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* @file 属性解析器
* @description 解析 MusicXML 中的 attributes 元素
*/
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';
/**
* 解析 key 元素
*/
export function parseKey(element: Element): KeySignature {
const fifths = getIntContent(element, 'fifths') ?? 0;
const mode = getTextContent(element, 'mode') as KeyMode | undefined;
const cancel = getIntContent(element, 'cancel');
return {
fifths,
mode,
cancel
};
}
/**
* 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 > 1) {
// 复合拍号
beats = beatsElements.map(el => parseInt(el.textContent ?? '4', 10));
beatType = beatTypeElements.map(el => parseInt(el.textContent ?? '4', 10));
} else {
const beatsText = beatsElements[0]?.textContent ?? '4';
const beatTypeText = beatTypeElements[0]?.textContent ?? '4';
// 处理 "3+2" 格式
if (beatsText.includes('+')) {
beats = beatsText.split('+').map(s => parseInt(s.trim(), 10));
} else {
beats = parseInt(beatsText, 10);
}
beatType = parseInt(beatTypeText, 10);
}
return {
beats,
beatType,
symbol
};
}
/**
* 解析 clef 元素
*/
export function parseClef(element: Element): ClefDefinition {
const sign = getTextContent(element, 'sign') as ClefSign;
const line = getIntContent(element, 'line');
const octaveChange = getIntContent(element, 'clef-octave-change');
return {
sign,
line,
octaveChange
};
}
/**
* 解析 transpose 元素
*/
export function parseTranspose(element: Element): Transpose {
const chromatic = getIntContent(element, 'chromatic') ?? 0;
const diatonic = getIntContent(element, 'diatonic');
const octaveChange = getIntContent(element, 'octave-change');
const double = hasChild(element, 'double');
return {
chromatic,
diatonic,
octaveChange,
double: double || undefined
};
}
/**
* 解析 staff-details 元素
*/
export function parseStaffDetails(element: Element): StaffDetails {
const staffLines = getIntContent(element, 'staff-lines');
const staffType = getAttribute(element, 'staff-type') as StaffDetails['staffType'];
const capo = getIntContent(element, 'capo');
const staffSize = getNumberContent(element, 'staff-size');
// 解析调弦信息
const staffTuningElements = getChildren(element, 'staff-tuning');
const staffTuning = staffTuningElements.length > 0
? staffTuningElements.map(el => ({
line: getIntContent(el, 'line') ?? parseInt(getAttribute(el, 'line') ?? '1', 10),
tuningStep: getTextContent(el, 'tuning-step') ?? 'E',
tuningOctave: getIntContent(el, 'tuning-octave') ?? 4,
tuningAlter: getNumberContent(el, 'tuning-alter')
}))
: undefined;
return {
staffLines,
staffType,
staffTuning,
capo,
staffSize
};
}
/**
* 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 > 0
? keyElements.map(parseKey)
: undefined;
// time（可能有多个）
const timeElements = getChildren(element, 'time');
const time = timeElements.length > 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 > 0
? clefElements.map(parseClef)
: undefined;
// staff-details（可能有多个）
const staffDetailsElements = getChildren(element, 'staff-details');
const staffDetails = staffDetailsElements.length > 0
? staffDetailsElements.map(parseStaffDetails)
: undefined;
// transpose（可能有多个）
const transposeElements = getChildren(element, 'transpose');
const transpose = transposeElements.length > 0
? transposeElements.map(parseTranspose)
: undefined;
// instruments
const instruments = getIntContent(element, 'instruments');
return new Attributes({
divisions,
key,
time,
staves,
clef,
staffDetails,
transpose,
instruments
});
}
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