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import re

"""

general info:

https://en.wikipedia.org/wiki/Naming_convention_(programming)#Python_and_Ruby

pascal case [ an upper Camel Case ]: https://en.wikipedia.org/wiki/Camel_case

camel case: https://en.wikipedia.org/wiki/Camel_case

kebab case [ can be found in general info ]:

https://en.wikipedia.org/wiki/Naming_convention_(programming)#Python_and_Ruby

snake case: https://en.wikipedia.org/wiki/Snake_case

"""

# assistant functions

def split_input(str_: str) -> list:

"""

>>> split_input("one two 31235three4four")

[['one', 'two', '31235three4four']]

"""

return [char.split() for char in re.split(r"[^ a-z A-Z 0-9 \s]", str_)]

def to_simple_case(str_: str) -> str:

"""

>>> to_simple_case("one two 31235three4four")

'OneTwo31235three4four'

>>> to_simple_case("This should be combined")

'ThisShouldBeCombined'

>>> to_simple_case("The first letters are capitalized, then string is merged")

'TheFirstLettersAreCapitalizedThenStringIsMerged'

>>> to_simple_case("special characters :, ', %, ^, $, are ignored")

'SpecialCharactersAreIgnored'

"""

string_split = split_input(str_)

return "".join(

["".join([char.capitalize() for char in sub_str]) for sub_str in string_split]

)

def to_complex_case(text: str, upper: bool, separator: str) -> str:

"""

Returns the string concatenated with the delimiter we provide.

Parameters:

@text: The string on which we want to perform operation

@upper: Boolean value to determine whether we want capitalized result or not

@separator: The delimiter with which we want to concatenate words

Examples:

>>> to_complex_case("one two 31235three4four", True, "_")

'ONE_TWO_31235THREE4FOUR'

>>> to_complex_case("one two 31235three4four", False, "-")

'one-two-31235three4four'

"""

try:

string_split = split_input(text)

if upper:

res_str = "".join(

[

separator.join([char.upper() for char in sub_str])

for sub_str in string_split

]

)

else:

res_str = "".join(

[

separator.join([char.lower() for char in sub_str])

for sub_str in string_split

]

)

return res_str

except IndexError:

return "not valid string"

# main content

def to_pascal_case(text: str) -> str:

"""

>>> to_pascal_case("one two 31235three4four")

'OneTwo31235three4four'

"""

return to_simple_case(text)

def to_camel_case(text: str) -> str:

"""

>>> to_camel_case("one two 31235three4four")

'oneTwo31235three4four'

"""

try:

res_str = to_simple_case(text)

return res_str[0].lower() + res_str[1:]

except IndexError:

return "not valid string"

def to_snake_case(text: str, upper: bool) -> str:

"""

>>> to_snake_case("one two 31235three4four", True)

'ONE_TWO_31235THREE4FOUR'

>>> to_snake_case("one two 31235three4four", False)

'one_two_31235three4four'

"""

return to_complex_case(text, upper, "_")

def to_kebab_case(text: str, upper: bool) -> str:

"""

>>> to_kebab_case("one two 31235three4four", True)

'ONE-TWO-31235THREE4FOUR'

>>> to_kebab_case("one two 31235three4four", False)

'one-two-31235three4four'

"""

return to_complex_case(text, upper, "-")

if __name__ == "__main__":

__import__("doctest").testmod()