better tests for left recursion

DHParser/parsers.py

@@ -198,7 +198,7 @@ def add_parser_guard(parser_func):
                 # because caching would interfere with changes of variable state
                 if not (grammar.rollback__ and grammar.rollback__[-1][0] <= location):
                     parser.visited[location] = (node, rest)
-                grammar.last_node__ = node   # store last node for Lookbehind operator
+                grammar.last_node__ = node   # store last node for Lookbehind parser
             elif location in parser.visited:
                 # if parser did non match but a saved result exits, assume
                 # left recursion and use the saved result
@@ -1293,7 +1293,7 @@ def compile_source(source: str,
         transformer (function):  A transformation function that takes
             the root-node of the concrete syntax tree as an argument and
             transforms it (in place) into an abstract syntax tree.
-compiler (function): A compiler function or compiler class
+        compiler (function): A compiler function or compiler class
             instance 
 
     Returns (tuple):

test/test_parsers.py

@@ -79,11 +79,11 @@ ARITHMETIC2_EBNF = """
 class TestInfiLoopsAndRecursion:
     def test_direct_left_recursion(self):
         minilang = ARITHMETIC_EBNF
-        snippet = "5 + 3 * 4"
+        snippet = "9 + 8 + 7 + 6 + 5 + 3 * 4"
         parser = parser_factory(minilang)()
         assert parser
         syntax_tree = parser(snippet)
-        assert not syntax_tree.collect_errors()
+        assert not syntax_tree.error_flag, str(syntax_tree.collect_errors())
         assert snippet == str(syntax_tree)
         if is_logging():
             syntax_tree.log("test_LeftRecursion_direct.cst")
@@ -91,7 +91,7 @@ class TestInfiLoopsAndRecursion:
 
     def test_indirect_left_recursion(self):
         minilang = ARITHMETIC2_EBNF
-        snippet = "5 + 3 * 4"
+        snippet = "9 + 8 + 7 + 6 + 5 + 3 * 4"
         parser = parser_factory(minilang)()
         assert parser
         syntax_tree = parser(snippet)