Function searchInMessages

src/renderer/src/utils/globalSearchUtils.ts:145–224

* 在单个页面的消息中搜索，返回按消息分组的结果

(
  messages: ChatMessage[],
  pattern: RegExp,
  pageId: string,
  options: GlobalSearchOptions
)

 * 在单个页面的消息中搜索，返回按消息分组的结果
 */
function searchInMessages(
  messages: ChatMessage[],
  pattern: RegExp,
  pageId: string,
  options: GlobalSearchOptions
): GlobalSearchMessageGroup[] {
  const messageGroups: GlobalSearchMessageGroup[] = []
  let totalMatchCount = 0

  for (const message of messages) {
    // 角色筛选
    if (options.roleFilter !== 'all' && message.role !== options.roleFilter) {
      continue
    }

    // 时间筛选
    if (!isInTimeRange(message.createdAt, options.timeRange)) {
      continue
    }

    const content = message.content
    if (!content) continue

    // 重置正则表达式的 lastIndex
    pattern.lastIndex = 0

    const matches: GlobalSearchMatch[] = []
    let match: RegExpExecArray | null

    while ((match = pattern.exec(content)) !== null && totalMatchCount < MAX_MATCHES_PER_PAGE) {
      const matchText = match[0]
      const { snippet, matchStart, matchEnd } = extractSnippet(
        content,
        match.index,
        matchText.length
      )

      matches.push({
        messageId: message.id,
        pageId,
        role: message.role,
        snippet,
        matchStart,
        matchEnd,
        contentStart: match.index,
        contentEnd: match.index + matchText.length,
        occurrenceIndexInMessage: countOccurrencesBefore(content, matchText, match.index),
        createdAt: message.createdAt
      })

      totalMatchCount++

      // 防止零长度匹配导致无限循环
      if (match[0].length === 0) {
        pattern.lastIndex++
      }
    }