/
char.rs
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/
char.rs
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// Copyright 2012-2013 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.
//! Character manipulation (`char` type, Unicode Scalar Value)
//!
//! This module provides the `Char` trait, as well as its implementation
//! for the primitive `char` type, in order to allow basic character manipulation.
//!
//! A `char` actually represents a
//! *[Unicode Scalar Value](http://www.unicode.org/glossary/#unicode_scalar_value)*,
//! as it can contain any Unicode code point except high-surrogate and
//! low-surrogate code points.
//!
//! As such, only values in the ranges \[0x0,0xD7FF\] and \[0xE000,0x10FFFF\]
//! (inclusive) are allowed. A `char` can always be safely cast to a `u32`;
//! however the converse is not always true due to the above range limits
//! and, as such, should be performed via the `from_u32` function..
use mem::transmute;
use option::{None, Option, Some};
use iter::{Iterator, range_step};
use unicode::{derived_property, property, general_category, conversions};
/// Returns the canonical decomposition of a character.
pub use unicode::normalization::decompose_canonical;
/// Returns the compatibility decomposition of a character.
pub use unicode::normalization::decompose_compatible;
#[cfg(not(test))] use cmp::{Eq, Ord, TotalEq, TotalOrd, Ordering};
#[cfg(not(test))] use default::Default;
// UTF-8 ranges and tags for encoding characters
static TAG_CONT: u8 = 0b1000_0000u8;
static TAG_TWO_B: u8 = 0b1100_0000u8;
static TAG_THREE_B: u8 = 0b1110_0000u8;
static TAG_FOUR_B: u8 = 0b1111_0000u8;
static MAX_ONE_B: u32 = 0x80u32;
static MAX_TWO_B: u32 = 0x800u32;
static MAX_THREE_B: u32 = 0x10000u32;
static MAX_FOUR_B: u32 = 0x200000u32;
/*
Lu Uppercase_Letter an uppercase letter
Ll Lowercase_Letter a lowercase letter
Lt Titlecase_Letter a digraphic character, with first part uppercase
Lm Modifier_Letter a modifier letter
Lo Other_Letter other letters, including syllables and ideographs
Mn Nonspacing_Mark a nonspacing combining mark (zero advance width)
Mc Spacing_Mark a spacing combining mark (positive advance width)
Me Enclosing_Mark an enclosing combining mark
Nd Decimal_Number a decimal digit
Nl Letter_Number a letterlike numeric character
No Other_Number a numeric character of other type
Pc Connector_Punctuation a connecting punctuation mark, like a tie
Pd Dash_Punctuation a dash or hyphen punctuation mark
Ps Open_Punctuation an opening punctuation mark (of a pair)
Pe Close_Punctuation a closing punctuation mark (of a pair)
Pi Initial_Punctuation an initial quotation mark
Pf Final_Punctuation a final quotation mark
Po Other_Punctuation a punctuation mark of other type
Sm Math_Symbol a symbol of primarily mathematical use
Sc Currency_Symbol a currency sign
Sk Modifier_Symbol a non-letterlike modifier symbol
So Other_Symbol a symbol of other type
Zs Space_Separator a space character (of various non-zero widths)
Zl Line_Separator U+2028 LINE SEPARATOR only
Zp Paragraph_Separator U+2029 PARAGRAPH SEPARATOR only
Cc Control a C0 or C1 control code
Cf Format a format control character
Cs Surrogate a surrogate code point
Co Private_Use a private-use character
Cn Unassigned a reserved unassigned code point or a noncharacter
*/
/// The highest valid code point
pub static MAX: char = '\U0010ffff';
/// Converts from `u32` to a `char`
#[inline]
pub fn from_u32(i: u32) -> Option<char> {
// catch out-of-bounds and surrogates
if (i > MAX as u32) || (i >= 0xD800 && i <= 0xDFFF) {
None
} else {
Some(unsafe { transmute(i) })
}
}
/// Returns whether the specified `char` is considered a Unicode alphabetic
/// code point
pub fn is_alphabetic(c: char) -> bool { derived_property::Alphabetic(c) }
/// Returns whether the specified `char` satisfies the 'XID_Start' Unicode property
///
/// 'XID_Start' is a Unicode Derived Property specified in
/// [UAX #31](http://unicode.org/reports/tr31/#NFKC_Modifications),
/// mostly similar to ID_Start but modified for closure under NFKx.
