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Diffstat (limited to 'src/libstd/ascii.rs')
| -rw-r--r-- | src/libstd/ascii.rs | 582 |
1 files changed, 582 insertions, 0 deletions
diff --git a/src/libstd/ascii.rs b/src/libstd/ascii.rs new file mode 100644 index 00000000000..ec2d7566177 --- /dev/null +++ b/src/libstd/ascii.rs @@ -0,0 +1,582 @@ +// Copyright 2013 The Rust Project Developers. See the COPYRIGHT +// file at the top-level directory of this distribution and at +// http://rust-lang.org/COPYRIGHT. +// +// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or +// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license +// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your +// option. This file may not be copied, modified, or distributed +// except according to those terms. + +//! Operations on ASCII strings and characters. + +use to_str::{ToStr,ToStrConsume}; +use str; +use str::StrSlice; +use str::OwnedStr; +use container::Container; +use cast; +use iter::Iterator; +use vec::{CopyableVector, ImmutableVector, MutableVector}; +use to_bytes::IterBytes; +use option::{Some, None}; + +/// Datatype to hold one ascii character. It wraps a `u8`, with the highest bit always zero. +#[deriving(Clone, Eq, Ord, TotalOrd, TotalEq)] +pub struct Ascii { priv chr: u8 } + +impl Ascii { + /// Converts a ascii character into a `u8`. + #[inline] + pub fn to_byte(self) -> u8 { + self.chr + } + + /// Converts a ascii character into a `char`. + #[inline] + pub fn to_char(self) -> char { + self.chr as char + } + + /// Convert to lowercase. + #[inline] + pub fn to_lower(self) -> Ascii { + Ascii{chr: ASCII_LOWER_MAP[self.chr]} + } + + /// Convert to uppercase. + #[inline] + pub fn to_upper(self) -> Ascii { + Ascii{chr: ASCII_UPPER_MAP[self.chr]} + } + + /// Compares two ascii characters of equality, ignoring case. + #[inline] + pub fn eq_ignore_case(self, other: Ascii) -> bool { + ASCII_LOWER_MAP[self.chr] == ASCII_LOWER_MAP[other.chr] + } +} + +impl ToStr for Ascii { + #[inline] + fn to_str(&self) -> ~str { + // self.chr is always a valid utf8 byte, no need for the check + unsafe { str::raw::from_byte(self.chr) } + } +} + +/// Trait for converting into an ascii type. +pub trait AsciiCast<T> { + /// Convert to an ascii type + fn to_ascii(&self) -> T; + + /// Convert to an ascii type, not doing any range asserts + unsafe fn to_ascii_nocheck(&self) -> T; + + /// Check if convertible to ascii + fn is_ascii(&self) -> bool; +} + +impl<'self> AsciiCast<&'self[Ascii]> for &'self [u8] { + #[inline] + fn to_ascii(&self) -> &'self[Ascii] { + assert!(self.is_ascii()); + unsafe {self.to_ascii_nocheck()} + } + + #[inline] + unsafe fn to_ascii_nocheck(&self) -> &'self[Ascii] { + cast::transmute(*self) + } + + #[inline] + fn is_ascii(&self) -> bool { + for b in self.iter() { + if !b.is_ascii() { return false; } + } + true + } +} + +impl<'self> AsciiCast<&'self [Ascii]> for &'self str { + #[inline] + fn to_ascii(&self) -> &'self [Ascii] { + assert!(self.is_ascii()); + unsafe { self.to_ascii_nocheck() } + } + + #[inline] + unsafe fn to_ascii_nocheck(&self) -> &'self [Ascii] { + cast::transmute(*self) + } + + #[inline] + fn is_ascii(&self) -> bool { + self.byte_iter().all(|b| b.is_ascii()) + } +} + +impl AsciiCast<Ascii> for u8 { + #[inline] + fn to_ascii(&self) -> Ascii { + assert!(self.is_ascii()); + unsafe {self.to_ascii_nocheck()} + } + + #[inline] + unsafe fn to_ascii_nocheck(&self) -> Ascii { + Ascii{ chr: *self } + } + + #[inline] + fn is_ascii(&self) -> bool { + *self & 128 == 0u8 + } +} + +impl AsciiCast<Ascii> for char { + #[inline] + fn to_ascii(&self) -> Ascii { + assert!