Configuration Structs

CHANGELOG.md

@@ -6,6 +6,14 @@
   `[String: SourceKitRepresentable]`.  
   [JP Simard](https://github.com/jpsim)
 
+* `VariableNameMinLengthRule` and `VariableNameMaxLengthRule` have been
+  removed. `VariableNameRule` now has this functionality.  
+  [Scott Hoyt](https://github.com/scottrhoyt)
+
+* `ViolationLevelRule` has been removed. This functionality is now provided
+  by `ConfigProviderRule` and `SeverityLevelsConfig`.  
+  [Scott Hoyt](https://github.com/scottrhoyt)
+
 ##### Enhancements
 
 * TypeBodyLengthRule now does not count comment or whitespace lines.  
@@ -16,6 +24,20 @@
   [Marcelo Fabri](https://github.com/marcelofabri)
   [#258](https://github.com/realm/SwiftLint/issues/258)
 
+* All `Rule`s are now configurable in at least their severity: `SeverityConfig`  
+  [Scott Hoyt](https://github.com/scottrhoyt)
+  [#371](https://github.com/realm/SwiftLint/issues/371)
+  [#130](https://github.com/realm/SwiftLint/issues/130)
+  [#268](https://github.com/realm/SwiftLint/issues/268)
+
+* `TypeNameRule` and `VariableNameRule` conform to `ConfigProviderRule` using
+   `NameConfig` to support `min_length`, `max_length`, and `excluded` names.  
+   [Scott Hoyt](https://github.com/scottrhoyt)
+   [#388](https://github.com/realm/SwiftLint/issues/388)
+   [#259](https://github.com/realm/SwiftLint/issues/259)
+   [#191](https://github.com/realm/SwiftLint/issues/191)
+
+
 ##### Bug Fixes
 
 * Fix crash caused by infinite recursion when using nested config files.  

CONTRIBUTING.md

@@ -22,37 +22,56 @@ those test cases in the unit tests directly. This makes it easier to understand
 what rules do by reading their source, and simplifies adding more test cases
 over time.
 
-### `ConfigurableRule`
+### `ConfigProviderRule`
 
 If your rule supports user-configurable options via `.swiftlint.yml`, you can
-accomplish this by conforming to `ConfigurableRule`:
-
-* `init?(config: AnyObject)` will be passed the result of parsing the value
-  from `.swiftlint.yml` associated with your rule's `identifier` as a key (if
-  present).
-* `config` may be of any type supported by YAML (e.g. `Int`, `String`, `Array`,
-  `Dictionary`, etc.).
-* This initializer must fail if it does not understand the configuration, or
-  it cannot be fully initialized with the configuration.
-* If this initializer fails, your rule will be initialized with its default
-  values by calling `init()`.
-
-See [VariableNameMinLengthRule](https://github.com/realm/SwiftLint/blob/647371517e57de3499a77781e45f181605b21045/Source/SwiftLintFramework/Rules/VariableNameMinLengthRule.swift)
-for an example that supports the following configurations:
+accomplish this by conforming to `ConfigProviderRule`. You must provide a
+configuration object via the `config` property:
+
+* The object provided must conform to `RuleConfig`.
+* There are several provided `RuleConfig`s that cover the common patterns like
+  configuring violation severity, violation severity levels, and evaluating
+  names.
+* If none of the provided `RuleConfig`s are applicable, you can create one
+  specifically for your rule.
+
+See [`ForceCastRule`](https://github.com/realm/SwiftLint/blob/master/Source/SwiftLintFramework/Rules/ForceCastRule.swift)
+for a rule that allows severity configuration,
+[`FileLengthRule`](https://github.com/realm/SwiftLint/blob/master/Source/SwiftLintFramework/Rules/FileLengthRule.swift)
+for a rule that has multiple severity levels,
+[`VariableNameRule`](https://github.com/realm/SwiftLint/blob/master/Source/SwiftLintFramework/Rules/VariableNameRule.swift)
+for a rule that allows name evaluation configuration:
 
 ``` yaml
-variable_name_min_length: 3
+force_cast: warning
 
-variable_name_min_length:
-  - 3
-  - 2
+file_length:
+  warning: 800
+  error: 1200
 
-variable_name_min_length:
-  warning: 3
-  error: 2
+variable_name:
+  min_length:
+    warning: 3
+    error: 2
+  max_length: 20
   excluded: id
 ```
 
+If your rule is configurable, but does not fit the pattern of
+`ConfigProviderRule`, you can conform directly to `ConfigurableRule`:
+
+* `init(config: AnyObject) throws` will be passed the result of parsing the
+  value from `.swiftlint.yml` associated with your rule's `identifier` as a key
+  (if present).
+* `config` may be of any type supported by YAML (e.g. `Int`, `String`, `Array`,
+  `Dictionary`, etc.).
+* This initializer must throw if it does not understand the configuration, or
+  it cannot be fully initialized with the configuration and default values.
+* By convention, a failing initializer throws
+  `ConfigurationError.UnknownConfiguration`
+* If this initializer fails, your rule will be initialized with its default
+  values by calling `init()`.
+
 ## Tracking changes
 
 All changes should be made via pull requests on GitHub.