pub fn is_XID_start(c: char) -> bool { derived_property::XID_Start(c) }
/// Returns whether the specified `char` satisfies the 'XID_Continue' Unicode property
///
/// 'XID_Continue' is a Unicode Derived Property specified in
/// [UAX #31](http://unicode.org/reports/tr31/#NFKC_Modifications),
/// mostly similar to 'ID_Continue' but modified for closure under NFKx.
pub fn is_XID_continue(c: char) -> bool { derived_property::XID_Continue(c) }
///
/// Indicates whether a `char` is in lower case
///
/// This is defined according to the terms of the Unicode Derived Core Property 'Lowercase'.
///
#[inline]
pub fn is_lowercase(c: char) -> bool { derived_property::Lowercase(c) }
///
/// Indicates whether a `char` is in upper case
///
/// This is defined according to the terms of the Unicode Derived Core Property 'Uppercase'.
///
#[inline]
pub fn is_uppercase(c: char) -> bool { derived_property::Uppercase(c) }
///
/// Indicates whether a `char` is whitespace
///
/// Whitespace is defined in terms of the Unicode Property 'White_Space'.
///
#[inline]
pub fn is_whitespace(c: char) -> bool {
// As an optimization ASCII whitespace characters are checked separately
c == ' '
|| ('\x09' <= c && c <= '\x0d')
|| property::White_Space(c)
}
///
/// Indicates whether a `char` is alphanumeric
///
/// Alphanumericness is defined in terms of the Unicode General Categories
/// 'Nd', 'Nl', 'No' and the Derived Core Property 'Alphabetic'.
///
#[inline]
pub fn is_alphanumeric(c: char) -> bool {
derived_property::Alphabetic(c)
|| general_category::Nd(c)
|| general_category::Nl(c)
|| general_category::No(c)
}
///
/// Indicates whether a `char` is a control code point
///
/// Control code points are defined in terms of the Unicode General Category
/// 'Cc'.
///
#[inline]
pub fn is_control(c: char) -> bool { general_category::Cc(c) }
/// Indicates whether the `char` is numeric (Nd, Nl, or No)
#[inline]
pub fn is_digit(c: char) -> bool {
general_category::Nd(c)
|| general_category::Nl(c)
|| general_category::No(c)
}
///
/// Checks if a `char` parses as a numeric digit in the given radix
///
/// Compared to `is_digit()`, this function only recognizes the
/// characters `0-9`, `a-z` and `A-Z`.
///
/// # Return value
///
/// Returns `true` if `c` is a valid digit under `radix`, and `false`
/// otherwise.
///
/// # Failure
///
/// Fails if given a `radix` > 36.
///
/// # Note
///
/// This just wraps `to_digit()`.
///
#[inline]
pub fn is_digit_radix(c: char, radix: uint) -> bool {
match to_digit(c, radix) {
Some(_) => true,
None => false,
}
}
///
/// Converts a `char` to the corresponding digit
///
/// # Return value
///
/// If `c` is between '0' and '9', the corresponding value
/// between 0 and 9. If `c` is 'a' or 'A', 10. If `c` is
/// 'b' or 'B', 11, etc. Returns none if the `char` does not
/// refer to a digit in the given radix.
///
/// # Failure
///
/// Fails if given a `radix` outside the range `[0..36]`.
///
#[inline]
pub fn to_digit(c: char, radix: uint) -> Option<uint> {
if radix > 36 {
fail!("to_digit: radix is too high (maximum 36)");
}
let val = match c {
'0' .. '9' => c as uint - ('0' as uint),
'a' .. 'z' => c as uint + 10u - ('a' as uint),
'A' .. 'Z' => c as uint + 10u - ('A' as uint),
_ => return None,
};
if val < radix { Some(val) }
else { None }
}
/// Convert a char to its uppercase equivalent
///
/// The case-folding performed is the common or simple mapping:
/// it maps one unicode codepoint (one char in Rust) to its uppercase equivalent according
/// to the Unicode database at ftp://ftp.unicode.org/Public/UNIDATA/UnicodeData.txt
/// The additional SpecialCasing.txt is not considered here, as it expands to multiple
/// codepoints in some cases.
