fix: handling of function names with "lambda" in them (#128)

src/bartiq/symbolics/ast_parser.py

@@ -73,6 +73,7 @@
 _NAMESPACE_IDENTIFIER = rf"{_IDENTIFIER}(\.{_IDENTIFIER})*"
 _PORT_PATTERN = rf"#({_NAMESPACE_IDENTIFIER})"
 _WILDCARD_PATTERN = rf"(({_IDENTIFIER})?)~"
+_LAMBDA_PATTERN = r"(?<![_A-Za-z])lambda(?![A-Za-z])"
 _IN_PATTERN = r"(^|[^\w])in($|[^\w])"
 
 _RESTRICTED_NAMES = {"__lambda__": "lambda", "__in__": "in"}
@@ -133,7 +134,7 @@ def _contains_lambda(expression):
 
 
 def _replace_lambda(expression):
-    return expression.replace("lambda", "__lambda__")
+    return re.sub(_LAMBDA_PATTERN, "__lambda__", expression)
 
 
 # Preprocessing stage replacing symbols named lambda with symbols named __lambda__

tests/symbolics/test_sympy_interpreter.py

@@ -377,6 +377,8 @@ def add_routine_path(symbol):
     ("a.in", Symbol("a.in")),
     ("a.in.b", Symbol("a.in.b")),
     ("in.b", Symbol("in.b")),
+    # Lambda as a part of function name
+    ("calc_lambda(x)", Function("calc_lambda")(Symbol("x"))),
 ]