README.md

@@ -139,8 +139,9 @@ disabled_rules: # rule identifiers to exclude from running
   - colon
   - comma
   - control_statement
-  - force_cast
-  - ...
+enabled_rules: # some rules are only opt-in
+  - empty_count
+  - missing_docs
   # Find all the available rules by running:
   # swiftlint rules
 included: # paths to include during linting. `--path` is ignored if present.
@@ -150,12 +151,38 @@ excluded: # paths to ignore during linting. Takes precedence over `included`.
   - Pods
   - Source/ExcludedFolder
   - Source/ExcludedFile.swift
-# parameterized rules can be customized from this configuration file
+
+# configurable rules can be customized from this configuration file
+# binary rules can set their severity level
+force_cast: warning # implicitly
+force_try:
+  severity: warning # explicitly
+# rules that have both warning and error levels, can set just the warning level
+# implicitly
 line_length: 110
-# parameterized rules are first parameterized as a warning level, then error level.
+# they can set both implicitly with an array
 type_body_length:
   - 300 # warning
   - 400 # error
+# or they can set both explicitly
+file_length:
+  warning: 500
+  error: 1200
+# naming rules can set warnings/errors for min_length and max_length
+# additionally they can set excluded names
+type_name:
+  min_length: 4 # only warning
+  max_length: # warning and error
+    warning: 40
+    error: 50
+  excluded: iPhone # excluded via string
+variable_name:
+  min_length: # only min_length
+    error: 4 # only error
+  excluded: # excluded via string array
+    - id
+    - URL
+    - GlobalAPIKey
 reporter: "csv" # reporter type (xcode, json, csv, checkstyle)
 ```
 

Source/SwiftLintFramework/Models/Configuration.swift

@@ -128,9 +128,10 @@ public struct Configuration: Equatable {
             let identifier = rule.description.identifier
             if let ConfigurableRuleType = rule as? ConfigurableRule.Type,
                ruleConfig = dict?[identifier] {
-                if let configuredRule = ConfigurableRuleType.init(config: ruleConfig) {
+                do {
+                    let configuredRule = try ConfigurableRuleType.init(config: ruleConfig)
                     rules.append(configuredRule)
-                } else {
+                } catch {
                     queuedPrintError("Invalid config for '\(identifier)'. Falling back to default.")
                     rules.append(rule.init())
                 }

Source/SwiftLintFramework/Models/ConfigurationError.swift

@@ -0,0 +1,13 @@
+//
+//  ConfigurationError.swift
+//  SwiftLint
+//
+//  Created by Scott Hoyt on 1/19/16.
+//  Copyright © 2016 Realm. All rights reserved.
+//
+
+import Foundation
+
+public enum ConfigurationError: ErrorType {
+    case UnknownConfiguration
+}

Source/SwiftLintFramework/Models/MasterRuleList.swift

@@ -46,6 +46,4 @@ public let masterRuleList = RuleList( rules: ClosingBraceRule.self,
                                       TypeBodyLengthRule.self,
                                       TypeNameRule.self,
                                       ValidDocsRule.self,
-                                      VariableNameMaxLengthRule.self,
-                                      VariableNameMinLengthRule.self,
                                       VariableNameRule.self)

Source/SwiftLintFramework/Protocols/Rule.swift

@@ -28,45 +28,30 @@ extension Rule {
 }
 
 public protocol ConfigurableRule: Rule {
-    init?(config: AnyObject)
+    init(config: AnyObject) throws
     func isEqualTo(rule: ConfigurableRule) -> Bool
 }
 
-public protocol ViolationLevelRule: ConfigurableRule {
-    var warning: RuleParameter<Int> { get set }
-    var error: RuleParameter<Int> { get set }
+public protocol ConfigProviderRule: ConfigurableRule {
+    typealias ConfigType: RuleConfig
+    var config: ConfigType { get set }
 }
 
 public protocol CorrectableRule: Rule {
     func correctFile(file: File) -> [Correction]
 }
 
-// MARK: - ViolationLevelRule conformance to ConfigurableRule
+// MARK: - ConfigProviderRule conformance to Configurable
 
-public extension ViolationLevelRule {
-    public init?(config: AnyObject) {
+public extension ConfigProviderRule {
+    public init(config: AnyObject) throws {
         self.init()
-        if let config = [Int].arrayOf(config) where !config.isEmpty {
-            warning = RuleParameter(severity: .Warning, value: config[0])
-            if config.count > 1 {
-                error = RuleParameter(severity: .Error, value: config[1])
-            }
-        } else if let config = config as? [String: AnyObject] {
-            if let warningNumber = config["warning"] as? Int {
-                warning = RuleParameter(severity: .Warning, value: warningNumber)
-            }
-            if let errorNumber = config["error"] as? Int {
-                error = RuleParameter(severity: .Error, value: errorNumber)
