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[package]
authors = ["Without Boats <woboats@gmail.com>"]
name = "heck"
version = "0.1.0"
license = "MIT OR Apache-2.0"
description = "heck is a case conversion library."
homepage = "https://github.com/withoutboats/heck"
repository = "https://github.com/withoutboats/heck"
documentation = "https://docs.rs/heck"
keywords = ["string", "case", "camel", "snake", "unicode"]
readme = "README.md"
[dependencies]
unicode-segmentation = "1.1.0"

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# **heck** is a case conversion library
[[https://github.com/withoutboats/heck/blob/master/no_step_on_snek.png|alt="I specifically requested the opposite of this."]]
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 as the "unicode words" defined in the
`unicode_segmentation` library, as well as within those words in this manner:
1. All underscore characters are considered word boundaries.
2. A single uppercase letter (followed by no letters or by lowercase letters)
is considered to be just after a word boundary.
3. Multiple consecutive uppercase letters are considered to be between two
word boundaries.
That is, "HelloWorld" is segmented "Hello World" whereas "HELLOworld" is
segmented "HELLO world."
### Cases contained in this library:
1. CamelCase
2. snake_case
3. kebab-case
4. SHOUTY_SNAKE_CASE
5. mixedCase
6. Title Case
### License
heck is primarily 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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/// This trait defines a camel case conversion.
///
/// In CamelCase, word boundaries are indicated by capital letters, including
/// the first word.
///
/// ## Example:
///
/// ```rust
/// extern crate heck;
/// fn main() {
///
/// use heck::CamelCase;
///
/// let sentence = "We are not in the least afraid of ruins.";
/// assert_eq!(sentence.to_camel_case(), "WeAreNotInTheLeastAfraidOfRuins");
/// }
/// ```
pub trait CamelCase: ToOwned {
/// Convert this type to camel case.
fn to_camel_case(&self) -> Self::Owned;
}
impl CamelCase for str {
fn to_camel_case(&self) -> String {
::transform(self, |c, s| s.extend(c.to_uppercase()), |c, s| {
if s.len() == 0 {
s.extend(c.to_uppercase())
} else {
s.extend(c.to_lowercase())
}
})
}
}
#[cfg(test)]
mod tests {
use super::CamelCase;
macro_rules! t {
($t:ident : $s1:expr => $s2:expr) => {
#[test]
fn $t() {
assert_eq!($s1.to_camel_case(), $s2)
}
}
}
t!(test1: "CamelCase" => "CamelCase");
t!(test2: "This is Human case." => "ThisIsHumanCase");
t!(test3: "MixedUp CamelCase, with some Spaces" => "MixedUpCamelCaseWithSomeSpaces");
t!(test4: "mixed_up snake_case, with some _spaces" => "MixedUpSnakeCaseWithSomeSpaces");
t!(test5: "kebab-case" => "KebabCase");
t!(test6: "SHOUTY_SNAKE_CASE" => "ShoutySnakeCase");
t!(test7: "snake_case" => "SnakeCase");
t!(test8: "this-contains_ ALLkinds OfWord_Boundaries" => "ThisContainsAllKindsOfWordBoundaries");
// TODO unicode tests
}

