diff options
Diffstat (limited to 'vendor/crunchy/build.rs')
| -rw-r--r-- | vendor/crunchy/build.rs | 253 |
1 files changed, 0 insertions, 253 deletions
diff --git a/vendor/crunchy/build.rs b/vendor/crunchy/build.rs deleted file mode 100644 index b9c69ae..0000000 --- a/vendor/crunchy/build.rs +++ /dev/null @@ -1,253 +0,0 @@ -use std::env; -use std::fs::File; -use std::io::Write; -use std::path::Path; - -const LOWER_LIMIT: usize = 16; - -fn main() { - let limit = if cfg!(feature="limit_2048") { - 2048 - } else if cfg!(feature="limit_1024") { - 1024 - } else if cfg!(feature="limit_512") { - 512 - } else if cfg!(feature="limit_256") { - 256 - } else if cfg!(feature="limit_128") { - 128 - } else { - 64 - }; - - let out_dir = env::var("OUT_DIR").unwrap(); - let dest_path = Path::new(&out_dir).join("lib.rs"); - let mut f = File::create(&dest_path).unwrap(); - - let mut output = String::new(); - - output.push_str(r#" -/// Unroll the given for loop -/// -/// Example: -/// -/// ```ignore -/// unroll! { -/// for i in 0..5 { -/// println!("Iteration {}", i); -/// } -/// } -/// ``` -/// -/// will expand into: -/// -/// ```ignore -/// { println!("Iteration {}", 0); } -/// { println!("Iteration {}", 1); } -/// { println!("Iteration {}", 2); } -/// { println!("Iteration {}", 3); } -/// { println!("Iteration {}", 4); } -/// ``` -#[macro_export] -macro_rules! unroll { - (for $v:ident in 0..0 $c:block) => {}; - - (for $v:ident < $max:tt in ($start:tt..$end:tt).step_by($val:expr) {$($c:tt)*}) => { - { - let step = $val; - let start = $start; - let end = start + ($end - start) / step; - unroll! { - for val < $max in start..end { - let $v: usize = ((val - start) * step) + start; - - $($c)* - } - } - } - }; - - (for $v:ident in ($start:tt..$end:tt).step_by($val:expr) {$($c:tt)*}) => { - unroll! { - for $v < $end in ($start..$end).step_by($val) {$($c)*} - } - }; - - (for $v:ident in ($start:tt..$end:tt) {$($c:tt)*}) => { - unroll!{ - for $v in $start..$end {$($c)*} - } - }; - - (for $v:ident in $start:tt..$end:tt {$($c:tt)*}) => { - #[allow(non_upper_case_globals)] - #[allow(unused_comparisons)] - { - unroll!(@$v, 0, $end, { - if $v >= $start {$($c)*} - } - ); - } - }; - - (for $v:ident < $max:tt in $start:tt..$end:tt $c:block) => { - #[allow(non_upper_case_globals)] - { - let range = $start..$end; - assert!( - $max >= range.end, - "`{}` out of range `{:?}`", - stringify!($max), - range, - ); - unroll!( - @$v, - 0, - $max, - { - if $v >= range.start && $v < range.end { - $c - } - } - ); - } - }; - - (for $v:ident in 0..$end:tt {$($statement:tt)*}) => { - #[allow(non_upper_case_globals)] - { unroll!(@$v, 0, $end, {$($statement)*}); } - }; - -"#); - - for i in 0..limit + 1 { - output.push_str(format!(" (@$v:ident, $a:expr, {}, $c:block) => {{\n", i).as_str()); - - if i <= LOWER_LIMIT { - output.push_str(format!(" {{ const $v: usize = $a; $c }}\n").as_str()); - - for a in 1..i { - output.push_str(format!(" {{ const $v: usize = $a + {}; $c }}\n", a).as_str()); - } - } else { - let half = i / 2; - - if i % 2 == 0 { - output.push_str(format!(" unroll!(@$v, $a, {0}, $c);\n", half).as_str()); - output.push_str(format!(" unroll!(@$v, $a + {0}, {0}, $c);\n", half).as_str()); - } else { - if half > 1 { - output.push_str(format!(" unroll!(@$v, $a, {}, $c);\n", i - 1).as_str()) - } - - output.push_str(format!(" {{ const $v: usize = $a + {}; $c }}\n", i - 1).as_str()); - } - } - - output.push_str(" };\n\n"); - } - - output.push_str("}\n\n"); - - output.push_str(format!(r#" -#[cfg(all(test, feature = "std"))] -mod tests {{ - #[test] - fn invalid_range() {{ - let mut a: Vec<usize> = vec![]; - unroll! {{ - for i in (5..4) {{ - a.push(i); - }} - }} - assert_eq!(a, vec![]); - }} - - #[test] - fn start_at_one_with_step() {{ - let mut a: Vec<usize> = vec![]; - unroll! {{ - for i in (2..4).step_by(1) {{ - a.push(i); - }} - }} - assert_eq!(a, vec![2, 3]); - }} - - #[test] - fn start_at_one() {{ - let mut a: Vec<usize> = vec![]; - unroll! {{ - for i in 1..4 {{ - a.push(i); - }} - }} - assert_eq!(a, vec![1, 2, 3]); - }} - - #[test] - fn test_all() {{ - {{ - let a: Vec<usize> = vec![]; - unroll! {{ - for i in 0..0 {{ - a.push(i); - }} - }} - assert_eq!(a, (0..0).collect::<Vec<usize>>()); - }} - {{ - let mut a: Vec<usize> = vec![]; - unroll! {{ - for i in 0..1 {{ - a.push(i); - }} - }} - assert_eq!(a, (0..1).collect::<Vec<usize>>()); - }} - {{ - let mut a: Vec<usize> = vec![]; - unroll! {{ - for i in 0..{0} {{ - a.push(i); - }} - }} - assert_eq!(a, (0..{0}).collect::<Vec<usize>>()); - }} - {{ - let mut a: Vec<usize> = vec![]; - let start = {0} / 4; - let end = start * 3; - unroll! {{ - for i < {0} in start..end {{ - a.push(i); - }} - }} - assert_eq!(a, (start..end).collect::<Vec<usize>>()); - }} - {{ - let mut a: Vec<usize> = vec![]; - unroll! {{ - for i in (0..{0}).step_by(2) {{ - a.push(i); - }} - }} - assert_eq!(a, (0..{0} / 2).map(|x| x * 2).collect::<Vec<usize>>()); - }} - {{ - let mut a: Vec<usize> = vec![]; - let start = {0} / 4; - let end = start * 3; - unroll! {{ - for i < {0} in (start..end).step_by(2) {{ - a.push(i); - }} - }} - assert_eq!(a, (start..end).filter(|x| x % 2 == 0).collect::<Vec<usize>>()); - }} - }} -}} -"#, limit).as_str()); - - f.write_all(output.as_bytes()).unwrap(); -} |