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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
/// Test helper for looking up source location mappings and contents of source files in a project,
/// as well as managing modifications to the sources.
public final class TestSources {
/// The root source directory.
public var rootDirectory: URL
/// The source contents.
public let sourceCache: SourceFileCache = SourceFileCache()
/// The map of known source locations.
public var locations: [String: TestLocation]
public init(rootDirectory: URL) throws {
self.rootDirectory = rootDirectory
self.locations = try scanLocations(rootDirectory: rootDirectory, sourceCache: sourceCache)
}
public struct ChangeSet {
public var remove: [URL] = []
public var rename: [(URL, URL)] = []
public var write: [(URL, String)] = []
public func isDirty(_ url: URL) -> Bool {
return remove.contains(url)
|| rename.contains { $0 == url || $1 == url }
|| write.contains { $0.0 == url }
}
}
public struct ChangeBuilder {
public var changes: ChangeSet = ChangeSet()
var seen: Set<URL> = []
public mutating func write(_ content: String, to url: URL) {
precondition(seen.insert(url).inserted, "multiple edits to same file")
changes.write.append((url, content))
}
public mutating func remove(_ url: URL) {
precondition(seen.insert(url).inserted, "multiple edits to same file")
changes.remove.append(url)
}
public mutating func rename(from: URL, to: URL) {
precondition(seen.insert(from).inserted && seen.insert(to).inserted, "multiple edits to same file")
changes.rename.append((from, to))
}
}
public func apply(_ changes: ChangeSet) throws {
for (url, content) in changes.write {
guard let data = content.data(using: .utf8) else {
fatalError("failed to encode edited contents to utf8")
}
try data.write(to: url)
sourceCache.set(url, to: content)
}
let fm = FileManager.default
for (from, to) in changes.rename {
try fm.moveItem(at: from, to: to)
sourceCache.set(to, to: sourceCache.cache[from])
sourceCache.set(from, to: nil)
}
for url in changes.remove {
try fm.removeItem(at: url)
sourceCache.set(url, to: nil)
}
// FIXME: update incrementally without rescanning everything.
locations = try scanLocations(rootDirectory: rootDirectory, sourceCache: sourceCache)
}
/// Perform a set of edits (modifications, removals, renames) to the sources and return the
/// change set. This modifies the files on disk.
///
/// * parameters:
/// * block: Callback to collect the desired changes.
/// * returns: The ChangeSet corresponding to these changes.
/// * throws: Any file system errors seen while modifying the sources. If this happens, the state
/// of the source files is not defined.
public func edit(_ block: (_ builder: inout ChangeBuilder) throws -> ()) throws -> ChangeSet {
var builder = ChangeBuilder()
try block(&builder)
try apply(builder.changes)
return builder.changes
}
}
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