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
58
59
60
61
62
63
64
|
//===----------------------------------------------------------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2025 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 Foundation
import SwiftParser
import SwiftSyntax
/// AddOneToIntegerLiterals will visit each token in the Syntax tree, and
/// (if it is an integer literal token) add 1 to the integer and return the
/// new integer literal token.
///
/// For example, it will turn
/// ```
/// let x = 2
/// let y = 3_000
/// ```
/// into
/// ```
/// let x = 3
/// let y = 3001
/// ```
///
private class AddOneToIntegerLiterals: SyntaxRewriter {
override func visit(_ token: TokenSyntax) -> TokenSyntax {
// Only transform integer literals.
guard case .integerLiteral(let text) = token.tokenKind else {
return token
}
// Remove underscores from the original text.
let integerText = String(text.filter { ("0"..."9").contains($0) })
// Parse out the integer.
let int = Int(integerText)!
// Create a new integer literal token with `int + 1` as its text.
var newIntegerLiteralToken = token
newIntegerLiteralToken.tokenKind = .integerLiteral("\(int + 1)")
// Return the new integer literal.
return newIntegerLiteralToken
}
}
@main
struct Main {
static func main() throws {
let file = CommandLine.arguments[1]
let url = URL(fileURLWithPath: file)
let source = try String(contentsOf: url, encoding: .utf8)
let sourceFile = Parser.parse(source: source)
let incremented = AddOneToIntegerLiterals().visit(sourceFile)
print(incremented)
}
}
|
