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<span class="cline-any cline-neutral">&nbsp;</span></td><td class="text"><pre class="prettyprint lang-js">/**
 * @file 属性解析器
 * @description 解析 MusicXML 中的 attributes 元素
 */
&nbsp;
import { Attributes, Transpose, StaffDetails } from '../models/Attributes';
import { KeySignature, TimeSignature, ClefDefinition, ClefSign, KeyMode, TimeSymbol } from '../models/types';
import { getChild, getChildren, getTextContent, getIntContent, getNumberContent, getAttribute, hasChild } from '../utils/XMLUtils';
&nbsp;
/**
 * 解析 key 元素
 */
export function parseKey(element: Element): KeySignature {
  const fifths = getIntContent(element, 'fifths'<span class="branch-0 cbranch-no" title="branch not covered" >) ?? 0;</span>
  const mode = getTextContent(element, 'mode') as KeyMode | undefined;
  const cancel = getIntContent(element, 'cancel');
  
  return {
    fifths,
    mode,
    cancel
  };
}
&nbsp;
/**
 * 解析 time 元素
 */
export function parseTime(element: Element): TimeSignature {
  const symbol = getAttribute(element, 'symbol') as TimeSymbol | undefined;
  
  // 处理多重拍号（如 3+2/8）
  const beatsElements = getChildren(element, 'beats');
  const beatTypeElements = getChildren(element, 'beat-type');
  
  let beats: number | number[];
  let beatType: number | number[];
  
  if (beatsElements.length &gt; 1) <span class="branch-0 cbranch-no" title="branch not covered" >{</span>
<span class="cstat-no" title="statement not covered" >    // 复合拍号</span>
<span class="cstat-no" title="statement not covered" >    beats = beatsElements.map(el =&gt; parseInt(el.textContent ?? '4', 10));</span>
<span class="cstat-no" title="statement not covered" >    beatType = beatTypeElements.map(el =&gt; parseInt(el.textContent ?? '4', 10));</span>
  } else {
    const beatsText = beatsElements[0]?.<span class="branch-0 cbranch-no" title="branch not covered" >textContent ?? '4';</span>
    const beatTypeText = beatTypeElements[0]?.<span class="branch-0 cbranch-no" title="branch not covered" >textContent ?? '4';</span>
    
    // 处理 "3+2" 格式
    if (beatsText.includes('+')) <span class="branch-0 cbranch-no" title="branch not covered" >{</span>
<span class="cstat-no" title="statement not covered" >      beats = beatsText.split('+').map(s =&gt; parseInt(s.trim(), 10));</span>
    } else {
      beats = parseInt(beatsText, 10);
    }
    
