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# **heck** is a case conversion library
This library exists to provide case conversion between common cases like
CamelCase and snake_case. It is intended to be unicode aware, internally
consistent, and reasonably well performing.
## Definition of a word boundary
Word boundaries are defined by non-alphanumeric characters, as well as
within those words in this manner:
1. If an uppercase character is followed by lowercase letters, a word
boundary is considered to be just prior to that uppercase character.
2. If multiple uppercase characters are consecutive, they are considered to
be within a single word, except that the last will be part of the next word
if it is followed by lowercase characters (see rule 1).
That is, "HelloWorld" is segmented `Hello|World` whereas "XMLHttpRequest" is
segmented `XML|Http|Request`.
Characters not within words (such as spaces, punctuations, and underscores)
are not included in the output string except as they are a part of the case
being converted to. Multiple adjacent word boundaries (such as a series of
underscores) are folded into one. ("hello__world" in snake case is therefore
"hello_world", not the exact same string). Leading or trailing word boundary
indicators are dropped, except insofar as CamelCase capitalizes the first word.
## Cases contained in this library:
1. UpperCamelCase
2. lowerCamelCase
3. snake_case
4. kebab-case
5. SHOUTY_SNAKE_CASE
6. Title Case
7. SHOUTY-KEBAB-CASE
8. Train-Case
## MSRV
The minimum supported Rust version for this crate is 1.56.0. This may change in
minor or patch releases, but we probably won't ever require a very recent
version. If you would like to have a stronger guarantee than that, please open
an issue.
## License
heck is distributed under the terms of both the MIT license and the
Apache License (Version 2.0).
See LICENSE-APACHE and LICENSE-MIT for details.
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