///
/// A full reference can be found here
/// http://www.unicode.org/versions/Unicode4.0.0/ch03.pdf#G33992
///
/// # Return value
///
/// Returns the char itself if no conversion was made
#[inline]
pub fn to_uppercase(c: char) -> char {
conversions::to_upper(c)
}
/// Convert a char to its lowercase equivalent
///
/// The case-folding performed is the common or simple mapping
/// see `to_uppercase` for references and more information
///
/// # Return value
///
/// Returns the char itself if no conversion if possible
#[inline]
pub fn to_lowercase(c: char) -> char {
conversions::to_lower(c)
}
///
/// Converts a number to the character representing it
///
/// # Return value
///
/// Returns `Some(char)` if `num` represents one digit under `radix`,
/// using one character of `0-9` or `a-z`, or `None` if it doesn't.
///
/// # Failure
///
/// Fails if given an `radix` > 36.
///
#[inline]
pub fn from_digit(num: uint, radix: uint) -> Option<char> {
if radix > 36 {
fail!("from_digit: radix is to high (maximum 36)");
}
if num < radix {
unsafe {
if num < 10 {
Some(transmute(('0' as uint + num) as u32))
} else {
Some(transmute(('a' as uint + num - 10u) as u32))
}
}
} else {
None
}
}
///
/// Returns the hexadecimal Unicode escape of a `char`
///
/// The rules are as follows:
///
/// - chars in [0,0xff] get 2-digit escapes: `\\xNN`
/// - chars in [0x100,0xffff] get 4-digit escapes: `\\uNNNN`
/// - chars above 0x10000 get 8-digit escapes: `\\UNNNNNNNN`
///
pub fn escape_unicode(c: char, f: |char|) {
// avoid calling str::to_str_radix because we don't really need to allocate
// here.
f('\\');
let pad = match () {
_ if c <= '\xff' => { f('x'); 2 }
_ if c <= '\uffff' => { f('u'); 4 }
_ => { f('U'); 8 }
};
for offset in range_step::<i32>(4 * (pad - 1), -1, -4) {
unsafe {
match ((c as i32) >> offset) & 0xf {
i @ 0 .. 9 => { f(transmute('0' as i32 + i)); }
i => { f(transmute('a' as i32 + (i - 10))); }
}
}
}
}
///
/// Returns a 'default' ASCII and C++11-like literal escape of a `char`
///
/// The default is chosen with a bias toward producing literals that are
/// legal in a variety of languages, including C++11 and similar C-family
/// languages. The exact rules are:
///
/// - Tab, CR and LF are escaped as '\t', '\r' and '\n' respectively.
/// - Single-quote, double-quote and backslash chars are backslash-escaped.
/// - Any other chars in the range [0x20,0x7e] are not escaped.
/// - Any other chars are given hex unicode escapes; see `escape_unicode`.
///
pub fn escape_default(c: char, f: |char|) {
match c {
'\t' => { f('\\'); f('t'); }
'\r' => { f('\\'); f('r'); }
'\n' => { f('\\'); f('n'); }
'\\' => { f('\\'); f('\\'); }
'\'' => { f('\\'); f('\''); }
'"' => { f('\\'); f('"'); }
'\x20' .. '\x7e' => { f(c); }
_ => c.escape_unicode(f),
}
}
/// Returns the amount of bytes this `char` would need if encoded in UTF-8
pub fn len_utf8_bytes(c: char) -> uint {
let code = c as u32;
match () {
_ if code < MAX_ONE_B => 1u,
_ if code < MAX_TWO_B => 2u,
_ if code < MAX_THREE_B => 3u,
_ if code < MAX_FOUR_B => 4u,
_ => fail!("invalid character!"),
}
}
/// Useful functions for Unicode characters.
pub trait Char {
/// Returns whether the specified character is considered a Unicode
/// alphabetic code point.
fn is_alphabetic(&self) -> bool;
/// Returns whether the specified character satisfies the 'XID_Start'
/// Unicode property.
