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// This file is part of ICU4X. For terms of use, please see the file
// called LICENSE at the top level of the ICU4X source tree
// (online at: https://github.com/unicode-org/icu4x/blob/main/LICENSE ).
//! Code for the [`DoublePlaceholder`] pattern backend.
use core::convert::Infallible;
use core::{cmp::Ordering, str::FromStr};
use either::Either;
use writeable::adapters::WriteableAsTryWriteableInfallible;
use writeable::Writeable;
use crate::common::*;
use crate::Error;
#[cfg(feature = "alloc")]
use alloc::{boxed::Box, string::String};
/// A two-value enum for the [`DoublePlaceholder`] pattern backend.
///
/// # Examples
///
/// ```
/// use core::cmp::Ordering;
/// use core::str::FromStr;
/// use icu_pattern::DoublePlaceholderKey;
/// use icu_pattern::DoublePlaceholderPattern;
/// use icu_pattern::PatternItem;
///
/// // Parse the string syntax
/// let pattern =
/// DoublePlaceholderPattern::try_from_str("Hello, {0} and {1}!", Default::default()).unwrap();
///
/// assert_eq!(
/// pattern.iter().cmp(
/// [
/// PatternItem::Literal("Hello, "),
/// PatternItem::Placeholder(DoublePlaceholderKey::Place0),
/// PatternItem::Literal(" and "),
/// PatternItem::Placeholder(DoublePlaceholderKey::Place1),
/// PatternItem::Literal("!")
/// ]
/// .into_iter()
/// ),
/// Ordering::Equal
/// );
/// ```
#[derive(Debug, Copy, Clone, PartialEq, Eq, PartialOrd, Ord)]
#[cfg_attr(feature = "serde", derive(serde::Deserialize, serde::Serialize))]
#[allow(clippy::exhaustive_enums)] // Defined to have two entries
pub enum DoublePlaceholderKey {
/// The placeholder `{0}`.
Place0,
/// The placeholder `{1}`.
Place1,
}
impl FromStr for DoublePlaceholderKey {
type Err = Error;
fn from_str(s: &str) -> Result<Self, Self::Err> {
match s {
"0" => Ok(Self::Place0),
"1" => Ok(Self::Place1),
_ => Err(Error::InvalidPlaceholder),
}
}
}
impl<W0, W1> PlaceholderValueProvider<DoublePlaceholderKey> for (W0, W1)
where
W0: Writeable,
W1: Writeable,
{
type Error = Infallible;
type W<'a>
= WriteableAsTryWriteableInfallible<Either<&'a W0, &'a W1>>
where
W0: 'a,
W1: 'a;
const LITERAL_PART: writeable::Part = crate::PATTERN_LITERAL_PART;
#[inline]
fn value_for(&self, key: DoublePlaceholderKey) -> (Self::W<'_>, writeable::Part) {
let writeable = match key {
DoublePlaceholderKey::Place0 => Either::Left(&self.0),
DoublePlaceholderKey::Place1 => Either::Right(&self.1),
};
(
WriteableAsTryWriteableInfallible(writeable),
crate::PATTERN_PLACEHOLDER_PART,
)
}
}
impl<W> PlaceholderValueProvider<DoublePlaceholderKey> for [W; 2]
where
W: Writeable,
{
type Error = Infallible;
type W<'a>
= WriteableAsTryWriteableInfallible<&'a W>
where
W: 'a;
const LITERAL_PART: writeable::Part = crate::PATTERN_LITERAL_PART;
#[inline]
fn value_for(&self, key: DoublePlaceholderKey) -> (Self::W<'_>, writeable::Part) {
let [item0, item1] = self;
let writeable = match key {
DoublePlaceholderKey::Place0 => item0,
DoublePlaceholderKey::Place1 => item1,
};
(
WriteableAsTryWriteableInfallible(writeable),
crate::PATTERN_PLACEHOLDER_PART,
)
}
}
/// Internal representation of a placeholder
#[derive(Debug, Copy, Clone)]
struct DoublePlaceholderInfo {
/// The placeholder key: 0 or 1
pub key: DoublePlaceholderKey,
/// An offset field. This can take one of two forms:
/// - Encoded form: 1 + offset from start of literals
/// - Decoded form: offset from start of store
pub offset: usize,
}
impl DoublePlaceholderInfo {
pub fn from_char(ch: char) -> Self {
Self {
key: if ((ch as usize) & 0x1) == 0 {
DoublePlaceholderKey::Place0
} else {
DoublePlaceholderKey::Place1
},
offset: (ch as usize) >> 1,
}
}
#[cfg(feature = "alloc")]
pub fn try_to_char(self) -> Result<char, Error> {
let usize_val = match self.key {
DoublePlaceholderKey::Place0 => 0,
DoublePlaceholderKey::Place1 => 1,
} | (self.offset << 1);
u32::try_from(usize_val)
.ok()
.and_then(|x| char::try_from(x).ok())
.ok_or(Error::InvalidPattern)
}
/// Creates a PlaceholderInfo for an empty Place0
pub fn no_place0() -> Self {
Self {
key: DoublePlaceholderKey::Place0,
offset: 0,
}
}
/// Changes Place0 to Place1 and vice-versa
pub fn swap(self) -> Self {
Self {
key: match self.key {
DoublePlaceholderKey::Place0 => DoublePlaceholderKey::Place1,
DoublePlaceholderKey::Place1 => DoublePlaceholderKey::Place0,
},
offset: self.offset,
}
}
/// Sets the offset to 0 (ignored placeholder), retaining the key
#[cfg(feature = "alloc")]
pub fn clear(self) -> Self {
Self {
key: self.key,
offset: 0,
}
}
}
/// Backend for patterns containing zero, one, or two placeholders.
