Trait inlinable_string::string_ext::StringExt [−] [src]

pub trait StringExt<'a>: Borrow<str> + Display + PartialEq<str> + PartialEq<&'a str> + PartialEq<String> + PartialEq<Cow<'a, str>> {
    fn new() -> Self where Self: Sized;
    fn with_capacity(capacity: usize) -> Self where Self: Sized;
    fn from_utf8(vec: Vec<u8>) -> Result<Self, FromUtf8Error> where Self: Sized;
    fn from_utf16(v: &[u16]) -> Result<Self, FromUtf16Error> where Self: Sized;
    fn from_utf16_lossy(v: &[u16]) -> Self where Self: Sized;
    unsafe fn from_raw_parts(buf: *mut u8, length: usize, capacity: usize) -> Self where Self: Sized;
    unsafe fn from_utf8_unchecked(bytes: Vec<u8>) -> Self where Self: Sized;
    fn into_bytes(self) -> Vec<u8>;
    fn push_str(&mut self, string: &str);
    fn capacity(&self) -> usize;
    fn reserve(&mut self, additional: usize);
    fn reserve_exact(&mut self, additional: usize);
    fn shrink_to_fit(&mut self);
    fn push(&mut self, ch: char);
    fn as_bytes(&self) -> &[u8];
    fn truncate(&mut self, new_len: usize);
    fn pop(&mut self) -> Option<char>;
    fn remove(&mut self, idx: usize) -> char;
    fn insert(&mut self, idx: usize, ch: char);
    unsafe fn as_mut_slice(&mut self) -> &mut [u8];
    fn len(&self) -> usize;

    fn from_utf8_lossy(v: &'a [u8]) -> Cow<'a, str> where Self: Sized { ... }
    fn is_empty(&self) -> bool { ... }
    fn clear(&mut self) { ... }
}

A trait that exists to abstract string operations over any number of concrete string type implementations.

See the crate level documentation for more.

Required Methods

fn new() -> Self where Self: Sized

Creates a new string buffer initialized with the empty string.

Examples

use inlinable_string::{InlinableString, StringExt};

let s = InlinableString::new();

fn with_capacity(capacity: usize) -> Self where Self: Sized

Creates a new string buffer with the given capacity. The string will be able to hold at least capacity bytes without reallocating. If capacity is less than or equal to INLINE_STRING_CAPACITY, the string will not heap allocate.

Examples

use inlinable_string::{InlinableString, StringExt};

let s = InlinableString::with_capacity(10);

fn from_utf8(vec: Vec<u8>) -> Result<Self, FromUtf8Error> where Self: Sized

Returns the vector as a string buffer, if possible, taking care not to copy it.

Failure

If the given vector is not valid UTF-8, then the original vector and the corresponding error is returned.

Examples

use inlinable_string::{InlinableString, StringExt};

let hello_vec = vec![104, 101, 108, 108, 111];
let s = InlinableString::from_utf8(hello_vec).unwrap();
assert_eq!(s, "hello");

let invalid_vec = vec![240, 144, 128];
let s = InlinableString::from_utf8(invalid_vec).err().unwrap();
let err = s.utf8_error();
assert_eq!(s.into_bytes(), [240, 144, 128]);

fn from_utf16(v: &[u16]) -> Result<Self, FromUtf16Error> where Self: Sized

Decode a UTF-16 encoded vector v into a InlinableString, returning None if v contains any invalid data.

Examples

use inlinable_string::{InlinableString, StringExt};

// 𝄞music
let mut v = &mut [0xD834, 0xDD1E, 0x006d, 0x0075,
                  0x0073, 0x0069, 0x0063];
assert_eq!(InlinableString::from_utf16(v).unwrap(),
           InlinableString::from("𝄞music"));

// 𝄞mu<invalid>ic
v[4] = 0xD800;
assert!(InlinableString::from_utf16(v).is_err());

fn from_utf16_lossy(v: &[u16]) -> Self where Self: Sized

Decode a UTF-16 encoded vector v into a string, replacing invalid data with the replacement character (U+FFFD).

Examples

use inlinable_string::{InlinableString, StringExt};

// 𝄞mus<invalid>ic<invalid>
let v = &[0xD834, 0xDD1E, 0x006d, 0x0075,
          0x0073, 0xDD1E, 0x0069, 0x0063,
          0xD834];

assert_eq!(InlinableString::from_utf16_lossy(v),
           InlinableString::from("𝄞mus\u{FFFD}ic\u{FFFD}"));

unsafe fn from_raw_parts(buf: *mut u8, length: usize, capacity: usize) -> Self where Self: Sized

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

Unsafety

This is very unsafe because:

  • We call String::from_raw_parts to get a Vec<u8>. Therefore, this function inherits all of its unsafety, see its documentation for the invariants it expects, they also apply to this function.

  • We assume that the Vec contains valid UTF-8.

unsafe fn from_utf8_unchecked(bytes: Vec<u8>) -> Self where Self: Sized

Converts a vector of bytes to a new InlinableString without checking if it contains valid UTF-8. This is unsafe because it assumes that the UTF-8-ness of the vector has already been validated.

fn into_bytes(self) -> Vec<u8>

Returns the underlying byte buffer, encoded as UTF-8.

