Summary of Intact Case

At last, summarize the rules of Intact Case.

camelCase ⇒ snake_case

1. Tokenize.
2. Add delimiter to after each acronym.
3. Convert all words to lowercase.
4. Concatenate words with between delimiter.

snake_case ⇒ camelCase

1. Tokenize.
2. Capitalize each word except first.
3. If last letter of the word is a delimiter, remove the delimiter and to capitalize all letter of the word.
4. When two or more uppercase-acronyms are successive, to use delimiter between them.
5. Concatenate.

snake_case ⇒ StudlyCase

1. Tokenize.
2. Capitalize each word.
3. If last letter of the word is a delimiter, remove the delimiter and to capitalize all letter of the word.
4. When two or more uppercase-acronyms are successive, to use delimiter between them.
5. Concatenate.

camelCase ⇒ StudlyCaps

1. Convert camelCase to snake_case.
2. Convert snake_case to StudlyCaps.

StudlyCaps ⇒ camelCase

1. Convert StudlyCaps to snake_case.
2. Convert snake_case to camelCase.