(self.is_ascii()); + unsafe {self.to_ascii_nocheck()} + } + + #[inline] + unsafe fn to_ascii_nocheck(&self) -> Ascii { + Ascii{ chr: *self as u8 } + } + + #[inline] + fn is_ascii(&self) -> bool { + *self as u32 - ('\x7F' as u32 & *self as u32) == 0 + } +} + +/// Trait for copyless casting to an ascii vector. +pub trait OwnedAsciiCast { + /// Take ownership and cast to an ascii vector without trailing zero element. + fn into_ascii(self) -> ~[Ascii]; + + /// Take ownership and cast to an ascii vector without trailing zero element. + /// Does not perform validation checks. + unsafe fn into_ascii_nocheck(self) -> ~[Ascii]; +} + +impl OwnedAsciiCast for ~[u8] { + #[inline] + fn into_ascii(self) -> ~[Ascii] { + assert!(self.is_ascii()); + unsafe {self.into_ascii_nocheck()} + } + + #[inline] + unsafe fn into_ascii_nocheck(self) -> ~[Ascii] { + cast::transmute(self) + } +} + +impl OwnedAsciiCast for ~str { + #[inline] + fn into_ascii(self) -> ~[Ascii] { + assert!(self.is_ascii()); + unsafe {self.into_ascii_nocheck()} + } + + #[inline] + unsafe fn into_ascii_nocheck(self) -> ~[Ascii] { + cast::transmute(self) + } +} + +/// Trait for converting an ascii type to a string. Needed to convert `&[Ascii]` to `~str` +pub trait AsciiStr { + /// Convert to a string. + fn to_str_ascii(&self) -> ~str; + + /// Convert to vector representing a lower cased ascii string. + fn to_lower(&self) -> ~[Ascii]; + + /// Convert to vector representing a upper cased ascii string. + fn to_upper(&self) -> ~[Ascii]; + + /// Compares two Ascii strings ignoring case + fn eq_ignore_case(self, other: &[Ascii]) -> bool; +} + +impl<'self> AsciiStr for &'self [Ascii] { + #[inline] + fn to_str_ascii(&self) -> ~str { + let cpy = self.to_owned(); + unsafe { cast::transmute(cpy) } + } + + #[inline] + fn to_lower(&self) -> ~[Ascii] { + self.map(|a| a.to_lower()) + } + + #[inline] + fn to_upper(&self) -> ~[Ascii] { + self.map(|a| a.to_upper()) + } + + #[inline] + fn eq_ignore_case(self, other: &[Ascii]) -> bool { + do self.iter().zip(other.iter()).all |(&a, &b)| { a.eq_ignore_case(b) } + } +} + +impl ToStrConsume for ~[Ascii] { + #[inline] + fn into_str(self) -> ~str { + unsafe { cast::transmute(self) } + } +} + +impl IterBytes for Ascii { + #[inline] + fn iter_bytes(&self, _lsb0: bool, f: &fn(buf: &[u8]) -> bool) -> bool { + f([self.to_byte()]) + } +} + +/// Trait to convert to a owned byte array by consuming self +pub trait ToBytesConsume { + /// Converts to a owned byte array by consuming self + fn into_bytes(self) -> ~[u8]; +} + +impl ToBytesConsume for ~[Ascii] { + fn into_bytes(self) -> ~[u8] { + unsafe { cast::transmute(self) } + } +} + +/// Extension methods for ASCII-subset only operations on owned strings +pub trait OwnedStrAsciiExt { + /// Convert the string to ASCII upper case: + /// ASCII letters 'a' to 'z' are mapped to 'A' to 'Z', + /// but non-ASCII letters are unchanged. + fn into_ascii_upper(self) -> ~str; + + /// Convert the string to ASCII lower case: + /// ASCII letters 'A' to 'Z' are mapped to 'a' to 'z', + /// but non-ASCII letters are unchanged. + fn into_ascii_lower(self) -> ~str; +} + +/// Extension methods for ASCII-subset only operations on string slices +pub trait StrAsciiExt { + /// Makes a copy of the string in ASCII upper case: + /// ASCII letters 'a' to 'z' are mapped to 'A' to 'Z', + /// but non-ASCII letters are unchanged. + fn to_ascii_upper(&self) -> ~str; + + /// Makes a copy of the string in ASCII lower case: + /// ASCII letters 'A' to 'Z' are mapped to 'a' to 'z', + /// but non-ASCII letters