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Initial vendor packages

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Signed-off-by: Valentin Popov <valentin@popov.link>
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Valentin Popov
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{"files":{"Cargo.toml":"7f8e0b5d66e9c5621c5fb57d4b16b801a24061e37ee337e06f8a004e6895a8dc","LICENSE":"c71d239df91726fc519c6eb72d318ec65820627232b2f796219e87dcf35d0ab4","src/lib.rs":"ef4f143f99e9ef4f17dab02e1b80ed3ac484ae58e0bb64164920720e0ca9425f","src/shared.rs":"e0c98ea10f78491f567e2a18bcb41b3f0ae01ce587d8b3a16ce0dc1097919109","src/tables.rs":"1821b437dfb31164ce8180af3937ca42270f1edf963a2d2e41cbaaf999553c94"},"package":"3b09c83c3c29d37506a3e260c08c03743a6bb66a9cd432c6934ab501a190571f"}

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# THIS FILE IS AUTOMATICALLY GENERATED BY CARGO
#
# When uploading crates to the registry Cargo will automatically
# "normalize" Cargo.toml files for maximal compatibility
# with all versions of Cargo and also rewrite `path` dependencies
# to registry (e.g., crates.io) dependencies.
#
# If you are reading this file be aware that the original Cargo.toml
# will likely look very different (and much more reasonable).
# See Cargo.toml.orig for the original contents.
[package]
edition = "2021"
rust-version = "1.56"
name = "unicode-linebreak"
version = "0.1.5"
authors = ["Axel Forsman <axelsfor@gmail.com>"]
include = [
"src/**/*",
"LICENSE",
]
description = "Implementation of the Unicode Line Breaking Algorithm"
homepage = "https://github.com/axelf4/unicode-linebreak"
readme = "README.md"
keywords = [
"unicode",
"text",
"layout",
]
categories = ["internationalization"]
license = "Apache-2.0"
repository = "https://github.com/axelf4/unicode-linebreak"

