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import Markdown
enum ChatMarkdownPreprocessor {
/// Provenance marker appended to every OpenClaw-injected inbound context header.
/// Keep byte-identical with `src/auto-reply/reply/inbound-context-marker.ts` INBOUND_CONTEXT_MARKER.
private static let inboundContextMarker = "\u{27E6}openclaw:ctx\u{27E7}"
private static let contextHeader =
"Context: \(inboundContextMarker)"
private static let envelopeChannels = [
"WebChat",
"WhatsApp",
"Telegram",
"Signal",
"Slack",
"Discord",
"Google Chat",
"iMessage",
"Teams",
"Matrix",
"Zalo",
"Zalo Personal",
]
private static let messageIdHintPattern = #"^\s*\[message_id:\s*[^\]]+\]\s*$"#
private static let markdownLiteralPunctuation = CharacterSet(
charactersIn: "!\"#$%&'()*+,-./:;<=>?@[\\]^_`{|}~")
private struct MarkdownImageOccurrence {
let range: Range<String.Index>
let label: String
let source: String
}
/// Maps swift-markdown's 1-based UTF-8 source locations back into the
/// original String without normalizing line endings or Unicode first.
private struct MarkdownSourceMap {
private let markdown: String
private let lineStarts: [String.Index]
init(_ markdown: String) {
self.markdown = markdown
var lineStarts = [markdown.startIndex]
let bytes = markdown.utf8
for byteIndex in bytes.indices {
let byte = bytes[byteIndex]
guard byte == 0x0A || byte == 0x0D else { continue }
let nextByteIndex = bytes.index(after: byteIndex)
// CommonMark counts CRLF as one line ending. Record the next
// line at LF, not at the midpoint of the two-byte sequence.
if byte == 0x0D,
nextByteIndex < bytes.endIndex,
bytes[nextByteIndex] == 0x0A
{
continue
}
if let lineStart = String.Index(nextByteIndex, within: markdown) {
lineStarts.append(lineStart)
}
}
self.lineStarts = lineStarts
}
func range(for sourceRange: SourceRange) -> Range<String.Index>? {
guard let lowerBound = self.index(for: sourceRange.lowerBound),
let upperBound = self.index(for: sourceRange.upperBound),
lowerBound <= upperBound
else {
return nil
}
return lowerBound..<upperBound
}
private func index(for location: SourceLocation) -> String.Index? {
guard location.line > 0,
location.column > 0,
self.lineStarts.indices.contains(location.line - 1)
else {
return nil
}
let bytes = self.markdown.utf8
guard let lineStart = self.lineStarts[location.line - 1].samePosition(in: bytes),
let byteIndex = bytes.index(
lineStart,
offsetBy: location.column - 1,
limitedBy: bytes.endIndex),
let stringIndex = String.Index(byteIndex, within: self.markdown)
else {
return nil
}
// A malformed dependency range must not spill into the next line.
if self.lineStarts.indices.contains(location.line),
stringIndex >= self.lineStarts[location.line]
{
return nil
}
return stringIndex
}
}
private struct MarkdownImageCollector: MarkupWalker {
private let sourceMap: MarkdownSourceMap
private(set) var images: [MarkdownImageOccurrence] = []
init(markdown: String) {
self.sourceMap = MarkdownSourceMap(markdown)
}
mutating func visitImage(_ image: Markdown.Image) {
guard let sourceRange = image.range,
let range = self.sourceMap.range(for: sourceRange)
else {
return
}
self.images.append(MarkdownImageOccurrence(
range: range,
label: image.plainText,
source: image.source ?? ""))
}
}
struct InlineImage: Identifiable {
let id = UUID()
let label: String
let image: OpenClawPlatformImage?
}
struct Result {
let cleaned: String
let images: [InlineImage]
}
static func preprocess(markdown raw: String) -> Result {
let withoutEnvelope = self.stripEnvelope(raw)
let withoutMessageIdHints = self.stripMessageIdHints(withoutEnvelope)
let withoutContextBlocks = self.stripInboundContextBlocks(withoutMessageIdHints)
let withoutTimestamps = self.stripPrefixedTimestamps(withoutContextBlocks)
// cmark replaces NUL with U+FFFD before computing UTF-8 source columns.
// Use those same bytes for range mapping and the downstream renderer.
let markdown = withoutTimestamps.replacingOccurrences(of: "\0", with: "\u{FFFD}")
guard markdown.contains("![") else {
return Result(cleaned: self.normalize(markdown), images: [])
}
// Only structural CommonMark images are renderable. A document-wide
// regex also matches examples inside code and escaped user text.
var collector = MarkdownImageCollector(markdown: markdown)
collector.visit(Document(parsing: markdown))
guard !collector.images.isEmpty else {
return Result(cleaned: self.normalize(markdown), images: [])
}
var images: [InlineImage] = []
let cleaned = NSMutableString(string: markdown)
for occurrence in collector.images.reversed() {
let range = NSRange(occurrence.range, in: markdown)
if let inlineImage = self.inlineImage(
label: occurrence.label,
source: occurrence.source)
{
images.append(inlineImage)
cleaned.replaceCharacters(in: range, with: "")
} else {
cleaned.replaceCharacters(
in: range,
with: self.fallbackImageLabel(occurrence.label))
}
}
return Result(cleaned: self.normalize(cleaned as String), images: images.reversed())
}
private static func inlineImage(label: String, source: String) -> InlineImage? {
let trimmed = source.trimmingCharacters(in: .whitespacesAndNewlines)
guard let comma = trimmed.firstIndex(of: ","),
trimmed[..<comma].range(
of: #"^data:image\/[^;]+;base64$"#,
options: [.regularExpression, .caseInsensitive]) != nil
else {
return nil
}
let b64 = String(trimmed[trimmed.index(after: comma)...])
