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//===----------------------------------------------------------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2020 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 LanguageServerProtocol
import SwiftSyntax
/// Scans a source file for classes or structs annotated with `@main` and returns a code lens for them.
final class SwiftCodeLensScanner: SyntaxVisitor {
/// The document snapshot of the syntax tree that is being walked.
private let snapshot: DocumentSnapshot
/// The collection of CodeLenses found in the document.
private var result: [CodeLens] = []
/// The map of supported commands and their client side command names
private let supportedCommands: [SupportedCodeLensCommand: String]
private init(snapshot: DocumentSnapshot, supportedCommands: [SupportedCodeLensCommand: String]) {
self.snapshot = snapshot
self.supportedCommands = supportedCommands
super.init(viewMode: .fixedUp)
}
/// Public entry point. Scans the syntax tree of the given snapshot for an `@main` annotation
/// and returns CodeLens's with Commands to run/debug the application.
public static func findCodeLenses(
in snapshot: DocumentSnapshot,
syntaxTreeManager: SyntaxTreeManager,
supportedCommands: [SupportedCodeLensCommand: String]
) async -> [CodeLens] {
guard snapshot.text.contains("@main") && !supportedCommands.isEmpty else {
// This is intended to filter out files that obviously do not contain an entry point.
return []
}
let syntaxTree = await syntaxTreeManager.syntaxTree(for: snapshot)
let visitor = SwiftCodeLensScanner(snapshot: snapshot, supportedCommands: supportedCommands)
visitor.walk(syntaxTree)
return visitor.result
}
override func visit(_ node: ClassDeclSyntax) -> SyntaxVisitorContinueKind {
node.attributes.forEach(self.captureLensFromAttribute)
return .skipChildren
}
override func visit(_ node: StructDeclSyntax) -> SyntaxVisitorContinueKind {
node.attributes.forEach(self.captureLensFromAttribute)
return .skipChildren
}
private func captureLensFromAttribute(attribute: AttributeListSyntax.Element) {
if attribute.trimmedDescription == "@main" {
let range = self.snapshot.absolutePositionRange(of: attribute.trimmedRange)
if let runCommand = supportedCommands[SupportedCodeLensCommand.run] {
// Return commands for running/debugging the executable.
// These command names must be recognized by the client and so should not be chosen arbitrarily.
self.result.append(
CodeLens(
range: range,
command: Command(title: "Run", command: runCommand, arguments: nil)
)
)
}
if let debugCommand = supportedCommands[SupportedCodeLensCommand.debug] {
self.result.append(
CodeLens(
range: range,
command: Command(title: "Debug", command: debugCommand, arguments: nil)
)
)
}
}
}
}
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