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Merge pull request #2679 from realm/marcelo/first-index
`contains_over_first_not_nil` rule now also checks for `firstIndex(where:)`
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46 changes: 27 additions & 19 deletions
46
Source/SwiftLintFramework/Rules/Performance/ContainsOverFirstNotNilRule.swift
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,34 +1,42 @@ | ||
| import SourceKittenFramework | ||
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| public struct ContainsOverFirstNotNilRule: CallPairRule, OptInRule, ConfigurationProviderRule, AutomaticTestableRule { | ||
| public struct ContainsOverFirstNotNilRule: CallPairRule, OptInRule, ConfigurationProviderRule { | ||
| public var configuration = SeverityConfiguration(.warning) | ||
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| public init() {} | ||
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| public static let description = RuleDescription( | ||
| identifier: "contains_over_first_not_nil", | ||
| name: "Contains over first not nil", | ||
| description: "Prefer `contains` over `first(where:) != nil`", | ||
| description: "Prefer `contains` over `first(where:) != nil` and `firstIndex(where:) != nil`.", | ||
| kind: .performance, | ||
| nonTriggeringExamples: [ | ||
| "let first = myList.first(where: { $0 % 2 == 0 })\n", | ||
| "let first = myList.first { $0 % 2 == 0 }\n" | ||
| ], | ||
| triggeringExamples: [ | ||
| "↓myList.first { $0 % 2 == 0 } != nil\n", | ||
| "↓myList.first(where: { $0 % 2 == 0 }) != nil\n", | ||
| "↓myList.map { $0 + 1 }.first(where: { $0 % 2 == 0 }) != nil\n", | ||
| "↓myList.first(where: someFunction) != nil\n", | ||
| "↓myList.map { $0 + 1 }.first { $0 % 2 == 0 } != nil\n", | ||
| "(↓myList.first { $0 % 2 == 0 }) != nil\n" | ||
| ] | ||
| nonTriggeringExamples: ["first", "firstIndex"].flatMap { method in | ||
| return [ | ||
| "let \(method) = myList.\(method)(where: { $0 % 2 == 0 })\n", | ||
| "let \(method) = myList.\(method) { $0 % 2 == 0 }\n" | ||
| ] | ||
| }, | ||
| triggeringExamples: ["first", "firstIndex"].flatMap { method in | ||
| return [ | ||
| "↓myList.\(method) { $0 % 2 == 0 } != nil\n", | ||
| "↓myList.\(method)(where: { $0 % 2 == 0 }) != nil\n", | ||
| "↓myList.map { $0 + 1 }.\(method)(where: { $0 % 2 == 0 }) != nil\n", | ||
| "↓myList.\(method)(where: someFunction) != nil\n", | ||
| "↓myList.map { $0 + 1 }.\(method) { $0 % 2 == 0 } != nil\n", | ||
| "(↓myList.\(method) { $0 % 2 == 0 }) != nil\n" | ||
| ] | ||
| } | ||
| ) | ||
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| public func validate(file: File) -> [StyleViolation] { | ||
| return validate(file: file, | ||
| pattern: "[\\}\\)]\\s*!=\\s*nil", | ||
| patternSyntaxKinds: [.keyword], | ||
| callNameSuffix: ".first", | ||
| severity: configuration.severity) | ||
| let pattern = "[\\}\\)]\\s*!=\\s*nil" | ||
| let firstViolations = validate(file: file, pattern: pattern, patternSyntaxKinds: [.keyword], | ||
| callNameSuffix: ".first", severity: configuration.severity, | ||
| reason: "Prefer `contains` over `first(where:) != nil`") | ||
| let firstIndexViolations = validate(file: file, pattern: pattern, patternSyntaxKinds: [.keyword], | ||
| callNameSuffix: ".firstIndex", severity: configuration.severity, | ||
| reason: "Prefer `contains` over `firstIndex(where:) != nil`") | ||
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| return firstViolations + firstIndexViolations | ||
| } | ||
| } |
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36 changes: 36 additions & 0 deletions
36
Tests/SwiftLintFrameworkTests/ContainsOverFirstNotNilRuleTests.swift
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,36 @@ | ||
| import SwiftLintFramework | ||
| import XCTest | ||
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| class ContainsOverFirstNotNilRuleTests: XCTestCase { | ||
| func testWithDefaultConfiguration() { | ||
| verifyRule(ContainsOverFirstNotNilRule.description) | ||
| } | ||
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| // MARK: - Reasons | ||
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| func testFirstReason() { | ||
| let string = "↓myList.first { $0 % 2 == 0 } != nil" | ||
| let violations = self.violations(string) | ||
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| XCTAssertEqual(violations.count, 1) | ||
| XCTAssertEqual(violations.first?.reason, "Prefer `contains` over `first(where:) != nil`") | ||
| } | ||
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| func testFirstIndexReason() { | ||
| let string = "↓myList.firstIndex { $0 % 2 == 0 } != nil" | ||
| let violations = self.violations(string) | ||
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| XCTAssertEqual(violations.count, 1) | ||
| XCTAssertEqual(violations.first?.reason, "Prefer `contains` over `firstIndex(where:) != nil`") | ||
| } | ||
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| // MARK: - Private | ||
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| private func violations(_ string: String, config: Any? = nil) -> [StyleViolation] { | ||
| guard let config = makeConfig(config, ContainsOverFirstNotNilRule.description.identifier) else { | ||
| return [] | ||
| } | ||
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| return SwiftLintFrameworkTests.violations(string, config: config) | ||
| } | ||
| } |