///
/// This empty type is not constructible.
///
/// # Placeholder Keys
///
/// The placeholder is either [`DoublePlaceholderKey::Place0`] or [`DoublePlaceholderKey::Place1`].
///
/// In [`Pattern::interpolate()`], pass a two-element array or tuple.
///
/// # Encoding Details
///
/// The first two code points contain the indices of the first and second placeholders with
/// the following encoding:
///
/// 1. First bit: 0 for [`DoublePlaceholderKey::Place0`], 1 for [`DoublePlaceholderKey::Place1`].
/// 2. Second and higher bits: 1 plus the byte offset of the placeholder counting from after
/// the placeholder index code points. If zero, skip this placeholder.
///
/// # Examples
///
/// Parsing a pattern into the encoding:
///
/// ```
/// use core::str::FromStr;
/// use icu_pattern::DoublePlaceholder;
/// use icu_pattern::Pattern;
///
/// // Parse the string syntax and check the resulting data store:
/// let pattern =
/// Pattern::<DoublePlaceholder>::try_from_str("Hello, {0} and {1}!", Default::default())
/// .unwrap();
///
/// assert_eq!("\x10\x1BHello, and !", &pattern.store);
/// ```
///
/// Explanation of the lead code points:
///
/// 1. `\x10` is placeholder 0 at index 7: ((7 + 1) << 1) | 0
/// 2. `\x1B` is placeholder 1 at index 12: ((12 + 1) << 1) | 1
///
/// Example patterns supported by this backend:
///
/// ```
/// use core::str::FromStr;
/// use icu_pattern::DoublePlaceholder;
/// use icu_pattern::Pattern;
/// use icu_pattern::QuoteMode;
///
/// // Single numeric placeholder (note, "5" is used):
/// assert_eq!(
/// Pattern::<DoublePlaceholder>::try_from_str("{0} days ago", Default::default())
/// .unwrap()
/// .interpolate_to_string([5, 7]),
/// "5 days ago",
/// );
///
/// // No placeholder (note, the placeholder value is never accessed):
/// assert_eq!(
/// Pattern::<DoublePlaceholder>::try_from_str("yesterday", Default::default())
/// .unwrap()
/// .interpolate_to_string(["foo", "bar"]),
/// "yesterday",
/// );
///
/// // Escaped placeholder and a placeholder value 1 (note, "bar" is used):
/// assert_eq!(
/// Pattern::<DoublePlaceholder>::try_from_str("'{0}' {1}", QuoteMode::QuotingSupported.into())
/// .unwrap()
/// .interpolate_to_string(("foo", "bar")),
/// "{0} bar",
/// );
///
/// // Pattern with the placeholders in the opposite order:
/// assert_eq!(
/// Pattern::<DoublePlaceholder>::try_from_str("A {1} B {0} C", Default::default())
/// .unwrap()
/// .interpolate_to_string(("D", "E")),
/// "A E B D C",
/// );
///
/// // No literals, only placeholders:
/// assert_eq!(
/// Pattern::<DoublePlaceholder>::try_from_str("{1}{0}", Default::default())
/// .unwrap()
/// .interpolate_to_string((1, "A")),
/// "A1",
/// );
/// ```
///
/// [`Pattern::interpolate()`]: crate::Pattern::interpolate
#[derive(Debug, Copy, Clone, PartialEq, Eq)]
#[allow(clippy::exhaustive_enums)] // Empty Enum
pub enum DoublePlaceholder {}
impl crate::private::Sealed for DoublePlaceholder {}
impl PatternBackend for DoublePlaceholder {
type PlaceholderKey<'a> = DoublePlaceholderKey;
#[cfg(feature = "alloc")]
type PlaceholderKeyCow<'a> = DoublePlaceholderKey;
type Error<'a> = Infallible;
type Store = str;
type Iter<'a> = DoublePlaceholderPatternIterator<'a>;