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/// This trait defines a kebab case conversion.
///
/// In kebab-case, word boundaries are indicated by hyphens.
///
/// ## Example:
///
/// ```rust
/// extern crate heck;
/// fn main() {
///
/// use heck::KebabCase;
///
/// let sentence = "We are going to inherit the earth.";
/// assert_eq!(sentence.to_kebab_case(), "we-are-going-to-inherit-the-earth");
/// }
/// ```
pub trait KebabCase: ToOwned {
/// Convert this type to kebab case.
fn to_kebab_case(&self) -> Self::Owned;
}
impl KebabCase for str {
fn to_kebab_case(&self) -> Self::Owned {
::transform(self, |c, s| {
s.push('-');
s.extend(c.to_lowercase())
}, |c, s| s.extend(c.to_lowercase()))
}
}
#[cfg(test)]
mod tests {
use super::KebabCase;
macro_rules! t {
($t:ident : $s1:expr => $s2:expr) => {
#[test]
fn $t() {
assert_eq!($s1.to_kebab_case(), $s2)
}
}
}
t!(test1: "CamelCase" => "camel-case");
t!(test2: "This is Human case." => "this-is-human-case");
t!(test3: "MixedUp CamelCase, with some Spaces" => "mixed-up-camel-case-with-some-spaces");
t!(test4: "mixed_up snake_case with some _spaces" => "mixed-up-snake-case-with-some-spaces");
t!(test5: "kebab-case" => "kebab-case");
t!(test6: "SHOUTY_SNAKE_CASE" => "shouty-snake-case");
t!(test7: "snake_case" => "snake-case");
t!(test8: "this-contains_ ALLkinds OfWord_Boundaries" => "this-contains-all-kinds-of-word-boundaries");
}

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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 as the "unicode words" defined in the
//! `unicode_segmentation` library, as well as within those words in this manner:
//!
//! 1. All underscore characters are considered word boundaries.
//! 2. A single uppercase letter (followed by no letters or by lowercase letters)
//! is considered to be just after a word boundary.
//! 3. Multiple consecutive uppercase letters are considered to be between two
//! word boundaries.
//!
//! That is, "HelloWorld" is segmented "Hello World" whereas "HELLOworld" is
//! segmented "HELLO world."
//!
//! ### Cases contained in this library:
//!
//! 1. CamelCase
//! 2. snake_case
//! 3. kebab-case
//! 4. SHOUTY_SNAKE_CASE
//! 5. mixedCase
//! 6. Title Case
#![deny(missing_docs)]
extern crate unicode_segmentation;
mod camel;
mod kebab;
mod mixed;
mod shouty_snake;
mod snake;
mod title;
pub use camel::CamelCase;
pub use kebab::KebabCase;
pub use mixed::MixedCase;
pub use shouty_snake::{ShoutySnakeCase, ShoutySnekCase};
pub use snake::{SnakeCase, SnekCase};
pub use title::TitleCase;
use unicode_segmentation::UnicodeSegmentation;
fn transform<F, G>(s: &str, word_boundary: F, not_word_boundary: G) -> String
where
F: Fn(char, &mut String),
G: Fn(char, &mut String),
{
let mut out = String::new();
let mut after_word_boundary = false;
for word in s.unicode_words() {
if out.len() != 0 { after_word_boundary = true; }
let mut last_c_was_uppercase = false;
let mut multiple_uppercase = false;
for c in word.chars() {
if c == '_' {
after_word_boundary = true;
continue
}
if c.is_uppercase() {
if out.len() != 0 && !last_c_was_uppercase {
after_word_boundary = true;
}
if last_c_was_uppercase {
multiple_uppercase = true;
}
last_c_was_uppercase = true;
} else {
if multiple_uppercase && !after_word_boundary {
after_word_boundary = true;
}
multiple_uppercase = false;
last_c_was_uppercase = false;
}
if after_word_boundary {
word_boundary(c, &mut out);
} else {
not_word_boundary(c, &mut out);
}
after_word_boundary = false;
}
}
out
}

