007651cd26
Adds documentation for various things that I understand. Adds #[allow(missing_doc)] for lots of things that I don't understand.
412 lines
13 KiB
Rust
412 lines
13 KiB
Rust
// 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.
|
|
|
|
//! Utilities for manipulating the char type
|
|
|
|
use option::{None, Option, Some};
|
|
use str;
|
|
use str::{StrSlice, OwnedStr};
|
|
use u32;
|
|
use uint;
|
|
use unicode::{derived_property, general_category};
|
|
|
|
#[cfg(not(test))]
|
|
use cmp::{Eq, Ord};
|
|
|
|
/*
|
|
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
|
|
*/
|
|
|
|
/// Returns whether the specified character is considered a unicode alphabetic
|
|
/// character
|
|
pub fn is_alphabetic(c: char) -> bool { derived_property::Alphabetic(c) }
|
|
#[allow(missing_doc)]
|
|
pub fn is_XID_start(c: char) -> bool { derived_property::XID_Start(c) }
|
|
#[allow(missing_doc)]
|
|
pub fn is_XID_continue(c: char) -> bool { derived_property::XID_Continue(c) }
|
|
|
|
///
|
|
/// Indicates whether a character is in lower case, defined
|
|
/// in terms of the Unicode General Category 'Ll'
|
|
///
|
|
#[inline(always)]
|
|
pub fn is_lowercase(c: char) -> bool { general_category::Ll(c) }
|
|
|
|
///
|
|
/// Indicates whether a character is in upper case, defined
|
|
/// in terms of the Unicode General Category 'Lu'.
|
|
///
|
|
#[inline(always)]
|
|
pub fn is_uppercase(c: char) -> bool { general_category::Lu(c) }
|
|
|
|
///
|
|
/// Indicates whether a character is whitespace. Whitespace is defined in
|
|
/// terms of the Unicode General Categories 'Zs', 'Zl', 'Zp'
|
|
/// additional 'Cc'-category control codes in the range [0x09, 0x0d]
|
|
///
|
|
#[inline(always)]
|
|
pub fn is_whitespace(c: char) -> bool {
|
|
('\x09' <= c && c <= '\x0d')
|
|
|| general_category::Zs(c)
|
|
|| general_category::Zl(c)
|
|
|| general_category::Zp(c)
|
|
}
|
|
|
|
///
|
|
/// 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'.
|
|
///
|
|
#[inline(always)]
|
|
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 the character is numeric (Nd, Nl, or No)
|
|
#[inline(always)]
|
|
pub fn is_digit(c: char) -> bool {
|
|
general_category::Nd(c)
|
|
|| general_category::Nl(c)
|
|
|| general_category::No(c)
|
|
}
|
|
|
|
///
|
|
/// Checks if a character 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(always)]
|
|
pub fn is_digit_radix(c: char, radix: uint) -> bool {
|
|
match to_digit(c, radix) {
|
|
Some(_) => true,
|
|
None => false,
|
|
}
|
|
}
|
|
|
|
///
|
|
/// Convert 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 to high (maximum 36)", radix);
|
|
}
|
|
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 }
|
|
}
|
|
|
|
///
|
|
/// 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)", num);
|
|
}
|
|
if num < radix {
|
|
if num < 10 {
|
|
Some(('0' as uint + num) as char)
|
|
} else {
|
|
Some(('a' as uint + num - 10u) as char)
|
|
}
|
|
} else {
|
|
None
|
|
}
|
|
}
|
|
|
|
///
|
|
/// Return 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) -> ~str {
|
|
let s = u32::to_str_radix(c as u32, 16u);
|
|
let (c, pad) = cond!(
|
|
(c <= '\xff') { ('x', 2u) }
|
|
(c <= '\uffff') { ('u', 4u) }
|
|
_ { ('U', 8u) }
|
|
);
|
|
assert!(s.len() <= pad);
|
|
let mut out = ~"\\";
|
|
out.push_str(str::from_char(c));
|
|
for uint::range(s.len(), pad) |_| {
|
|
out.push_str("0");
|
|
}
|
|
out.push_str(s);
|
|
out
|
|
}
|
|
|
|
///
|
|
/// Return a 'default' ASCII and C++11-like char-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) -> ~str {
