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IDNAValidationDatabase.swift
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IDNAValidationDatabase.swift
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// Copyright The swift-url Contributors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#if WEBURL_UNICODE_PARSE_N_PRINT
/// This is what the generation script uses to interface with the (internal) types used by this module.
///
/// There are 2 operations: parsing a database from the contents of some files, and printing the database
/// as Swift source code. That's it.
///
public struct IDNAValidationDatabase {
internal var codePointDatabase: CodePointDatabase<IDNAValidationData>
}
// --------------------------------------------
// MARK: - Printing
// --------------------------------------------
extension IDNAValidationDatabase {
public func printAsSwiftSourceCode(name: String) -> String {
let output = codePointDatabase.printAsSwiftSourceCode(
name: name,
using: DefaultFormatter<IDNAValidationData>.self
)
precondition(output.last == "\n")
precondition(output.dropLast().last != "\n")
return output
}
}
// --------------------------------------------
// MARK: - Creation
// --------------------------------------------
extension IDNAValidationDatabase {
public init(
mappingDB: IDNAMappingDatabase,
derivedBidiClassTxt: String,
derivedJoiningTypeTxt: String
) {
// - Parse Data Files
var bidiData = SegmentedLine<UInt32, RawBidiClass>(
bounds: Range(0...0x10_FFFF), value: .L
)
var joiningData = SegmentedLine<UInt32, RawJoiningType>(
bounds: Range(0...0x10_FFFF), value: .U
)
do {
for line in derivedBidiClassTxt.split(separator: "\n").filter({ !$0.starts(with: "#") }) {
let rawDataString = line.prefix { $0 != "#" }
let comment = line[rawDataString.endIndex...].dropFirst()
guard let entry = ParsingHelpers.CodePointsToProperty<RawBidiClass>(parsing: rawDataString) else {
fatalError(
"""
⚠️ Failed to Parse Entry in Bidi_Class Data! ⚠️
line: \(line)
rawDataString: \(rawDataString)
comment: \(comment)
"""
)
}
bidiData.set(Range(entry.codePoints), to: entry.value)
}
bidiData.combineSegments()
}
do {
for line in derivedJoiningTypeTxt.split(separator: "\n").filter({ !$0.starts(with: "#") }) {
let rawDataString = line.prefix { $0 != "#" }
let comment = line[rawDataString.endIndex...].dropFirst()
guard let entry = ParsingHelpers.CodePointsToProperty<RawJoiningType>(parsing: rawDataString) else {
fatalError(
"""
⚠️ Failed to Parse Entry in Joining_Type Data! ⚠️
line: \(line)
rawDataString: \(rawDataString)
comment: \(comment)
"""
)
}
joiningData.set(Range(entry.codePoints), to: entry.value)
}
joiningData.combineSegments()
}
// - Create a merged data-set.
// a. Start with the Bidi_Class data.
var validationData: SegmentedLine<UInt32, IDNAValidationData.ValidationFlags> = bidiData.mapValues { parsedInfo in
IDNAValidationData.ValidationFlags(
bidiInfo: parsedInfo.simplified(),
joiningType: .other, isVirama: false, isMark: false // defaults.
)
}
// b. Insert Joining_Type data.
for (range, parsedJoinType) in joiningData.segments {
let simplified = parsedJoinType.simplified()
validationData.modify(range) { $0.joiningType = simplified }
}
// c. Mark virama and marks.
for codePoint in 0...(0x10_FFFF as UInt32) {
guard let scalar = Unicode.Scalar(codePoint) else { continue }
// TODO: We should get this data from a stable source.
let isVirama = (scalar.properties.canonicalCombiningClass == .virama)
let isMark = [.spacingMark, .nonspacingMark, .enclosingMark].contains(scalar.properties.generalCategory)
if isVirama || isMark {
validationData.modify(codePoint..<(codePoint + 1)) {
$0.isVirama = isVirama
$0.isMark = isMark
}
}
}
// - Create a DB out of the combined data.
validationData.combineSegments()
self.codePointDatabase = validationData.generateTable(
IDNAValidationData.self,
mapAsciiValue: { $0 },
mapUnicodeValue: { $0 }
)
}
}
private enum RawBidiClass: String {
case L = "L"
case R = "R"
case EN = "EN"
case ES = "ES"
case ET = "ET"
case AN = "AN"
case CS = "CS"
case B = "B"
case S = "S"
case WS = "WS"
case ON = "ON"
case BN = "BN"
case NSM = "NSM"
case AL = "AL"
case LRO = "LRO"
case RLO = "RLO"
case LRE = "LRE"
case RLE = "RLE"
case PDF = "PDF"
case LRI = "LRI"
case RLI = "RLI"
case FSI = "FSI"
case PDI = "PDI"
func simplified() -> IDNAValidationData.ValidationFlags.BidiInfo {
// Here's the Bidi rule (it's actually 6 rules).
// We don't actually need all the Bidi_Class data for it:
//
// 1. The first character must be a character with Bidi property L, R,
// or AL. If it has the R or AL property, it is an RTL label; if it
// has the L property, it is an LTR label.
//
// 2. In an RTL label, only characters with the Bidi properties R, AL,
// AN, EN, ES, CS, ET, ON, BN, or NSM are allowed.
//
// 3. In an RTL label, the end of the label must be a character with
// Bidi property R, AL, EN, or AN, followed by zero or more
// characters with Bidi property NSM.
//
// 4. In an RTL label, if an EN is present, no AN may be present, and
// vice versa.
//
// 5. In an LTR label, only characters with the Bidi properties L, EN,
// ES, CS, ET, ON, BN, or NSM are allowed.
//
// 6. In an LTR label, the end of the label must be a character with
// Bidi property L or EN, followed by zero or more characters with
// Bidi property NSM.
// swift-format-ignore
switch self {
case .L: return .L // For 1, 5, 6
case .R, .AL: return .RorAL // For 1, 2, 3
case .AN: return .AN // For 2, 4
case .EN: return .EN // For 2, 4, 5
case .ES, .CS, .ET, .ON, .BN: return .ESorCSorETorONorBN // For 2, 5
case .NSM: return .NSM // For 2, 3, 5, 6
default: return .disallowed // Everything else
}
}
}
private enum RawJoiningType: String {
case C = "C"
case D = "D"
case R = "R"
case L = "L"
case T = "T"
case U = "U"
func simplified() -> IDNAValidationData.ValidationFlags.JoiningType {
switch self {
case .L: return .L
case .R: return .R
case .D: return .D
case .T: return .T
default: return .other
}
}
}
#endif // WEBURL_UNICODE_PARSE_N_PRINT