let image = Data(base64Encoded: b64).flatMap(OpenClawPlatformImage.init(data:))
return InlineImage(label: label, image: image)
}
private static func fallbackImageLabel(_ label: String) -> String {
let trimmed = label.trimmingCharacters(in: .whitespacesAndNewlines)
return self.markdownEscapedLiteral(trimmed.isEmpty ? "image" : trimmed)
}
private static func markdownEscapedLiteral(_ value: String) -> String {
var escaped = ""
escaped.reserveCapacity(value.utf8.count)
for scalar in value.unicodeScalars {
if self.markdownLiteralPunctuation.contains(scalar) {
escaped.append("\\")
}
escaped.unicodeScalars.append(scalar)
}
return escaped
}
private static func stripEnvelope(_ raw: String) -> String {
guard let closeIndex = raw.firstIndex(of: "]"),
raw.first == "["
else {
return raw
}
let header = String(raw[raw.index(after: raw.startIndex)..<closeIndex])
guard self.looksLikeEnvelopeHeader(header) else {
return raw
}
return String(raw[raw.index(after: closeIndex)...])
}
private static func looksLikeEnvelopeHeader(_ header: String) -> Bool {
if header.range(of: #"\d{4}-\d{2}-\d{2}T\d{2}:\d{2}Z\b"#, options: .regularExpression) != nil {
return true
}
if header.range(of: #"\d{4}-\d{2}-\d{2} \d{2}:\d{2}\b"#, options: .regularExpression) != nil {
return true
}
return self.envelopeChannels.contains(where: { header.hasPrefix("\($0) ") })
}
private static func stripMessageIdHints(_ raw: String) -> String {
guard raw.contains("[message_id:") else {
return raw
}
let lines = raw.replacingOccurrences(of: "\r\n", with: "\n").split(
separator: "\n",
omittingEmptySubsequences: false)
let filtered = lines.filter { line in
String(line).range(of: self.messageIdHintPattern, options: .regularExpression) == nil
}
guard filtered.count != lines.count else {
return raw
}
return filtered.map(String.init).joined(separator: "\n")
}
private static func stripInboundContextBlocks(_ raw: String) -> String {
guard raw.contains(self.inboundContextMarker) else {
return raw
}
let normalized = raw.replacingOccurrences(of: "\r\n", with: "\n")
let lines = normalized.split(separator: "\n", omittingEmptySubsequences: false).map(String.init)
var outputLines: [String] = []
var inMetaBlock = false
var inFencedJson = false
var inProseBlock = false
for index in lines.indices {
let currentLine = lines[index]
// Prose context body (chat history/window): drop lines until the
// block-terminating blank line so the visible marker never renders.
if inProseBlock {
if currentLine.trimmingCharacters(in: .whitespacesAndNewlines).isEmpty {
inProseBlock = false
}
continue
}
if !inMetaBlock, self.shouldStripTrailingUntrustedContext(lines: lines, index: index) {
break
}
if !inMetaBlock {
let trimmed = currentLine.trimmingCharacters(in: .whitespacesAndNewlines)
let isContextHeader = trimmed.count > self.inboundContextMarker.count &&
trimmed.hasSuffix(self.inboundContextMarker)
if isContextHeader {
let nextLine = index + 1 < lines.count ? lines[index + 1] : nil
if nextLine?.trimmingCharacters(in: .whitespacesAndNewlines) != "```json" {
inProseBlock = true
continue
}
inMetaBlock = true
inFencedJson = false
continue
}
}
if inMetaBlock {
if !inFencedJson, currentLine.trimmingCharacters(in: .whitespacesAndNewlines) == "```json" {
inFencedJson = true
continue
}
if inFencedJson {
if currentLine.trimmingCharacters(in: .whitespacesAndNewlines) == "```" {
inMetaBlock = false
inFencedJson = false
}
continue
}
if currentLine.trimmingCharacters(in: .whitespacesAndNewlines).isEmpty {
continue
}
inMetaBlock = false
}
outputLines.append(currentLine)
}
return outputLines
.joined(separator: "\n")
.replacingOccurrences(of: #"^\n+"#, with: "", options: .regularExpression)
}
private static func shouldStripTrailingUntrustedContext(lines: [String], index: Int) -> Bool {
lines[index].trimmingCharacters(in: .whitespacesAndNewlines) == self.contextHeader
}
private static func stripPrefixedTimestamps(_ raw: String) -> String {
let pattern = #"(?m)^\[[A-Za-z]{3}\s+\d{4}-\d{2}-\d{2}\s+\d{2}:\d{2}(?::\d{2})?\s+(?:GMT|UTC)[+-]?\d{0,2}\]\s*"#
return raw.replacingOccurrences(of: pattern, with: "", options: .regularExpression)
}
private static func normalize(_ raw: String) -> String {
var output = raw
output = output.replacingOccurrences(of: "\r\n", with: "\n")
output = output.replacingOccurrences(of: "\n\n\n", with: "\n\n")
output = output.replacingOccurrences(of: "\n\n\n", with: "\n\n")
return output.trimmingCharacters(in: .whitespacesAndNewlines)
}
}
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