-            }
-        } else {
-            return nil
-        }
+        try self.config.setConfig(config)
     }
 
     public func isEqualTo(rule: ConfigurableRule) -> Bool {
         if let rule = rule as? Self {
-            return warning == rule.warning &&
-                   error == rule.error
+            return config.isEqualTo(rule.config)
         }
         return false
     }

Source/SwiftLintFramework/Protocols/RuleConfig.swift

@@ -0,0 +1,23 @@
+//
+//  RuleConfig.swift
+//  SwiftLint
+//
+//  Created by Scott Hoyt on 1/19/16.
+//  Copyright © 2016 Realm. All rights reserved.
+//
+
+import Foundation
+
+public protocol RuleConfig {
+    mutating func setConfig(config: AnyObject) throws
+    func isEqualTo(ruleConfig: RuleConfig) -> Bool
+}
+
+extension RuleConfig where Self: Equatable {
+    public func isEqualTo(ruleConfig: RuleConfig) -> Bool {
+        if let ruleConfig = ruleConfig as? Self {
+            return self == ruleConfig
+        }
+        return false
+    }
+}

Source/SwiftLintFramework/Rules/ClosingBraceRule.swift

@@ -20,7 +20,9 @@ extension File {
     }
 }
 
-public struct ClosingBraceRule: CorrectableRule {
+public struct ClosingBraceRule: CorrectableRule, ConfigProviderRule {
+
+    public var config = SeverityConfig(.Warning)
 
     public init() {}
 
@@ -43,7 +45,8 @@ public struct ClosingBraceRule: CorrectableRule {
     public func validateFile(file: File) -> [StyleViolation] {
         return file.violatingClosingBraceRanges().map {
             StyleViolation(ruleDescription: self.dynamicType.description,
-                location: Location(file: file, characterOffset: $0.location))
+                           severity: config.severity,
+                           location: Location(file: file, characterOffset: $0.location))
         }
     }
 

Source/SwiftLintFramework/Rules/ColonRule.swift

@@ -9,7 +9,9 @@
 import Foundation
 import SourceKittenFramework
 
-public struct ColonRule: CorrectableRule {
+public struct ColonRule: CorrectableRule, ConfigProviderRule {
+
+    public var config = SeverityConfig(.Warning)
 
     public init() {}
 
@@ -85,7 +87,8 @@ public struct ColonRule: CorrectableRule {
 
         return violationRangesInFile(file, withPattern: pattern).flatMap { range in
             return StyleViolation(ruleDescription: self.dynamicType.description,
-                location: Location(file: file, characterOffset: range.location))
+                                  severity: config.severity,
+                                  location: Location(file: file, characterOffset: range.location))
         }
     }
 

Source/SwiftLintFramework/Rules/CommaRule.swift

@@ -9,7 +9,9 @@
 import Foundation
 import SourceKittenFramework
 
-public struct CommaRule: CorrectableRule {
+public struct CommaRule: CorrectableRule, ConfigProviderRule {
+
+    public var config = SeverityConfig(.Warning)
 
     public init() {}
 
@@ -41,7 +43,8 @@ public struct CommaRule: CorrectableRule {
 
         return file.matchPattern(pattern, excludingSyntaxKinds: excludingKinds).map {
             StyleViolation(ruleDescription: self.dynamicType.description,
-                location: Location(file: file, characterOffset: $0.location))
+                           severity: config.severity,
+                           location: Location(file: file, characterOffset: $0.location))
         }
     }
 

Source/SwiftLintFramework/Rules/ConditionalBindingCascadeRule.swift

@@ -9,7 +9,9 @@
 import Foundation
 import SourceKittenFramework
 
-public struct ConditionalBindingCascadeRule: Rule {
+public struct ConditionalBindingCascadeRule: ConfigProviderRule {
+
+    public var config = SeverityConfig(.Warning)
 
     public init() {}
 
@@ -43,7 +45,8 @@ public struct ConditionalBindingCascadeRule: Rule {
                 !(file.contents as NSString).substringWithRange($0).containsString("where")
             }.map {
                 StyleViolation(ruleDescription: self.dynamicType.description,
-                    location: Location(file: file, characterOffset: $0.location))
+                               severity: config.severity,
+                               location: Location(file: file, characterOffset: $0.location))
         }
     }
 }

Source/SwiftLintFramework/Rules/ControlStatementRule.swift

@@ -8,7 +8,9 @@
 
 import SourceKittenFramework
 
-public struct ControlStatementRule: Rule {
+public struct ControlStatementRule: ConfigProviderRule {
+
+    public var config = SeverityConfig(.Warning)
 
     public init() {}
 
@@ -65,6 +67,7 @@ public struct ControlStatementRule: Rule {
                     return nil
                 }
                 return StyleViolation(ruleDescription: self.dynamicType.description,
+                    severity: self.config.severity,
                     location: Location(file: file, characterOffset: match.location))
             }
         }