#![allow(non_snake_case)]
#![doc(primitive = "char")]
+use iter::Iterator;
use mem::transmute;
-use option::Option;
+use ops::FnMut;
use option::Option::{None, Some};
-use iter::{range_step, Iterator, RangeStep};
-use slice::SlicePrelude;
+use option::Option;
+use slice::SliceExt;
// UTF-8 ranges and tags for encoding characters
static TAG_CONT: u8 = 0b1000_0000u8;
#[unstable = "pending decisions about costructors for primitives"]
pub fn from_digit(num: uint, radix: uint) -> Option<char> {
if radix > 36 {
- panic!("from_digit: radix is to high (maximum 36)");
+ panic!("from_digit: radix is too high (maximum 36)");
}
if num < radix {
unsafe {
}
}
-///
-/// 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: `\\u{NNNN}`
-/// - chars above 0x10000 get 8-digit escapes: `\\u{{NNN}NNNNN}`
-///
+/// Deprecated, call the escape_unicode method instead.
#[deprecated = "use the Char::escape_unicode method"]
-pub fn escape_unicode(c: char, f: |char|) {
+pub fn escape_unicode<F>(c: char, mut f: F) where F: FnMut(char) {
for char in c.escape_unicode() {
f(char);
}
}
-///
-/// 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`.
-///
+/// Deprecated, call the escape_default method instead.
#[deprecated = "use the Char::escape_default method"]
-pub fn escape_default(c: char, f: |char|) {
+pub fn escape_default<F>(c: char, mut f: F) where F: FnMut(char) {
for c in c.escape_default() {
f(c);
}
/// Returns an iterator that yields the hexadecimal Unicode escape
/// of a character, as `char`s.
///
- /// The rules are as follows:
- ///
- /// * Characters in [0,0xff] get 2-digit escapes: `\\xNN`
- /// * Characters in [0x100,0xffff] get 4-digit escapes: `\\u{NNNN}`.
- /// * Characters above 0x10000 get 8-digit escapes: `\\u{{NNN}NNNNN}`.
+ /// All characters are escaped with Rust syntax of the form `\\u{NNNN}`
+ /// where `NNNN` is the shortest hexadecimal representation of the code
+ /// point.
#[unstable = "pending error conventions, trait organization"]
- fn escape_unicode(self) -> UnicodeEscapedChars;
+ fn escape_unicode(self) -> EscapeUnicode;
/// Returns an iterator that yields the 'default' ASCII and
/// C++11-like literal escape of a character, as `char`s.
/// * Any other chars in the range [0x20,0x7e] are not escaped.
/// * Any other chars are given hex Unicode escapes; see `escape_unicode`.
#[unstable = "pending error conventions, trait organization"]
- fn escape_default(self) -> DefaultEscapedChars;
+ fn escape_default(self) -> EscapeDefault;
/// Returns the amount of bytes this character would need if encoded in
/// UTF-8.
fn from_u32(i: u32) -> Option<char> { from_u32(i) }
#[unstable = "pending error conventions, trait organization"]
- fn escape_unicode(self) -> UnicodeEscapedChars {
- UnicodeEscapedChars { c: self, state: UnicodeEscapedCharsState::Backslash }
+ fn escape_unicode(self) -> EscapeUnicode {
+ EscapeUnicode { c: self, state: EscapeUnicodeState::Backslash }
}
#[unstable = "pending error conventions, trait organization"]
- fn escape_default(self) -> DefaultEscapedChars {
+ fn escape_default(self) -> EscapeDefault {
let init_state = match self {
- '\t' => DefaultEscapedCharsState::Backslash('t'),
- '\r' => DefaultEscapedCharsState::Backslash('r'),
- '\n' => DefaultEscapedCharsState::Backslash('n'),
- '\\' => DefaultEscapedCharsState::Backslash('\\'),
- '\'' => DefaultEscapedCharsState::Backslash('\''),
- '"' => DefaultEscapedCharsState::Backslash('"'),
- '\x20' ... '\x7e' => DefaultEscapedCharsState::Char(self),
- _ => DefaultEscapedCharsState::Unicode(self.escape_unicode())
+ '\t' => EscapeDefaultState::Backslash('t'),
+ '\r' => EscapeDefaultState::Backslash('r'),
+ '\n' => EscapeDefaultState::Backslash('n'),
+ '\\' => EscapeDefaultState::Backslash('\\'),
+ '\'' => EscapeDefaultState::Backslash('\''),
+ '"' => EscapeDefaultState::Backslash('"'),
+ '\x20' ... '\x7e' => EscapeDefaultState::Char(self),
+ _ => EscapeDefaultState::Unicode(self.escape_unicode())
};
- DefaultEscapedChars { state: init_state }
+ EscapeDefault { state: init_state }
}
#[inline]
/// An iterator over the characters that represent a `char`, as escaped by
/// Rust's unicode escaping rules.
