Diagram improvements IV (#225)

* Add diagram documentation, add more diagram tests, allow more
customization of diagrams

* Remove accidental edit of unrelated documentation

* Add diagram package

* Add jinja file to manifest

* Add to bdist also

* package_data

* Railroad improvements

* Partial rewrite

* Update

* Use partials everywhere so we can edit the tree before it's constructed

* Rewrite the diagram generator to not duplicate any content; use
monospaced font for titles

* Small documentation change

* Revert back to Python 3.5 type hints, fix a small bug

* More diagram fixes

* Even more pruning; update docs to use SQL example

* Don't check the string value of names now that we don't have to

1 files changed, 14 insertions, 4 deletions

diff --git a/tests/test_diagram.py b/tests/test_diagram.py
index a449bb0..eeb1ee8 100644
--- a/tests/test_diagram.py
+++ b/tests/test_diagram.py
@@ -4,6 +4,7 @@ from examples.simpleBool import boolExpr
 from examples.simpleSQL import simpleSQL
 from examples.mozillaCalendarParser import calendars
 from pyparsing.diagram import to_railroad, railroad_to_html
+from pyparsing import Or
 import tempfile
 import os
 
@@ -26,26 +27,29 @@ class TestRailroadDiagrams(unittest.TestCase):
     def test_bool_expr(self):
         with self.get_temp() as temp:
             railroad = to_railroad(boolExpr)
+            assert len(railroad) == 3
             temp.write(railroad_to_html(railroad))
 
             if self.railroad_debug():
-                print(temp.name)
+                print("bool expr:" + temp.name)
 
     def test_json(self):
         with self.get_temp() as temp:
             railroad = to_railroad(jsonObject)
+            assert len(railroad) == 4
             temp.write(railroad_to_html(railroad))
 
             if self.railroad_debug():
-                print(temp.name)
+                print("json: " + temp.name)
 
     def test_sql(self):
         with self.get_temp() as temp:
             railroad = to_railroad(simpleSQL)
+            assert len(railroad) == 7
             temp.write(railroad_to_html(railroad))
 
             if self.railroad_debug():
-                print(temp.name)
+                print("sql: " + temp.name)
 
     def test_calendars(self):
         with self.get_temp() as temp:
@@ -53,4 +57,10 @@ class TestRailroadDiagrams(unittest.TestCase):
             temp.write(railroad_to_html(railroad))
 
             if self.railroad_debug():
-                print(temp.name)
+                print("calendar: " + temp.name)
+
+    def test_none_name(self):
+        grammar = Or(["foo", "bar"])
+        railroad = to_railroad(grammar)
+        assert len(railroad) == 1
+        assert railroad[0].name is not None