idna_adapter/
lib.rs

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1// Copyright The rust-url developers.
2//
3// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
4// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
5// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
6// option. This file may not be copied, modified, or distributed
7// except according to those terms.
8
9//! This crate abstracts over a Unicode back end for the [`idna`][1]
10//! crate.
11//!
12//! To work around the lack of [`global-features`][2] in Cargo, this
13//! crate allows the top level `Cargo.lock` to choose an alternative
14//! Unicode back end for the `idna` crate by pinning a version of this
15//! crate.
16//!
17//! See the [README of the latest version][3] for more details.
18//!
19//! [1]: https://docs.rs/crate/idna/latest
20//! [2]: https://internals.rust-lang.org/t/pre-rfc-mutually-excusive-global-features/19618
21//! [3]: https://docs.rs/crate/idna_adapter/latest
22
23#![no_std]
24
25use icu_normalizer::properties::CanonicalCombiningClassMap;
26use icu_normalizer::uts46::Uts46Mapper;
27use icu_properties::maps::CodePointMapDataBorrowed;
28use icu_properties::CanonicalCombiningClass;
29use icu_properties::GeneralCategory;
30
31/// Turns a joining type into a mask for comparing with multiple type at once.
32const fn joining_type_to_mask(jt: icu_properties::JoiningType) -> u32 {
33    1u32 << jt.0
34}
35
36/// Mask for checking for both left and dual joining.
37pub const LEFT_OR_DUAL_JOINING_MASK: JoiningTypeMask = JoiningTypeMask(
38    joining_type_to_mask(icu_properties::JoiningType::LeftJoining)
39        | joining_type_to_mask(icu_properties::JoiningType::DualJoining),
40);
41
42/// Mask for checking for both left and dual joining.
43pub const RIGHT_OR_DUAL_JOINING_MASK: JoiningTypeMask = JoiningTypeMask(
44    joining_type_to_mask(icu_properties::JoiningType::RightJoining)
45        | joining_type_to_mask(icu_properties::JoiningType::DualJoining),
46);
47
48/// Turns a bidi class into a mask for comparing with multiple classes at once.
49const fn bidi_class_to_mask(bc: icu_properties::BidiClass) -> u32 {
50    1u32 << bc.0
51}
52
53/// Mask for checking if the domain is a bidi domain.
54pub const RTL_MASK: BidiClassMask = BidiClassMask(
55    bidi_class_to_mask(icu_properties::BidiClass::RightToLeft)
56        | bidi_class_to_mask(icu_properties::BidiClass::ArabicLetter)
57        | bidi_class_to_mask(icu_properties::BidiClass::ArabicNumber),
58);
59
60/// Mask for allowable bidi classes in the first character of a label
61/// (either LTR or RTL) in a bidi domain.
62pub const FIRST_BC_MASK: BidiClassMask = BidiClassMask(
63    bidi_class_to_mask(icu_properties::BidiClass::LeftToRight)
64        | bidi_class_to_mask(icu_properties::BidiClass::RightToLeft)
65        | bidi_class_to_mask(icu_properties::BidiClass::ArabicLetter),
66);
67
68// Mask for allowable bidi classes of the last (non-Non-Spacing Mark)
69// character in an LTR label in a bidi domain.
70pub const LAST_LTR_MASK: BidiClassMask = BidiClassMask(
71    bidi_class_to_mask(icu_properties::BidiClass::LeftToRight)
72        | bidi_class_to_mask(icu_properties::BidiClass::EuropeanNumber),
73);
74
75// Mask for allowable bidi classes of the last (non-Non-Spacing Mark)
76// character in an RTL label in a bidi domain.
77pub const LAST_RTL_MASK: BidiClassMask = BidiClassMask(
78    bidi_class_to_mask(icu_properties::BidiClass::RightToLeft)
79        | bidi_class_to_mask(icu_properties::BidiClass::ArabicLetter)
80        | bidi_class_to_mask(icu_properties::BidiClass::EuropeanNumber)
81        | bidi_class_to_mask(icu_properties::BidiClass::ArabicNumber),
82);
83
84// Mask for allowable bidi classes of the middle characters in an LTR label in a bidi domain.
