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        <h1><a href="../../index.html">All files</a> / <a href="index.html">music-core/utils</a> XMLUtils.ts</h1>
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<span class="cline-any cline-neutral">&nbsp;</span></td><td class="text"><pre class="prettyprint lang-js">/**
 * @file XML 解析工具
 * @description 提供 XML 解析和查询的辅助函数
 */
&nbsp;
/**
 * 获取元素的文本内容
 * @param element 父元素
 * @param tagName 子元素标签名
 * @returns 文本内容或 undefined
 */
export function getTextContent(element: Element, tagName: string): string | undefined {
  const child = element.querySelector(tagName);
  return child?.textContent?.trim() || undefined;
}
&nbsp;
/**
 * 获取元素的数字内容
 * @param element 父元素
 * @param tagName 子元素标签名
 * @returns 数字或 undefined
 */
export function getNumberContent(element: Element, tagName: string): number | undefined {
  const text = getTextContent(element, tagName);
  if (text === undefined) return undefined;
  const num = parseFloat(text);
  return isNaN(num) ? undefined : num;
}
&nbsp;
/**
 * 获取元素的整数内容
 * @param element 父元素
 * @param tagName 子元素标签名
 * @returns 整数或 undefined
 */
export function getIntContent(element: Element, tagName: string): number | undefined {
  const text = getTextContent(element, tagName);
  if (text === undefined) return undefined;
  const num = parseInt(text, 10);
  return isNaN(num<span class="branch-0 cbranch-no" title="branch not covered" >) ? undefined : n</span>um;
}
&nbsp;
/**
 * 获取元素的属性值
 * @param element 元素
 * @param attrName 属性名
 * @returns 属性值或 undefined
 */
export function getAttribute(element: Element, attrName: string): string | undefined {
  return element.getAttribute(attrName) || undefined;
}
&nbsp;
/**
 * 获取元素的数字属性
 * @param element 元素
 * @param attrName 属性名
 * @returns 数字或 undefined
 */
export function getNumberAttribute(element: Element, attrName: string): number | undefined {
  const text = getAttribute(element, attrName);
  if (text === undefined) <span class="branch-0 cbranch-no" title="branch not covered" >return undefined;</span>
  const num = parseFloat(text);
  return isNaN(num) ? undefined : num;
}
&nbsp;
/**
 * 获取元素的整数属性
 * @param element 元素
 * @param attrName 属性名
 * @returns 整数或 undefined
 */
export function getIntAttribute(element: Element, attrName: string): number | undefined {
  const text = getAttribute(element, attrName);
  if (text === undefined) <span class="branch-0 cbranch-no" title="branch not covered" >return undefined;</span>
  const num = parseInt(text, 10);
  return isNaN(num<span class="branch-0 cbranch-no" title="branch not covered" >) ? undefined : n</span>um;
}
&nbsp;
/**
 * 获取布尔属性（yes/no）
 * @param element 元素
 * @param attrName 属性名
 * @returns 布尔值或 undefined
 */
export function getBooleanAttribute(element: Element, attrName: string): boolean | undefined {
  const text = getAttribute(element, attrName);
  if (text === undefined) return undefined;
  return text === 'yes';
}
&nbsp;
/**
 * 获取所有指定标签的子元素
 * @param element 父元素
 * @param tagName 子元素标签名
 * @returns 子元素数组
 */
export function getChildren(element: Element, tagName: string): Element[] {
  return Array.from(element.querySelectorAll(`:scope &gt; ${tagName}`));
}
&nbsp;
/**
 * 获取第一个指定标签的子元素
 * @param element 父元素
 * @param tagName 子元素标签名
 * @returns 子元素或 undefined
 */
export function getChild(element: Element, tagName: string): Element | undefined {
  return element.querySelector(`:scope &gt; ${tagName}`) || undefined;
}
&nbsp;
/**
 * 检查元素是否存在指定的子元素
 * @param element 父元素
 * @param tagName 子元素标签名
 * @returns 是否存在
 */
export function hasChild(element: Element, tagName: string): boolean {
  return element.querySelector(`:scope &gt; ${tagName}`) !== null;
}
&nbsp;
/**
 * 获取元素自身的文本内容（不包含子元素）
 * @param element 元素
 * @returns 文本内容
 */
export function getOwnTextContent(element: Element): string {
  let text = '';
  for (const node of element.childNodes) {
    if (node.nodeType === Node.TEXT_NODE) {
      text += node.<span class="branch-0 cbranch-no" title="branch not covered" >textContent || '';</span>
    }
  }
  return text.trim();
}
&nbsp;
/**
 * 解析 MusicXML 字符串为 Document
 * @param xmlString XML 字符串
 * @returns Document 对象
 */
export function parseXML(xmlString: string): Document {
  const parser = new DOMParser();
  const doc = parser.parseFromString(xmlString, 'application/xml');
  
  // 检查解析错误
  const parseError = doc.querySelector('parsererror');
  if (parseError) {
    throw new Error(`XML 解析错误: ${parseError.textContent}`);
  }
  
  return doc;
}
&nbsp;
/**
 * 获取根元素
 * @param doc Document 对象
 * @returns 根元素
 */
export function getRootElement(doc: Document): Element {
  const root = doc.documentElement;
  if (!root) <span class="branch-0 cbranch-no" title="branch not covered" >{</span>
<span class="cstat-no" title="statement not covered" >    throw new Error('XML 文档没有根元素');</span>
<span class="cstat-no" title="statement not covered" >  }</span>
  return root;
}
&nbsp;
/**
 * 判断是否为 score-partwise 格式
 * @param doc Document 对象
 * @returns 是否为 score-partwise
 */
export function isScorePartwise(doc: Document): boolean {
  return doc.documentElement.tagName === 'score-partwise';
}
&nbsp;
/**
 * 判断是否为 score-timewise 格式
 * @param doc Document 对象
 * @returns 是否为 score-timewise
 */
export function isScoreTimewise(doc: Document): boolean {
  return doc.documentElement.tagName === 'score-timewise';
}
&nbsp;
/**
 * 遍历直接子元素
 * @param element 父元素
 * @param callback 回调函数
 */
export function forEachChild(
  element: Element, 
  callback: (child: Element, tagName: string, index: number) =&gt; void
): void {
  let index = 0;
  for (const child of element.children) {
    callback(child, child.tagName, index++);
  }
}
&nbsp;
/**
 * 收集直接子元素到 Map
 * @param element 父元素
 * @returns Map&lt;tagName, Element[]&gt;
 */
export function collectChildren(element: Element): Map&lt;string, Element[]&gt; {
  const result = new Map&lt;string, Element[]&gt;();
  
  for (const child of element.children) {
    const tagName = child.tagName;
    const list = result.get(tagName) ?? [];
    list.push(child);
    result.set(tagName, list);
  }
  
  return result;
}
&nbsp;</pre></td></tr></table></pre>

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