/
EnvLog.swift
159 lines (122 loc) · 3.66 KB
/
EnvLog.swift
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import Foundation
import ExpressiveFoundation
public class EnvLog: StdEmitterType, CustomStringConvertible {
public struct DidChange: EventType {
}
public let origin: String
public private(set) var errors: [String] = []
public private(set) var warnings: [String] = []
private var shallowErrors: [String] = []
private var shallowWarnings: [String] = []
private var parents: [WeakEnvLogRef] = []
public var hasErrors: Bool {
return !errors.isEmpty
}
private var children: [EnvLog] = [] {
didSet {
let newValue = children
for child in oldValue {
if nil == newValue.find({ $0 === child }) {
child.removeParent(self)
}
}
for child in newValue {
if nil == oldValue.find({ $0 === child }) {
child.addParent(self)
}
}
}
}
public var annotatedErrors: [String] {
return errors.map { annotate($0) }
}
public var annotatedWarnings: [String] {
return warnings.map { annotate($0) }
}
public var description: String {
if errors.isEmpty && warnings.isEmpty {
return "(empty)"
}
var lines: [String] = []
if !origin.isEmpty {
lines += ["\(origin):"]
}
lines += errors.map { "E: \($0)" }
lines += warnings.map { "W: \($0)" }
return lines.joinWithSeparator("\n")
}
public init(origin: String) {
self.origin = origin
}
public func beginUpdating() -> EnvLogBuilder {
return EnvLogBuilder(log: self)
}
private func update(fromBuilder builder: EnvLogBuilder) {
shallowErrors = builder.errors
shallowWarnings = builder.warnings
children = builder.children
didChange()
}
private func didChange() {
errors = shallowErrors + children.flatMap { $0.annotatedErrors }
warnings = shallowWarnings + children.flatMap { $0.annotatedWarnings }
emit(DidChange())
for parentRef in parents {
if let parent = parentRef.value {
parent.didChange()
}
}
}
private func annotate(message: String) -> String {
if origin.isEmpty {
return message
} else {
return "\(origin): \(message)"
}
}
private func addParent(parent: EnvLog) {
parents.append(WeakEnvLogRef(value: parent))
}
private func removeParent(parent: EnvLog) {
if let idx = parents.indexOf({ $0.value === parent }) {
parents.removeAtIndex(idx)
}
}
public var _listeners = EventListenerStorage()
}
public class EnvLogBuilder {
private let log: EnvLog
private var errors: [String] = []
private var warnings: [String] = []
private var children: [EnvLog] = []
private init(log: EnvLog) {
self.log = log
}
deinit {
commit()
}
public func addChild(log: EnvLog) {
children.append(log)
}
public func addError(message: String, _ details: [String] = []) {
errors.append(message)
}
public func addError(error: ErrorType) {
errors.append("\(error)")
}
public func addError(message: String, _ error: ErrorType) {
errors.append("\(message): \(error)")
}
public func addWarning(message: String, _ details: [String] = []) {
warnings.append(message)
}
public func commit() {
log.update(fromBuilder: self)
}
}
private struct WeakEnvLogRef {
weak var value: EnvLog?
init (value: EnvLog) {
self.value = value
}
}