copy project from century 2in6 esl project

external/nano-pb/generator/camel_case_splitter.py

@@ -0,0 +1,35 @@
+def split_camel_case(input):
+    def remove_camel_case(camel_case_input):
+        no_camel_case = ""
+        if len(camel_case_input) <= 0:
+            return ""
+        no_camel_case += camel_case_input[0].lower()
+        for c in camel_case_input[1:]:
+            if c.isupper():
+                no_camel_case += "_" + c.lower()
+            else:
+                no_camel_case += c
+        return no_camel_case
+
+    underscore_split = input.split("_")
+    retval = ""
+    for i in underscore_split:
+        if is_camel_case_name(i):
+            retval += remove_camel_case(i) + "_"
+        else:
+            retval += i + "_"
+
+    return retval[:-1].replace("__", "_")
+
+
+def is_camel_case_name(input):
+    if '_' in input:
+        return False
+
+    if input.islower():
+        return False
+
+    if input.isupper():
+        return False
+
+    return True