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//===----------------------------------------------------------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2022 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See https://swift.org/LICENSE.txt for license information
// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//
import GenUtils
func getLinkingConsonant(
from data: String
) -> [ClosedRange<UInt32>] {
var unflattened: [(ClosedRange<UInt32>, String)] = []
for line in data.split(separator: "\n") {
// Skip comments
guard !line.hasPrefix("#") else {
continue
}
let components = line.split(separator: ";")
// Get the property first because it may be one we don't care about.
let splitProperty = components[1].split(separator: "#")
let filteredProperty = splitProperty[0].filter { !$0.isWhitespace }
// We only care about Linking Consonant who is defined as 'Consonant'.
guard filteredProperty == "Consonant" else {
continue
}
// This rule only applies to the following scripts, so ensure that these
// scalars are from such scripts.
for script in ["Bengali", "Devanagari", "Gujarati", "Oriya", "Telugu", "Malayalam"] {
guard line.contains(script.uppercased()) else {
continue
}
break
}
let scalars: ClosedRange<UInt32>
let filteredScalars = components[0].filter { !$0.isWhitespace }
// If we have . appear, it means we have a legitimate range. Otherwise,
// it's a singular scalar.
if filteredScalars.contains(".") {
let range = filteredScalars.split(separator: ".")
scalars = UInt32(range[0], radix: 16)! ... UInt32(range[1], radix: 16)!
} else {
let scalar = UInt32(filteredScalars, radix: 16)!
scalars = scalar ... scalar
}
unflattened.append((scalars, "Consonant"))
}
return flatten(unflattened).map { $0.0 }
}
func emitLinkingConsonant(
_ data: [ClosedRange<UInt32>],
into result: inout String
) {
// 64 bit arrays * 8 bytes = .512 KB
var bitArrays: [BitArray] = .init(repeating: .init(size: 64), count: 64)
let chunkSize = 0x110000 / 64 / 64
var chunks: [Int] = []
for i in 0 ..< 64 * 64 {
let lower = i * chunkSize
let upper = lower + chunkSize - 1
let idx = i / 64
let bit = i % 64
for scalar in lower ... upper {
if data.contains(where: { $0.contains(UInt32(scalar)) }) {
chunks.append(i)
bitArrays[idx][bit] = true
break
}
}
}
// Remove the trailing 0s. Currently this reduces quick look size down to
// 96 bytes from 512 bytes.
var reducedBA = Array(bitArrays.reversed())
reducedBA = Array(reducedBA.drop {
$0.words == [0x0]
})
bitArrays = reducedBA.reversed()
// Keep a record of every rank for all the bitarrays.
var ranks: [UInt16] = []
// Record our quick look ranks.
var lastRank: UInt16 = 0
for (i, _) in bitArrays.enumerated() {
guard i != 0 else {
ranks.append(0)
continue
}
var rank = UInt16(bitArrays[i - 1].words[0].nonzeroBitCount)
rank += lastRank
ranks.append(rank)
lastRank = rank
}
// Insert our quick look size at the beginning.
var size = BitArray(size: 64)
size.words = [UInt64(bitArrays.count)]
bitArrays.insert(size, at: 0)
for chunk in chunks {
var chunkBA = BitArray(size: chunkSize)
let lower = chunk * chunkSize
let upper = lower + chunkSize
for scalar in lower ..< upper {
if data.contains(where: { $0.contains(UInt32(scalar)) }) {
chunkBA[scalar % chunkSize] = true
}
}
// Append our chunk bit array's rank.
var lastRank: UInt16 = 0
for (i, _) in chunkBA.words.enumerated() {
guard i != 0 else {
ranks.append(0)
continue
}
var rank = UInt16(chunkBA.words[i - 1].nonzeroBitCount)
rank += lastRank
ranks.append(rank)
lastRank = rank
}
bitArrays += chunkBA.words.map {
var ba = BitArray(size: 64)
ba.words = [$0]
return ba
}
}
emitCollection(
ranks,
name: "_swift_stdlib_linkingConsonant_ranks",
into: &result
)
emitCollection(
bitArrays,
name: "_swift_stdlib_linkingConsonant",
type: "__swift_uint64_t",
into: &result
) {
assert($0.words.count == 1)
return "0x\(String($0.words[0], radix: 16, uppercase: true))"
}
}
|
