Vendor in ply as needed

* vendored in some ply subcomponents
  - ply.lex
  - ply.yacc
* updated rest of project to reflect ply vendoring
* updated pyproject to configure black
  - retain defaults
  - skip linting on vendored ply module

.travis.yml

@@ -2,10 +2,6 @@ language: python
 sudo: required
 dist: xenial
 
-env:
-- PLY=ply==3.8
-- PLY=ply
-
 python:
   - "2.7"
   - "3.4"
@@ -15,7 +11,6 @@ python:
 
 # command to install dependencies
 install:
-  - "pip install $PLY"
   - "pip install ."
   - "pip install -r testing-requirements.txt"
   - "pip list"

pyproject.toml

@@ -1,3 +1,25 @@
 [build-system]
-requires = ["setuptools", "wheel", "ply"]
+requires = ["setuptools", "wheel"]
 
+[tool.black]
+line-length = 88
+include = '\.pyi?$'
+exclude = '''
+(
+  /(
+      \.eggs         # exclude a few common directories in the
+    | \.git          # root of the project
+    | \.hg
+    | \.mypy_cache
+    | \.nox
+    | \.tox
+    | \.venv
+    | _build
+    | buck-out
+    | build
+    | dist
+    
+  )/
+  | /src/hcl/ply    # exclude vendored ply module
+)
+'''

requirements.txt

@@ -1 +0,0 @@
-ply>=3.8,<4

src/hcl/lexer.py

@@ -1,6 +1,7 @@
 import re
 import sys
-import ply.lex as lex
+
+from .ply import lex
 
 if sys.version_info < (3,):
     text_type = unicode

src/hcl/parser.py

@@ -2,7 +2,7 @@
 import sys
 
 from .lexer import Lexer
-from ply import lex, yacc
+from .ply import yacc
 
 import inspect
 

src/hcl/ply/__init__.py

@@ -0,0 +1,5 @@
+# PLY package
+# Author: David Beazley (dave@dabeaz.com)
+
+__version__ = '3.11'
+__all__ = ['lex','yacc']