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//===----------------------------------------------------------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2021 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
//
//===----------------------------------------------------------------------===//
/// Emits findings encountered during linting or formatting.
///
/// The finding emitter is initialized with an optional consumer function that will be invoked each
/// time a finding is emitted when linting or formatting the syntax tree. This function is expected
/// to act on the finding -- for example, by printing it as a diagnostic to standard error.
///
/// If the consumer function is nil, then the `emit` function is a no-op. This allows callers, such
/// as lint/format rules and the pretty-printer, to emit findings unconditionally, without wrapping
/// each call in a check about whether the client is interested in receiving those findings or not.
final class FindingEmitter {
/// An optional function that will be called and passed a finding each time one is emitted.
private let consumer: ((Finding) -> Void)?
/// Creates a new finding emitter with the given consumer function.
///
/// - Parameter consumer: An optional function that will be called and passed a finding each time
/// one is emitted.
public init(consumer: ((Finding) -> Void)?) {
self.consumer = consumer
}
/// Emits a new finding.
///
/// - Parameters:
/// - message: A descriptive message about the finding.
/// - category: A value that groups the finding into a category.
/// - location: The source location where the finding was encountered. In rare cases where the
/// finding does not apply to a particular location in the source code, this may be nil.
/// - notes: Notes that provide additional detail about the finding, possibly referring to other
/// related locations in the source file.
public func emit(
_ message: Finding.Message,
category: FindingCategorizing,
location: Finding.Location? = nil,
notes: [Finding.Note] = []
) {
guard let consumer = self.consumer else { return }
// TODO: Provide a way via the formatter configuration for users to customize the severity of
// findings based on their category, falling back to the default if it isn't overridden.
consumer(
Finding(
category: category,
message: message,
severity: category.defaultSeverity,
location: location,
notes: notes))
}
}
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