Examples

use inlinable_string::{InlinableString, StringExt};

let s = InlinableString::from("hello");
let bytes = s.into_bytes();
assert_eq!(bytes, [104, 101, 108, 108, 111]);

fn push_str(&mut self, string: &str)

Pushes the given string onto this string buffer.

Examples

use inlinable_string::{InlinableString, StringExt};

let mut s = InlinableString::from("foo");
s.push_str("bar");
assert_eq!(s, "foobar");

fn capacity(&self) -> usize

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

Examples

use inlinable_string::{InlinableString, StringExt};

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

fn reserve(&mut self, additional: usize)

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

Panics

Panics if the new capacity overflows usize.

Examples

use inlinable_string::{InlinableString, StringExt};

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

fn reserve_exact(&mut self, additional: usize)

Reserves the minimum capacity for exactly additional more bytes to be inserted in the given InlinableString. 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

use inlinable_string::{InlinableString, StringExt};

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

fn shrink_to_fit(&mut self)

Shrinks the capacity of this string buffer to match its length. If the string's length is less than INLINE_STRING_CAPACITY and the string is heap-allocated, then it is demoted to inline storage.

Examples

use inlinable_string::{InlinableString, StringExt};

let mut s = InlinableString::from("foo");
s.reserve(100);
assert!(s.capacity() >= 100);
s.shrink_to_fit();
assert_eq!(s.capacity(), inlinable_string::INLINE_STRING_CAPACITY);

fn push(&mut self, ch: char)

Adds the given character to the end of the string.

Examples

use inlinable_string::{InlinableString, StringExt};

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

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

Works with the underlying buffer as a byte slice.

Examples

use inlinable_string::{InlinableString, StringExt};

let s = InlinableString::from("hello");
assert_eq!(s.as_bytes(), [104, 101, 108, 108, 111]);

fn truncate(&mut self, new_len: usize)

Shortens a string to the specified length.

Panics

Panics if new_len > current length, or if new_len is not a character boundary.

Examples

use inlinable_string::{InlinableString, StringExt};

let mut s = InlinableString::from("hello");
s.truncate(2);
assert_eq!(s, "he");

fn pop(&mut self) -> Option<char>

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

Examples

use inlinable_string::{InlinableString, StringExt};

let mut s = InlinableString::from("foo");
assert_eq!(s.pop(), Some('o'));
assert_eq!(s.pop(), Some('o'));
assert_eq!(s.pop(), Some('f'));
assert_eq!(s.pop(), None);

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

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

Warning

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

Panics

If idx does not lie on a character boundary, or if it is out of bounds, then this function will panic.

Examples

use inlinable_string::{InlinableString, StringExt};

let mut s = InlinableString::from("foo");
assert_eq!(s.remove(0), 'f');
assert_eq!(s.remove(1), 'o');
assert_eq!(s.remove(0), 'o');

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

Inserts a character into the string buffer at byte position idx.

Warning

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

Examples

use inlinable_string::{InlinableString, StringExt};

let mut s = InlinableString::from("foo");
s.insert(2, 'f');
assert!(s == "fofo");

Panics

If idx does not lie on a character boundary or is out of bounds, then this function will panic.

unsafe fn as_mut_slice(&mut self) -> &mut [u8]

Views the string buffer as a mutable sequence of bytes.

This is unsafe because it does not check to ensure that the resulting string will be valid UTF-8.

Examples

use inlinable_string::{InlinableString, StringExt};

let mut s = InlinableString::from("hello");
unsafe {
    let slice = s.as_mut_slice();
    assert!(slice == &[104, 101, 108, 108, 111]);
    slice.reverse();
}
assert_eq!(s, "olleh");

fn len(&self) -> usize

Returns the number of bytes in this string.

Examples

use inlinable_string::{InlinableString, StringExt};

let a = InlinableString::from("foo");
assert_eq!(a.len(), 3);

Provided Methods

fn from_utf8_lossy(v: &'a [u8]) -> Cow<'a, str> where Self: Sized

Converts a vector of bytes to a new UTF-8 string. Any invalid UTF-8 sequences are replaced with U+FFFD REPLACEMENT CHARACTER.

Examples

use inlinable_string::{InlinableString, StringExt};

let input = b"Hello \xF0\x90\x80World";
let output = InlinableString::from_utf8_lossy(input);
assert_eq!(output, "Hello \u{FFFD}World");

fn is_empty(&self) -> bool

Returns true if the string contains no bytes

Examples

use inlinable_string::{InlinableString, StringExt};

let mut v = InlinableString::new();
assert!(v.is_empty());
v.push('a');
assert!(!v.is_empty());

fn clear(&mut self)

Truncates the string, returning it to 0 length.

Examples

use inlinable_string::{InlinableString, StringExt};

let mut s = InlinableString::from("foo");
s.clear();
assert!(s.is_empty());

Implementors