Chenyu Huang
38 lines
823 B
TypeScript
38 lines
823 B
TypeScript
interface FoundMention {
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value: string
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index: number
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}
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export function getMentionAt(
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text: string,
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cursorPos: number,
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): FoundMention | undefined {
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let re = /(^|\s)@([a-z0-9.-]*)/gi
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let match
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while ((match = re.exec(text))) {
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const spaceOffset = match[1].length
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const index = match.index + spaceOffset
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if (
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cursorPos >= index &&
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cursorPos <= index + match[0].length - spaceOffset
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) {
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return {value: match[2], index}
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}
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}
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return undefined
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}
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export function insertMentionAt(
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text: string,
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cursorPos: number,
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mention: string,
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) {
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const target = getMentionAt(text, cursorPos)
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if (target) {
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return `${text.slice(0, target.index)}@${mention} ${text.slice(
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target.index + target.value.length + 1, // add 1 to include the "@"
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)}`
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}
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return text
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}
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