are unchanged. + fn to_ascii_lower(&self) -> ~str; + + /// Check that two strings are an ASCII case-insensitive match. + /// Same as `to_ascii_lower(a) == to_ascii_lower(b)`, + /// but without allocating and copying temporary strings. + fn eq_ignore_ascii_case(&self, other: &str) -> bool; +} + +impl<'self> StrAsciiExt for &'self str { + #[inline] + fn to_ascii_upper(&self) -> ~str { + unsafe { str_copy_map_bytes(*self, ASCII_UPPER_MAP) } + } + + #[inline] + fn to_ascii_lower(&self) -> ~str { + unsafe { str_copy_map_bytes(*self, ASCII_LOWER_MAP) } + } + + #[inline] + fn eq_ignore_ascii_case(&self, other: &str) -> bool { + self.len() == other.len() && self.as_bytes().iter().zip(other.as_bytes().iter()).all( + |(byte_self, byte_other)| ASCII_LOWER_MAP[*byte_self] == ASCII_LOWER_MAP[*byte_other]) + } +} + +impl OwnedStrAsciiExt for ~str { + #[inline] + fn into_ascii_upper(self) -> ~str { + unsafe { str_map_bytes(self, ASCII_UPPER_MAP) } + } + + #[inline] + fn into_ascii_lower(self) -> ~str { + unsafe { str_map_bytes(self, ASCII_LOWER_MAP) } + } +} + +#[inline] +unsafe fn str_map_bytes(string: ~str, map: &'static [u8]) -> ~str { + let mut bytes = string.into_bytes(); + + for b in bytes.mut_iter() { + *b = map[*b]; + } + + str::raw::from_utf8_owned(bytes) +} + +#[inline] +unsafe fn str_copy_map_bytes(string: &str, map: &'static [u8]) -> ~str { + let bytes = string.byte_iter().map(|b| map[b]).to_owned_vec(); + + str::raw::from_utf8_owned(bytes) +} + +static ASCII_LOWER_MAP: &'static [u8] = &[ + 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, + 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, + 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, + 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, + 0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, + 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, + 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, + 0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f, + 0x40, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, + 0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, + 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, + 0x78, 0x79, 0x7a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f, + 0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, + 0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, + 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, + 0x78, 0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, + 0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, + 0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f, + 0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, + 0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f, + 0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, + 0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf, + 0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7, + 0xb8, 0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe, 0xbf, + 0xc0, 0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7, + 0xc8, 0xc9, 0xca, 0xcb, 0xcc, 0xcd, 0xce, 0xcf, + 0xd0, 0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, + 0xd8, 0xd9, 0xda, 0xdb, 0xdc, 0xdd, 0xde, 0xdf, + 0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, + 0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef, + 0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, + 0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff, +]; + +static ASCII_UPPER_MAP: &'static [u8] = &[ + 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, + 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, + 