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import Foundation
import XCTest
final class ViewDerivedDataTests: XCTestCase {
func testGenericListViewDerivedCollectionsAreReferencedOncePerRenderPass() throws {
let source = try loadSource(at: "Sora/Views/Generic/GenericListView.swift")
let normalizedSource = strippingCommentsAndStrings(from: source)
let filteredItemsUsages = referenceCount(
for: "filteredItems",
in: normalizedSource
)
let sortedFilteredItemsUsages = referenceCount(
for: "sortedFilteredItems",
in: normalizedSource
)
// swiftlint:disable:next prefer_nimble
XCTAssertLessThanOrEqual(
filteredItemsUsages,
1,
"filteredItems should be consumed once per dependency change."
)
// swiftlint:disable:next prefer_nimble
XCTAssertLessThanOrEqual(
sortedFilteredItemsUsages,
1,
"sortedFilteredItems should be consumed once per dependency change."
)
}
func testPostGridViewDerivedCollectionsAreReferencedOncePerRenderPass() throws {
let source = try loadSource(at: "Sora/Views/Post/Grid/PostGridView.swift")
let normalizedSource = strippingCommentsAndStrings(from: source)
let activePostsUsages = referenceCount(
for: "activePosts",
in: normalizedSource
)
let getColumnsDataUsages = invocationCount(
forFunction: "getColumnsData",
in: normalizedSource
)
// swiftlint:disable:next prefer_nimble
XCTAssertLessThanOrEqual(
activePostsUsages,
1,
"activePosts-derived data should be consumed once per dependency change."
)
// swiftlint:disable:next prefer_nimble
XCTAssertLessThanOrEqual(
getColumnsDataUsages,
1,
"getColumnsData should be invoked once per dependency change."
)
}
private func loadSource(at relativePath: String) throws -> String {
let currentFile = URL(fileURLWithPath: #filePath)
let repositoryRoot = currentFile.deletingLastPathComponent().deletingLastPathComponent()
let fileURL = repositoryRoot.appendingPathComponent(relativePath)
return try String(contentsOf: fileURL, encoding: .utf8)
}
// swiftlint:disable:next cyclomatic_complexity
private func strippingCommentsAndStrings(from source: String) -> String {
let characters = Array(source)
var result: [Character] = []
result.reserveCapacity(characters.count)
var currentOffset = 0
var inLineComment = false
var blockCommentDepth = 0
var inString = false
var isEscaped = false
while currentOffset < characters.count {
let current = characters[currentOffset]
let next: Character? = currentOffset + 1 < characters.count ? characters[currentOffset + 1] : nil
if inLineComment {
if current == "\n" {
inLineComment = false
result.append("\n")
} else {
result.append(" ")
}
currentOffset += 1
continue
}
if blockCommentDepth > 0 {
if current == "/", next == "*" {
blockCommentDepth += 1
result.append(" ")
result.append(" ")
currentOffset += 2
continue
}
if current == "*", next == "/" {
blockCommentDepth -= 1
result.append(" ")
result.append(" ")
currentOffset += 2
continue
}
result.append(current == "\n" ? "\n" : " ")
currentOffset += 1
continue
}
if inString {
if isEscaped {
isEscaped = false
} else if current == "\\" {
isEscaped = true
} else if current == "\"" {
inString = false
}
result.append(current == "\n" ? "\n" : " ")
currentOffset += 1
continue
}
if current == "/", next == "/" {
inLineComment = true
result.append(" ")
result.append(" ")
currentOffset += 2
continue
}
if current == "/", next == "*" {
blockCommentDepth = 1
result.append(" ")
result.append(" ")
currentOffset += 2
continue
}
if current == "\"" {
inString = true
result.append(" ")
currentOffset += 1
continue
}
result.append(current)
currentOffset += 1
}
return String(result)
}
private func referenceCount(for symbol: String, in source: String) -> Int {
let totalMatches = tokenCount(
matching: #"\b\#(symbol)\b"#,
in: source
)
let declarationMatches = tokenCount(
matching: #"\b(?:var|let)\s+\#(symbol)\b"#,
in: source
)
return max(0, totalMatches - declarationMatches)
}
private func invocationCount(forFunction name: String, in source: String) -> Int {
let totalMatches = tokenCount(
matching: #"\b\#(name)\s*\("#,
in: source
)
let declarationMatches = tokenCount(
matching: #"\bfunc\s+\#(name)\s*\("#,
in: source
)
return max(0, totalMatches - declarationMatches)
}
private func tokenCount(matching pattern: String, in source: String) -> Int {
guard let regex = try? NSRegularExpression(pattern: pattern) else { return 0 }
let range = NSRange(source.startIndex..<source.endIndex, in: source)
return regex.numberOfMatches(in: source, range: range)
}
}
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