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//===----------------------------------------------------------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2019 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 SwiftSyntax
/// All identifiers must be ASCII.
///
/// Lint: If an identifier contains non-ASCII characters, a lint error is raised.
@_spi(Rules)
public final class IdentifiersMustBeASCII: SyntaxLintRule {
public override func visit(_ node: IdentifierPatternSyntax) -> SyntaxVisitorContinueKind {
let identifier = node.identifier.text
let invalidCharacters = identifier.unicodeScalars.filter { !$0.isASCII }.map { $0.description }
if !invalidCharacters.isEmpty {
diagnose(.nonASCIICharsNotAllowed(invalidCharacters, identifier), on: node)
}
return .skipChildren
}
}
extension Finding.Message {
fileprivate static func nonASCIICharsNotAllowed(
_ invalidCharacters: [String],
_ identifierName: String
) -> Finding.Message {
"""
remove non-ASCII characters from '\(identifierName)': \
\(invalidCharacters.joined(separator: ", "))
"""
}
}
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