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//===----------------------------------------------------------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2023 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
import SwiftSyntaxBuilder
import SyntaxSupport
import Utils
let lookupTable = ArrayExprSyntax(leftSquare: .leftSquareToken(trailingTrivia: .newline)) {
for keyword in Keyword.allCases {
ArrayElementSyntax(expression: ExprSyntax("\(literal: keyword.spec.name)"), trailingComma: .commaToken())
}
}
let keywordFile = SourceFileSyntax(leadingTrivia: copyrightHeader) {
try! EnumDeclSyntax(
"""
public enum Keyword: UInt8, Hashable, Sendable
"""
) {
for keyword in Keyword.allCases {
DeclSyntax(
"""
\(keyword.spec.apiAttributes)\
case \(keyword.spec.varOrCaseName.backtickedIfNeeded)
"""
)
}
try! InitializerDeclSyntax("@_spi(RawSyntax) public init?(_ text: SyntaxText)") {
try! SwitchExprSyntax("switch text.count") {
for (length, keywords) in keywordsByLength() {
SwitchCaseSyntax("case \(raw: length):") {
try! SwitchExprSyntax("switch text") {
for keyword in keywords {
SwitchCaseSyntax("case \(literal: keyword.name):") {
ExprSyntax("self = .\(keyword.varOrCaseName)")
}
}
SwitchCaseSyntax("default: return nil")
}
}
}
SwitchCaseSyntax("default: return nil")
}
}
DeclSyntax(
"""
/// This is really unfortunate. Really, we should have a `switch` in
/// `Keyword.defaultText` to return the keyword's kind but the constant lookup
/// table is significantly faster. Ideally, we could also get the compiler to
/// constant-evaluate `Keyword.spi.defaultText` to a ``SyntaxText`` but I don't
/// see how that's possible right now.
private static let keywordTextLookupTable: [SyntaxText] = \(lookupTable)
"""
)
DeclSyntax(
"""
@_spi(RawSyntax)
public var defaultText: SyntaxText {
return Keyword.keywordTextLookupTable[Int(self.rawValue)]
}
"""
)
}
}
|