fn validate_store(store: &Self::Store) -> Result<(), Error> {
let mut chars = store.chars();
let ph_first_char = chars.next().ok_or(Error::InvalidPattern)?;
let ph_second_char = chars.next().ok_or(Error::InvalidPattern)?;
let initial_offset = ph_first_char.len_utf8() + ph_second_char.len_utf8();
let ph_first = DoublePlaceholderInfo::from_char(ph_first_char);
let ph_second = DoublePlaceholderInfo::from_char(ph_second_char);
if ph_first.key == ph_second.key {
return Err(Error::InvalidPattern);
}
if ph_first.offset > ph_second.offset && ph_second.offset > 0 {
return Err(Error::InvalidPattern);
}
if ph_second.offset > store.len() - initial_offset + 1 {
return Err(Error::InvalidPattern);
}
if (ph_second_char as usize) >= 0xD800 {
return Err(Error::InvalidPattern);
}
Ok(())
}
fn iter_items(store: &Self::Store) -> Self::Iter<'_> {
let mut chars = store.chars();
let (mut ph_first, ph_first_len) = match chars.next() {
Some(ch) => (DoublePlaceholderInfo::from_char(ch), ch.len_utf8()),
None => {
debug_assert!(false);
(DoublePlaceholderInfo::no_place0(), 0)
}
};
let (mut ph_second, ph_second_len) = match chars.next() {
Some(ch) => (DoublePlaceholderInfo::from_char(ch), ch.len_utf8()),
None => {
debug_assert!(false);
(ph_first.swap(), ph_first_len)
}
};
let initial_offset = ph_first_len + ph_second_len;
ph_first.offset += initial_offset - 1;
ph_second.offset += initial_offset - 1;
DoublePlaceholderPatternIterator {
store,
ph_first,
ph_second,
current_offset: initial_offset,
}
}
#[cfg(feature = "alloc")]
fn try_from_items<
'cow,
'ph,
I: Iterator<Item = Result<PatternItemCow<'cow, Self::PlaceholderKey<'ph>>, Error>>,
>(
items: I,
) -> Result<Box<str>, Error> {
let mut result = String::new();
let mut first_ph = None;
let mut second_ph = None;
for item in items {
match item? {
PatternItemCow::Literal(s) => result.push_str(&s),
PatternItemCow::Placeholder(ph_key) => {
if second_ph.is_some() {
return Err(Error::InvalidPattern);
}
let placeholder_offset = result.len() + 1;
if placeholder_offset >= 0xD800 {
return Err(Error::InvalidPattern);
}
let ph_info = DoublePlaceholderInfo {
key: ph_key,
offset: placeholder_offset,
};
if first_ph.is_none() {
first_ph.replace(ph_info);
} else {
second_ph.replace(ph_info);
}
}
}
}
let (first_ph, second_ph) = match (first_ph, second_ph) {
(Some(a), Some(b)) => (a, b),
(Some(a), None) => (a, a.swap().clear()),
(None, None) => (
DoublePlaceholderInfo::no_place0(),
DoublePlaceholderInfo::no_place0().swap(),
),
(None, Some(_)) => unreachable!("first_ph always populated before second_ph"),
};
if first_ph.key == second_ph.key {
return Err(Error::InvalidPattern);
}
result.insert(0, second_ph.try_to_char()?);
result.insert(0, first_ph.try_to_char()?);
Ok(result.into_boxed_str())
}
fn empty() -> &'static Self::Store {
"\0\u{1}"
}
}
#[doc(hidden)] // TODO(#4467): Should be internal
#[derive(Debug)]
pub struct DoublePlaceholderPatternIterator<'a> {
store: &'a str,
ph_first: DoublePlaceholderInfo,
ph_second: DoublePlaceholderInfo,
current_offset: usize,
}
// Note: This impl is not exported via public bounds, but it might be in the
// future, and the compiler might be able to find it. The code is also
// reachable from `Iterator::size_hint`.