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//! Implementation of the Line Breaking Algorithm described in [Unicode Standard Annex #14][UAX14].
//!
//! Given an input text, locates "line break opportunities", or positions appropriate for wrapping
//! lines when displaying text.
//!
//! # Example
//!
//! ```
//! use unicode_linebreak::{linebreaks, BreakOpportunity::{Mandatory, Allowed}};
//!
//! let text = "a b \nc";
//! assert!(linebreaks(text).eq([
//! (2, Allowed), // May break after first space
//! (5, Mandatory), // Must break after line feed
//! (6, Mandatory) // Must break at end of text, so that there always is at least one LB
//! ]));
//! ```
//!
//! [UAX14]: https://www.unicode.org/reports/tr14/
#![no_std]
#![deny(missing_docs, missing_debug_implementations)]
use core::iter::once;
/// The [Unicode version](https://www.unicode.org/versions/) conformed to.
pub const UNICODE_VERSION: (u8, u8, u8) = (15, 0, 0);
include!("shared.rs");
include!("tables.rs");
/// Returns the line break property of the specified code point.
///
/// # Examples
///
/// ```
/// use unicode_linebreak::{BreakClass, break_property};
/// assert_eq!(break_property(0x2CF3), BreakClass::Alphabetic);
/// ```
#[inline(always)]
pub fn break_property(codepoint: u32) -> BreakClass {
const BMP_INDEX_LENGTH: u32 = BMP_LIMIT >> BMP_SHIFT;
const OMITTED_BMP_INDEX_1_LENGTH: u32 = BMP_LIMIT >> SHIFT_1;
let data_pos = if codepoint < BMP_LIMIT {
let i = codepoint >> BMP_SHIFT;
BREAK_PROP_TRIE_INDEX[i as usize] + (codepoint & (BMP_DATA_BLOCK_LENGTH - 1)) as u16
} else if codepoint < BREAK_PROP_TRIE_HIGH_START {
let i1 = codepoint >> SHIFT_1;
let i2 = BREAK_PROP_TRIE_INDEX
[(i1 + BMP_INDEX_LENGTH - OMITTED_BMP_INDEX_1_LENGTH) as usize]
+ ((codepoint >> SHIFT_2) & (INDEX_2_BLOCK_LENGTH - 1)) as u16;
let i3_block = BREAK_PROP_TRIE_INDEX[i2 as usize];
let i3_pos = ((codepoint >> SHIFT_3) & (INDEX_3_BLOCK_LENGTH - 1)) as u16;
debug_assert!(i3_block & 0x8000 == 0, "18-bit indices are unexpected");
let data_block = BREAK_PROP_TRIE_INDEX[(i3_block + i3_pos) as usize];
data_block + (codepoint & (SMALL_DATA_BLOCK_LENGTH - 1)) as u16
} else {
return XX;
};
BREAK_PROP_TRIE_DATA[data_pos as usize]
}
/// Break opportunity type.
#[derive(Copy, Clone, PartialEq, Eq, Debug)]
pub enum BreakOpportunity {
/// A line must break at this spot.
Mandatory,
/// A line is allowed to end at this spot.
Allowed,
}
/// Returns an iterator over line break opportunities in the specified string.
///
/// Break opportunities are given as tuples of the byte index of the character succeeding the break
/// and the type.
///
/// Uses the default Line Breaking Algorithm with the tailoring that Complex-Context Dependent
/// (SA) characters get resolved to Ordinary Alphabetic and Symbol Characters (AL) regardless of
/// General_Category.
///
/// # Examples
///
/// ```
/// use unicode_linebreak::{linebreaks, BreakOpportunity::{Mandatory, Allowed}};
/// assert!(linebreaks("Hello world!").eq(vec![(6, Allowed), (12, Mandatory)]));
/// ```
pub fn linebreaks(s: &str) -> impl Iterator<Item = (usize, BreakOpportunity)> + Clone + '_ {
use BreakOpportunity::{Allowed, Mandatory};
s.char_indices()
.map(|(i, c)| (i, break_property(c as u32) as u8))
.chain(once((s.len(), eot)))
.scan((sot, false), |state, (i, cls)| {
// ZWJ is handled outside the table to reduce its size
let val = PAIR_TABLE[state.0 as usize][cls as usize];
let is_mandatory = val & MANDATORY_BREAK_BIT != 0;
let is_break = val & ALLOWED_BREAK_BIT != 0 && (!state.1 || is_mandatory);
*state = (
val & !(ALLOWED_BREAK_BIT | MANDATORY_BREAK_BIT),
cls == BreakClass::ZeroWidthJoiner as u8,
);
Some((i, is_break, is_mandatory))
})
.filter_map(|(i, is_break, is_mandatory)| {
if is_break {
Some((i, if is_mandatory { Mandatory } else { Allowed }))
} else {
None
}
})
}
/// Divides the string at the last index where further breaks do not depend on prior context.
///
/// The trivial index at `eot` is excluded.
///
/// A common optimization is to determine only the nearest line break opportunity before the first
/// character that would cause the line to become overfull, requiring backward traversal, of which
/// there are two approaches:
///
/// * Cache breaks from forward traversals
/// * Step backward and with `split_at_safe` find a pos to safely search forward from, repeatedly
///
/// # Examples
///
/// ```
/// use unicode_linebreak::{linebreaks, split_at_safe};
/// let s = "Not allowed to break within em dashes: — —";
/// let (prev, safe) = split_at_safe(s);
/// let n = prev.len();
/// assert!(linebreaks(safe).eq(linebreaks(s).filter_map(|(i, x)| i.checked_sub(n).map(|i| (i, x)))));
/// ```
pub fn split_at_safe(s: &str) -> (&str, &str) {
let mut chars = s.char_indices().rev().scan(None, |state, (i, c)| {
let cls = break_property(c as u32);
let is_safe_pair = state
.replace(cls)
.map_or(false, |prev| is_safe_pair(cls, prev)); // Reversed since iterating backwards
Some((i, is_safe_pair))
});
chars.find(|&(_, is_safe_pair)| is_safe_pair);
// Include preceding char for `linebreaks` to pick up break before match (disallowed after sot)
s.split_at(chars.next().map_or(0, |(i, _)| i))
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn it_works() {
assert_eq!(break_property(0xA), BreakClass::LineFeed);
assert_eq!(break_property(0xDB80), BreakClass::Surrogate);
assert_eq!(break_property(0xe01ef), BreakClass::CombiningMark);
assert_eq!(break_property(0x10ffff), BreakClass::Unknown);
}
}

