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Merge pull request #1073 from marcelofabri/cache
Cache implementation
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,119 @@ | ||
| // | ||
| // LinterCache.swift | ||
| // SwiftLint | ||
| // | ||
| // Created by Marcelo Fabri on 12/27/16. | ||
| // Copyright © 2016 Realm. All rights reserved. | ||
| // | ||
|
|
||
| import Foundation | ||
| import SourceKittenFramework | ||
|
|
||
| public enum LinterCacheError: Error { | ||
| case invalidFormat | ||
| case differentVersion | ||
| case differentConfiguration | ||
| } | ||
|
|
||
| public final class LinterCache { | ||
| private var cache: [String: Any] | ||
| private let lock = NSLock() | ||
|
|
||
| public init(currentVersion: Version = .current, configurationHash: Int? = nil) { | ||
| cache = [ | ||
| "version": currentVersion.value, | ||
| "files": [:] | ||
| ] | ||
| cache["configuration_hash"] = configurationHash | ||
| } | ||
|
|
||
| public init(cache: Any, currentVersion: Version = .current, configurationHash: Int? = nil) throws { | ||
| guard let dictionary = cache as? [String: Any] else { | ||
| throw LinterCacheError.invalidFormat | ||
| } | ||
|
|
||
| guard let version = dictionary["version"] as? String, version == currentVersion.value else { | ||
| throw LinterCacheError.differentVersion | ||
| } | ||
|
|
||
| if dictionary["configuration_hash"] as? Int != configurationHash { | ||
| throw LinterCacheError.differentConfiguration | ||
| } | ||
|
|
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| self.cache = dictionary | ||
| } | ||
|
|
||
| public convenience init(contentsOf url: URL, currentVersion: Version = .current, | ||
| configurationHash: Int? = nil) throws { | ||
| let data = try Data(contentsOf: url) | ||
| let json = try JSONSerialization.jsonObject(with: data, options: []) | ||
| try self.init(cache: json, currentVersion: currentVersion, | ||
| configurationHash: configurationHash) | ||
| } | ||
|
|
||
| public func cache(violations: [StyleViolation], forFile file: String, fileHash: Int) { | ||
| lock.lock() | ||
| var filesCache = (cache["files"] as? [String: Any]) ?? [:] | ||
| filesCache[file] = [ | ||
| "violations": violations.map(dictionary(for:)), | ||
| "hash": fileHash | ||
| ] | ||
| cache["files"] = filesCache | ||
| lock.unlock() | ||
| } | ||
|
|
||
| public func violations(forFile file: String, hash: Int) -> [StyleViolation]? { | ||
| lock.lock() | ||
|
|
||
| guard let filesCache = cache["files"] as? [String: Any], | ||
| let entry = filesCache[file] as? [String: Any], | ||
| let cacheHash = entry["hash"] as? Int, | ||
| cacheHash == hash, | ||
| let violations = entry["violations"] as? [[String: Any]] else { | ||
| lock.unlock() | ||
| return nil | ||
| } | ||
|
|
||
| lock.unlock() | ||
| return violations.flatMap { StyleViolation.from(cache: $0, file: file) } | ||
| } | ||
|
|
||
| public func save(to url: URL) throws { | ||
| lock.lock() | ||
| let json = toJSON(cache) | ||
| lock.unlock() | ||
| try json.write(to: url, atomically: true, encoding: .utf8) | ||
| } | ||
|
|
||
| private func dictionary(for violation: StyleViolation) -> [String: Any] { | ||
| return [ | ||
| "line": violation.location.line ?? NSNull() as Any, | ||
| "character": violation.location.character ?? NSNull() as Any, | ||
| "severity": violation.severity.rawValue, | ||
| "type": violation.ruleDescription.name, | ||
| "rule_id": violation.ruleDescription.identifier, | ||
| "reason": violation.reason | ||
| ] | ||
| } | ||
| } | ||
|
|
||
| extension StyleViolation { | ||
| fileprivate static func from(cache: [String: Any], file: String) -> StyleViolation? { | ||
| guard let severity = (cache["severity"] as? String).flatMap({ ViolationSeverity(rawValue: $0) }), | ||
| let name = cache["type"] as? String, | ||
| let ruleId = cache["rule_id"] as? String, | ||
| let reason = cache["reason"] as? String else { | ||
| return nil | ||
| } | ||
|
|
||
| let line = cache["line"] as? Int | ||
| let character = cache["character"] as? Int | ||
|
|
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| let ruleDescription = RuleDescription(identifier: ruleId, name: name, description: reason) | ||
| let location = Location(file: file, line: line, character: character) | ||
| let violation = StyleViolation(ruleDescription: ruleDescription, severity: severity, | ||
| location: location, reason: reason) | ||
|
|
||
| return violation | ||
| } | ||
| } |
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