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b189084f4f
* Add a Unicode data generator util package * Add a common GenUtils library * Use string methods for reading/writing files
76 lines
2.2 KiB
Swift
76 lines
2.2 KiB
Swift
//===----------------------------------------------------------------------===//
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//
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// This source file is part of the Swift.org open source project
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//
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// Copyright (c) 2021 Apple Inc. and the Swift project authors
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// Licensed under Apache License v2.0 with Runtime Library Exception
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//
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// See https://swift.org/LICENSE.txt for license information
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// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
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//
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//===----------------------------------------------------------------------===//
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// Takes an unflattened array of scalar ranges and some Equatable property and
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// attempts to merge ranges who share the same Equatable property. E.g:
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//
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// 0x0 ... 0xA = .control
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// 0xB ... 0xB = .control
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// 0xC ... 0x1F = .control
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//
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// into:
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//
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// 0x0 ... 0x1F = .control
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public func flatten<T: Equatable>(
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_ unflattened: [(ClosedRange<UInt32>, T)]
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) -> [(ClosedRange<UInt32>, T)] {
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var result: [(ClosedRange<UInt32>, T)] = []
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for elt in unflattened.sorted(by: { $0.0.lowerBound < $1.0.lowerBound }) {
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guard !result.isEmpty, result.last!.1 == elt.1 else {
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result.append(elt)
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continue
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}
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if elt.0.lowerBound == result.last!.0.upperBound + 1 {
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result[result.count - 1].0 = result.last!.0.lowerBound ... elt.0.upperBound
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} else {
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result.append(elt)
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}
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}
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return result
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}
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// Takes an unflattened array of scalars and some Equatable property and
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// attempts to merge scalars into ranges who share the same Equatable
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// property. E.g:
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//
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// 0x9 = .control
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// 0xA = .control
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// 0xB = .control
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// 0xC = .control
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//
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// into:
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//
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// 0x9 ... 0xC = .control
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public func flatten<T: Equatable>(
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_ unflattened: [(UInt32, T)]
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) -> [(ClosedRange<UInt32>, T)] {
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var result: [(ClosedRange<UInt32>, T)] = []
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for elt in unflattened.sorted(by: { $0.0 < $1.0 }) {
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guard !result.isEmpty, result.last!.1 == elt.1 else {
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result.append((elt.0 ... elt.0, elt.1))
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continue
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}
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if elt.0 == result.last!.0.upperBound + 1 {
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result[result.count - 1].0 = result.last!.0.lowerBound ... elt.0
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} else {
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result.append((elt.0 ... elt.0, elt.1))
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}
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}
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return result
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}
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