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/// An extension to
/// [`String`](https://doc.rust-lang.org/std/string/struct.String.html)
/// allowing for inline trimming.
pub trait StringExt {
/// Mutates a string in place with leading and trailing whitespace removed.
///
/// 'Whitespace' is defined according to the terms of the Unicode Derived
/// Core Property `White_Space`.
///
/// # Examples
///
/// ```rust
/// use fenn::StringExt;
///
/// let mut test = String::from(" Hello World! ");
///
/// test.trim();
///
/// assert_eq!(test, String::from("Hello World!"));
/// ```
fn trim(&mut self);
/// Mutates a string in place with all suffixes that match a pattern repeatedly removed.
///
/// # Examples
///
/// ```rust
/// use fenn::StringExt;
///
/// let mut test = String::from("blahHello World!blah");
///
/// test.trim_matches("blah");
///
/// assert_eq!(test, String::from("Hello World!"));
/// ```
///
/// # Note
///
/// Once the Pattern API ([#27721](https://github.com/rust-lang/rust/issues/27721)) becomes stable
/// this will be changed to accept a pattern.
fn trim_matches(&mut self, rem: &str);
/// Mutates a string in place with leading whitespace removed.
///
/// 'Whitespace' is defined according to the terms of the Unicode Derived
/// Core Property `White_Space`.
///
/// # Text directionality
///
/// A string is a sequence of bytes. `start` in this context means the first
/// position of that byte string; for a left-to-right language like English or
/// Russian, this will be left side, and for right-to-left languages like
/// Arabic or Hebrew, this will be the right side.
///
/// # Examples
///
/// ```rust
/// use fenn::StringExt;
///
/// let mut test = String::from(" Hello World!");
///
/// test.trim_start();
///
/// assert_eq!(test, String::from("Hello World!"));
/// ```
fn trim_start(&mut self);
/// Mutates a string in place with all suffixes that match a pattern repeatedly removed.
///
/// # Text directionality
///
/// A string is a sequence of bytes. `start` in this context means the first
/// position of that byte string; for a left-to-right language like English or
/// Russian, this will be left side, and for right-to-left languages like
/// Arabic or Hebrew, this will be the right side.
///
/// # Examples
///
/// ```rust
/// use fenn::StringExt;
///
/// let mut test = String::from("blahHello World!");
///
/// test.trim_start_matches("blah");
///
/// assert_eq!(test, String::from("Hello World!"));
/// ```
///
/// # Note
///
/// Once the Pattern API ([#27721](https://github.com/rust-lang/rust/issues/27721)) becomes stable
/// this will be changed to accept a pattern.
fn trim_start_matches(&mut self, rem: &str);
/// Mutates a string in place with trailing whitespace removed.
///
/// 'Whitespace' is defined according to the terms of the Unicode Derived
/// Core Property `White_Space`.
///
/// # Text directionality
///
/// A string is a sequence of bytes. 'Left' in this context means the first
/// position of that byte string; for a language like Arabic or Hebrew
/// which are 'right to left' rather than 'left to right', this will be
/// the _right_ side, not the left.
///
/// # Examples
///
/// ```rust
/// use fenn::StringExt;
///
/// let mut test = String::from("Hello World! ");
///
/// test.trim_end();
///
/// assert_eq!(test, String::from("Hello World!"));
/// ```
fn trim_end(&mut self);
/// Mutates a string in place with all suffixes that match a pattern repeatedly removed.
///
/// # Text directionality
///
/// A string is a sequence of bytes. 'Left' in this context means the first
/// position of that byte string; for a language like Arabic or Hebrew
/// which are 'right to left' rather than 'left to right', this will be
/// the _right_ side, not the left.
///
/// ```rust
/// use fenn::StringExt;
///
/// let mut test = String::from("Hello World!blah");
///
/// test.trim_end_matches("blah");
///
/// assert_eq!(test, String::from("Hello World!"));
/// ```
///
/// # Note
///
/// Once the Pattern API ([#27721](https://github.com/rust-lang/rust/issues/27721)) becomes stable
/// this will be changed to accept a pattern.
fn trim_end_matches(&mut self, rem: &str);
}
impl StringExt for super::lib::String {
fn trim(&mut self) {
self.trim_start();
self.trim_end();
}
fn trim_matches(&mut self, rem: &str) {
self.trim_start_matches(rem);
self.trim_end_matches(rem);
}
fn trim_start(&mut self) {
while self.starts_with(char::is_whitespace) {
self.drain(..1);
}
}
fn trim_start_matches(&mut self, rem: &str) {
while self.starts_with(rem) {
self.drain(..rem.len());
}
}
fn trim_end(&mut self) {
while self.ends_with(char::is_whitespace) {
self.truncate(self.len().saturating_sub(1));
}
}
fn trim_end_matches(&mut self, rem: &str) {
while self.ends_with(rem) {
self.truncate(self.len().saturating_sub(rem.len()));
}
}
}