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Copy pathdata.rs
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570 lines (518 loc) · 17.8 KB
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//! Access to the Unicode character database (`unicodedata`).
//!
//! Owns the generated Unicode 3.2.0 / latest tables and the
//! `icu4x`/`unicode_names2` lookups behind them.
// spell-checker:ignore codep decomp DECOMP unidata
use core::{cmp::Ordering, fmt::Write, hint::cold_path};
use alloc::{
format,
string::{String, ToString},
};
use icu_normalizer::properties::{CanonicalDecomposition, Decomposed};
use icu_properties::props::{
BidiClass, BidiMirrored, BinaryProperty, CanonicalCombiningClass, EastAsianWidth,
EnumeratedProperty, GeneralCategory, NamedEnumeratedProperty, NumericType,
};
use rustpython_wtf8::CodePoint;
include!(concat!(env!("OUT_DIR"), "/generated/algo_names.rs"));
include!(concat!(env!("OUT_DIR"), "/generated/name_lookups.rs"));
include!(concat!(env!("OUT_DIR"), "/generated/bidi_class_3_2.rs"));
include!(concat!(env!("OUT_DIR"), "/generated/binary_props_3_2.rs"));
include!(concat!(
env!("OUT_DIR"),
"/generated/combining_class_3_2.rs"
));
include!(concat!(env!("OUT_DIR"), "/generated/decomp.rs"));
include!(concat!(env!("OUT_DIR"), "/generated/eaw_3_2.rs"));
include!(concat!(env!("OUT_DIR"), "/generated/gen_cat_3_2.rs"));
include!(concat!(env!("OUT_DIR"), "/generated/membership_3_2.rs"));
include!(concat!(env!("OUT_DIR"), "/generated/numeric_value_3_2.rs"));
include!(concat!(env!("OUT_DIR"), "/generated/num_type_3_2.rs"));
#[derive(Clone, Copy)]
enum DecompositionType {
Compat,
Circle,
Final,
Font,
Fraction,
Initial,
Isolated,
Medial,
Narrow,
Nobreak,
Small,
Square,
Sub,
Super,
Vertical,
Wide,
}
impl DecompositionType {
const fn type_tag(self) -> &'static str {
match self {
Self::Compat => "compat",
Self::Circle => "circle",
Self::Final => "final",
Self::Font => "font",
Self::Fraction => "fraction",
Self::Initial => "initial",
Self::Isolated => "isolated",
Self::Medial => "medial",
Self::Narrow => "narrow",
Self::Nobreak => "noBreak",
Self::Small => "small",
Self::Square => "square",
Self::Sub => "sub",
Self::Super => "super",
Self::Vertical => "vertical",
Self::Wide => "wide",
}
}
}
#[derive(Clone, Copy, PartialEq)]
enum AlgorithmicName {
TangutIdeograph,
}
impl AlgorithmicName {
const fn name_base(self) -> &'static str {
match self {
Self::TangutIdeograph => "TANGUT IDEOGRAPH",
}
}
fn to_name(self, ch: char) -> String {
match self {
Self::TangutIdeograph => format!("{}-{:0X}", self.name_base(), ch as u32),
}
}
fn check_name(search_name: &str) -> Option<char> {
// CPython compares derived-name prefixes case-insensitively
// (`PyOS_strnicmp` in `_getcode`).
let folded: String = search_name
.chars()
.map(|c| c.to_ascii_uppercase())
.collect();
if let Some(without_base) = folded.strip_prefix(Self::TangutIdeograph.name_base()) {
// `parse_hex_code` does not skip spaces around the digits.
let hex = without_base.strip_prefix('-')?;
// `_getcode` / `parse_hex_code`: 4–6 digits, no leading zero.
if hex.len() < 4 || hex.len() > 6 || hex.starts_with('0') {
return None;
}
let cp = u32::from_str_radix(hex, 16).ok()?;
let ch = char::from_u32(cp)?;
if lookup_table(ALGO_NAMES, ch)? == Self::TangutIdeograph {
return Some(ch);
}
}
None
}
}
/// Result of `unicodedata.lookup`.
///
/// A named sequence is several characters; `\N{...}` only accepts a
/// single character, so `lookup_character` drops `Sequence`.