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/// Unicode line breaking class.
#[derive(Copy, Clone, PartialEq, Eq, Hash, Debug)]
#[repr(u8)]
pub enum BreakClass {
// Non-tailorable
/// Cause a line break (after)
Mandatory,
/// Cause a line break (after), except between CR and LF
CarriageReturn,
/// Cause a line break (after)
LineFeed,
/// Prohibit a line break between the character and the preceding character
CombiningMark,
/// Cause a line break (after)
NextLine,
/// Do not occur in well-formed text
Surrogate,
/// Prohibit line breaks before and after
WordJoiner,
/// Provide a break opportunity
ZeroWidthSpace,
/// Prohibit line breaks before and after
NonBreakingGlue,
/// Enable indirect line breaks
Space,
/// Prohibit line breaks within joiner sequences
ZeroWidthJoiner,
// Break opportunities
/// Provide a line break opportunity before and after the character
BeforeAndAfter,
/// Generally provide a line break opportunity after the character
After,
/// Generally provide a line break opportunity before the character
Before,
/// Provide a line break opportunity after the character, except in numeric context
Hyphen,
/// Provide a line break opportunity contingent on additional information
Contingent,
// Characters prohibiting certain breaks
/// Prohibit line breaks before
ClosePunctuation,
/// Prohibit line breaks before
CloseParenthesis,
/// Prohibit line breaks before
Exclamation,
/// Allow only indirect line breaks between pairs
Inseparable,
/// Allow only indirect line breaks before
NonStarter,
/// Prohibit line breaks after
OpenPunctuation,
/// Act like they are both opening and closing
Quotation,
// Numeric context
/// Prevent breaks after any and before numeric
InfixSeparator,
/// Form numeric expressions for line breaking purposes
Numeric,
/// Do not break following a numeric expression
Postfix,
/// Do not break in front of a numeric expression
Prefix,
/// Prevent a break before, and allow a break after
Symbol,
// Other characters
/// Act like AL when the resolved EAW is N; otherwise, act as ID
Ambiguous,
/// Are alphabetic characters or symbols that are used with alphabetic characters
Alphabetic,
/// Treat as NS or ID for strict or normal breaking.
ConditionalJapaneseStarter,
/// Do not break from following Emoji Modifier
EmojiBase,
/// Do not break from preceding Emoji Base
EmojiModifier,
/// Form Korean syllable blocks
HangulLvSyllable,
/// Form Korean syllable blocks
HangulLvtSyllable,
/// Do not break around a following hyphen; otherwise act as Alphabetic
HebrewLetter,
/// Break before or after, except in some numeric context
Ideographic,
/// Form Korean syllable blocks
HangulLJamo,
/// Form Korean syllable blocks
HangulVJamo,
/// Form Korean syllable blocks
HangulTJamo,
/// Keep pairs together. For pairs, break before and after other classes
RegionalIndicator,
/// Provide a line break opportunity contingent on additional, language-specific context analysis
ComplexContext,
/// Have as yet unknown line breaking behavior or unassigned code positions
Unknown,
}
use BreakClass::{
After as BA, Alphabetic as AL, Ambiguous as AI, Before as BB, BeforeAndAfter as B2,
CarriageReturn as CR, CloseParenthesis as CP, ClosePunctuation as CL, CombiningMark as CM,
ComplexContext as SA, ConditionalJapaneseStarter as CJ, Contingent as CB, EmojiBase as EB,
EmojiModifier as EM, Exclamation as EX, HangulLJamo as JL, HangulLvSyllable as H2,
HangulLvtSyllable as H3, HangulTJamo as JT, HangulVJamo as JV, HebrewLetter as HL,
Hyphen as HY, Ideographic as ID, InfixSeparator as IS, Inseparable as IN, LineFeed as LF,
Mandatory as BK, NextLine as NL, NonBreakingGlue as GL, NonStarter as NS, Numeric as NU,
OpenPunctuation as OP, Postfix as PO, Prefix as PR, Quotation as QU, RegionalIndicator as RI,
Space as SP, Surrogate as SG, Symbol as SY, Unknown as XX, WordJoiner as WJ,
ZeroWidthJoiner as ZWJ, ZeroWidthSpace as ZW,
};
/// Ceiling for code points in the Basic Multilingual Place (BMP).
const BMP_LIMIT: u32 = 0x10000;
/// Shift size for getting index-3 table offset.
const SHIFT_3: u32 = 4;
/// Shift size for getting index-2 table offset.
const SHIFT_2: u32 = 5 + SHIFT_3;
/// Shift size for getting index-1 table offset.
const SHIFT_1: u32 = 5 + SHIFT_2;
/// Shift size for getting BMP block start.
const BMP_SHIFT: u32 = 6;
const INDEX_2_BLOCK_LENGTH: u32 = 1 << (SHIFT_1 - SHIFT_2);
const INDEX_3_BLOCK_LENGTH: u32 = 1 << (SHIFT_2 - SHIFT_3);
const SMALL_DATA_BLOCK_LENGTH: u32 = 1 << SHIFT_3;
const BMP_DATA_BLOCK_LENGTH: u32 = 1 << BMP_SHIFT;
const ALLOWED_BREAK_BIT: u8 = 0x80;
const MANDATORY_BREAK_BIT: u8 = 0x40;
#[allow(non_upper_case_globals)]
const eot: u8 = 43;
#[allow(non_upper_case_globals)]
const sot: u8 = 44;

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