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Adds closure_body_length opt-in rule
because closure bodies should not span too many lines. Implements realm#52.
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61 changes: 61 additions & 0 deletions
61
Source/SwiftLintFramework/Rules/ClosureBodyLengthRule.swift
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,61 @@ | ||
| // | ||
| // ClosureBodyLengthRule.swift | ||
| // SwiftLint | ||
| // | ||
| // Created by Ornithologist Coder on 8/3/17. | ||
| // Copyright © 2017 Realm. All rights reserved. | ||
| // | ||
|
|
||
| import Foundation | ||
| import SourceKittenFramework | ||
|
|
||
| public struct ClosureBodyLengthRule: ASTRule, OptInRule, ConfigurationProviderRule { | ||
| public var configuration = SeverityLevelsConfiguration(warning: 20, error: 100) | ||
|
|
||
| public init() {} | ||
|
|
||
| public static let description = RuleDescription( | ||
| identifier: "closure_body_length", | ||
| name: "Closure Body Length", | ||
| description: "Closure bodies should not span too many lines.", | ||
| kind: .metrics, | ||
| nonTriggeringExamples: [ | ||
| "foo.bar { $0 }", | ||
| "foo.bar { value in\n" + repeatElement("\tprint(\"toto\")\n", count: 19).joined() + "\treturn value\n}", | ||
| "foo.bar { value in\n\n" + repeatElement("\tprint(\"toto\")\n", count: 19).joined() + "\n\treturn value\n}" | ||
| ], | ||
| triggeringExamples: [ | ||
| "foo.bar {↓ value in\n" + repeatElement("\tprint(\"toto\")\n", count: 20).joined() + "\treturn value\n}", | ||
| "foo.bar {↓ value in\n\n" + repeatElement("\tprint(\"toto\")\n", count: 20).joined() + "\n\treturn value\n}" | ||
| ] | ||
| ) | ||
|
|
||
| public func validate(file: File, | ||
| kind: SwiftExpressionKind, | ||
| dictionary: [String: SourceKitRepresentable]) -> [StyleViolation] { | ||
| guard | ||
| kind == .call, | ||
| let bodyOffset = dictionary.bodyOffset, | ||
| let bodyLength = dictionary.bodyLength, | ||
| case let contents = file.contents.bridge(), | ||
| contents.substringWithByteRange(start: bodyOffset - 1, length: 1) == "{", | ||
| let startLine = contents.lineAndCharacter(forByteOffset: bodyOffset)?.line, | ||
| let endLine = contents.lineAndCharacter(forByteOffset: bodyOffset + bodyLength)?.line | ||
| else { | ||
| return [] | ||
| } | ||
|
|
||
| return configuration.params.flatMap { parameter in | ||
| let (exceeds, lineCount) = file.exceedsLineCountExcludingCommentsAndWhitespace(startLine, | ||
| endLine, | ||
| parameter.value) | ||
| guard exceeds else { return nil } | ||
|
|
||
| return StyleViolation(ruleDescription: type(of: self).description, | ||
| severity: parameter.severity, | ||
| location: Location(file: file, byteOffset: bodyOffset), | ||
| reason: "Closure body should span \(configuration.warning) lines or less " + | ||
| "excluding comments and whitespace: currently spans \(lineCount) " + "lines") | ||
| } | ||
| } | ||
| } |
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