From: Tobias Bucher Date: Tue, 10 Mar 2015 11:06:44 +0000 (+0100) Subject: Remove unneeded macro witchery X-Git-Url: https://git.lizzy.rs/?a=commitdiff_plain;h=fb297d102756f352d429cd7a9b262d02254ced6d;p=rust.git Remove unneeded macro witchery --- diff --git a/src/libcore/str/mod.rs b/src/libcore/str/mod.rs index b354116993c..c516bd54129 100644 --- a/src/libcore/str/mod.rs +++ b/src/libcore/str/mod.rs @@ -324,21 +324,20 @@ pub struct Chars<'a> { iter: slice::Iter<'a, u8> } -// Return the initial codepoint accumulator for the first byte. -// The first byte is special, only want bottom 5 bits for width 2, 4 bits -// for width 3, and 3 bits for width 4 -macro_rules! utf8_first_byte { - ($byte:expr, $width:expr) => (($byte & (0x7F >> $width)) as u32) -} +/// Return the initial codepoint accumulator for the first byte. +/// The first byte is special, only want bottom 5 bits for width 2, 4 bits +/// for width 3, and 3 bits for width 4. +#[inline] +fn utf8_first_byte(byte: u8, width: u32) -> u32 { (byte & (0x7F >> width)) as u32 } -// return the value of $ch updated with continuation byte $byte -macro_rules! utf8_acc_cont_byte { - ($ch:expr, $byte:expr) => (($ch << 6) | ($byte & CONT_MASK) as u32) -} +/// Return the value of `ch` updated with continuation byte `byte`. +#[inline] +fn utf8_acc_cont_byte(ch: u32, byte: u8) -> u32 { (ch << 6) | (byte & CONT_MASK) as u32 } -macro_rules! utf8_is_cont_byte { - ($byte:expr) => (($byte & !CONT_MASK) == TAG_CONT_U8) -} +/// Checks whether the byte is a UTF-8 continuation byte (i.e. starts with the +/// bits `10`). +#[inline] +fn utf8_is_cont_byte(byte: u8) -> bool { (byte & !CONT_MASK) == TAG_CONT_U8 } #[inline] fn unwrap_or_0(opt: Option<&u8>) -> u8 { @@ -363,20 +362,20 @@ pub fn next_code_point(bytes: &mut slice::Iter) -> Option { // Multibyte case follows // Decode from a byte combination out of: [[[x y] z] w] // NOTE: Performance is sensitive to the exact formulation here - let init = utf8_first_byte!(x, 2); + let init = utf8_first_byte(x, 2); let y = unwrap_or_0(bytes.next()); - let mut ch = utf8_acc_cont_byte!(init, y); + let mut ch = utf8_acc_cont_byte(init, y); if x >= 0xE0 { // [[x y z] w] case // 5th bit in 0xE0 .. 0xEF is always clear, so `init` is still valid let z = unwrap_or_0(bytes.next()); - let y_z = utf8_acc_cont_byte!((y & CONT_MASK) as u32, z); + let y_z = utf8_acc_cont_byte((y & CONT_MASK) as u32, z); ch = init << 12 | y_z; if x >= 0xF0 { // [x y z w] case // use only the lower 3 bits of `init` let w = unwrap_or_0(bytes.next()); - ch = (init & 7) << 18 | utf8_acc_cont_byte!(y_z, w); + ch = (init & 7) << 18 | utf8_acc_cont_byte(y_z, w); } } @@ -399,18 +398,18 @@ pub fn next_code_point_reverse(bytes: &mut slice::Iter) -> Option { // Decode from a byte combination out of: [x [y [z w]]] let mut ch; let z = unwrap_or_0(bytes.next_back()); - ch = utf8_first_byte!(z, 2); - if utf8_is_cont_byte!(z) { + ch = utf8_first_byte(z, 2); + if utf8_is_cont_byte(z) { let y = unwrap_or_0(bytes.next_back()); - ch = utf8_first_byte!(y, 3); - if utf8_is_cont_byte!(y) { + ch = utf8_first_byte(y, 3); + if utf8_is_cont_byte(y) { let x = unwrap_or_0(bytes.next_back()); - ch = utf8_first_byte!(x, 4); - ch = utf8_acc_cont_byte!(ch, y); + ch = utf8_first_byte(x, 4); + ch = utf8_acc_cont_byte(ch, y); } - ch = utf8_acc_cont_byte!(ch, z); + ch = utf8_acc_cont_byte(ch, z); } - ch = utf8_acc_cont_byte!(ch, w); + ch = utf8_acc_cont_byte(ch, w); Some(ch) } @@ -1027,7 +1026,7 @@ macro_rules! next { () => { // ASCII characters are always valid, so only large // bytes need more examination. if first >= 128 { - let w = UTF8_CHAR_WIDTH[first as usize] as usize; + let w = UTF8_CHAR_WIDTH[first as usize]; let second = next!(); // 2-byte encoding is for codepoints \u{0080} to \u{07ff} // first C2 80 last DF BF @@ -1580,14 +1579,14 @@ fn multibyte_char_range_at_reverse(s: &str, mut i: usize) -> CharRange { i -= 1; } - let mut val = s.as_bytes()[i] as u32; - let w = UTF8_CHAR_WIDTH[val as usize] as usize; - assert!((w != 0)); + let first= s.as_bytes()[i]; + let w = UTF8_CHAR_WIDTH[first as usize]; + assert!(w != 0); - val = utf8_first_byte!(val, w); - val = utf8_acc_cont_byte!(val, s.as_bytes()[i + 1]); - if w > 2 { val = utf8_acc_cont_byte!(val, s.as_bytes()[i + 2]); } - if w > 3 { val = utf8_acc_cont_byte!(val, s.as_bytes()[i + 3]); } + let mut val = utf8_first_byte(first, w as u32); + val = utf8_acc_cont_byte(val, s.as_bytes()[i + 1]); + if w > 2 { val = utf8_acc_cont_byte(val, s.as_bytes()[i + 2]); } + if w > 3 { val = utf8_acc_cont_byte(val, s.as_bytes()[i + 3]); } return CharRange {ch: unsafe { mem::transmute(val) }, next: i}; } @@ -1672,16 +1671,16 @@ pub fn char_range_at_raw(bytes: &[u8], i: usize) -> (u32, usize) { // Multibyte case is a fn to allow char_range_at to inline cleanly fn multibyte_char_range_at(bytes: &[u8], i: usize) -> (u32, usize) { - let mut val = bytes[i] as u32; - let w = UTF8_CHAR_WIDTH[val as usize] as usize; - assert!((w != 0)); + let first = bytes[i]; + let w = UTF8_CHAR_WIDTH[first as usize]; + assert!(w != 0); - val = utf8_first_byte!(val, w); - val = utf8_acc_cont_byte!(val, bytes[i + 1]); - if w > 2 { val = utf8_acc_cont_byte!(val, bytes[i + 2]); } - if w > 3 { val = utf8_acc_cont_byte!(val, bytes[i + 3]); } + let mut val = utf8_first_byte(first, w as u32); + val = utf8_acc_cont_byte(val, bytes[i + 1]); + if w > 2 { val = utf8_acc_cont_byte(val, bytes[i + 2]); } + if w > 3 { val = utf8_acc_cont_byte(val, bytes[i + 3]); } - return (val, i + w); + return (val, i + w as usize); } multibyte_char_range_at(bytes, i)