ES6: Duplicate properties are no longer an error

test/preparser/duplicate-property.pyt

-# Copyright 2011 the V8 project authors. All rights reserved.
-# Redistribution and use in source and binary forms, with or without
-# modification, are permitted provided that the following conditions are
-# met:
-#
-#     * Redistributions of source code must retain the above copyright
-#       notice, this list of conditions and the following disclaimer.
-#     * Redistributions in binary form must reproduce the above
-#       copyright notice, this list of conditions and the following
-#       disclaimer in the documentation and/or other materials provided
-#       with the distribution.
-#     * Neither the name of Google Inc. nor the names of its
-#       contributors may be used to endorse or promote products derived
-#       from this software without specific prior written permission.
-#
-# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-# Tests of duplicate properties in object literals.
-
-# ----------------------------------------------------------------------
-# Utility functions to generate a number of tests for each property
-# name pair.
-
-def PropertyTest(name, propa, propb, allow_strict = True):
-  replacement = {"id1": propa, "id2": propb, "name": name}
-
-  # Tests same test in both strict and non-strict context.
-  def StrictTest(name, source, replacement, expectation):
-    if (allow_strict):
-      Template("strict-" + name,
-               "\"use strict\";\n" + source)(replacement, expectation)
-      Template(name, source)(replacement, expectation)
-
-  # This one only fails in non-strict context.
-  if (allow_strict):
-    Template("strict-$name-data-data", """
-        "use strict";
-        var o = {$id1: 42, $id2: 42};
-      """)(replacement, "strict_duplicate_property")
-
-  Template("$name-data-data", """
-      var o = {$id1: 42, $id2: 42};
-    """)(replacement, None)
-
-  StrictTest("$name-data-get", """
-      var o = {$id1: 42, get $id2(){}};
-    """, replacement, "accessor_data_property")
-
-  StrictTest("$name-data-set", """
-      var o = {$id1: 42, set $id2(v){}};
-    """, replacement, "accessor_data_property")
-
-  StrictTest("$name-get-data", """
-      var o = {get $id1(){}, $id2: 42};
-    """, replacement, "accessor_data_property")
-
-  StrictTest("$name-set-data", """
-      var o = {set $id1(v){}, $id2: 42};
-    """, replacement, "accessor_data_property")
-
-  StrictTest("$name-get-get", """
-      var o = {get $id1(){}, get $id2(){}};
-    """, replacement, "accessor_get_set")
-
-  StrictTest("$name-set-set", """
-      var o = {set $id1(v){}, set $id2(v){}};
-    """, replacement, "accessor_get_set")
-
-  StrictTest("$name-nested-get", """
-      var o = {get $id1(){}, o: {get $id2(){} } };
-    """, replacement, None)
-
-  StrictTest("$name-nested-set", """
-      var o = {set $id1(v){}, o: {set $id2(v){} } };
-    """, replacement, None)
-
-
-def TestBothWays(name, propa, propb, allow_strict = True):
-  PropertyTest(name + "-1", propa, propb, allow_strict)
-  PropertyTest(name + "-2", propb, propa, allow_strict)
-
-def TestSame(name, prop, allow_strict = True):
-  PropertyTest(name, prop, prop, allow_strict)
-
-#-----------------------------------------------------------------------
-
-# Simple identifier property
-TestSame("a", "a")
-
-# Get/set identifiers
-TestSame("get-id", "get")
-TestSame("set-id", "set")
-
-# Number properties
-TestSame("0", "0")
-TestSame("0.1", "0.1")
-TestSame("1.0", "1.0")
-TestSame("42.33", "42.33")
-TestSame("2^32-2", "4294967294")
-TestSame("2^32", "4294967296")
-TestSame("2^53", "9007199254740992")
-TestSame("Hex20", "0x20")
-TestSame("exp10", "1e10")
-TestSame("exp20", "1e20")
-TestSame("Oct40", "040", False);
-
-
-# String properties
-TestSame("str-a", '"a"')
-TestSame("str-0", '"0"')
-TestSame("str-42", '"42"')
-TestSame("str-empty", '""')
-
-# Keywords
-TestSame("if", "if")
-TestSame("case", "case")
-
-# Future reserved keywords
-TestSame("public", "public")
-TestSame("class", "class")
-
-
-# Test that numbers are converted to string correctly.
-
-TestBothWays("hex-int", "0x20", "32")
-TestBothWays("oct-int", "040", "32", False)  # Octals disallowed in strict mode.
-TestBothWays("dec-int", "32.00", "32")
-TestBothWays("dec-underflow-int",
-             "32.00000000000000000000000000000000000000001", "32")
-TestBothWays("exp-int", "3.2e1", "32")
-TestBothWays("exp-int", "3200e-2", "32")
-TestBothWays("overflow-inf", "1e2000", "Infinity")
-TestBothWays("overflow-inf-exact", "1.797693134862315808e+308", "Infinity")
-TestBothWays("non-overflow-inf-exact", "1.797693134862315807e+308",
-                                       "1.7976931348623157e+308")
-TestBothWays("underflow-0", "1e-2000", "0")
-TestBothWays("underflow-0-exact", "2.4703282292062E-324", "0")
-TestBothWays("non-underflow-0-exact", "2.4703282292063E-324", "5e-324")
-TestBothWays("precission-loss-high", "9007199254740992", "9007199254740993")
-TestBothWays("precission-loss-low", "1.9999999999999998", "1.9999999999999997")
-TestBothWays("non-canonical-literal-int", "1.0", "1")
-TestBothWays("non-canonical-literal-frac", "1.50", "1.5")
-TestBothWays("rounding-down", "1.12512512512512452", "1.1251251251251244")
-TestBothWays("rounding-up", "1.12512512512512453", "1.1251251251251246")
-
-TestBothWays("hex-int-str", "0x20", '"32"')
-TestBothWays("dec-int-str", "32.00", '"32"')
-TestBothWays("exp-int-str", "3.2e1", '"32"')
-TestBothWays("overflow-inf-str", "1e2000", '"Infinity"')
-TestBothWays("underflow-0-str", "1e-2000", '"0"')
-TestBothWays("non-canonical-literal-int-str", "1.0", '"1"')
-TestBothWays("non-canonical-literal-frac-str", "1.50", '"1.5"')