Added to_const str converter utility

Author: syrusakbary

graphene/utils/__init__.py

@@ -1,4 +1,4 @@
-from .str_converters import to_camel_case, to_snake_case
+from .str_converters import to_camel_case, to_snake_case, to_const
 from .proxy_snake_dict import ProxySnakeDict
 from .caching import cached_property, memoize
 from .maybe_func import maybe_func
@@ -7,6 +7,6 @@
 from .lazylist import LazyList
 
 
-__all__ = ['to_camel_case', 'to_snake_case', 'ProxySnakeDict',
+__all__ = ['to_camel_case', 'to_snake_case', 'to_const', 'ProxySnakeDict',
            'cached_property', 'memoize', 'maybe_func', 'enum_to_graphql_enum',
            'resolve_only_args', 'LazyList']

graphene/utils/str_converters.py

@@ -15,3 +15,7 @@ def to_camel_case(snake_str):
 def to_snake_case(name):
     s1 = re.sub('(.)([A-Z][a-z]+)', r'\1_\2', name)
     return re.sub('([a-z0-9])([A-Z])', r'\1_\2', s1).lower()
+
+
+def to_const(string):
+    return re.sub('[\W|^(?=\d)]+', '_', string).upper()

graphene/utils/tests/test_str_converter.py

@@ -1,4 +1,5 @@
-from ..str_converters import to_camel_case, to_snake_case
+# coding: utf-8
+from ..str_converters import to_camel_case, to_snake_case, to_const
 
 
 def test_snake_case():
@@ -15,3 +16,8 @@ def test_camel_case():
     assert to_camel_case('snakes_on_a_plane') == 'snakesOnAPlane'
     assert to_camel_case('snakes_on_a__plane') == 'snakesOnA_Plane'
     assert to_camel_case('i_phone_hysteria') == 'iPhoneHysteria'
+
+
+def test_to_const():
+    assert to_const('snakes  on a plane') == 'SNAKES_ON_A_PLANE'
+    assert to_const('weirdñáunicode$# word') == 'WEIRD_UNICODE_WORD'