DXR is a code search and navigation tool aimed at making sense of large projects. It supports full-text and regex searches as well as structural queries.

Mercurial (9596d7f4a745)

VCS Links

Line Code
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432
#![cfg_attr(test, deny(missing_docs))]
#![cfg_attr(test, deny(warnings))]
#![doc(html_root_url = "https://docs.rs/unicase/2.4.0")]
#![cfg_attr(feature = "nightly", feature(test))]

//! # UniCase
//!
//! UniCase provides a way of specifying strings that are case-insensitive.
//!
//! UniCase supports full [Unicode case
//! folding](https://www.w3.org/International/wiki/Case_folding). It can also
//! utilize faster ASCII case comparisons, if both strings are ASCII.
//!
//! Using the `UniCase::new()` constructor will check the string to see if it
//! is all ASCII. When a `UniCase` is compared against another, if both are
//! ASCII, it will use the faster comparison.
//!
//! There also exists the `Ascii` type in this crate, which will always assume
//! to use the ASCII case comparisons, if the encoding is already known.
//!
//! ## Example
//!
//! ```rust
//! use unicase::UniCase;
//!
//! let a = UniCase::new("Maße");
//! let b = UniCase::new("MASSE");
//! let c = UniCase::new("mase");
//!
//! assert_eq!(a, b);
//! assert!(b != c);
//! ```
//!
//! ## Ascii
//!
//! ```rust
//! use unicase::Ascii;
//!
//! let a = Ascii::new("foobar");
//! let b = Ascii::new("FoObAr");
//!
//! assert_eq!(a, b);
//! ```

#[cfg(feature = "nightly")]
extern crate test;

use std::borrow::Cow;
#[cfg(__unicase__iter_cmp)]
use std::cmp::Ordering;
use std::fmt;
use std::hash::{Hash, Hasher};
use std::ops::{Deref, DerefMut};
use std::str::FromStr;

use self::unicode::Unicode;

mod ascii;
mod unicode;

/// Case Insensitive wrapper of strings.
#[derive(Clone, Copy)]
pub struct UniCase<S>(Encoding<S>);

/// Case Insensitive wrapper of Ascii strings.
#[derive(Clone, Copy, Debug, Default)]
pub struct Ascii<S>(S);

/// Compare two string-like types for case-less equality, using unicode folding.
///
/// Equivalent to `UniCase::new(left) == UniCase::new(right)`.
///
/// Note: This will perform a scan for ASCII characters before doing the
/// the comparison. See `UniCase` for more information.
#[inline]
pub fn eq<S: AsRef<str> + ?Sized>(left: &S, right: &S) -> bool {
    UniCase::new(left) == UniCase::new(right)
}

/// Compare two string-like types for case-less equality, ignoring ASCII case.
///
/// Equivalent to `Ascii::new(left) == Ascii::new(right)`.
#[inline]
pub fn eq_ascii<S: AsRef<str> + ?Sized>(left: &S, right: &S) -> bool {
    Ascii(left) == Ascii(right)
}

#[derive(Clone, Copy, Debug)]
enum Encoding<S> {
    Ascii(Ascii<S>),
    Unicode(Unicode<S>),
}

macro_rules! inner {

    (mut $e:expr) => ({
        match &mut $e {
            &mut Encoding::Ascii(ref mut s) => &mut s.0,
            &mut Encoding::Unicode(ref mut s) => &mut s.0,
        }
    });
    ($e:expr) => ({
        match &$e {
            &Encoding::Ascii(ref s) => &s.0,
            &Encoding::Unicode(ref s) => &s.0,
        }
    });
}

impl<S: AsRef<str> + Default> Default for UniCase<S> {
    fn default() -> Self {
        Self::new(Default::default())
    }
}

impl<S: AsRef<str>> UniCase<S> {
    /// Creates a new `UniCase`.
    ///
    /// Note: This scans the text to determine if it is all ASCII or not.
    pub fn new(s: S) -> UniCase<S> {
        #[allow(deprecated, unused)]
        use std::ascii::AsciiExt;
        if s.as_ref().is_ascii() {
            UniCase(Encoding::Ascii(Ascii(s)))
        } else {
            UniCase(Encoding::Unicode(Unicode(s)))
        }
    }
}

impl<S> UniCase<S> {
    /// Creates a new `UniCase`, skipping the ASCII check.
    #[cfg(__unicase__const_fns)]
    pub const fn unicode(s: S) -> UniCase<S> {
        UniCase(Encoding::Unicode(Unicode(s)))
    }

    /// Creates a new `UniCase`, skipping the ASCII check.
    ///
    /// For Rust versions >= 1.31, this is a `const fn`.
    #[cfg(not(__unicase__const_fns))]
    pub fn unicode(s: S) -> UniCase<S> {
        UniCase(Encoding::Unicode(Unicode(s)))
    }

    /// Creates a new `UniCase` which performs only ASCII case folding.
    #[cfg(__unicase__const_fns)]
    pub const fn ascii(s: S) -> UniCase<S> {
        UniCase(Encoding::Ascii(Ascii(s)))
    }

