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//===----------------------------------------------------------------------===//
//
// This source file is part of the Swift open source project
//
// Copyright (c) 2018-2021 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See http://swift.org/LICENSE.txt for license information
// See http://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//
extension Version: ExpressibleByStringLiteral {
/// Initializes a version struct with the provided string literal.
///
/// - Parameter version: A string literal to use for creating a new version struct.
public init(stringLiteral value: String) {
if let version = Version(value) {
self = version
} else {
// If version can't be initialized using the string literal, report
// the error and initialize with a dummy value. This is done to
// report error to the invoking tool (like swift build) gracefully
// rather than just crashing.
errors.append("Invalid semantic version string '\(value)'")
self.init(0, 0, 0)
}
}
/// Initializes a version struct with the provided extended grapheme cluster.
///
/// - Parameter version: An extended grapheme cluster to use for creating a new
/// version struct.
public init(extendedGraphemeClusterLiteral value: String) {
self.init(stringLiteral: value)
}
/// Initializes a version struct with the provided Unicode string.
///
/// - Parameter version: A Unicode string to use for creating a new version struct.
public init(unicodeScalarLiteral value: String) {
self.init(stringLiteral: value)
}
}
extension Version: LosslessStringConvertible {
/// Initializes a version struct with the provided version string.
/// - Parameter version: A version string to use for creating a new version struct.
public init?(_ versionString: String) {
// SemVer 2.0.0 allows only ASCII alphanumerical characters and "-" in the version string, except for "." and "+" as delimiters. ("-" is used as a delimiter between the version core and pre-release identifiers, but it's allowed within pre-release and metadata identifiers as well.)
// Alphanumerics check will come later, after each identifier is split out (i.e. after the delimiters are removed).
guard versionString.allSatisfy(\.isASCII) else { return nil }
let metadataDelimiterIndex = versionString.firstIndex(of: "+")
// SemVer 2.0.0 requires that pre-release identifiers come before build metadata identifiers
let prereleaseDelimiterIndex = versionString[..<(metadataDelimiterIndex ?? versionString.endIndex)].firstIndex(of: "-")
let versionCore = versionString[..<(prereleaseDelimiterIndex ?? metadataDelimiterIndex ?? versionString.endIndex)]
let versionCoreIdentifiers = versionCore.split(separator: ".", omittingEmptySubsequences: false)
guard
versionCoreIdentifiers.count == 3,
// Major, minor, and patch versions must be ASCII numbers, according to the semantic versioning standard.
// Converting each identifier from a substring to an integer doubles as checking if the identifiers have non-numeric characters.
let major = Int(versionCoreIdentifiers[0]),
let minor = Int(versionCoreIdentifiers[1]),
let patch = Int(versionCoreIdentifiers[2])
else { return nil }
self.major = major
self.minor = minor
self.patch = patch
if let prereleaseDelimiterIndex {
let prereleaseStartIndex = versionString.index(after: prereleaseDelimiterIndex)
let prereleaseIdentifiers = versionString[prereleaseStartIndex..<(metadataDelimiterIndex ?? versionString.endIndex)].split(separator: ".", omittingEmptySubsequences: false)
guard prereleaseIdentifiers.allSatisfy({ $0.allSatisfy({ $0.isLetter || $0.isNumber || $0 == "-" })}) else { return nil }
self.prereleaseIdentifiers = prereleaseIdentifiers.map { String($0) }
} else {
self.prereleaseIdentifiers = []
}
if let metadataDelimiterIndex {
let metadataStartIndex = versionString.index(after: metadataDelimiterIndex)
let buildMetadataIdentifiers = versionString[metadataStartIndex...].split(separator: ".", omittingEmptySubsequences: false)
guard buildMetadataIdentifiers.allSatisfy({ $0.allSatisfy({ $0.isLetter || $0.isNumber || $0 == "-" })}) else { return nil }
self.buildMetadataIdentifiers = buildMetadataIdentifiers.map { String($0) }
} else {
self.buildMetadataIdentifiers = []
}
}
}
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