Struct ascii::AsciiString

pub struct AsciiString { /* fields omitted */ }

A growable string stored as an ASCII encoded buffer.

Methods

impl AsciiString

pub fn new() -> Self

Creates a new, empty ASCII string buffer without allocating.

Examples

let mut s = AsciiString::new();

pub fn with_capacity(capacity: usize) -> Self

Creates a new ASCII string buffer with the given capacity. The string will be able to hold exactly capacity bytes without reallocating. If capacity is 0, the ASCII string will not allocate.

Examples

let mut s = AsciiString::with_capacity(10);

pub unsafe fn from_raw_parts(
    buf: *mut AsciiChar,
    length: usize,
    capacity: usize
) -> Self

Creates a new AsciiString from a length, capacity and pointer.

Safety

This is highly unsafe, due to the number of invariants that aren't checked:

• The memory at ptr need to have been previously allocated by the same allocator this library uses.
• length needs to be less than or equal to capacity.
• capacity needs to be the correct value.

Violating these may cause problems like corrupting the allocator's internal datastructures.

Examples

Basic usage:

use std::mem;

unsafe {
   let s = AsciiString::from_ascii("hello").unwrap();
   let ptr = s.as_ptr();
   let len = s.len();
   let capacity = s.capacity();

   mem::forget(s);

   let s = AsciiString::from_raw_parts(ptr as *mut _, len, capacity);

   assert_eq!(AsciiString::from_ascii("hello").unwrap(), s);
}

pub unsafe fn from_ascii_unchecked<B>(bytes: B) -> Self where
    B: Into<Vec<u8>>, 

Converts a vector of bytes to an AsciiString without checking for non-ASCII characters.

Safety

This function is unsafe because it does not check that the bytes passed to it are valid ASCII characters. If this constraint is violated, it may cause memory unsafety issues with future of the AsciiString, as the rest of this library assumes that AsciiStrings are ASCII encoded.

pub fn from_ascii<B>(bytes: B) -> Result<AsciiString, B> where
    B: Into<Vec<u8>> + AsRef<[u8]>, 

Converts anything that can represent a byte buffer into an AsciiString.

Failure

Returns the byte buffer if not all of the bytes are ASCII characters.

Examples

let foo = AsciiString::from_ascii("foo").unwrap();
let err = AsciiString::from_ascii("Ŋ");
assert_eq!(foo.as_str(), "foo");
assert_eq!(err, Err("Ŋ"));

pub fn push_str(&mut self, string: &AsciiStr)

Pushes the given ASCII string onto this ASCII string buffer.

Examples

use std::str::FromStr;
let mut s = AsciiString::from_str("foo").unwrap();
s.push_str("bar".as_ascii_str().unwrap());
assert_eq!(s, "foobar".as_ascii_str().unwrap());

pub fn capacity(&self) -> usize

Returns the number of bytes that this ASCII string buffer can hold without reallocating.

Examples

let s = String::with_capacity(10);
assert!(s.capacity() >= 10);

pub fn reserve(&mut self, additional: usize)

Reserves capacity for at least additional more bytes to be inserted in the given AsciiString. The collection may reserve more space to avoid frequent reallocations.

Panics

Panics if the new capacity overflows usize.

Examples

let mut s = AsciiString::new();
s.reserve(10);
assert!(s.capacity() >= 10);

pub fn reserve_exact(&mut self, additional: usize)

Reserves the minimum capacity for exactly additional more bytes to be inserted in the given AsciiString. Does nothing if the capacity is already sufficient.

Note that the allocator may give the collection more space than it requests. Therefore capacity can not be relied upon to be precisely minimal. Prefer reserve if future insertions are expected.

Panics

Panics if the new capacity overflows usize.

Examples

let mut s = AsciiString::new();
s.reserve_exact(10);
assert!(s.capacity() >= 10);

pub fn shrink_to_fit(&mut self)

Shrinks the capacity of this ASCII string buffer to match it's length.

