Reintroduce duplicate identifier detection in preparser.

test/preparser/duplicate-property.pyt

Index: test/preparser/duplicate-property.pyt
diff --git a/test/preparser/duplicate-property.pyt b/test/preparser/duplicate-property.pyt
new file mode 100644
index 0000000000000000000000000000000000000000..5abf9adbcfd96b6ac7ef00808fd9b03e0eac8d87
--- /dev/null
+++ b/test/preparser/duplicate-property.pyt
@@ -0,0 +1,162 @@
+# 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(){}, o: {set $id2(){} } };
+    """, 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"')