85pub const MIDDLE_LTR_MASK: BidiClassMask = BidiClassMask(
86    bidi_class_to_mask(icu_properties::BidiClass::LeftToRight)
87        | bidi_class_to_mask(icu_properties::BidiClass::EuropeanNumber)
88        | bidi_class_to_mask(icu_properties::BidiClass::EuropeanSeparator)
89        | bidi_class_to_mask(icu_properties::BidiClass::CommonSeparator)
90        | bidi_class_to_mask(icu_properties::BidiClass::EuropeanTerminator)
91        | bidi_class_to_mask(icu_properties::BidiClass::OtherNeutral)
92        | bidi_class_to_mask(icu_properties::BidiClass::BoundaryNeutral)
93        | bidi_class_to_mask(icu_properties::BidiClass::NonspacingMark),
94);
95
96// Mask for allowable bidi classes of the middle characters in an RTL label in a bidi domain.
97pub const MIDDLE_RTL_MASK: BidiClassMask = BidiClassMask(
98    bidi_class_to_mask(icu_properties::BidiClass::RightToLeft)
99        | bidi_class_to_mask(icu_properties::BidiClass::ArabicLetter)
100        | bidi_class_to_mask(icu_properties::BidiClass::ArabicNumber)
101        | bidi_class_to_mask(icu_properties::BidiClass::EuropeanNumber)
102        | bidi_class_to_mask(icu_properties::BidiClass::EuropeanSeparator)
103        | bidi_class_to_mask(icu_properties::BidiClass::CommonSeparator)
104        | bidi_class_to_mask(icu_properties::BidiClass::EuropeanTerminator)
105        | bidi_class_to_mask(icu_properties::BidiClass::OtherNeutral)
106        | bidi_class_to_mask(icu_properties::BidiClass::BoundaryNeutral)
107        | bidi_class_to_mask(icu_properties::BidiClass::NonspacingMark),
108);
109
110/// Turns a genecal category into a mask for comparing with multiple categories at once.
111const fn general_category_to_mask(gc: GeneralCategory) -> u32 {
112    1 << (gc as u32)
113}
114
115/// Mask for the disallowed general categories of the first character in a label.
116const MARK_MASK: u32 = general_category_to_mask(GeneralCategory::NonspacingMark)
117    | general_category_to_mask(GeneralCategory::SpacingMark)
118    | general_category_to_mask(GeneralCategory::EnclosingMark);
119
120/// Value for the Joining_Type Unicode property.
121#[repr(transparent)]
122#[derive(Clone, Copy)]
123pub struct JoiningType(icu_properties::JoiningType);
124
125impl JoiningType {
126    /// Returns the corresponding `JoiningTypeMask`.
127    #[inline(always)]
128    pub fn to_mask(self) -> JoiningTypeMask {
129        JoiningTypeMask(joining_type_to_mask(self.0))
130    }
131
132    // `true` iff this value is the Transparent value.
133    #[inline(always)]
134    pub fn is_transparent(self) -> bool {
135        self.0 == icu_properties::JoiningType::Transparent
136    }
137}
138
139/// A mask representing potentially multiple `JoiningType`
140/// values.
141#[repr(transparent)]
142#[derive(Clone, Copy)]
143pub struct JoiningTypeMask(u32);
144
145impl JoiningTypeMask {
146    /// `true` iff both masks have at `JoiningType` in common.
147    #[inline(always)]
148    pub fn intersects(self, other: JoiningTypeMask) -> bool {
149        self.0 & other.0 != 0
150    }
151}
152
153/// Value for the Bidi_Class Unicode property.
154#[repr(transparent)]
155#[derive(Clone, Copy)]
156pub struct BidiClass(icu_properties::BidiClass);
157
158impl BidiClass {
159    /// Returns the corresponding `BidiClassMask`.
160    #[inline(always)]
161    pub fn to_mask(self) -> BidiClassMask {
162        BidiClassMask(bidi_class_to_mask(self.0))
163    }
164
165    /// `true` iff this value is Left_To_Right
166    #[inline(always)]
167    pub fn is_ltr(self) -> bool {
168        self.0 == icu_properties::BidiClass::LeftToRight
169    }
170
171    /// `true` iff this value is Nonspacing_Mark
172    #[inline(always)]
173    pub fn is_nonspacing_mark(self) -> bool {
174        self.0 == icu_properties::BidiClass::NonspacingMark
175    }
176
177    /// `true` iff this value is European_Number
178    #[inline(always)]
179    pub fn is_european_number(self) -> bool {
180        self.0 == icu_properties::BidiClass::EuropeanNumber
181    }
182
183    /// `true` iff this value is Arabic_Number
184    #[inline(always)]
185    pub fn is_arabic_number(self) -> bool {
186        self.0 == icu_properties::BidiClass::ArabicNumber
187    }
188}
189
190/// A mask representing potentially multiple `BidiClass`
191/// values.