Examples

use std::str::FromStr;
let mut s = AsciiString::from_str("foo").unwrap();
s.reserve(100);
assert!(s.capacity() >= 100);
s.shrink_to_fit();
assert_eq!(s.capacity(), 3);

pub fn push(&mut self, ch: AsciiChar)

Adds the given ASCII character to the end of the ASCII string.

Examples

let mut s = AsciiString::from_ascii("abc").unwrap();
s.push(AsciiChar::from('1').unwrap());
s.push(AsciiChar::from('2').unwrap());
s.push(AsciiChar::from('3').unwrap());
assert_eq!(s, "abc123");

pub fn truncate(&mut self, new_len: usize)

Shortens a ASCII string to the specified length.

Panics

Panics if new_len > current length.

Examples

let mut s = AsciiString::from_ascii("hello").unwrap();
s.truncate(2);
assert_eq!(s, "he");

pub fn pop(&mut self) -> Option<AsciiChar>

Removes the last character from the ASCII string buffer and returns it. Returns None if this string buffer is empty.

Examples

let mut s = AsciiString::from_ascii("foo").unwrap();
assert_eq!(s.pop().map(|c| c.as_char()), Some('o'));
assert_eq!(s.pop().map(|c| c.as_char()), Some('o'));
assert_eq!(s.pop().map(|c| c.as_char()), Some('f'));
assert_eq!(s.pop(), None);

pub fn remove(&mut self, idx: usize) -> AsciiChar

Removes the ASCII character at position idx from the buffer and returns it.

Warning

This is an O(n) operation as it requires copying every element in the buffer.

Panics

If idx is out of bounds this function will panic.

Examples

let mut s = AsciiString::from_ascii("foo").unwrap();
assert_eq!(s.remove(0).as_char(), 'f');
assert_eq!(s.remove(1).as_char(), 'o');
assert_eq!(s.remove(0).as_char(), 'o');

pub fn insert(&mut self, idx: usize, ch: AsciiChar)

Inserts an ASCII character into the buffer at position idx.

Warning

This is an O(n) operation as it requires copying every element in the buffer.

Panics

If idx is out of bounds this function will panic.

Examples

let mut s = AsciiString::from_ascii("foo").unwrap();
s.insert(2, AsciiChar::b);
assert_eq!(s, "fobo");

pub fn len(&self) -> usize

Returns the number of bytes in this ASCII string.

Examples

let s = AsciiString::from_ascii("foo").unwrap();
assert_eq!(s.len(), 3);

pub fn is_empty(&self) -> bool

Returns true if the ASCII string contains zero bytes.

Examples

let mut s = AsciiString::new();
assert!(s.is_empty());
s.push(AsciiChar::from('a').unwrap());
assert!(!s.is_empty());

pub fn clear(&mut self)

Truncates the ASCII string, setting length (but not capacity) to zero.

Examples

let mut s = AsciiString::from_ascii("foo").unwrap();
s.clear();
assert!(s.is_empty());

Methods from Deref<Target = AsciiStr>

pub fn as_str(&self) -> &str

Converts &self to a &str slice.

pub fn as_bytes(&self) -> &[u8]

Converts &self into a byte slice.

pub fn as_slice(&self) -> &[AsciiChar]

Returns the entire string as slice of AsciiChars.

pub fn as_mut_slice(&mut self) -> &mut [AsciiChar]

Returns the entire string as mutable slice of AsciiChars.

pub fn as_ptr(&self) -> *const AsciiChar

Returns a raw pointer to the AsciiStr's buffer.

The caller must ensure that the slice outlives the pointer this function returns, or else it will end up pointing to garbage. Modifying the AsciiStr may cause it's buffer to be reallocated, which would also make any pointers to it invalid.

pub fn as_mut_ptr(&mut self) -> *mut AsciiChar

Returns an unsafe mutable pointer to the AsciiStr's buffer.

