1# **heck** is a case conversion library 2 3 4 5This library exists to provide case conversion between common cases like 6CamelCase and snake_case. It is intended to be unicode aware, internally 7consistent, and reasonably well performing. 8 9## Definition of a word boundary 10 11Word boundaries are defined as the "unicode words" defined in the 12`unicode_segmentation` library, as well as within those words in this manner: 13 141. All underscore characters are considered word boundaries. 152. If an uppercase character is followed by lowercase letters, a word boundary 16is considered to be just prior to that uppercase character. 173. If multiple uppercase characters are consecutive, they are considered to be 18within a single word, except that the last will be part of the next word if it 19is followed by lowercase characters (see rule 2). 20 21That is, "HelloWorld" is segmented `Hello|World` whereas "XMLHttpRequest" is 22segmented `XML|Http|Request`. 23 24Characters not within words (such as spaces, punctuations, and underscores) 25are not included in the output string except as they are a part of the case 26being converted to. Multiple adjacent word boundaries (such as a series of 27underscores) are folded into one. ("hello__world" in snake case is therefore 28"hello_world", not the exact same string). Leading or trailing word boundary 29indicators are dropped, except insofar as CamelCase capitalizes the first word. 30 31### Cases contained in this library: 32 331. CamelCase 342. snake_case 353. kebab-case 364. SHOUTY_SNAKE_CASE 375. mixedCase 386. Title Case 397. SHOUTY-KEBAB-CASE 40 41### Contributing 42 43PRs of additional well-established cases welcome. 44 45This library is a little bit opinionated (dropping punctuation, for example). 46If that doesn't fit your use case, I hope there is another crate that does. I 47would prefer **not** to receive PRs to make this behavior more configurable. 48 49Bug reports & fixes always welcome. :-) 50 51### License 52 53heck is distributed under the terms of both the MIT license and the 54Apache License (Version 2.0). 55 56See LICENSE-APACHE and LICENSE-MIT for details. 57
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