impl ExactSizeIterator for DoublePlaceholderPatternIterator<'_> {
fn len(&self) -> usize {
let mut chars = self.store.chars();
let (mut ph_first, ph_first_len) = match chars.next() {
Some(ch) => (DoublePlaceholderInfo::from_char(ch), ch.len_utf8()),
None => {
debug_assert!(false);
(DoublePlaceholderInfo::no_place0(), 0)
}
};
let (mut ph_second, ph_second_len) = match chars.next() {
Some(ch) => (DoublePlaceholderInfo::from_char(ch), ch.len_utf8()),
None => {
debug_assert!(false);
(ph_first.swap(), ph_first_len)
}
};
let initial_offset = ph_first_len + ph_second_len;
ph_first.offset += initial_offset - 1;
ph_second.offset += initial_offset - 1;
let store_len = self.store.len();
#[allow(clippy::comparison_chain)]
if ph_first.offset < initial_offset {
// No placeholders
if initial_offset < store_len {
// No placeholder, non-empty literal
1
} else {
// No placeholder, empty literal
0
}
} else if ph_first.offset == initial_offset {
// At least 1 placeholder, empty prefix
if ph_second.offset < initial_offset {
// Single placeholder
if ph_first.offset < store_len {
// Single placeholder, empty prefix, non-empty suffix
2
} else {
// Single placeholder, empty prefix, empty suffix
1
}
} else if ph_second.offset == ph_first.offset {
// Two placeholders, empty infix
if ph_first.offset < store_len {
// Two placeholders, empty prefix, empty infix, non-empty suffix
3
} else {
// Two placeholders, empty prefix, empty infix, empty suffix
2
}
} else if ph_second.offset < store_len {
// Two placeholders, empty prefix, non-empty infix, non-empty suffix
4
} else {
// Two placeholders, empty prefix, non-empty infix, empty suffix
3
}
} else {
// At least 1 placeholder, non-empty prefix
if ph_second.offset < initial_offset {
// Single placeholder
if ph_first.offset < store_len {
// Single placeholder, non-empty prefix, non-empty suffix
3
} else {
// Single placeholder, non-empty prefix, empty suffix
2
}
} else if ph_second.offset == ph_first.offset {
// Two placeholders, empty infix
if ph_first.offset < store_len {
// Two placeholders, non-empty prefix, empty infix, non-empty suffix
4
} else {
// Two placeholders, non-empty prefix, empty infix, empty suffix
3
}
} else if ph_second.offset < store_len {
// Two placeholders, non-empty prefix, non-empty infix, non-empty suffix
5
} else {
// Two placeholders, non-empty prefix, non-empty infix, empty suffix
4
}
}
}
}
impl<'a> Iterator for DoublePlaceholderPatternIterator<'a> {
type Item = PatternItem<'a, DoublePlaceholderKey>;
fn next(&mut self) -> Option<Self::Item> {
match self.current_offset.cmp(&self.ph_first.offset) {
Ordering::Less => {
// Prefix
let literal_str = match self.store.get(self.current_offset..self.ph_first.offset) {
Some(s) => s,
None => {
debug_assert!(false, "offsets are in range");
""
}
};
self.current_offset = self.ph_first.offset;
Some(PatternItem::Literal(literal_str))
}
Ordering::Equal => {
// Placeholder
self.ph_first.offset = 0;
Some(PatternItem::Placeholder(self.ph_first.key))
}
Ordering::Greater => match self.current_offset.cmp(&self.ph_second.offset) {
Ordering::Less => {
// Infix
let literal_str =
match self.store.get(self.current_offset..self.ph_second.offset) {
Some(s) => s,
None => {
debug_assert!(false, "offsets are in range");
""
}
};
self.current_offset = self.ph_second.offset;
Some(PatternItem::Literal(literal_str))
}
Ordering::Equal => {
// Placeholder
self.ph_second.offset = 0;
Some(PatternItem::Placeholder(self.ph_second.key))
}
Ordering::Greater => {
// Suffix or end of string
let literal_str = match self.store.get(self.current_offset..) {
Some(s) => s,
None => {
debug_assert!(false, "offsets are in range");
""
}
};
if literal_str.is_empty() {
