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|
use std::collections::HashMap;
use std::env;
use std::fs::File;
use std::io::{
self,
BufRead,
BufReader,
Write,
};
const MIN_SHIFT: usize = 1;
const MAX_SHIFT: usize = 22;
fn main() {
let out_dir = env::var("OUT_DIR").unwrap();
let root = env::var("CARGO_MANIFEST_DIR").unwrap();
let data = format!("{root}/../data");
println!("cargo:rerun-if-changed={data}/DerivedCoreProperties.txt");
println!("cargo:rerun-if-changed={data}/PropList.txt");
generate_from_file(
&out_dir,
&format!("{data}/DerivedCoreProperties.txt"),
"XID_Start",
"xid_start",
);
generate_from_file(
&out_dir,
&format!("{data}/DerivedCoreProperties.txt"),
"XID_Continue",
"xid_continue",
);
generate_from_file(
&out_dir,
&format!("{data}/PropList.txt"),
"Pattern_White_Space",
"pattern_white_space",
);
generate_from_codepoints(
&out_dir,
&[
'\u{A}', '\u{B}', '\u{C}', '\u{D}', '\u{85}', '\u{2028}',
'\u{2029}',
],
"line_terminator",
);
}
fn generate_from_file(out_dir: &str, path: &str, prop: &str, name: &str) {
let mut bitmap = vec![false; 0x110000];
parse_file(path, prop, &mut bitmap)
.unwrap_or_else(|e| panic!("failed to read {path}: {e}"));
write_output(out_dir, name, &bitmap);
}
fn generate_from_codepoints(out_dir: &str, codepoints: &[char], name: &str) {
let mut bitmap = vec![false; 0x110000];
for &c in codepoints {
bitmap[c as usize] = true;
}
write_output(out_dir, name, &bitmap);
}
fn write_output(out_dir: &str, name: &str, bitmap: &[bool]) {
let (shift, lvl1, lvl2) = optimize_tables(bitmap);
let mut f = File::create(format!("{out_dir}/{name}.rs")).unwrap();
generate_code(&mut f, name, shift, &lvl1, &lvl2);
}
fn optimize_tables(bitmap: &[bool]) -> (usize, Vec<u16>, Vec<u64>) {
let mut minsz = usize::MAX;
let mut config = (0, Vec::new(), Vec::new());
for i in MIN_SHIFT..=MAX_SHIFT {
let (l1, l2) = build_tables(bitmap, i);
let sz = l1.len() * 2 + l2.len() * 8;
if sz < minsz {
minsz = sz;
config = (i, l1, l2);
}
}
config
}
fn parse_file(path: &str, prop: &str, bitmap: &mut [bool]) -> io::Result<()> {
let file = File::open(path)?;
let reader = BufReader::new(file);
for line in reader.lines() {
let line = line?;
let line = line.split('#').next().unwrap_or("").trim();
if line.is_empty() {
continue;
}
let parts: Vec<&str> = line.split(';').map(|s| s.trim()).collect();
if parts.len() < 2 || parts[1] != prop {
continue;
}
let (beg, end) = if parts[0].contains("..") {
let mut range = parts[0].split("..");
(
u32::from_str_radix(range.next().unwrap(), 16).unwrap(),
u32::from_str_radix(range.next().unwrap(), 16).unwrap(),
)
} else {
let val = u32::from_str_radix(parts[0], 16).unwrap();
(val, val)
};
for cp in beg..=end {
if (cp as usize) < bitmap.len() {
bitmap[cp as usize] = true;
}
}
}
Ok(())
}
fn build_tables(bitmap: &[bool], shift: usize) -> (Vec<u16>, Vec<u64>) {
let blksz = 1 << shift;
let u64s_per_block = (blksz + 63) / 64;
let mut lvl2: Vec<u64> = Vec::new();
let mut lvl1: Vec<u16> = Vec::new();
let mut blkmap: HashMap<Vec<u64>, u16> = HashMap::new();
for chunk in bitmap.chunks(blksz) {
let mut blkdata = vec![0u64; u64s_per_block];
for (i, &bit) in chunk.iter().enumerate() {
if bit {
let word_idx = i / 64;
let bit_idx = i % 64;
blkdata[word_idx] |= 1 << bit_idx;
}
}
if let Some(&i) = blkmap.get(&blkdata) {
lvl1.push(i);
} else {
let i = (lvl2.len() / u64s_per_block) as u16;
lvl2.extend_from_slice(&blkdata);
blkmap.insert(blkdata, i);
lvl1.push(i);
}
}
(lvl1, lvl2)
}
fn generate_code(
f: &mut impl Write,
prop_name: &str,
shift: usize,
level1: &[u16],
level2: &[u64],
) {
let upper_name = prop_name.to_uppercase();
let lower_name = prop_name.to_lowercase();
let block_size = 1 << shift;
let mask = block_size - 1;
let u64s_per_block = (block_size + 63) / 64;
let pred_name = if lower_name.contains('_') {
format!("{lower_name}_p")
} else {
format!("{lower_name}p")
};
writeln!(f, "/* Autogenerated – DO NOT EDIT */").unwrap();
writeln!(f).unwrap();
writeln!(f, "static {upper_name}_L1: [u16; {}] = {level1:?};", level1.len()).unwrap();
writeln!(f, "static {upper_name}_L2: [u64; {}] = {level2:?};", level2.len()).unwrap();
writeln!(f, "#[inline]").unwrap();
writeln!(f, "pub fn {pred_name}(c: char) -> bool {{").unwrap();
writeln!(f, "\tlet cp = c as usize;").unwrap();
writeln!(f, "\tlet blki = unsafe {{ *{upper_name}_L1.get_unchecked(cp >> {shift}) }} as usize;").unwrap();
writeln!(f, "\tlet in_blk_offset_p = cp & 0x{mask:X};").unwrap();
if u64s_per_block == 1 {
writeln!(f, "\tunsafe {{ return ({upper_name}_L2.get_unchecked(blki) & (1 << in_blk_offset_p)) != 0; }}").unwrap();
} else {
writeln!(f, "\tlet wordi = (blki * {u64s_per_block}) + (in_blk_offset_p >> 6);").unwrap();
writeln!(f, "\tlet biti = in_blk_offset_p & 0x3F;").unwrap();
writeln!(f, "\tunsafe {{ return (*{upper_name}_L2.get_unchecked(wordi) & (1 << biti)) != 0; }}").unwrap();
}
writeln!(f, "}}").unwrap();
}
|