    /// Creates a new `UniCase` which performs only ASCII case folding.
    ///
    /// For Rust versions >= 1.31, this is a `const fn`.
    #[cfg(not(__unicase__const_fns))]
    pub fn ascii(s: S) -> UniCase<S> {
        UniCase(Encoding::Ascii(Ascii(s)))
    }

    /// Return `true` if this instance will only perform ASCII case folding.
    pub fn is_ascii(&self) -> bool {
        match self.0 {
            Encoding::Ascii(_) => true,
            Encoding::Unicode(_) => false,
        }
    }

    /// Unwraps the inner value held by this `UniCase`.
    #[inline]
    pub fn into_inner(self) -> S {
        match self.0 {
            Encoding::Ascii(s) => s.0,
            Encoding::Unicode(s) => s.0,
        }
    }
}

impl<S> Deref for UniCase<S> {
    type Target = S;
    #[inline]
    fn deref<'a>(&'a self) -> &'a S {
        inner!(self.0)
    }
}

impl<S> DerefMut for UniCase<S> {
    #[inline]
    fn deref_mut<'a>(&'a mut self) -> &'a mut S {
        inner!(mut self.0)
    }
}

impl<S: AsRef<str>> AsRef<str> for UniCase<S> {
    #[inline]
    fn as_ref(&self) -> &str {
        inner!(self.0).as_ref()
    }

}

impl<S: fmt::Debug> fmt::Debug for UniCase<S> {
    #[inline]
    fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
        fmt::Debug::fmt(inner!(self.0), fmt)
    }
}

impl<S: fmt::Display> fmt::Display for UniCase<S> {
    #[inline]
    fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
        fmt::Display::fmt(inner!(self.0), fmt)
    }
}


impl<S1: AsRef<str>, S2: AsRef<str>> PartialEq<UniCase<S2>> for UniCase<S1> {
    #[inline]
    fn eq(&self, other: &UniCase<S2>) -> bool {
        match (&self.0, &other.0) {
            (&Encoding::Ascii(ref x), &Encoding::Ascii(ref y)) => x == y,
            (&Encoding::Unicode(ref x), &Encoding::Unicode(ref y)) => x == y,
            (&Encoding::Ascii(ref x), &Encoding::Unicode(ref y)) => &Unicode(x.as_ref()) == y,
            (&Encoding::Unicode(ref x), &Encoding::Ascii(ref y)) => x == &Unicode(y.as_ref()),
        }
    }
}

impl<S: AsRef<str>> Eq for UniCase<S> {}

impl<S: AsRef<str>> Hash for UniCase<S> {
    #[inline]
    fn hash<H: Hasher>(&self, hasher: &mut H) {
        match self.0 {
            Encoding::Ascii(ref s) => s.hash(hasher),
            Encoding::Unicode(ref s) => s.hash(hasher)
        }
    }
}

impl<S> From<Ascii<S>> for UniCase<S> {
    fn from(ascii: Ascii<S>) -> Self {
        UniCase(Encoding::Ascii(ascii))
    }
}

macro_rules! from_impl {
    ($from:ty => $to:ty; $by:ident) => (
        impl<'a> From<$from> for UniCase<$to> {
            fn from(s: $from) -> Self {
                UniCase::unicode(s.$by())
            }
        }
    );
    ($from:ty => $to:ty) => ( from_impl!($from => $to; into); )
}

macro_rules! into_impl {
    ($to:ty) => (
        impl<'a> Into<$to> for UniCase<$to> {
            fn into(self) -> $to {
                self.into_inner()
            }
        }
    );
}

impl<S: AsRef<str>> From<S> for UniCase<S> {
    fn from(s: S) -> Self {
        UniCase::unicode(s)
    }
}

from_impl!(&'a str => Cow<'a, str>);
from_impl!(String => Cow<'a, str>);
from_impl!(&'a str => String);
from_impl!(Cow<'a, str> => String; into_owned);
from_impl!(&'a String => &'a str; as_ref);

into_impl!(&'a str);
into_impl!(String);
into_impl!(Cow<'a, str>);

#[cfg(__unicase__iter_cmp)]
impl<T: AsRef<str>> PartialOrd for UniCase<T> {
    #[inline]
    fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
        Some(self.cmp(other))
    }
}

#[cfg(__unicase__iter_cmp)]
impl<T: AsRef<str>> Ord for UniCase<T> {
    #[inline]
    fn cmp(&self, other: &Self) -> Ordering {
        match (&self.0, &other.0) {
            (&Encoding::Ascii(ref x), &Encoding::Ascii(ref y)) => x.cmp(y),
            (&Encoding::Unicode(ref x), &Encoding::Unicode(ref y)) => x.cmp(y),
            (&Encoding::Ascii(ref x), &Encoding::Unicode(ref y)) => Unicode(x.as_ref()).cmp(&Unicode(y.0.as_ref())),
            (&Encoding::Unicode(ref x), &Encoding::Ascii(ref y)) => Unicode(x.0.as_ref()).cmp(&Unicode(y.as_ref())),
        }
    }
}



impl<S: FromStr + AsRef<str>> FromStr for UniCase<S> {
    type Err = <S as FromStr>::Err;
    fn from_str(s: &str) -> Result<UniCase<S>, Self::Err> {
        s.parse().map(UniCase::new)
    }
}

