Corrected bug where upper cased functions would not register as functions

Author: charon25

setup.py

@@ -5,7 +5,7 @@
 
 setuptools.setup(
 	name="shunting-yard",
-	version="1.0.8",
+	version="1.0.9",
 	author="Paul 'charon25' Kern",
 	description="Compute any math expression",
 	long_description=long_description,
@@ -14,5 +14,5 @@
 	url="https://www.github.com/charon25/ShuntingYard",
 	license="MIT",
 	packages=['shunting_yard'],
-	download_url="https://github.com/charon25/ShuntingYard/archive/refs/tags/v1.0.8.tar.gz"
+	download_url="https://github.com/charon25/ShuntingYard/archive/refs/tags/v1.0.9.tar.gz"
 )

shunting_yard/constants.py

@@ -1,12 +1,12 @@
-from string import ascii_lowercase, digits
+from string import ascii_lowercase, ascii_uppercase, digits
 
 
 UNARY_OPERATORS = '+-'
 UNARY_OPERATORS_SYMBOLS = ('-u', '+u')
 BASE_OPERATORS = '+-*/^'
 NUMBER_CHARS = digits + '.'
 # functions cannot start with a number
-FUNCTION_FIRST_CHARS = ascii_lowercase + '_'
+FUNCTION_FIRST_CHARS = ascii_lowercase + ascii_uppercase + '_'
 FUNCTION_CHARS = FUNCTION_FIRST_CHARS + NUMBER_CHARS
 
 SEPARATORS_NO_CLOSING_BRACKET = '(,;'

shunting_yard/rpn.py

@@ -1,6 +1,6 @@
+import math
 from operator import add, mul, neg, pos, sub, truediv
 from typing import Any, Callable, Optional, Union
-import math
 
 from shunting_yard.constants import NUMBER_CHARS
 

shunting_yard/shunting_yard.py

@@ -1,7 +1,7 @@
 from enum import Enum
-from typing import Optional
 import math
 import re
+from typing import Optional
 
 from shunting_yard.tokenize import tokenize
 from shunting_yard.constants import BASE_OPERATORS, NUMBER_CHARS, FUNCTION_CHARS, SEPARATORS, SEPARATORS_NO_CLOSING_BRACKET, UNARY_OPERATORS_SYMBOLS

tests/test_tokenize.py

@@ -73,6 +73,11 @@ def test_function_unary_in_function(self):
     def test_digits_in_function_name(self):
         self.assertListEqual(list(tokenize('min3(1, 2)')), ['min3', '(', '1', ',', '2', ')'])
 
+    def test_upper_case_functions(self):
+        self.assertListEqual(list(tokenize('Sin(x)')), ['Sin', '(', 'x', ')'])
+        self.assertListEqual(list(tokenize('sIN(x)')), ['sIN', '(', 'x', ')'])
+        self.assertListEqual(list(tokenize('SIN(x)')), ['SIN', '(', 'x', ')'])
+
 
 class TestRemoveImplicitMultiplication(unittest.TestCase):