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//===----------------------------------------------------------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2024 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
//
//===----------------------------------------------------------------------===//
#if swift(>=6)
public import SwiftSyntax
#else
import SwiftSyntax
#endif
public struct ConvertZeroParameterFunctionToComputedProperty: SyntaxRefactoringProvider {
public static func refactor(syntax: FunctionDeclSyntax, in context: ()) -> VariableDeclSyntax? {
guard syntax.signature.parameterClause.parameters.isEmpty,
let body = syntax.body
else { return nil }
let variableName = PatternSyntax(
IdentifierPatternSyntax(
leadingTrivia: syntax.funcKeyword.trailingTrivia,
identifier: syntax.name
)
)
let triviaFromParameters =
(syntax.signature.parameterClause.leftParen.trivia + syntax.signature.parameterClause.rightParen.trivia)
.droppingTrailingWhitespace
var variableType: TypeAnnotationSyntax?
if let returnClause = syntax.signature.returnClause {
variableType = TypeAnnotationSyntax(
colon: .colonToken(
leadingTrivia: triviaFromParameters + returnClause.arrow.leadingTrivia,
trailingTrivia: returnClause.arrow.trailingTrivia
),
type: returnClause.type
)
} else {
variableType = TypeAnnotationSyntax(
colon: .colonToken(
leadingTrivia: triviaFromParameters,
trailingTrivia: .space
),
type: TypeSyntax("Void").with(\.trailingTrivia, .space)
)
}
let accessorBlock = AccessorBlockSyntax(
leftBrace: body.leftBrace,
accessors: .getter(body.statements),
rightBrace: body.rightBrace
)
return VariableDeclSyntax(
modifiers: syntax.modifiers,
.var,
name: variableName,
type: variableType,
accessorBlock: accessorBlock
)
}
}
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