-pub struct UnicodeEscapedChars {
+pub struct EscapeUnicode {
c: char,
- state: UnicodeEscapedCharsState
+ state: EscapeUnicodeState
}
-enum UnicodeEscapedCharsState {
+enum EscapeUnicodeState {
Backslash,
Type,
- Value(RangeStep<i32>),
+ LeftBrace,
+ Value(uint),
+ RightBrace,
+ Done,
}
-impl Iterator<char> for UnicodeEscapedChars {
+impl Iterator<char> for EscapeUnicode {
fn next(&mut self) -> Option<char> {
match self.state {
- UnicodeEscapedCharsState::Backslash => {
- self.state = UnicodeEscapedCharsState::Type;
+ EscapeUnicodeState::Backslash => {
+ self.state = EscapeUnicodeState::Type;
Some('\\')
}
- UnicodeEscapedCharsState::Type => {
- let (typechar, pad) = if self.c <= '\x7f' { ('x', 2) }
- else if self.c <= '\u{ffff}' { ('u', 4) }
- else { ('U', 8) };
- self.state = UnicodeEscapedCharsState::Value(range_step(4 * (pad - 1), -1, -4i32));
- Some(typechar)
+ EscapeUnicodeState::Type => {
+ self.state = EscapeUnicodeState::LeftBrace;
+ Some('u')
}
- UnicodeEscapedCharsState::Value(ref mut range_step) => match range_step.next() {
- Some(offset) => {
- let offset = offset as uint;
- let v = match ((self.c as i32) >> offset) & 0xf {
- i @ 0 ... 9 => '0' as i32 + i,
- i => 'a' as i32 + (i - 10)
- };
- Some(unsafe { transmute(v) })
+ EscapeUnicodeState::LeftBrace => {
+ let mut n = 0u;
+ while (self.c as u32) >> (4 * (n + 1)) != 0 {
+ n += 1;
}
- None => None
+ self.state = EscapeUnicodeState::Value(n);
+ Some('{')
+ }
+ EscapeUnicodeState::Value(offset) => {
+ let v = match ((self.c as i32) >> (offset * 4)) & 0xf {
+ i @ 0 ... 9 => '0' as i32 + i,
+ i => 'a' as i32 + (i - 10)
+ };
+ if offset == 0 {
+ self.state = EscapeUnicodeState::RightBrace;
+ } else {
+ self.state = EscapeUnicodeState::Value(offset - 1);
+ }
+ Some(unsafe { transmute(v) })
+ }
+ EscapeUnicodeState::RightBrace => {
+ self.state = EscapeUnicodeState::Done;
+ Some('}')
}
+ EscapeUnicodeState::Done => None,
}
}
}
/// An iterator over the characters that represent a `char`, escaped
/// for maximum portability.
-pub struct DefaultEscapedChars {
- state: DefaultEscapedCharsState
+pub struct EscapeDefault {
+ state: EscapeDefaultState
}
-enum DefaultEscapedCharsState {
+enum EscapeDefaultState {
Backslash(char),
Char(char),
Done,
- Unicode(UnicodeEscapedChars),
+ Unicode(EscapeUnicode),
}
-impl Iterator<char> for DefaultEscapedChars {
+impl Iterator<char> for EscapeDefault {
fn next(&mut self) -> Option<char> {
match self.state {
- DefaultEscapedCharsState::Backslash(c) => {
- self.state = DefaultEscapedCharsState::Char(c);
+ EscapeDefaultState::Backslash(c) => {
+ self.state = EscapeDefaultState::Char(c);
Some('\\')
}
- DefaultEscapedCharsState::Char(c) => {
- self.state = DefaultEscapedCharsState::Done;
+ EscapeDefaultState::Char(c) => {
+ self.state = EscapeDefaultState::Done;
Some(c)
}
- DefaultEscapedCharsState::Done => None,
- DefaultEscapedCharsState::Unicode(ref mut iter) => iter.next()
+ EscapeDefaultState::Done => None,
+ EscapeDefaultState::Unicode(ref mut iter) => iter.next()
}
}
}
projects / rust.git / blobdiff