#[cfg(test)]
mod tests {
    use super::UniCase;
    use std::hash::{Hash, Hasher};
    #[cfg(not(__unicase__default_hasher))]
    use std::hash::SipHasher as DefaultHasher;
    #[cfg(__unicase__default_hasher)]
    use std::collections::hash_map::DefaultHasher;

    fn hash<T: Hash>(t: &T) -> u64 {
        let mut s = DefaultHasher::new();
        t.hash(&mut s);
        s.finish()
    }

    #[test]
    fn test_copy_for_refs() {
        fn foo<T>(_: UniCase<T>) {}

        let a = UniCase::new("foobar");
        foo(a);
        foo(a);
    }

    #[test]
    fn test_eq_ascii() {
        let a = UniCase::new("foobar");
        let b = UniCase::new("FOOBAR");
        let c = UniCase::ascii("FoObAr");

        assert_eq!(a, b);
        assert_eq!(a, c);
        assert_eq!(hash(&a), hash(&b));
        assert_eq!(hash(&a), hash(&c));
        assert!(a.is_ascii());
        assert!(b.is_ascii());
        assert!(c.is_ascii());
    }

    #[test]
    fn test_eq_unicode() {
        let a = UniCase::new("στιγμας");
        let b = UniCase::new("στιγμασ");
        assert_eq!(a, b);
        assert_eq!(hash(&a), hash(&b));
    }

    #[cfg(feature = "nightly")]
    #[bench]
    fn bench_unicase_ascii(b: &mut ::test::Bencher) {
        b.bytes = b"foobar".len() as u64;
        let x = UniCase::new("foobar");
        let y = UniCase::new("FOOBAR");
        b.iter(|| assert_eq!(x, y));
    }

    #[cfg(feature = "nightly")]
    static SUBJECT: &'static [u8] = b"ffoo bar baz foo bar baz foo bar baz foo bar baz foo bar baz foo bar baz foo bar baz foo bar baz foo bar baz foo bar baz foo bar baz foo bar baz foo bar baz foo bar baz foo bar baz foo bar baz foo bar baz foo bar baz foo bar baz foo bar baz foo bar baz foo bar baz foo bar baz foo bar baz foo bar baz foo bar baz foo bar baz foo bar baz foo bar baz foo bar baz foo bar baz foo bar baz foo bar baz foo bar baz foo bar baz foo bar baz foo bar baz foo bar baz foo bar baz foo bar baz foo bar baz foo bar baz foo bar baz foo bar baz foo bar baz foo bar baz foo bar baz foo bar baz foo bar baz foo bar baz foo bar baz foo bar baz foo bar baz foo bar baz foo bar baz foo bar baz foo bar baz oo bar baz quux herp derp";

    #[cfg(feature = "nightly")]
    #[inline(never)]
    fn is_ascii(bytes: &[u8]) -> bool {
        #[allow(unused, deprecated)]
        use std::ascii::AsciiExt;
        bytes.is_ascii()
    }

    #[cfg(feature = "nightly")]
    #[bench]
    fn bench_is_ascii(b: &mut ::test::Bencher) {
        b.iter(|| assert!(is_ascii(SUBJECT)));
    }

    #[cfg(feature = "nightly")]
    #[bench]
    fn bench_is_utf8(b: &mut ::test::Bencher) {
        b.iter(|| assert!(::std::str::from_utf8(SUBJECT).is_ok()));
    }

    #[cfg(__unicase__iter_cmp)]
    #[test]
    fn test_case_cmp() {
        assert!(UniCase::new("a") < UniCase::new("B"));

        assert!(UniCase::new("A") < UniCase::new("b"));
        assert!(UniCase::new("aa") > UniCase::new("a"));

        assert!(UniCase::new("a") < UniCase::new("aa"));
        assert!(UniCase::new("a") < UniCase::new("AA"));
    }

    #[test]
    fn test_from_impls() {
        let view: &'static str = "foobar";
        let _: UniCase<&'static str> = view.into();
        let _: UniCase<&str> = view.into();
        let _: UniCase<String> = view.into();

        let owned: String = view.to_owned();
        let _: UniCase<&str> = (&owned).into();
        let _: UniCase<String> = owned.into();
    }

    #[test]
    fn test_into_impls() {
        let view: UniCase<&'static str> = UniCase::new("foobar");
        let _: &'static str = view.into();
        let _: &str = view.into();

        let owned: UniCase<String> = "foobar".into();
        let _: String = owned.clone().into();
        let _: &str = owned.as_ref();
    }

    #[cfg(__unicase__const_fns)]
    #[test]
    fn test_unicase_unicode_const() {
        const _UNICASE: UniCase<&'static str> = UniCase::unicode("");
    }
}