1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
|
//===----------------------------------------------------------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2021-2022 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
//
//===----------------------------------------------------------------------===//
// Disabled because Prototypes is a test target.
#if false
struct PEGParticipant: Participant {
static var name: String { "PEG" }
}
import Prototypes
private func graphemeBreakPropertyData(forLine line: String) -> GraphemeBreakEntry? {
typealias Pattern = PEG<Character>.Pattern
/*
# This is a comment
0600..0605 ; Prepend # Cf [6] ARABIC NUMBER SIGN..ARABIC NUMBER MARK ABOVE
06DD ; Prepend # Cf ARABIC END OF AYAH
Decl -> Scalar (".." Scalar)? Space+ ";" Space Property Space "#" .* success
Scalar -> \h{4, 6}
Space -> \s
Property -> \w+
*/
let scalar = Pattern.repeatRange(.charactetSet(\.isHexDigit), atLeast: 4, atMost: 6)
let space = Pattern.charactetSet(\.isWhitespace)
let property = Pattern.oneOrMore(.charactetSet(\.isLetter))
let entry = Pattern(
scalar, .zeroOrOne(Pattern("..", scalar)), .repeat(space, atLeast: 1),
";", space, property, space, "#", .many(.any), .success)
let program = PEG.Program(start: "Entry", environment: ["Entry": entry])
let vm = program.compile(for: String.self)
let engine = try! program.transpile()
_ = (vm, engine)
fatalError("Unsupported")
// let resultVM = vm.consume(line)
// let resultTrans = engine.consume(line)
//
// precondition(resultVM == resultTrans)
}
#endif
|