// End of string
None
} else {
// Suffix
self.current_offset = self.store.len();
Some(PatternItem::Literal(literal_str))
}
}
},
}
}
fn size_hint(&self) -> (usize, Option<usize>) {
let len = self.len();
(len, Some(len))
}
}
#[cfg(test)]
mod tests {
use super::*;
use crate::DoublePlaceholderPattern;
#[test]
fn test_permutations() {
#[derive(Debug)]
struct TestCase<'a> {
pattern: &'a str,
store: &'a str,
/// Interpolation with 0=apple, 1=orange
interpolated: &'a str,
}
let cases = [
TestCase {
pattern: "",
store: "\x00\x01",
interpolated: "",
},
TestCase {
pattern: "{0}",
store: "\x02\x01",
interpolated: "apple",
},
TestCase {
pattern: "X{0}",
store: "\x04\x01X",
interpolated: "Xapple",
},
TestCase {
pattern: "{0}Y",
store: "\x02\x01Y",
interpolated: "appleY",
},
TestCase {
pattern: "X{0}Y",
store: "\x04\x01XY",
interpolated: "XappleY",
},
TestCase {
pattern: "{1}",
store: "\x03\x00",
interpolated: "orange",
},
TestCase {
pattern: "X{1}",
store: "\x05\x00X",
interpolated: "Xorange",
},
TestCase {
pattern: "{1}Y",
store: "\x03\x00Y",
interpolated: "orangeY",
},
TestCase {
pattern: "X{1}Y",
store: "\x05\x00XY",
interpolated: "XorangeY",
},
TestCase {
pattern: "{0}{1}",
store: "\x02\x03",
interpolated: "appleorange",
},
TestCase {
pattern: "X{0}{1}",
store: "\x04\x05X",
interpolated: "Xappleorange",
},
TestCase {
pattern: "{0}Y{1}",
store: "\x02\x05Y",
interpolated: "appleYorange",
},
TestCase {
pattern: "{0}{1}Z",
store: "\x02\x03Z",
interpolated: "appleorangeZ",
},
TestCase {
pattern: "X{0}Y{1}",
store: "\x04\x07XY",
interpolated: "XappleYorange",
},
TestCase {
pattern: "X{0}{1}Z",
store: "\x04\x05XZ",
interpolated: "XappleorangeZ",
},
TestCase {
pattern: "{0}Y{1}Z",
store: "\x02\x05YZ",
interpolated: "appleYorangeZ",
},
TestCase {
pattern: "X{0}Y{1}Z",
store: "\x04\x07XYZ",
interpolated: "XappleYorangeZ",
},
TestCase {
pattern: "{1}{0}",
store: "\x03\x02",
interpolated: "orangeapple",
},
TestCase {
pattern: "X{1}{0}",
store: "\x05\x04X",
interpolated: "Xorangeapple",
},
TestCase {
pattern: "{1}Y{0}",
store: "\x03\x04Y",
interpolated: "orangeYapple",
},
TestCase {
pattern: "{1}{0}Z",
store: "\x03\x02Z",
interpolated: "orangeappleZ",
},
TestCase {
pattern: "X{1}Y{0}",
store: "\x05\x06XY",
interpolated: "XorangeYapple",
},
TestCase {
pattern: "X{1}{0}Z",
store: "\x05\x04XZ",
interpolated: "XorangeappleZ",
},
TestCase {
pattern: "{1}Y{0}Z",
store: "\x03\x04YZ",
interpolated: "orangeYappleZ",
},
TestCase {
pattern: "X{1}Y{0}Z",
store: "\x05\x06XYZ",
interpolated: "XorangeYappleZ",
},
TestCase {
pattern: "01234567890123456789012345678901234567890123456789012345678901234567890123456789{0}Y{1}Z",
store: "\u{A2}\u{A5}01234567890123456789012345678901234567890123456789012345678901234567890123456789YZ",
interpolated: "01234567890123456789012345678901234567890123456789012345678901234567890123456789appleYorangeZ",
},
];
for cas in cases {
let TestCase {
pattern,
store,
interpolated,
} = cas;
let parsed =
DoublePlaceholderPattern::try_from_str(pattern, Default::default()).unwrap();
let actual = parsed
.interpolate(["apple", "orange"])
.write_to_string()
.into_owned();
assert_eq!(&parsed.store, store, "{cas:?}");
assert_eq!(actual, interpolated, "{cas:?}");
}
}
#[test]
fn test_invalid() {
let cases = [
"", // too short
"\x00", // too short
"\x00\x00", // duplicate placeholders
"\x04\x03", // first offset is after second offset
"\x04\x05", // second offset out of range (also first offset)
"\x04\u{10001}@", // second offset too large for UTF-8
];
let long_str = "0123456789".repeat(1000000);
for cas in cases {
let cas = cas.replace('@', &long_str);
assert!(DoublePlaceholder::validate_store(&cas).is_err(), "{cas:?}");
}
}
}