rights and limitations under the License.
+ *
+ * The Original Code is Mozilla Communicator client code, released March
+ * 31, 1998.
+ *
+ * The Initial Developer of the Original Code is Netscape Communications
+ * Corporation. Portions created by Netscape are
+ * Copyright (C) 1998 Netscape Communications Corporation. All
+ * Rights Reserved.
+ *
+ * Contributor(s): 
+ * 
+ */
+/**
+    File Name:          11.6.1-3.js
+    ECMA Section:       11.6.1 The addition operator ( + )
+    Description:
+
+    The addition operator either performs string concatenation or numeric
+    addition.
+
+    The production AdditiveExpression : AdditiveExpression + MultiplicativeExpression
+    is evaluated as follows:
+
+    1.  Evaluate AdditiveExpression.
+    2.  Call GetValue(Result(1)).
+    3.  Evaluate MultiplicativeExpression.
+    4.  Call GetValue(Result(3)).
+    5.  Call ToPrimitive(Result(2)).
+    6.  Call ToPrimitive(Result(4)).
+    7.  If Type(Result(5)) is String or Type(Result(6)) is String, go to step 12.
+        (Note that this step differs from step 3 in the algorithm for comparison
+        for the relational operators in using or instead of and.)
+    8.  Call ToNumber(Result(5)).
+    9.  Call ToNumber(Result(6)).
+    10. Apply the addition operation to Result(8) and Result(9). See the discussion below (11.6.3).
+    11. Return Result(10).
+    12. Call ToString(Result(5)).
+    13. Call ToString(Result(6)).
+    14. Concatenate Result(12) followed by Result(13).
+    15. Return Result(14).
+
+    Note that no hint is provided in the calls to ToPrimitive in steps 5 and 6.
+    All native ECMAScript objects except Date objects handle the absence of a
+    hint as if the hint Number were given; Date objects handle the absence of a
+    hint as if the hint String were given. Host objects may handle the absence
+    of a hint in some other manner.
+
+    This test does only covers cases where the Additive or Mulplicative expression
+    is a Date.
+
+    Author:             christine@netscape.com
+    Date:               12 november 1997
+*/
+    var SECTION = "11.6.1-3";
+    var VERSION = "ECMA_1";
+    startTest();
+    var testcases = getTestCases();
+
+    writeHeaderToLog( SECTION + " The Addition operator ( + )");
+    test();
+
+function test() {
+    for ( tc=0; tc < testcases.length; tc++ ) {
+        testcases[tc].passed = writeTestCaseResult(
+                            testcases[tc].expect,
+                            testcases[tc].actual,
+                            testcases[tc].description +" = "+
+                            testcases[tc].actual );
+
+        testcases[tc].reason += ( testcases[tc].passed ) ? "" : "wrong value ";
+    }
+    stopTest();
+    return ( testcases );
+}
+function getTestCases() {
+    var array = new Array();
+    var item = 0;
+
+    // tests for boolean primitive, boolean object, Object object, a "MyObject" whose value is
+    // a boolean primitive and a boolean object, and "MyValuelessObject", where the value is
+    // set in the object's prototype, not the object itself.
+
+    var DATE1 = new Date();
+
+    array[item++] = new TestCase(   SECTION,
+                                    "var DATE1 = new Date(); DATE1 + DATE1",
+                                    DATE1.toString() + DATE1.toString(),
+                                    DATE1 + DATE1 );
+
+    array[item++] = new TestCase(   SECTION,
+                                    "var DATE1 = new Date(); DATE1 + 0",
+                                    DATE1.toString() + 0,
+                                    DATE1 + 0 );
+
+    array[item++] = new TestCase(   SECTION,
+                                    "var DATE1 = new Date(); DATE1 + new Number(0)",
+                                    DATE1.toString() + 0,
+                                    DATE1 + new Number(0) );
+
+    array[item++] = new TestCase(   SECTION,
+                                    "var DATE1 = new Date(); DATE1 + true",
+                                    DATE1.toString() + "true",
+                                    DATE1 + true );
+
+    array[item++] = new TestCase(   SECTION,
+                                    "var DATE1 = new Date(); DATE1 + new Boolean(true)",
+                                    DATE1.toString() + "true",
+                                    DATE1 + new Boolean(true) );
+
+    array[item++] = new TestCase(   SECTION,
+                                    "var DATE1 = new Date(); DATE1 + new Boolean(true)",
+                                    DATE1.toString() + "true",
+                                    DATE1 + new Boolean(true) );
+
+    var MYOB1 = new MyObject( DATE1 );
+    var MYOB2 = new MyValuelessObject( DATE1 );
+    var MYOB3 = new MyProtolessObject( DATE1 );
+    var MYOB4 = new MyProtoValuelessObject( DATE1 );
+
+    array[item++] = new TestCase(   SECTION,
+                                    "MYOB1 = new MyObject(DATE1); MYOB1 + new Number(1)",
+                                    "[object Object]1",
+                                    MYOB1 + new Number(1) );
+
+    array[item++] = new TestCase(   SECTION,
+                                    "MYOB1 = new MyObject(DATE1); MYOB1 + 1",
+                                    "[object Object]1",
+                                    MYOB1 + 1 );
+
+    array[item++] = new TestCase(   SECTION,
+                                    "MYOB2 = new MyValuelessObject(DATE1); MYOB3 + 'string'",
+                                    DATE1.toString() + "string",
+                                    MYOB2 + 'string' );
+
+    array[item++] = new TestCase(   SECTION,
+                                    "MYOB2 = new MyValuelessObject(DATE1); MYOB3 + new String('string')",
+                                    DATE1.toString() + "string",
+                                    MYOB2 + new String('string') );
+/*
+    array[item++] = new TestCase(   SECTION,
+                                    "MYOB3 = new MyProtolessObject(DATE1); MYOB3 + new Boolean(true)",
+                                    DATE1.toString() + "true",
+                                    MYOB3 + new Boolean(true) );
+*/
+    array[item++] = new TestCase(   SECTION,
+                                    "MYOB1 = new MyObject(DATE1); MYOB1 + true",
+                                    "[object Object]true",
+                                    MYOB1 + true );
+
+    return ( array );
+}
+function MyProtoValuelessObject() {
+    this.valueOf = new Function ( "" );
+    this.__proto__ = null;
+}
+function MyProtolessObject( value ) {
+    this.valueOf = new Function( "return this.value" );
+    this.__proto__ = null;
+    this.value = value;
+}
+function MyValuelessObject(value) {
+    this.__proto__ = new MyPrototypeObject(value);
+}
+function MyPrototypeObject(value) {
+    this.valueOf = new Function( "return this.value;" );
+    this.toString = new Function( "return (this.value + '');" );
+    this.value = value;
+}
+function MyObject( value ) {
+    this.valueOf = new Function( "return this.value" );
+    this.value = value;
+}