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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 Foundation
import SwiftSyntax
/// A Rule is a linting or formatting pass that executes in a given context.
@_spi(Rules)
public protocol Rule {
/// The context in which the rule is executed.
var context: Context { get }
/// The human-readable name of the rule. This defaults to the type name.
static var ruleName: String { get }
/// Whether this rule is opt-in, meaning it is disabled by default.
static var isOptIn: Bool { get }
/// Creates a new Rule in a given context.
init(context: Context)
}
/// The part of a node where an emitted finding should be anchored.
@_spi(Rules)
public enum FindingAnchor {
/// The finding is anchored at the beginning of the node's actual content, skipping any leading
/// trivia.
case start
/// The finding is anchored at the beginning of the trivia piece at the given index in the node's
/// leading trivia.
case leadingTrivia(Trivia.Index)
/// The finding is anchored at the beginning of the trivia piece at the given index in the node's
/// trailing trivia.
case trailingTrivia(Trivia.Index)
}
extension Rule {
/// By default, the `ruleName` is just the name of the implementing rule class.
public static var ruleName: String { String("\(self)".split(separator: ".").last!) }
/// Emits the given finding.
///
/// - Parameters:
/// - message: The finding message to emit.
/// - node: The syntax node to which the finding should be attached. The finding's location will
/// be set to the start of the node (excluding leading trivia, unless `leadingTriviaIndex` is
/// provided).
/// - anchor: The part of the node where the finding should be anchored. Defaults to the start
/// of the node's content (after any leading trivia).
/// - notes: An array of notes that provide additional detail about the finding.
public func diagnose<SyntaxType: SyntaxProtocol>(
_ message: Finding.Message,
on node: SyntaxType?,
severity: Finding.Severity? = nil,
anchor: FindingAnchor = .start,
notes: [Finding.Note] = []
) {
let syntaxLocation: SourceLocation?
if let node = node {
switch anchor {
case .start:
syntaxLocation = node.startLocation(converter: context.sourceLocationConverter)
case .leadingTrivia(let index):
syntaxLocation = node.startLocation(
ofLeadingTriviaAt: index,
converter: context.sourceLocationConverter
)
case .trailingTrivia(let index):
syntaxLocation = node.startLocation(
ofTrailingTriviaAt: index,
converter: context.sourceLocationConverter
)
}
} else {
syntaxLocation = nil
}
let category = RuleBasedFindingCategory(ruleType: type(of: self), severity: severity)
context.findingEmitter.emit(
message,
category: category,
location: syntaxLocation.flatMap(Finding.Location.init),
notes: notes
)
}
}
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