    beatType = parseInt(beatTypeText, 10);
  }
  
  return {
    beats,
    beatType,
    symbol
  };
}
&nbsp;
/**
 * 解析 clef 元素
 */
export <span class="fstat-no" title="function not covered" >function parseClef(element: Element): ClefDefinition {</span>
<span class="cstat-no" title="statement not covered" >  const sign = getTextContent(element, 'sign') as ClefSign;</span>
<span class="cstat-no" title="statement not covered" >  const line = getIntContent(element, 'line');</span>
<span class="cstat-no" title="statement not covered" >  const octaveChange = getIntContent(element, 'clef-octave-change');</span>
<span class="cstat-no" title="statement not covered" >  </span>
<span class="cstat-no" title="statement not covered" >  return {</span>
<span class="cstat-no" title="statement not covered" >    sign,</span>
<span class="cstat-no" title="statement not covered" >    line,</span>
<span class="cstat-no" title="statement not covered" >    octaveChange</span>
<span class="cstat-no" title="statement not covered" >  };</span>
<span class="cstat-no" title="statement not covered" >}</span>
&nbsp;
/**
 * 解析 transpose 元素
 */
export <span class="fstat-no" title="function not covered" >function parseTranspose(element: Element): Transpose {</span>
<span class="cstat-no" title="statement not covered" >  const chromatic = getIntContent(element, 'chromatic') ?? 0;</span>
<span class="cstat-no" title="statement not covered" >  const diatonic = getIntContent(element, 'diatonic');</span>
<span class="cstat-no" title="statement not covered" >  const octaveChange = getIntContent(element, 'octave-change');</span>
<span class="cstat-no" title="statement not covered" >  const double = hasChild(element, 'double');</span>
<span class="cstat-no" title="statement not covered" >  </span>
<span class="cstat-no" title="statement not covered" >  return {</span>
<span class="cstat-no" title="statement not covered" >    chromatic,</span>
<span class="cstat-no" title="statement not covered" >    diatonic,</span>
<span class="cstat-no" title="statement not covered" >    octaveChange,</span>
<span class="cstat-no" title="statement not covered" >    double: double || undefined</span>
<span class="cstat-no" title="statement not covered" >  };</span>
<span class="cstat-no" title="statement not covered" >}</span>
&nbsp;
/**
 * 解析 staff-details 元素
 */
export <span class="fstat-no" title="function not covered" >function parseStaffDetails(element: Element): StaffDetails {</span>
<span class="cstat-no" title="statement not covered" >  const staffLines = getIntContent(element, 'staff-lines');</span>
<span class="cstat-no" title="statement not covered" >  const staffType = getAttribute(element, 'staff-type') as StaffDetails['staffType'];</span>
<span class="cstat-no" title="statement not covered" >  const capo = getIntContent(element, 'capo');</span>
<span class="cstat-no" title="statement not covered" >  const staffSize = getNumberContent(element, 'staff-size');</span>
<span class="cstat-no" title="statement not covered" >  </span>
<span class="cstat-no" title="statement not covered" >  // 解析调弦信息</span>
<span class="cstat-no" title="statement not covered" >  const staffTuningElements = getChildren(element, 'staff-tuning');</span>
<span class="cstat-no" title="statement not covered" >  const staffTuning = staffTuningElements.length &gt; 0</span>
<span class="cstat-no" title="statement not covered" >    ? staffTuningElements.map(el =&gt; ({</span>
<span class="cstat-no" title="statement not covered" >        line: getIntContent(el, 'line') ?? parseInt(getAttribute(el, 'line') ?? '1', 10),</span>
<span class="cstat-no" title="statement not covered" >        tuningStep: getTextContent(el, 'tuning-step') ?? 'E',</span>
<span class="cstat-no" title="statement not covered" >        tuningOctave: getIntContent(el, 'tuning-octave') ?? 4,</span>
<span class="cstat-no" title="statement not covered" >        tuningAlter: getNumberContent(el, 'tuning-alter')</span>
<span class="cstat-no" title="statement not covered" >      }))</span>
<span class="cstat-no" title="statement not covered" >    : undefined;</span>
<span class="cstat-no" title="statement not covered" >  </span>
<span class="cstat-no" title="statement not covered" >  return {</span>
<span class="cstat-no" title="statement not covered" >    staffLines,</span>
<span class="cstat-no" title="statement not covered" >    staffType,</span>
<span class="cstat-no" title="statement not covered" >    staffTuning,</span>
<span class="cstat-no" title="statement not covered" >    capo,</span>
<span class="cstat-no" title="statement not covered" >    staffSize</span>
<span class="cstat-no" title="statement not covered" >  };</span>
<span class="cstat-no" title="statement not covered" >}</span>
&nbsp;
/**
 * 解析 attributes 元素
 */
export function parseAttributes(element: Element): Attributes {
  // divisions
  const divisions = getIntContent(element, 'divisions');
  
  // key（可能有多个）
  const keyElements = getChildren(element, 'key');
  const key = keyElements.length &gt; 0 
    ? keyElements.map(parseKey) 
    : undefined;
  
  // time（可能有多个）
  const timeElements = getChildren(element, 'time');
  const time = timeElements.length &gt; 0 
    ? timeElements.map(parseTime) 
    : undefined;
  
  // staves
  const staves = getIntContent(element, 'staves');
  
  // clef（可能有多个）
  const clefElements = getChildren(element, 'clef');
  const clef = clefElements.length &gt; <span class="branch-0 cbranch-no" title="branch not covered" >0 </span>
<span class="cstat-no" title="statement not covered" >    ? clefElements.map(parseClef) </span>
    : undefined;
  
  // staff-details（可能有多个）
  const staffDetailsElements = getChildren(element, 'staff-details');
  const staffDetails = staffDetailsElements.length &gt; <span class="branch-0 cbranch-no" title="branch not covered" >0 </span>
<span class="cstat-no" title="statement not covered" >    ? staffDetailsElements.map(parseStaffDetails) </span>
    : undefined;
  
  // transpose（可能有多个）
  const transposeElements = getChildren(element, 'transpose');
  const transpose = transposeElements.length &gt; <span class="branch-0 cbranch-no" title="branch not covered" >0 </span>
<span class="cstat-no" title="statement not covered" >    ? transposeElements.map(parseTranspose) </span>
    : undefined;
  
  // instruments
  const instruments = getIntContent(element, 'instruments');
  
  return new Attributes({
    divisions,
    key,
    time,
    staves,
    clef,
    staffDetails,
    transpose,
    instruments
  });
}
&nbsp;</pre></td></tr></table></pre>

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