Puranjay Savar Mattas
6e1ffb96fd
Convert from git submodule to plain vendored copy. No push access to upstream nodes-app/swift-markdown-engine meant our local fix commit (05c1720) was stranded and unreachable from any remote on fresh clones/CI. Vendoring as plain files folds it into normal repo history instead.
145 lines
6.3 KiB
Swift
145 lines
6.3 KiB
Swift
//
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// WikiLinkIncrementalTests.swift
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// MarkdownEngine
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//
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// Created by Luca Chen on 07.07.26.
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//
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import Foundation
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import Testing
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@testable import MarkdownEngine
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@Suite("WikiLink incremental storage state")
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struct WikiLinkIncrementalTests {
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/// storage: "Hello [[Note|abc123]] world" → display: "Hello [[Note]] world"
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/// display link range {6, 8}, storage link range {6, 15}.
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private func seed() -> (display: String, storage: String,
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meta: [WikiLinkService.RangeKey: WikiLinkService.LinkMetadata]) {
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let storage = "Hello [[Note|abc123]] world"
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let state = WikiLinkService.makeDisplayState(from: storage)
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return (state.display, storage, state.metadata)
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}
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@Test func appendAfterLinkSplicesStorage() throws {
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let (display, storage, meta) = seed()
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let newDisplay = display + "x" // typed "x" at the end
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let result = try #require(WikiLinkService.updatedStorageState(
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displayText: newDisplay,
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editedRange: NSRange(location: (display as NSString).length, length: 1),
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changeInLength: 1,
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previousStorage: storage,
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previousMetadata: meta
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))
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#expect(result.storage == "Hello [[Note|abc123]] worldx")
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// Link before the edit: metadata unchanged.
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let key = try #require(result.metadata.keys.first)
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#expect(key.location == 6 && key.length == 8)
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#expect(result.metadata[key]?.id == "abc123")
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#expect(result.metadata[key]?.storageRange == NSRange(location: 6, length: 15))
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}
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@Test func insertBeforeLinkShiftsMetadata() throws {
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let (display, storage, meta) = seed()
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let newDisplay = "x" + display // typed "x" at position 0
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let result = try #require(WikiLinkService.updatedStorageState(
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displayText: newDisplay,
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editedRange: NSRange(location: 0, length: 1),
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changeInLength: 1,
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previousStorage: storage,
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previousMetadata: meta
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))
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#expect(result.storage == "xHello [[Note|abc123]] world")
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let key = try #require(result.metadata.keys.first)
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#expect(key.location == 7 && key.length == 8) // shifted by +1
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#expect(result.metadata[key]?.storageRange == NSRange(location: 7, length: 15))
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#expect(result.metadata[key]?.id == "abc123")
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}
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@Test func deletionInPlainTextWorks() throws {
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let (display, storage, meta) = seed()
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// Delete the "l" of "world" (display location 18 — far enough from the
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// link that neither the ±3 probe nor the metadata guard band trips).
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let ns = display as NSString
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let newDisplay = ns.replacingCharacters(in: NSRange(location: 18, length: 1), with: "")
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let result = try #require(WikiLinkService.updatedStorageState(
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displayText: newDisplay,
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editedRange: NSRange(location: 18, length: 0),
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changeInLength: -1,
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previousStorage: storage,
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previousMetadata: meta
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))
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#expect(result.storage == "Hello [[Note|abc123]] word")
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}
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@Test func editTouchingLinkFallsBack() {
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let (display, storage, meta) = seed()
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// Typing directly after "]]" (display location 14) is inside the ±3 guard band.
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let result = WikiLinkService.updatedStorageState(
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displayText: display + " ",
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editedRange: NSRange(location: 14, length: 1),
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changeInLength: 1,
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previousStorage: storage,
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previousMetadata: meta
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)
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#expect(result == nil)
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}
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@Test func editCreatingLinkSyntaxFallsBack() {
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// "[[x]" + typed "]" completes a link → the new-text probe sees "]]" → bail.
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let display = "pre [[x] post"
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let ns = display as NSString
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let newDisplay = ns.replacingCharacters(in: NSRange(location: 8, length: 0), with: "]")
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let result = WikiLinkService.updatedStorageState(
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displayText: newDisplay,
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editedRange: NSRange(location: 8, length: 1),
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changeInLength: 1,
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previousStorage: display,
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previousMetadata: [:]
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)
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#expect(result == nil)
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}
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@Test func unknownDeltaFallsBack() {
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let (display, storage, meta) = seed()
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let result = WikiLinkService.updatedStorageState(
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displayText: display,
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editedRange: NSRange(location: 0, length: 0),
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changeInLength: Int.min,
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previousStorage: storage,
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previousMetadata: meta
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)
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#expect(result == nil)
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}
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/// Property sweep: inserting one char at every position that takes the fast
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/// path must yield a storage string that (a) round-trips back to exactly the
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/// new display text and (b) preserves every link id. (Comparing against a
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/// full `makeStorageState(textStorage: nil)` rebuild would be wrong here —
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/// the full rebuild loses ids when link ranges shift, which is precisely
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/// what the incremental path fixes.)
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@Test func spliceRoundTripsAtEverySafePosition() {
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let storage = "aaaa [[One|id1]] bbbb [[Two|id2]] cccc"
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let state = WikiLinkService.makeDisplayState(from: storage)
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let display = state.display as NSString
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var fastPathTaken = 0
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for position in 0...display.length {
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let newDisplay = display.replacingCharacters(in: NSRange(location: position, length: 0), with: "q")
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guard let fast = WikiLinkService.updatedStorageState(
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displayText: newDisplay,
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editedRange: NSRange(location: position, length: 1),
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changeInLength: 1,
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previousStorage: storage,
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previousMetadata: state.metadata
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) else { continue } // guarded position → fallback, fine
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fastPathTaken += 1
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let roundTrip = WikiLinkService.makeDisplayState(from: fast.storage)
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#expect(roundTrip.display == newDisplay, "display round-trip diverged at position \(position)")
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#expect(fast.metadata.values.compactMap(\.id).sorted() == ["id1", "id2"],
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"link id lost at position \(position)")
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}
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#expect(fastPathTaken > 0, "sweep was vacuous — no position took the fast path")
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}
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}
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