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Fix crash in formatMessageAsText: use NSString length for NSRanges and guard slicing before matches to avoid invalid ranges with multi-byte content

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This commit is contained in:
jack
2025-08-28 09:18:11 +01:00
parent cf1bfdac6b
commit 11cd5527ed
1 changed files with 20 additions and 14 deletions
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bitchat/ViewModels/ChatViewModel.swift
+20 -14
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@@ -3161,9 +3161,12 @@ class ChatViewModel: ObservableObject, BitchatDelegate {
// For extremely long content, render as plain text to avoid heavy regex/layout work,
// unless the content includes Cashu tokens we want to chip-render below
// Compute NSString-backed length for regex/nsrange correctness with multi-byte characters
let nsContent = content as NSString
let nsLen = nsContent.length
let containsCashuEarly: Bool = {
let rx = Regexes.quickCashuPresence
return rx.numberOfMatches(in: content, options: [], range: NSRange(location: 0, length: content.count)) > 0
return rx.numberOfMatches(in: content, options: [], range: NSRange(location: 0, length: nsLen)) > 0
}()
if (content.count > 4000 || content.hasVeryLongToken(threshold: 1024)) && !containsCashuEarly {
var plainStyle = AttributeContainer()
@@ -3181,8 +3184,6 @@ class ChatViewModel: ObservableObject, BitchatDelegate {
let lnurlRegex = Regexes.lnurl
let lightningSchemeRegex = Regexes.lightningScheme
let detector = Regexes.linkDetector
let nsLen = content.count
let hasMentionsHint = content.contains("@")
let hasHashtagsHint = content.contains("#")
let hasURLHint = content.contains("://") || content.contains("www.") || content.contains("http")
@@ -3262,17 +3263,19 @@ class ChatViewModel: ObservableObject, BitchatDelegate {
for (range, type) in allMatches {
// Add text before match
if let nsRange = Range(range, in: content) {
let beforeText = String(content[lastEnd..<nsRange.lowerBound])
if !beforeText.isEmpty {
var beforeStyle = AttributeContainer()
beforeStyle.foregroundColor = baseColor
beforeStyle.font = isSelf
? .system(size: 14, weight: .bold, design: .monospaced)
: .system(size: 14, design: .monospaced)
if isMentioned {
beforeStyle.font = beforeStyle.font?.bold()
if lastEnd < nsRange.lowerBound {
let beforeText = String(content[lastEnd..<nsRange.lowerBound])
if !beforeText.isEmpty {
var beforeStyle = AttributeContainer()
beforeStyle.foregroundColor = baseColor
beforeStyle.font = isSelf
? .system(size: 14, weight: .bold, design: .monospaced)
: .system(size: 14, design: .monospaced)
if isMentioned {
beforeStyle.font = beforeStyle.font?.bold()
}
result.append(AttributedString(beforeText).mergingAttributes(beforeStyle))
}
result.append(AttributedString(beforeText).mergingAttributes(beforeStyle))
}
// Add styled match
@@ -3380,7 +3383,10 @@ class ChatViewModel: ObservableObject, BitchatDelegate {
result.append(AttributedString(matchText).mergingAttributes(matchStyle))
}
}
lastEnd = nsRange.upperBound
// Advance lastEnd safely in case of overlaps
if lastEnd < nsRange.upperBound {
lastEnd = nsRange.upperBound
}
}
}