///
/// 'XID_Start' is a Unicode Derived Property specified in
/// [UAX #31](http://unicode.org/reports/tr31/#NFKC_Modifications),
/// mostly similar to ID_Start but modified for closure under NFKx.
fn is_XID_start(&self) -> bool;
/// Returns whether the specified `char` satisfies the 'XID_Continue'
/// Unicode property.
///
/// 'XID_Continue' is a Unicode Derived Property specified in
/// [UAX #31](http://unicode.org/reports/tr31/#NFKC_Modifications),
/// mostly similar to 'ID_Continue' but modified for closure under NFKx.
fn is_XID_continue(&self) -> bool;
/// Indicates whether a character is in lowercase.
///
/// This is defined according to the terms of the Unicode Derived Core
/// Property `Lowercase`.
fn is_lowercase(&self) -> bool;
/// Indicates whether a character is in uppercase.
///
/// This is defined according to the terms of the Unicode Derived Core
/// Property `Uppercase`.
fn is_uppercase(&self) -> bool;
/// Indicates whether a character is whitespace.
///
/// Whitespace is defined in terms of the Unicode Property `White_Space`.
fn is_whitespace(&self) -> bool;
/// Indicates whether a character is alphanumeric.
///
/// Alphanumericness is defined in terms of the Unicode General Categories
/// 'Nd', 'Nl', 'No' and the Derived Core Property 'Alphabetic'.
fn is_alphanumeric(&self) -> bool;
/// Indicates whether a character is a control code point.
///
/// Control code points are defined in terms of the Unicode General
/// Category `Cc`.
fn is_control(&self) -> bool;
/// Indicates whether the character is numeric (Nd, Nl, or No).
fn is_digit(&self) -> bool;
/// Checks if a `char` parses as a numeric digit in the given radix.
///
/// Compared to `is_digit()`, this function only recognizes the characters
/// `0-9`, `a-z` and `A-Z`.
///
/// # Return value
///
/// Returns `true` if `c` is a valid digit under `radix`, and `false`
/// otherwise.
///
/// # Failure
///
/// Fails if given a radix > 36.
fn is_digit_radix(&self, radix: uint) -> bool;
/// Converts a character to the corresponding digit.
///
/// # Return value
///
/// If `c` is between '0' and '9', the corresponding value between 0 and
/// 9. If `c` is 'a' or 'A', 10. If `c` is 'b' or 'B', 11, etc. Returns
/// none if the character does not refer to a digit in the given radix.
///
/// # Failure
///
/// Fails if given a radix outside the range [0..36].
fn to_digit(&self, radix: uint) -> Option<uint>;
/// Converts a character to its lowercase equivalent.
///
/// The case-folding performed is the common or simple mapping. See
/// `to_uppercase()` for references and more information.
///
/// # Return value
///
/// Returns the lowercase equivalent of the character, or the character
/// itself if no conversion is possible.
fn to_lowercase(&self) -> char;
/// Converts a character to its uppercase equivalent.
///
/// The case-folding performed is the common or simple mapping: it maps
/// one unicode codepoint (one character in Rust) to its uppercase
/// equivalent according to the Unicode database [1]. The additional
/// `SpecialCasing.txt` is not considered here, as it expands to multiple
/// codepoints in some cases.
///
/// A full reference can be found here [2].
///
/// # Return value
///
/// Returns the uppercase equivalent of the character, or the character
/// itself if no conversion was made.
///
/// [1]: ftp://ftp.unicode.org/Public/UNIDATA/UnicodeData.txt
///
/// [2]: http://www.unicode.org/versions/Unicode4.0.0/ch03.pdf#G33992
fn to_uppercase(&self) -> char;
/// Converts a number to the character representing it.
///
/// # Return value
///
/// Returns `Some(char)` if `num` represents one digit under `radix`,
/// using one character of `0-9` or `a-z`, or `None` if it doesn't.
///
/// # Failure
///
/// Fails if given a radix > 36.
fn from_digit(num: uint, radix: uint) -> Option<char>;
/// Returns the hexadecimal Unicode escape of a character.