192#[repr(transparent)]
193#[derive(Clone, Copy)]
194pub struct BidiClassMask(u32);
195
196impl BidiClassMask {
197    /// `true` iff both masks have at `BidiClass` in common.
198    #[inline(always)]
199    pub fn intersects(self, other: BidiClassMask) -> bool {
200        self.0 & other.0 != 0
201    }
202}
203
204/// An adapter between a Unicode back end an the `idna` crate.
205pub struct Adapter {
206    mapper: Uts46Mapper,
207    canonical_combining_class: CanonicalCombiningClassMap,
208    general_category: CodePointMapDataBorrowed<'static, GeneralCategory>,
209    bidi_class: CodePointMapDataBorrowed<'static, icu_properties::BidiClass>,
210    joining_type: CodePointMapDataBorrowed<'static, icu_properties::JoiningType>,
211}
212
213#[cfg(feature = "compiled_data")]
214impl Default for Adapter {
215    fn default() -> Self {
216        Self::new()
217    }
218}
219
220impl Adapter {
221    /// Constructor using data compiled into the binary.
222    #[cfg(feature = "compiled_data")]
223    #[inline(always)]
224    pub const fn new() -> Self {
225        Self {
226            mapper: Uts46Mapper::new(),
227            canonical_combining_class: CanonicalCombiningClassMap::new(),
228            general_category: icu_properties::maps::general_category(),
229            bidi_class: icu_properties::maps::bidi_class(),
230            joining_type: icu_properties::maps::joining_type(),
231        }
232    }
233
234    /// `true` iff the Canonical_Combining_Class of `c` is Virama.
235    #[inline(always)]
236    pub fn is_virama(&self, c: char) -> bool {
237        self.canonical_combining_class.get(c) == CanonicalCombiningClass::Virama
238    }
239
240    /// `true` iff the General_Category of `c` is Mark, i.e. any of Nonspacing_Mark,
241    /// Spacing_Mark, or Enclosing_Mark.
242    #[inline(always)]
243    pub fn is_mark(&self, c: char) -> bool {
244        (general_category_to_mask(self.general_category.get(c)) & MARK_MASK) != 0
245    }
246
247    /// Returns the Bidi_Class of `c`.
248    #[inline(always)]
249    pub fn bidi_class(&self, c: char) -> BidiClass {
250        BidiClass(self.bidi_class.get(c))
251    }
252
253    /// Returns the Joining_Type of `c`.
254    #[inline(always)]
255    pub fn joining_type(&self, c: char) -> JoiningType {
256        JoiningType(self.joining_type.get(c))
257    }
258
259    /// See the [method of the same name in `icu_normalizer`][1] for the
260    /// exact semantics.
261    ///
262    /// [1]: https://docs.rs/icu_normalizer/latest/icu_normalizer/uts46/struct.Uts46Mapper.html#method.map_normalize
263    #[inline(always)]
264    pub fn map_normalize<'delegate, I: Iterator<Item = char> + 'delegate>(
265        &'delegate self,
266        iter: I,
267    ) -> impl Iterator<Item = char> + 'delegate {
268        self.mapper.map_normalize(iter)
269    }
270
271    /// See the [method of the same name in `icu_normalizer`][1] for the
272    /// exact semantics.
273    ///
274    /// [1]: https://docs.rs/icu_normalizer/latest/icu_normalizer/uts46/struct.Uts46Mapper.html#method.normalize_validate
275    #[inline(always)]
276    pub fn normalize_validate<'delegate, I: Iterator<Item = char> + 'delegate>(
277        &'delegate self,
278        iter: I,
279    ) -> impl Iterator<Item = char> + 'delegate {
280        self.mapper.normalize_validate(iter)
281    }
282}
idna_adapter/lib.rs

idna_adapter/
lib.rs