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/// This trait defines a mixed case conversion.
///
/// In mixedCase, word boundaries are indicated by capital letters, excepting
/// the first word.
///
/// ## Example:
///
/// ```rust
/// extern crate heck;
/// fn main() {
///
/// use heck::MixedCase;
///
/// let sentence = "It is we who built these palaces and cities.";
/// assert_eq!(sentence.to_mixed_case(), "itIsWeWhoBuiltThesePalacesAndCities");
/// }
/// ```
pub trait MixedCase: ToOwned {
/// Convert this type to mixed case.
fn to_mixed_case(&self) -> Self::Owned;
}
impl MixedCase for str {
fn to_mixed_case(&self) -> String {
::transform(self, |c, s| s.extend(c.to_uppercase()), |c, s| s.extend(c.to_lowercase()))
}
}
#[cfg(test)]
mod tests {
use super::MixedCase;
macro_rules! t {
($t:ident : $s1:expr => $s2:expr) => {
#[test]
fn $t() {
assert_eq!($s1.to_mixed_case(), $s2)
}
}
}
t!(test1: "CamelCase" => "camelCase");
t!(test2: "This is Human case." => "thisIsHumanCase");
t!(test3: "MixedUp CamelCase, with some Spaces" => "mixedUpCamelCaseWithSomeSpaces");
t!(test4: "mixed_up snake_case, with some _spaces" => "mixedUpSnakeCaseWithSomeSpaces");
t!(test5: "kebab-case" => "kebabCase");
t!(test6: "SHOUTY_SNAKE_CASE" => "shoutySnakeCase");
t!(test7: "snake_case" => "snakeCase");
t!(test8: "this-contains_ ALLkinds OfWord_Boundaries" => "thisContainsAllKindsOfWordBoundaries");
// TODO unicode tests
}

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/// This trait defines a shouty snake case conversion.
///
/// In SHOUTY_SNAKE_CASE, word boundaries are indicated by underscores and all
/// words are in uppercase.
///
/// ## Example:
///
/// ```rust
/// extern crate heck;
/// fn main() {
///
/// use heck::ShoutySnakeCase;
///
/// let sentence = "That world is growing in this minute.";
/// assert_eq!(sentence.to_shouty_snake_case(), "THAT_WORLD_IS_GROWING_IN_THIS_MINUTE");
/// }
/// ```
pub trait ShoutySnakeCase: ToOwned {
/// Convert this type to shouty snake case.
fn to_shouty_snake_case(&self) -> Self::Owned;
}
/// Oh heck, ShoutySnekCase is an alias for ShoutySnakeCase. See ShoutySnakeCase for
/// more documentation.
pub trait ShoutySnekCase: ToOwned {
/// CONVERT THIS TYPE TO SNEK CASE.
#[allow(non_snake_case)]
fn TO_SHOUTY_SNEK_CASE(&self) -> Self::Owned;
}
impl<T: ShoutySnakeCase> ShoutySnekCase for T {
fn TO_SHOUTY_SNEK_CASE(&self) -> Self::Owned {
self.to_shouty_snake_case()
}
}
impl ShoutySnakeCase for str {
fn to_shouty_snake_case(&self) -> Self::Owned {
::transform(self, |c, s| {
s.push('_');
s.extend(c.to_uppercase())
}, |c, s| s.extend(c.to_uppercase()))
}
}
#[cfg(test)]
mod tests {
use super::ShoutySnakeCase;
macro_rules! t {
($t:ident : $s1:expr => $s2:expr) => {
#[test]
fn $t() {
assert_eq!($s1.to_shouty_snake_case(), $s2)
}
}
}
t!(test1: "CamelCase" => "CAMEL_CASE");
t!(test2: "This is Human case." => "THIS_IS_HUMAN_CASE");
t!(test3: "MixedUp CamelCase, with some Spaces" => "MIXED_UP_CAMEL_CASE_WITH_SOME_SPACES");
t!(test4: "mixed_up snake_case with some _spaces" => "MIXED_UP_SNAKE_CASE_WITH_SOME_SPACES");
t!(test5: "kebab-case" => "KEBAB_CASE");
t!(test6: "SHOUTY_SNAKE_CASE" => "SHOUTY_SNAKE_CASE");
t!(test7: "snake_case" => "SNAKE_CASE");
t!(test8: "this-contains_ ALLkinds OfWord_Boundaries" => "THIS_CONTAINS_ALL_KINDS_OF_WORD_BOUNDARIES");
// TODO unicode tests
}

