50 lines
1.6 KiB
TypeScript
50 lines
1.6 KiB
TypeScript
/**
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* Shared mention trigger detection.
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*
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* Detects when the user has typed "@" followed by an optional query
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* at the cursor position, and returns the match info for opening
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* a mention panel.
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*/
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/** Characters that BLOCK @ trigger (only @ itself, to prevent @@). */
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const BLOCKED_BEFORE_AT = /[@]/;
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export interface MentionTriggerMatch {
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/** Index of the @ character in the full text. */
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atIndex: number;
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/** The query text after @ (may be empty). */
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query: string;
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}
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/**
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* Check whether the text before the cursor contains an active @ mention trigger.
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*
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* Rules:
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* - @ must be at position 0, or preceded by a boundary character
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* (whitespace, Chinese/English punctuation, brackets).
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* - The query (text after @ up to the cursor) must not contain
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* any boundary character or space.
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* - Returns null if no trigger is found.
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*/
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export function detectMentionTrigger(textBeforeCursor: string): MentionTriggerMatch | null {
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const atIdx = textBeforeCursor.lastIndexOf("@");
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if (atIdx < 0) return null;
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// @ must be at start or not preceded by another @
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if (atIdx > 0 && BLOCKED_BEFORE_AT.test(textBeforeCursor[atIdx - 1])) {
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return null;
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}
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const query = textBeforeCursor.slice(atIdx + 1);
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// Query must not contain spaces or punctuation that would break a mention token
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if (/[\s，。、；：！？?!.,;:(){}[\]<>""''《》【】@]/.test(query)) {
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return null;
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}
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return { atIndex: atIdx, query };
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}
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/** Token pattern for @图片1, @视频1, @文本1, @音频1, @附件1, @素材1, etc. */
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export const MENTION_TOKEN_RE = /@(?:图片|视频|文本|音频|附件|素材)\d+/g;
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