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, + 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, + 0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, + 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, + 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, + 0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f, + 0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, + 0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f, + 0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, + 0x58, 0x59, 0x5a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f, + 0x60, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, + 0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f, + 0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, + 0x58, 0x59, 0x5a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, + 0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, + 0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f, + 0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, + 0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f, + 0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, + 0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf, + 0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7, + 0xb8, 0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe, 0xbf, + 0xc0, 0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7, + 0xc8, 0xc9, 0xca, 0xcb, 0xcc, 0xcd, 0xce, 0xcf, + 0xd0, 0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, + 0xd8, 0xd9, 0xda, 0xdb, 0xdc, 0xdd, 0xde, 0xdf, + 0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, + 0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef, + 0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, + 0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff, +]; + + +#[cfg(test)] +mod tests { + use super::*; + use str::from_char; + use char::from_u32; + + macro_rules! v2ascii ( + ( [$($e:expr),*]) => ( [$(Ascii{chr:$e}),*]); + (~[$($e:expr),*]) => (~[$(Ascii{chr:$e}),*]); + ) + + #[test] + fn test_ascii() { + assert_eq!(65u8.to_ascii().to_byte(), 65u8); + assert_eq!(65u8.to_ascii().to_char(), 'A'); + assert_eq!('A'.to_ascii().to_char(), 'A'); + assert_eq!('A'.to_ascii().to_byte(), 65u8); + + assert_eq!('A'.to_ascii().to_lower().to_char(), 'a'); + assert_eq!('Z'.to_ascii().to_lower().to_char(), 'z'); + assert_eq!('a'.to_ascii().to_upper().to_char(), 'A'); + assert_eq!('z'.to_ascii().to_upper().to_char(), 'Z'); + + assert_eq!('@'.to_ascii().to_lower().to_char(), '@'); + assert_eq!('['.to_ascii().to_lower().to_char(), '['); + assert_eq!('`'.to_ascii().to_upper().to_char(), '`'); + assert_eq!('{'.to_ascii().to_upper().to_char(), '{'); + + assert!("banana".iter().all(|c| c.is_ascii())); + assert!(!"ประเทศไทย中华Việt Nam".iter().all(|c| c.is_ascii())); + } + + #[test] + fn test_ascii_vec() { + assert_eq!((&[40u8, 32u8, 59u8]).to_ascii(), v2ascii!([40, 32, 59])); + assert_eq!("( ;".to_ascii(), v2ascii!([40, 32, 59])); + // FIXME: #5475 borrowchk error, owned vectors do not live long enough + // if chained-from directly + let v = ~[40u8, 32u8, 59u8]; assert_eq!(v.to_ascii(), v2ascii!([40, 32, 59])); + let v = ~"( ;"; assert_eq!(v.to_ascii(), v2ascii!([40, 32, 59])); + + assert_eq!("abCDef&?#".to_ascii().to_lower().to_str_ascii(), ~"abcdef&?#"); + assert_eq!("abCDef&?#".to_ascii().to_upper().to_str_ascii(), ~"ABCDEF&?#"); + + assert_eq!("".to_ascii().to_lower().to_str_ascii(), ~""); + assert_eq!("YMCA".to_ascii().to_lower().to_str_ascii(), ~"ymca"); + assert_eq!("abcDEFxyz:.;".to_ascii().to_upper().to_str_ascii(), ~"ABCDEFXYZ:.;"); + + assert!("aBcDeF&?