25 lines
907 B
JavaScript
25 lines
907 B
JavaScript
/**
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* Resolve attribute value from code block info string
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*
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* 从代码块信息字符串中解析属性值
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*
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* @param info - Code block info string / 代码块信息字符串
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* @param attr - Attribute name to resolve / 要解析的属性名
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* @returns The attribute value or null if not found / 属性值，如果未找到则返回 null
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*
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* @example
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* ```ts
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* resolveAttr('js title="example.js"', 'title') // 'example.js'
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* resolveAttr('js title=\'example.js\'', 'title') // 'example.js'
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* resolveAttr('js', 'title') // null
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* ```
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*/
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export const resolveAttr = (info, attr) => {
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// try to match specified attr mark
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const pattern = `\\b${attr}\\s*=\\s*(?<quote>['"])(?<content>.+?)\\k<quote>(\\s|$)`;
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const regex = new RegExp(pattern, 'i');
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const match = info.match(regex);
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// return content if matched, null if not specified
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return match?.groups?.content ?? null;
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};
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