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/// This trait defines a camel case conversion.
///
/// In snake_case, word boundaries are indicated by underscores.
///
/// ## Example:
///
/// ```rust
/// extern crate heck;
/// fn main() {
///
/// use heck::SnakeCase;
///
/// let sentence = "We carry a new world here, in our hearts.";
/// assert_eq!(sentence.to_snake_case(), "we_carry_a_new_world_here_in_our_hearts");
/// }
/// ```
pub trait SnakeCase: ToOwned {
/// Convert this type to snake case.
fn to_snake_case(&self) -> Self::Owned;
}
/// Oh heck, SnekCase is an alias for SnakeCase. See SnakeCase for
/// more documentation.
pub trait SnekCase: ToOwned {
/// Convert this type to snek case.
fn to_snek_case(&self) -> Self::Owned;
}
impl<T: SnakeCase> SnekCase for T {
fn to_snek_case(&self) -> Self::Owned {
self.to_snake_case()
}
}
impl SnakeCase for str {
fn to_snake_case(&self) -> String {
::transform(self, |c, s| {
s.push('_');
s.extend(c.to_lowercase())
}, |c, s| s.extend(c.to_lowercase()))
}
}
#[cfg(test)]
mod tests {
use super::SnakeCase;
macro_rules! t {
($t:ident : $s1:expr => $s2:expr) => {
#[test]
fn $t() {
assert_eq!($s1.to_snake_case(), $s2)
}
}
}
t!(test1: "CamelCase" => "camel_case");
t!(test2: "This is Human case." => "this_is_human_case");
t!(test3: "MixedUp CamelCase, with some Spaces" => "mixed_up_camel_case_with_some_spaces");
t!(test4: "mixed_up snake_case with some _spaces" => "mixed_up_snake_case_with_some_spaces");
t!(test5: "kebab-case" => "kebab_case");
t!(test6: "SHOUTY_SNAKE_CASE" => "shouty_snake_case");
t!(test7: "snake_case" => "snake_case");
t!(test8: "this-contains_ ALLkinds OfWord_Boundaries" => "this_contains_all_kinds_of_word_boundaries");
// TODO unicode tests
}

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/// This trait defines a title case conversion.
///
/// In Title Case, word boundaries are indicated by spaces, and every word is
/// capitalized.
///
/// ## Example:
///
/// ```rust
/// extern crate heck;
/// fn main() {
///
/// use heck::TitleCase;
///
/// let sentence = "We have always lived in slums and holes in the wall.";
/// assert_eq!(sentence.to_title_case(), "We Have Always Lived In Slums And Holes In The Wall");
/// }
/// ```
pub trait TitleCase: ToOwned {
/// Convert this type to title case.
fn to_title_case(&self) -> Self::Owned;
}
impl TitleCase for str {
fn to_title_case(&self) -> String {
::transform(self, |c, s| {
s.push(' ');
s.extend(c.to_uppercase())
}, |c, s| {
if s.len() == 0 {
s.extend(c.to_uppercase())
} else {
s.extend(c.to_lowercase())
}
})
}
}
#[cfg(test)]
mod tests {
use super::TitleCase;
macro_rules! t {
($t:ident : $s1:expr => $s2:expr) => {
#[test]
fn $t() {
assert_eq!($s1.to_title_case(), $s2)
}
}
}
t!(test1: "CamelCase" => "Camel Case");
t!(test2: "This is Human case." => "This Is Human Case");
t!(test3: "MixedUp CamelCase, with some Spaces" => "Mixed Up Camel Case With Some Spaces");
t!(test4: "mixed_up snake_case, with some _spaces" => "Mixed Up Snake Case With Some Spaces");
t!(test5: "kebab-case" => "Kebab Case");
t!(test6: "SHOUTY_SNAKE_CASE" => "Shouty Snake Case");
t!(test7: "snake_case" => "Snake Case");
t!(test8: "this-contains_ ALLkinds OfWord_Boundaries" => "This Contains All Kinds Of Word Boundaries");
// TODO unicode tests
}