///
/// The rules are as follows:
///
/// * Characters in [0,0xff] get 2-digit escapes: `\\xNN`
/// * Characters in [0x100,0xffff] get 4-digit escapes: `\\uNNNN`.
/// * Characters above 0x10000 get 8-digit escapes: `\\UNNNNNNNN`.
fn escape_unicode(&self, f: |char|);
/// Returns a 'default' ASCII and C++11-like literal escape of a
/// character.
///
/// The default is chosen with a bias toward producing literals that are
/// legal in a variety of languages, including C++11 and similar C-family
/// languages. The exact rules are:
///
/// * Tab, CR and LF are escaped as '\t', '\r' and '\n' respectively.
/// * Single-quote, double-quote and backslash chars are backslash-
/// escaped.
/// * Any other chars in the range [0x20,0x7e] are not escaped.
/// * Any other chars are given hex unicode escapes; see `escape_unicode`.
fn escape_default(&self, f: |char|);
/// Returns the amount of bytes this character would need if encoded in
/// UTF-8.
fn len_utf8_bytes(&self) -> uint;
/// Encodes this character as UTF-8 into the provided byte buffer.
///
/// The buffer must be at least 4 bytes long or a runtime failure may
/// occur.
///
/// This will then return the number of bytes written to the slice.
fn encode_utf8(&self, dst: &mut [u8]) -> uint;
/// Encodes this character as UTF-16 into the provided `u16` buffer.
///
/// The buffer must be at least 2 elements long or a runtime failure may
/// occur.
///
/// This will then return the number of `u16`s written to the slice.
fn encode_utf16(&self, dst: &mut [u16]) -> uint;
}
impl Char for char {
fn is_alphabetic(&self) -> bool { is_alphabetic(*self) }
fn is_XID_start(&self) -> bool { is_XID_start(*self) }
fn is_XID_continue(&self) -> bool { is_XID_continue(*self) }
fn is_lowercase(&self) -> bool { is_lowercase(*self) }
fn is_uppercase(&self) -> bool { is_uppercase(*self) }
fn is_whitespace(&self) -> bool { is_whitespace(*self) }
fn is_alphanumeric(&self) -> bool { is_alphanumeric(*self) }
fn is_control(&self) -> bool { is_control(*self) }
fn is_digit(&self) -> bool { is_digit(*self) }
fn is_digit_radix(&self, radix: uint) -> bool { is_digit_radix(*self, radix) }
fn to_digit(&self, radix: uint) -> Option<uint> { to_digit(*self, radix) }
fn to_lowercase(&self) -> char { to_lowercase(*self) }
fn to_uppercase(&self) -> char { to_uppercase(*self) }
fn from_digit(num: uint, radix: uint) -> Option<char> { from_digit(num, radix) }
fn escape_unicode(&self, f: |char|) { escape_unicode(*self, f) }
fn escape_default(&self, f: |char|) { escape_default(*self, f) }
fn len_utf8_bytes(&self) -> uint { len_utf8_bytes(*self) }
fn encode_utf8<'a>(&self, dst: &'a mut [u8]) -> uint {
let code = *self as u32;
if code < MAX_ONE_B {
dst[0] = code as u8;
1
} else if code < MAX_TWO_B {
dst[0] = (code >> 6u & 0x1F_u32) as u8 | TAG_TWO_B;
dst[1] = (code & 0x3F_u32) as u8 | TAG_CONT;
2
} else if code < MAX_THREE_B {
dst[0] = (code >> 12u & 0x0F_u32) as u8 | TAG_THREE_B;
dst[1] = (code >> 6u & 0x3F_u32) as u8 | TAG_CONT;
dst[2] = (code & 0x3F_u32) as u8 | TAG_CONT;
3
} else {
dst[0] = (code >> 18u & 0x07_u32) as u8 | TAG_FOUR_B;
dst[1] = (code >> 12u & 0x3F_u32) as u8 | TAG_CONT;
dst[2] = (code >> 6u & 0x3F_u32) as u8 | TAG_CONT;
dst[3] = (code & 0x3F_u32) as u8 | TAG_CONT;
4
}
}
fn encode_utf16(&self, dst: &mut [u16]) -> uint {
let mut ch = *self as u32;
if (ch & 0xFFFF_u32) == ch {
// The BMP falls through (assuming non-surrogate, as it should)
assert!(ch <= 0xD7FF_u32 || ch >= 0xE000_u32);
dst[0] = ch as u16;
1
} else {
// Supplementary planes break into surrogates.