|
|
match c {
|
|
'\t' => ~"\\t",
|
|
'\r' => ~"\\r",
|
|
'\n' => ~"\\n",
|
|
'\\' => ~"\\\\",
|
|
'\'' => ~"\\'",
|
|
'"' => ~"\\\"",
|
|
'\x20' .. '\x7e' => str::from_char(c),
|
|
_ => c.escape_unicode(),
|
|
}
|
|
}
|
|
|
|
/// Returns the amount of bytes this character would need if encoded in utf8
|
|
pub fn len_utf8_bytes(c: char) -> uint {
|
|
static MAX_ONE_B: uint = 128u;
|
|
static MAX_TWO_B: uint = 2048u;
|
|
static MAX_THREE_B: uint = 65536u;
|
|
static MAX_FOUR_B: uint = 2097152u;
|
|
|
|
let code = c as uint;
|
|
cond!(
|
|
(code < MAX_ONE_B) { 1u }
|
|
(code < MAX_TWO_B) { 2u }
|
|
(code < MAX_THREE_B) { 3u }
|
|
(code < MAX_FOUR_B) { 4u }
|
|
_ { fail!("invalid character!") }
|
|
)
|
|
}
|
|
|
|
#[allow(missing_doc)]
|
|
pub trait Char {
|
|
fn is_alphabetic(&self) -> bool;
|
|
fn is_XID_start(&self) -> bool;
|
|
fn is_XID_continue(&self) -> bool;
|
|
fn is_lowercase(&self) -> bool;
|
|
fn is_uppercase(&self) -> bool;
|
|
fn is_whitespace(&self) -> bool;
|
|
fn is_alphanumeric(&self) -> bool;
|
|
fn is_digit(&self) -> bool;
|
|
fn is_digit_radix(&self, radix: uint) -> bool;
|
|
fn to_digit(&self, radix: uint) -> Option<uint>;
|
|
fn from_digit(num: uint, radix: uint) -> Option<char>;
|
|
fn escape_unicode(&self) -> ~str;
|
|
fn escape_default(&self) -> ~str;
|
|
fn len_utf8_bytes(&self) -> 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_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 from_digit(num: uint, radix: uint) -> Option<char> { from_digit(num, radix) }
|
|
|
|
fn escape_unicode(&self) -> ~str { escape_unicode(*self) }
|
|
|
|
fn escape_default(&self) -> ~str { escape_default(*self) }
|
|
|
|
fn len_utf8_bytes(&self) -> uint { len_utf8_bytes(*self) }
|
|
}
|
|
|
|
#[cfg(not(test))]
|
|
impl Eq for char {
|
|
#[inline(always)]
|
|
fn eq(&self, other: &char) -> bool { (*self) == (*other) }
|
|
#[inline(always)]
|
|
fn ne(&self, other: &char) -> bool { (*self) != (*other) }
|
|
}
|
|
|
|
#[cfg(not(test))]
|
|
impl Ord for char {
|
|
#[inline(always)]
|
|
fn lt(&self, other: &char) -> bool { *self < *other }
|
|
#[inline(always)]
|
|
fn le(&self, other: &char) -> bool { *self <= *other }
|
|
#[inline(always)]
|
|
fn gt(&self, other: &char) -> bool { *self > *other }
|
|
#[inline(always)]
|
|
fn ge(&self, other: &char) -> bool { *self >= *other }
|
|
}
|
|
|
|
#[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_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() {
|
|
assert_eq!('\n'.escape_default(), ~"\\n");
|
|
assert_eq!('\r'.escape_default(), ~"\\r");
|
|
assert_eq!('\''.escape_default(), ~"\\'");
|
|
assert_eq!('"'.escape_default(), ~"\\\"");
|
|
assert_eq!(' '.escape_default(), ~" ");
|
|
assert_eq!('a'.escape_default(), ~"a");
|
|
assert_eq!('~'.escape_default(), ~"~");
|
|
assert_eq!('\x00'.escape_default(), ~"\\x00");
|
|
assert_eq!('\x1f'.escape_default(), ~"\\x1f");
|
|
assert_eq!('\x7f'.escape_default(), ~"\\x7f");
|
|
assert_eq!('\xff'.escape_default(), ~"\\xff");
|
|
assert_eq!('\u011b'.escape_default(), ~"\\u011b");
|
|
assert_eq!('\U0001d4b6'.escape_default(), ~"\\U0001d4b6");
|
|
}
|
|
|
|
#[test]
|
|
fn test_escape_unicode() {
|
|
assert_eq!('\x00'.escape_unicode(), ~"\\x00");
|
|
assert_eq!('\n'.escape_unicode(), ~"\\x0a");
|
|
assert_eq!(' '.escape_unicode(), ~"\\x20");
|
|
assert_eq!('a'.escape_unicode(), ~"\\x61");
|
|
assert_eq!('\u011b'.escape_unicode(), ~"\\u011b");
|
|
assert_eq!('\U0001d4b6'.escape_unicode(), ~"\\U0001d4b6");
|
|
}
|