The caller must ensure that the slice outlives the pointer this function returns, or else it will end up pointing to garbage. Modifying the AsciiStr may cause it's buffer to be reallocated, which would also make any pointers to it invalid.

pub fn to_ascii_string(&self) -> AsciiString

Copies the content of this AsciiStr into an owned AsciiString.

pub fn len(&self) -> usize

Returns the number of characters / bytes in this ASCII sequence.

Examples

let s = AsciiStr::from_ascii("foo").unwrap();
assert_eq!(s.len(), 3);

pub fn is_empty(&self) -> bool

Returns true if the ASCII slice contains zero bytes.

Examples

let mut empty = AsciiStr::from_ascii("").unwrap();
let mut full = AsciiStr::from_ascii("foo").unwrap();
assert!(empty.is_empty());
assert!(!full.is_empty());

pub fn trim(&self) -> &Self

Returns an ASCII string slice with leading and trailing whitespace removed.

Examples

let example = AsciiStr::from_ascii("  \twhite \tspace  \t").unwrap();
assert_eq!("white \tspace", example.trim());

pub fn trim_left(&self) -> &Self

Returns an ASCII string slice with leading whitespace removed.

Examples

let example = AsciiStr::from_ascii("  \twhite \tspace  \t").unwrap();
assert_eq!("white \tspace  \t", example.trim_left());

pub fn trim_right(&self) -> &Self

Returns an ASCII string slice with trailing whitespace removed.

Examples

let example = AsciiStr::from_ascii("  \twhite \tspace  \t").unwrap();
assert_eq!("  \twhite \tspace", example.trim_right());

Trait Implementations

impl Clone for AsciiString

fn clone(&self) -> AsciiString

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Default for AsciiString

fn default() -> AsciiString

Returns the "default value" for a type.

impl PartialEq for AsciiString

fn eq(&self, __arg_0: &AsciiString) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, __arg_0: &AsciiString) -> bool

This method tests for !=.

impl Eq for AsciiString

impl PartialOrd for AsciiString

fn partial_cmp(&self, __arg_0: &AsciiString) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

fn lt(&self, __arg_0: &AsciiString) -> bool

This method tests less than (for self and other) and is used by the < operator.

fn le(&self, __arg_0: &AsciiString) -> bool

This method tests less than or equal to (for self and other) and is used by the <= operator.

fn gt(&self, __arg_0: &AsciiString) -> bool

This method tests greater than (for self and other) and is used by the > operator.

fn ge(&self, __arg_0: &AsciiString) -> bool

This method tests greater than or equal to (for self and other) and is used by the >= operator.

impl Ord for AsciiString

fn cmp(&self, __arg_0: &AsciiString) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

Compares and returns the minimum of two values.

impl Hash for AsciiString

fn hash<__H: Hasher>(&self, __arg_0: &mut __H)

Feeds this value into the given [Hasher].

fn hash_slice<H>(data: &[Self], state: &mut H) where
    H: Hasher, 

Feeds a slice of this type into the given [Hasher].

impl Deref for AsciiString

type Target = AsciiStr

The resulting type after dereferencing.

fn deref(&self) -> &AsciiStr

Dereferences the value.

impl DerefMut for AsciiString

fn deref_mut(&mut self) -> &mut AsciiStr

Mutably dereferences the value.

impl PartialEq<str> for AsciiString

fn eq(&self, other: &str) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

This method tests for !=.

impl PartialEq<AsciiString> for str

fn eq(&self, other: &AsciiString) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

This method tests for !=.

impl<'a> PartialEq<String> for AsciiString

fn eq(&self, other: &String) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &String) -> bool

This method tests for !=.

impl<'a> PartialEq<AsciiString> for String

fn eq(&self, other: &AsciiString) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &AsciiString) -> bool

This method tests for !=.