assert!(ch >= 0x1_0000_u32 && ch <= 0x10_FFFF_u32);
ch -= 0x1_0000_u32;
dst[0] = 0xD800_u16 | ((ch >> 10) as u16);
dst[1] = 0xDC00_u16 | ((ch as u16) & 0x3FF_u16);
2
}
}
}
#[cfg(not(test))]
impl Eq for char {
#[inline]
fn eq(&self, other: &char) -> bool { (*self) == (*other) }
}
#[cfg(not(test))]
impl TotalEq for char {}
#[cfg(not(test))]
impl Ord for char {
#[inline]
fn lt(&self, other: &char) -> bool { *self < *other }
}
#[cfg(not(test))]
impl TotalOrd for char {
fn cmp(&self, other: &char) -> Ordering {
(*self as u32).cmp(&(*other as u32))
}
}
#[cfg(not(test))]
impl Default for char {
#[inline]
fn default() -> char { '\x00' }
}
#[cfg(test)]
mod test {
use super::{escape_unicode, escape_default};
use realcore::char::Char;
use slice::ImmutableVector;
use realstd::option::{Some, None};
use realstd::strbuf::StrBuf;
use realstd::str::StrAllocating;
#[test]
fn test_is_lowercase() {
assert!('a'.is_lowercase());
assert!('ö'.is_lowercase());
assert!('ß'.is_lowercase());
assert!(!'Ü'.is_lowercase());
assert!(!'P'.is_lowercase());
}
#[test]
fn test_is_uppercase() {
assert!(!'h'.is_uppercase());
assert!(!'ä'.is_uppercase());
assert!(!'ß'.is_uppercase());
assert!('Ö'.is_uppercase());
assert!('T'.is_uppercase());
}
#[test]
fn test_is_whitespace() {
assert!(' '.is_whitespace());
assert!('\u2007'.is_whitespace());
assert!('\t'.is_whitespace());
assert!('\n'.is_whitespace());
assert!(!'a'.is_whitespace());
assert!(!'_'.is_whitespace());
assert!(!'\u0000'.is_whitespace());
}
#[test]
fn test_to_digit() {
assert_eq!('0'.to_digit(10u), Some(0u));
assert_eq!('1'.to_digit(2u), Some(1u));
assert_eq!('2'.to_digit(3u), Some(2u));
assert_eq!('9'.to_digit(10u), Some(9u));
assert_eq!('a'.to_digit(16u), Some(10u));
assert_eq!('A'.to_digit(16u), Some(10u));
assert_eq!('b'.to_digit(16u), Some(11u));
assert_eq!('B'.to_digit(16u), Some(11u));
assert_eq!('z'.to_digit(36u), Some(35u));
assert_eq!('Z'.to_digit(36u), Some(35u));
assert_eq!(' '.to_digit(10u), None);
assert_eq!('$'.to_digit(36u), None);
}
#[test]
fn test_to_lowercase() {
assert_eq!('A'.to_lowercase(), 'a');
assert_eq!('Ö'.to_lowercase(), 'ö');
assert_eq!('ß'.to_lowercase(), 'ß');
assert_eq!('Ü'.to_lowercase(), 'ü');
assert_eq!('💩'.to_lowercase(), '💩');
assert_eq!('Σ'.to_lowercase(), 'σ');
assert_eq!('Τ'.to_lowercase(), 'τ');
assert_eq!('Ι'.to_lowercase(), 'ι');
assert_eq!('Γ'.to_lowercase(), 'γ');
assert_eq!('Μ'.to_lowercase(), 'μ');
assert_eq!('Α'.to_lowercase(), 'α');
assert_eq!('Σ'.to_lowercase(), 'σ');
}
#[test]
fn test_to_uppercase() {
assert_eq!('a'.to_uppercase(), 'A');
assert_eq!('ö'.to_uppercase(), 'Ö');
assert_eq!('ß'.to_uppercase(), 'ß'); // not ẞ: Latin capital letter sharp s
assert_eq!('ü'.to_uppercase(), 'Ü');
assert_eq!('💩'.to_uppercase(), '💩');