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum LookupResult {
Character(char),
Sequence(&'static str),
}
fn fold_lookup_name(name: &str) -> String {
name.chars().map(|c| c.to_ascii_uppercase()).collect()
}
fn lookup_alias(name: &str) -> Option<char> {
let key = fold_lookup_name(name);
NAME_ALIASES
.binary_search_by_key(&key.as_str(), |(n, _)| *n)
.ok()
.map(|i| NAME_ALIASES[i].1)
}
fn lookup_named_sequence(name: &str) -> Option<&'static str> {
let key = fold_lookup_name(name);
NAMED_SEQUENCES
.binary_search_by_key(&key.as_str(), |(n, _)| *n)
.ok()
.map(|i| NAMED_SEQUENCES[i].1)
}
fn lookup_table<T: Copy>(table: &[(u32, u32, T)], ch: char) -> Option<T> {
let ch = ch as u32;
table
.binary_search_by(|&(start, end, _)| {
if ch > end {
Ordering::Less
} else if ch < start {
Ordering::Greater
} else {
Ordering::Equal
}
})
.ok()
.map(|i| table[i].2)
}
#[cold]
#[inline(never)]
#[must_use]
pub fn membership_3_2(ch: u32) -> bool {
MEMBERSHIP_3_2
.binary_search_by(|&(start, end)| {
if ch > end {
Ordering::Less
} else if ch < start {
Ordering::Greater
} else {
Ordering::Equal
}
})
.is_ok()
}
fn lookup_property_diff<T: Copy>(
table: &[(u32, u32, T)],
diff: &[(u32, u32, T)],
ch: char,
modern: bool,
) -> Option<T> {
if modern {
lookup_table(table, ch)
} else {
cold_path();
lookup_table(diff, ch).or_else(|| {
membership_3_2(ch as u32)
.then(|| lookup_table(table, ch))
.flatten()
})
}
}
/// The version string of the latest Unicode database bundled with the standard
/// library (`unicodedata.unidata_version`).
#[must_use]
pub fn unicode_version() -> String {
format!(
"{}.{}.{}",
char::UNICODE_VERSION.0,
char::UNICODE_VERSION.1,
char::UNICODE_VERSION.2
)
}
/// Look up a name in the latest UCD (`unicodedata.lookup`).
///
/// Named sequences are included; `\N{...}` should use [`lookup_character`]
/// so a sequence is reported as unknown.
#[must_use]
pub fn lookup_name(search_name: &str) -> Option<LookupResult> {
Ucd::new(true).lookup(search_name)
}
/// Look up a single character by its Unicode name (`\N{...}`).
///
/// Named sequences are not characters and so do not resolve.
#[must_use]
pub fn lookup_character(search_name: &str) -> Option<char> {
match lookup_name(search_name) {
Some(LookupResult::Character(ch)) => Some(ch),
Some(LookupResult::Sequence(_)) | None => None,
}
}
/// The Unicode name of `ch` (`unicodedata.name`), if any.
#[must_use]
pub fn character_name(ch: char) -> Option<String> {
unicode_names2::name(ch)
.map(|name| name.to_string())
.or_else(|| lookup_table(ALGO_NAMES, ch).map(|v| v.to_name(ch)))
}
/// A view over the Unicode character database at a fixed version.
///
/// `modern` selects the latest bundled UCD; otherwise the Unicode 3.2.0 tables
/// used by `unicodedata.ucd_3_2_0` are consulted.
#[derive(Debug, Clone, Copy)]
pub struct Ucd {
modern: bool,
}
impl Ucd {
#[must_use]
pub const fn new(modern: bool) -> Self {
Self { modern }
}
#[must_use]
pub fn membership(self, ch: char) -> bool {
if !self.modern {
cold_path();
membership_3_2(ch as u32)
} else {
// Rust chars always "exist" for modern Unicode or else they wouldn't be chars.
true
}
}
/// Look up `name` in this UCD view.
///
/// Unicode 3.2.0 has no name aliases and no named sequences
/// (`unicodedata.ucd_3_2_0.lookup`).
