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add is_alphabetic to the UnicodeStrPrelude trait #19550

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add is_alphabetic to the UnicodeStrPrelude trait #19550

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18 changes: 18 additions & 0 deletions src/libunicode/u_str.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -93,6 +93,21 @@ pub trait UnicodeStrPrelude for Sized? {
/// ```
fn is_whitespace(&self) -> bool;

/// Returns true if the string contains only alphabetic code
/// points.
///
/// Alphabetic characters are determined by `char::is_alphabetic`.
///
/// # Example
///
/// ```rust
/// assert!("Löwe老虎Léopard".is_alphabetic());
/// assert!("".is_alphabetic());
///
/// assert!( !" &*~".is_alphabetic());
/// ```
fn is_alphabetic(&self) -> bool;

/// Returns true if the string contains only alphanumeric code
/// points.
///
Expand Down Expand Up @@ -149,6 +164,9 @@ impl UnicodeStrPrelude for str {
#[inline]
fn is_whitespace(&self) -> bool { self.chars().all(|c| c.is_whitespace()) }

#[inline]
fn is_alphabetic(&self) -> bool { self.chars().all(|c| c.is_alphabetic()) }

#[inline]
fn is_alphanumeric(&self) -> bool { self.chars().all(|c| c.is_alphanumeric()) }

Expand Down