#".to_ascii().eq_ignore_case("AbCdEf&?#".to_ascii())); + + assert!("".is_ascii()); + assert!("a".is_ascii()); + assert!(!"\u2009".is_ascii()); + + } + + #[test] + fn test_owned_ascii_vec() { + assert_eq!((~"( ;").into_ascii(), v2ascii!(~[40, 32, 59])); + assert_eq!((~[40u8, 32u8, 59u8]).into_ascii(), v2ascii!(~[40, 32, 59])); + } + + #[test] + fn test_ascii_to_str() { assert_eq!(v2ascii!([40, 32, 59]).to_str_ascii(), ~"( ;"); } + + #[test] + fn test_ascii_into_str() { + assert_eq!(v2ascii!(~[40, 32, 59]).into_str(), ~"( ;"); + } + + #[test] + fn test_ascii_to_bytes() { + assert_eq!(v2ascii!(~[40, 32, 59]).into_bytes(), ~[40u8, 32u8, 59u8]); + } + + #[test] #[should_fail] + fn test_ascii_vec_fail_u8_slice() { (&[127u8, 128u8, 255u8]).to_ascii(); } + + #[test] #[should_fail] + fn test_ascii_vec_fail_str_slice() { "zoä华".to_ascii(); } + + #[test] #[should_fail] + fn test_ascii_fail_u8_slice() { 255u8.to_ascii(); } + + #[test] #[should_fail] + fn test_ascii_fail_char_slice() { 'λ'.to_ascii(); } + + #[test] + fn test_to_ascii_upper() { + assert_eq!("url()URL()uRl()ürl".to_ascii_upper(), ~"URL()URL()URL()üRL"); + assert_eq!("hıKß".to_ascii_upper(), ~"HıKß"); + + let mut i = 0; + while i <= 500 { + let upper = if 'a' as u32 <= i && i <= 'z' as u32 { i + 'A' as u32 - 'a' as u32 } + else { i }; + assert_eq!(from_char(from_u32(i).unwrap()).to_ascii_upper(), + from_char(from_u32(upper).unwrap())) + i += 1; + } + } + + #[test] + fn test_to_ascii_lower() { + assert_eq!("url()URL()uRl()Ürl".to_ascii_lower(), ~"url()url()url()Ürl"); + // Dotted capital I, Kelvin sign, Sharp S. + assert_eq!("HİKß".to_ascii_lower(), ~"hİKß"); + + let mut i = 0; + while i <= 500 { + let lower = if 'A' as u32 <= i && i <= 'Z' as u32 { i + 'a' as u32 - 'A' as u32 } + else { i }; + assert_eq!(from_char(from_u32(i).unwrap()).to_ascii_lower(), + from_char(from_u32(lower).unwrap())) + i += 1; + } + } + + #[test] + fn test_into_ascii_upper() { + assert_eq!((~"url()URL()uRl()ürl").into_ascii_upper(), ~"URL()URL()URL()üRL"); + assert_eq!((~"hıKß").into_ascii_upper(), ~"HıKß"); + + let mut i = 0; + while i <= 500 { + let upper = if 'a' as u32 <= i && i <= 'z' as u32 { i + 'A' as u32 - 'a' as u32 } + else { i }; + assert_eq!(from_char(from_u32(i).unwrap()).into_ascii_upper(), + from_char(from_u32(upper).unwrap())) + i += 1; + } + } + + #[test] + fn test_into_ascii_lower() { + assert_eq!((~"url()URL()uRl()Ürl").into_ascii_lower(), ~"url()url()url()Ürl"); + // Dotted capital I, Kelvin sign, Sharp S. + assert_eq!((~"HİKß").into_ascii_lower(), ~"hİKß"); + + let mut i = 0; + while i <= 500 { + let lower = if 'A' as u32 <= i && i <= 'Z' as u32 { i + 'a' as u32 - 'A' as u32 } + else { i }; + assert_eq!(from_char(from_u32(i).unwrap()).into_ascii_lower(), + from_char(from_u32(lower).unwrap())) + i += 1; + } + } + + #[test] + fn test_eq_ignore_ascii_case() { + assert!("url()URL()uRl()Ürl".eq_ignore_ascii_case("url()url()url()Ürl")); + assert!(!"Ürl".eq_ignore_ascii_case("ürl")); + // Dotted capital I, Kelvin sign, Sharp S. + assert!("HİKß".eq_ignore_ascii_case("hİKß")); + assert!(!"İ".eq_ignore_ascii_case("i")); + assert!(!"K".eq_ignore_ascii_case("k")); + assert!(!"ß".eq_ignore_ascii_case("s")); + + let mut i = 0; + while i <= 500 { + let c = i; + let lower = if 'A' as u32 <= c && c <= 'Z' as u32 { c + 'a' as u32 - 'A' as u32 } + else { c }; + assert!(from_char(from_u32(i).unwrap()). + eq_ignore_ascii_case(from_char(from_u32(lower).unwrap()))); + i += 1; + } + } + + #[test] + fn test_to_str() { + let s = Ascii{ chr: 't' as u8 }.to_str(); + assert_eq!(s, ~"t"); + } + + +} |