#[must_use]
pub fn lookup(self, search_name: &str) -> Option<LookupResult> {
if let Some(ch) = unicode_names2::character(search_name)
.or_else(|| AlgorithmicName::check_name(search_name))
{
return self.membership(ch).then_some(LookupResult::Character(ch));
}
if !self.modern {
return None;
}
if let Some(ch) = lookup_alias(search_name) {
return Some(LookupResult::Character(ch));
}
lookup_named_sequence(search_name).map(LookupResult::Sequence)
}
#[must_use]
pub fn category(&self, c: CodePoint) -> &'static str {
let Some(c) = c.to_char() else {
return GeneralCategory::Surrogate.short_name();
};
if self.modern {
Some(GeneralCategory::for_char(c))
} else {
cold_path();
lookup_table(GENERAL_CATEGORY, c)
}
.unwrap_or(GeneralCategory::Unassigned)
.short_name()
}
#[must_use]
pub fn bidirectional(&self, c: CodePoint) -> &'static str {
c.to_char()
.and_then(|c| {
if self.modern {
Some(BidiClass::for_char(c))
} else {
cold_path();
lookup_table(BIDI_CLASS_DIFF, c)
.or_else(|| membership_3_2(c as u32).then(|| BidiClass::for_char(c)))
}
})
.as_ref()
.map(BidiClass::short_name)
.unwrap_or_default()
}
#[must_use]
pub fn east_asian_width(&self, c: CodePoint) -> &'static str {
c.to_char()
.and_then(|c| {
if self.modern {
Some(EastAsianWidth::for_char(c))
} else {
cold_path();
// CPython overrides characters in the PUA for 3.2.0.
// Basic Multilingual Plane:
// https://en.wikipedia.org/wiki/Plane_(Unicode)#Basic_Multilingual_Plane
// https://en.wikipedia.org/wiki/Private_Use_Areas
// https://www.unicode.org/reports/tr11/tr11-10.html
// https://www.unicode.org/reports/tr11/
//
// Currently, this implementation is incomplete because I can't figure
// out what CPython is doing.
lookup_table(EAST_ASIAN_WIDTH, c)
}
})
.unwrap_or(EastAsianWidth::Neutral)
.short_name()
}
#[must_use]
pub fn mirrored(&self, c: CodePoint) -> i32 {
c.to_char().map_or(0, |c| {
(if self.modern {
BidiMirrored::for_char(c)
} else {
cold_path();
let c = c as u32;
BIDI_MIRRORED
.binary_search_by(|&(start, end)| {
if c > end {
Ordering::Less
} else if c < start {
Ordering::Greater
} else {
Ordering::Equal
}
})
.is_ok()
}) as i32
})
}
#[must_use]
pub fn combining(&self, c: CodePoint) -> u8 {
c.to_char()
.and_then(|c| {
if self.modern {
Some(CanonicalCombiningClass::for_char(c))
} else {
cold_path();
lookup_table(COMBINING_CLASS, c)
}
})
.unwrap_or(CanonicalCombiningClass::NotReordered)
.to_icu4c_value()
}
#[must_use]
pub fn decomposition(&self, c: CodePoint) -> String {
let Some(ch) = c.to_char() else {
return String::new();
};
// Decomposition is remarkable stable according to the normalization file,
// so the updates slice is very small - only about four char pairs. Linearly searching
// it is very fast. The file lists the original, incorrect decomp and the fixed char.
// For 3.2.0, we use the original decomp for compatibility while ignoring the update.
//
// Finally, we don't have to do anything for the latest UCD as it's already updated.
if self.modern
&& let Some((_, original)) = DECOMP_UPDATES
.iter()
.find(|&&(codep, _original)| codep == ch as u32)
{
format!("{original:04X}")
} else if let Ok(i) =
DECOMP_COMPAT.binary_search_by_key(&(ch as u32), |&(codep, _, _)| codep)
{
// Compatibility decomposition
// `icu4x` doesn't expose a non-recursive, compatibility decomposer so we
// have to do it manually for now.
let tag = DECOMP_COMPAT[i].1.type_tag();
let end = DECOMP_COMPAT[i].2;
let start = i
.checked_sub(1)
.map(|i| DECOMP_COMPAT[i].2)
.unwrap_or_default();
let decomp = &DECOMP_RANGE[start..end];
let cap = decomp.len() * 10 + decomp.len() + tag.len() + 1;
let mut out = String::with_capacity(cap);
write!(out, "<{tag}>").unwrap();
for ch in decomp {
write!(out, " {ch:04X}").unwrap();
}
out
} else {
// Canonical decomposition
let decomposed = CanonicalDecomposition::new().decompose(ch);
match decomposed {
Decomposed::Default => String::new(),
Decomposed::Singleton(ch) => format!("{:04X}", ch as u32),
Decomposed::Expansion(l, r) => format!("{:04X} {:04X}", l as u32, r as u32),
}
}
}
fn numeric_type_matches(self, ch: CodePoint, expected: &[NumericType]) -> Option<char> {
let ch = ch.to_char()?;
let actual = if self.modern {
NumericType::for_char(ch)
} else {
cold_path();
lookup_table(NUMERIC_TYPE_DIFF, ch).unwrap_or_else(|| NumericType::for_char(ch))
};
expected.contains(&actual).then_some(ch)
}
/// The integer digit value of `c` (`unicodedata.digit`), if it has one.
