py-antlr4-python3-runtime: new package (#11890)

* py-antlr4-python3-runtime: new package

* py-antlr4-python3-runtime: fix for flake8

* py-antlr4-python3-runtime: indent docstring

* py-antlr4-python3-runtime: clarify role of this package vs ANTLR in docstring

* py-antlr4-python3-runtime: remove whitespace at end of line

var/spack/repos/builtin/packages/py-antlr4-python3-runtime/package.py

@@ -0,0 +1,21 @@
+# Copyright 2013-2019 Lawrence Livermore National Security, LLC and other
+# Spack Project Developers. See the top-level COPYRIGHT file for details.
+#
+# SPDX-License-Identifier: (Apache-2.0 OR MIT)
+
+from spack import *
+
+
+class PyAntlr4Python3Runtime(PythonPackage):
+    """This package provides runtime libraries required to use
+    parsers generated for the Python3 language by version 4 of
+    ANTLR (ANother Tool for Language Recognition).
+    """
+
+    homepage = "https://www.antlr.org"
+    url      = "https://pypi.io/packages/source/a/antlr4-python3-runtime/antlr4-python3-runtime-4.7.2.tar.gz"
+
+    version('4.7.2', sha256='168cdcec8fb9152e84a87ca6fd261b3d54c8f6358f42ab3b813b14a7193bb50b')
+
+    depends_on('python@3:', type=('build', 'run'))
+    depends_on('py-setuptools', type='build')