assert_eq!('σ'.to_uppercase(), 'Σ');
assert_eq!('τ'.to_uppercase(), 'Τ');
assert_eq!('ι'.to_uppercase(), 'Ι');
assert_eq!('γ'.to_uppercase(), 'Γ');
assert_eq!('μ'.to_uppercase(), 'Μ');
assert_eq!('α'.to_uppercase(), 'Α');
assert_eq!('ς'.to_uppercase(), 'Σ');
}
#[test]
fn test_is_control() {
assert!('\u0000'.is_control());
assert!('\u0003'.is_control());
assert!('\u0006'.is_control());
assert!('\u0009'.is_control());
assert!('\u007f'.is_control());
assert!('\u0092'.is_control());
assert!(!'\u0020'.is_control());
assert!(!'\u0055'.is_control());
assert!(!'\u0068'.is_control());
}
#[test]
fn test_is_digit() {
assert!('2'.is_digit());
assert!('7'.is_digit());
assert!(!'c'.is_digit());
assert!(!'i'.is_digit());
assert!(!'z'.is_digit());
assert!(!'Q'.is_digit());
}
#[test]
fn test_escape_default() {
fn string(c: char) -> ~str {
let mut result = StrBuf::new();
escape_default(c, |c| { result.push_char(c); });
return result.into_owned();
}
assert_eq!(string('\n'), "\\n".to_owned());
assert_eq!(string('\r'), "\\r".to_owned());
assert_eq!(string('\''), "\\'".to_owned());
assert_eq!(string('"'), "\\\"".to_owned());
assert_eq!(string(' '), " ".to_owned());
assert_eq!(string('a'), "a".to_owned());
assert_eq!(string('~'), "~".to_owned());
assert_eq!(string('\x00'), "\\x00".to_owned());
assert_eq!(string('\x1f'), "\\x1f".to_owned());
assert_eq!(string('\x7f'), "\\x7f".to_owned());
assert_eq!(string('\xff'), "\\xff".to_owned());
assert_eq!(string('\u011b'), "\\u011b".to_owned());
assert_eq!(string('\U0001d4b6'), "\\U0001d4b6".to_owned());
}
#[test]
fn test_escape_unicode() {
fn string(c: char) -> ~str {
let mut result = StrBuf::new();
escape_unicode(c, |c| { result.push_char(c); });
return result.into_owned();
}
assert_eq!(string('\x00'), "\\x00".to_owned());
assert_eq!(string('\n'), "\\x0a".to_owned());
assert_eq!(string(' '), "\\x20".to_owned());
assert_eq!(string('a'), "\\x61".to_owned());
assert_eq!(string('\u011b'), "\\u011b".to_owned());
assert_eq!(string('\U0001d4b6'), "\\U0001d4b6".to_owned());
}
#[test]
fn test_to_str() {
use realstd::to_str::ToStr;
let s = 't'.to_str();
assert_eq!(s, "t".to_owned());
}
#[test]
fn test_encode_utf8() {
fn check(input: char, expect: &[u8]) {
let mut buf = [0u8, ..4];
let n = input.encode_utf8(buf /* as mut slice! */);
assert_eq!(buf.slice_to(n), expect);
}
check('x', [0x78]);
check('\u00e9', [0xc3, 0xa9]);
check('\ua66e', [0xea, 0x99, 0xae]);
check('\U0001f4a9', [0xf0, 0x9f, 0x92, 0xa9]);
}
#[test]
fn test_encode_utf16() {
fn check(input: char, expect: &[u16]) {
let mut buf = [0u16, ..2];
let n = input.encode_utf16(buf /* as mut slice! */);
assert_eq!(buf.slice_to(n), expect);
}
check('x', [0x0078]);
check('\u00e9', [0x00e9]);
check('\ua66e', [0xa66e]);
check('\U0001f4a9', [0xd83d, 0xdca9]);
}
}