#[must_use]
pub fn digit(&self, c: CodePoint) -> Option<u64> {
let expected = [NumericType::Decimal, NumericType::Digit];
self.numeric_type_matches(c, &expected).and_then(|ch| {
let value = lookup_property_diff(NUMERIC_VALUES, &[], ch, true)?;
let int = value as u64;
(int as f64 == value).then_some(int)
})
}
/// The integer decimal value of `c` (`unicodedata.decimal`), if it has one.
#[must_use]
pub fn decimal(&self, c: CodePoint) -> Option<u64> {
let expected = [NumericType::Decimal];
self.numeric_type_matches(c, &expected).and_then(|ch| {
let value = lookup_property_diff(NUMERIC_VALUES, NUMERIC_VALUES_DIFF, ch, self.modern)?;
let int = value as u64;
(int as f64 == value).then_some(int)
})
}
/// The numeric value of `c` (`unicodedata.numeric`), if it has one.
#[must_use]
pub fn numeric(&self, c: CodePoint) -> Option<f64> {
let expected = &NumericType::ALL_VALUES[1..];
self.numeric_type_matches(c, expected).and_then(|ch| {
lookup_property_diff(NUMERIC_VALUES, NUMERIC_VALUES_DIFF, ch, self.modern)
})
}
#[must_use]
pub fn unidata_version(&self) -> String {
if self.modern {
unicode_version()
} else {
"3.2.0".into()
}
}
}
#[cfg(test)]
mod tests {
use rustpython_wtf8::CodePoint;
use super::{LookupResult, Ucd, character_name, lookup_character, lookup_name};
fn cp(ch: char) -> CodePoint {
CodePoint::from(ch)
}
#[test]
fn data_queries_match_unicodedata_behavior() {
let ucd = Ucd::new(true);
assert_eq!(ucd.category(cp('A')), "Lu");
assert_eq!(ucd.category(CodePoint::from_u32(0xD800).unwrap()), "Cs");
assert_eq!(lookup_character("SNOWMAN"), Some('☃'));
assert_eq!(character_name('☃').as_deref(), Some("SNOWMAN"));
assert_eq!(ucd.decimal(cp('५')), Some(5));
assert_eq!(ucd.digit(cp('²')), Some(2));
assert_eq!(ucd.numeric(cp('⅓')), Some(1.0 / 3.0));
assert_eq!(ucd.numeric(cp('⅐')), Some(1.0 / 7.0));
}
#[test]
fn ucd_3_2_0_view_differs_from_modern() {
let legacy = Ucd::new(false);
assert_eq!(legacy.unidata_version(), "3.2.0");
}
#[test]
fn name_aliases_resolve_and_do_not_replace_the_official_name() {
assert_eq!(
lookup_character("LATIN CAPITAL LETTER GHA"),
Some('\u{01A2}')
);
assert_eq!(
lookup_character("latin capital letter gha"),
Some('\u{01A2}')
);
assert_eq!(
character_name('\u{01A2}').as_deref(),
Some("LATIN CAPITAL LETTER OI")
);
assert_eq!(Ucd::new(false).lookup("LATIN CAPITAL LETTER GHA"), None);
}
#[test]
fn named_sequences_resolve_only_on_the_modern_view() {
assert_eq!(
lookup_name("LATIN SMALL LETTER R WITH TILDE"),
Some(LookupResult::Sequence("r\u{0303}"))
);
assert_eq!(
lookup_name("KEYCAP NUMBER SIGN"),
Some(LookupResult::Sequence("#\u{FE0F}\u{20E3}"))
);
assert_eq!(lookup_character("LATIN SMALL LETTER R WITH TILDE"), None);
assert_eq!(
Ucd::new(false).lookup("LATIN SMALL LETTER R WITH TILDE"),
None
);
}
#[test]
fn tangut_derived_names_are_case_insensitive() {
assert_eq!(
lookup_character("TANGUT IDEOGRAPH-17000"),
Some('\u{17000}')
);
assert_eq!(
lookup_character("tangut ideograph-18d08"),
Some('\u{18D08}')
);
assert_eq!(
character_name('\u{17000}').as_deref(),
Some("TANGUT IDEOGRAPH-17000")
);
assert_eq!(lookup_character("TANGUT IDEOGRAPH- 17000"), None);
assert_eq!(lookup_character("TANGUT IDEOGRAPH-17000 "), None);
}
}
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