Fix various number parsing issues. (#1648)

For example Number(".") and Number("e5") should be NaN not
zero. Parsing Number("e") caused buffer overflow as well.
Infinity parsing is a bit faster now.

Fixes #1636.

JerryScript-DCO-1.0-Signed-off-by: Zoltan Herczeg zherczeg.u-szeged@partner.samsung.com

tests/jerry/regression-test-issue-1636.js

@@ -0,0 +1,24 @@
+// Copyright JS Foundation and other contributors, http://js.foundation
+//
+// Licensed under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+assert(Number("Infinity") == Infinity);
+assert(isNaN(Number("infinity")));
+assert(isNaN(Number("InfinitY")));
+assert(isNaN(Number("e")));
+assert(isNaN(Number("e3")));
+assert(Number("1e2") == 100);
+assert(isNaN(Number(".")));
+assert(isNaN(Number(".e2")));
+assert(Number("0.") == 0);
+assert(Number(".0") == 0);