impl<'a> PartialEq<AsciiString> for &'a AsciiStr

fn eq(&self, other: &AsciiString) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &AsciiString) -> bool

This method tests for !=.

impl<'a> PartialEq<&'a AsciiStr> for AsciiString

fn eq(&self, other: &&'a AsciiStr) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &&'a AsciiStr) -> bool

This method tests for !=.

impl<'a> PartialEq<AsciiString> for &'a str

fn eq(&self, other: &AsciiString) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &AsciiString) -> bool

This method tests for !=.

impl<'a> PartialEq<&'a str> for AsciiString

fn eq(&self, other: &&'a str) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &&'a str) -> bool

This method tests for !=.

impl Borrow<AsciiStr> for AsciiString

fn borrow(&self) -> &AsciiStr

Immutably borrows from an owned value.

impl From<Vec<AsciiChar>> for AsciiString

fn from(vec: Vec<AsciiChar>) -> Self

Performs the conversion.

impl Into<Vec<u8>> for AsciiString

fn into(self) -> Vec<u8>

Performs the conversion.

impl Into<String> for AsciiString

fn into(self) -> String

Performs the conversion.

impl AsRef<AsciiStr> for AsciiString

fn as_ref(&self) -> &AsciiStr

Performs the conversion.

impl AsMut<AsciiStr> for AsciiString

fn as_mut(&mut self) -> &mut AsciiStr

Performs the conversion.

impl FromStr for AsciiString

type Err = AsAsciiStrError

The associated error which can be returned from parsing.

fn from_str(s: &str) -> Result<AsciiString, AsAsciiStrError>

Parses a string s to return a value of this type.

impl Display for AsciiString

fn fmt(&self, f: &mut Formatter) -> Result

Formats the value using the given formatter.

impl Debug for AsciiString

fn fmt(&self, f: &mut Formatter) -> Result

Formats the value using the given formatter.

impl FromIterator<AsciiChar> for AsciiString

fn from_iter<I: IntoIterator<Item = AsciiChar>>(iter: I) -> AsciiString

Creates a value from an iterator.

impl<'a> FromIterator<&'a AsciiStr> for AsciiString

fn from_iter<I: IntoIterator<Item = &'a AsciiStr>>(iter: I) -> AsciiString

Creates a value from an iterator.

impl Extend<AsciiChar> for AsciiString

fn extend<I: IntoIterator<Item = AsciiChar>>(&mut self, iterable: I)

Extends a collection with the contents of an iterator.

impl<'a> Extend<&'a AsciiChar> for AsciiString

fn extend<I: IntoIterator<Item = &'a AsciiChar>>(&mut self, iter: I)

Extends a collection with the contents of an iterator.

impl<'a> Extend<&'a AsciiStr> for AsciiString

fn extend<I: IntoIterator<Item = &'a AsciiStr>>(&mut self, iterable: I)

Extends a collection with the contents of an iterator.

impl<'a> Add<&'a AsciiStr> for AsciiString

type Output = AsciiString

The resulting type after applying the + operator.

fn add(self, other: &AsciiStr) -> AsciiString

Performs the + operation.

impl<T> Index<T> for AsciiString where
    AsciiStr: Index<T>, 

type Output = <AsciiStr as Index<T>>::Output

The returned type after indexing.

fn index(&self, index: T) -> &<AsciiStr as Index<T>>::Output

Performs the indexing (container[index]) operation.

impl<T> IndexMut<T> for AsciiString where
    AsciiStr: IndexMut<T>, 

fn index_mut(&mut self, index: T) -> &mut <AsciiStr as Index<T>>::Output

Performs the mutable indexing (container[index]) operation.

impl IntoAsciiString for AsciiString

unsafe fn into_ascii_string_unchecked(self) -> AsciiString

Convert to AsciiString without checking for non-ASCII characters.

fn into_ascii_string(self) -> Result<AsciiString, Self>

Convert to AsciiString.