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* @file 结构解析器
* @description 解析 MusicXML 的整体结构（score, part-list, part, measure）
*/
import { Score, Work, Identification, Creator, Encoding, Defaults, Credit, PartListItem, PartGroup } from '../models/Score';
import { Part, ScorePartDefinition, ScoreInstrument, MidiInstrument } from '../models/Part';
import { Measure, MeasureElement, Backup, Forward } from '../models/Measure';
import { getChild, getChildren, getTextContent, getIntContent, getNumberContent, getAttribute, hasChild, forEachChild } from '../utils/XMLUtils';
import { parseNote } from './NoteParser';
import { parseAttributes } from './AttributesParser';
import { parseDirection } from './DirectionParser';
import { parseBarline, parseHarmony } from './BarlineParser';
/**
* 解析 work 元素
*/
export function parseWork(element: Element): Work {
return {
workNumber: getTextContent(element, 'work-number'),
workTitle: getTextContent(element, 'work-title'),
opus: hasChild(element, 'opus')
? { href: getAttribute(getChild(element, 'opus')!, 'href') ?? '' }
: undefined
};
}
/**
* 解析 identification 元素
*/
export function parseIdentification(element: Element): Identification {
// creators
const creatorElements = getChildren(element, 'creator');
const creators: Creator[] = creatorElements.map(el => ({
type: getAttribute(el, 'type'),
name: el.textContent?.trim() ?? ''
}));
// rights
const rightsElements = getChildren(element, 'rights');
const rights = rightsElements.map(el => el.textContent?.trim() ?? '');
// encoding
const encodingEl = getChild(element, 'encoding');
let encoding: Encoding | undefined;
if (encodingEl) {
encoding = {
encodingDate: getTextContent(encodingEl, 'encoding-date'),
encoder: getTextContent(encodingEl, 'encoder'),
software: getTextContent(encodingEl, 'software'),
encodingDescription: getTextContent(encodingEl, 'encoding-description')
};
}
// source
const source = getTextContent(element, 'source');
return {
creators: creators.length > 0 ? creators : undefined,
rights: rights.length > 0 ? rights : undefined,
encoding,
source
};
}
/**
* 解析 defaults 元素
*/
export function parseDefaults(element: Element): Defaults {
const defaults: Defaults = {};
// scaling
const scalingEl = getChild(element, 'scaling');
if (scalingEl) {
defaults.scaling = {
millimeters: getNumberContent(scalingEl, 'millimeters'),
tenths: getNumberContent(scalingEl, 'tenths')
};
}
// page-layout
const pageLayoutEl = getChild(element, 'page-layout');
if (pageLayoutEl) {
defaults.pageLayout = {
pageHeight: getNumberContent(pageLayoutEl, 'page-height'),
pageWidth: getNumberContent(pageLayoutEl, 'page-width')
};
}
// system-layout
const systemLayoutEl = getChild(element, 'system-layout');
if (systemLayoutEl) {
defaults.systemLayout = {
systemDistance: getNumberContent(systemLayoutEl, 'system-distance'),
topSystemDistance: getNumberContent(systemLayoutEl, 'top-system-distance')
};
}
return defaults;
}
/**
* 解析 credit 元素
*/
export function parseCredit(element: Element): Credit {
const page = getIntContent(element, 'page');
// credit-words
const creditWordsElements = getChildren(element, 'credit-words');
const creditWords = creditWordsElements.map(el => ({
text: el.textContent?.trim() ?? '',
defaultX: getNumberContent(el, 'default-x'),
defaultY: getNumberContent(el, 'default-y'),
fontSize: getAttribute(el, 'font-size'),
fontWeight: getAttribute(el, 'font-weight') as 'normal' | 'bold' | undefined,
fontStyle: getAttribute(el, 'font-style') as 'normal' | 'italic' | undefined,
justify: getAttribute(el, 'justify') as 'left' | 'center' | 'right' | undefined,
valign: getAttribute(el, 'valign') as 'top' | 'middle' | 'bottom' | 'baseline' | undefined
}));
// credit-type
const creditTypeElements = getChildren(element, 'credit-type');
const creditType = creditTypeElements.map(el => el.textContent?.trim() ?? '');
return {
page,
creditWords: creditWords.length > 0 ? creditWords : undefined,
creditType: creditType.length > 0 ? creditType : undefined
};
}
/**
* 解析 score-instrument 元素
*/
function parseScoreInstrument(element: Element): ScoreInstrument {
return {
id: getAttribute(element, 'id') ?? '',
instrumentName: getTextContent(element, 'instrument-name') ?? '',
instrumentAbbreviation: getTextContent(element, 'instrument-abbreviation'),
instrumentSound: getTextContent(element, 'instrument-sound')
};
}
/**
* 解析 midi-instrument 元素
*/
function parseMidiInstrument(element: Element): MidiInstrument {
return {
id: getAttribute(element, 'id') ?? '',
midiChannel: getIntContent(element, 'midi-channel'),
midiName: getTextContent(element, 'midi-name'),
midiBank: getIntContent(element, 'midi-bank'),
midiProgram: getIntContent(element, 'midi-program'),
midiUnpitched: getIntContent(element, 'midi-unpitched'),
volume: getNumberContent(element, 'volume'),
pan: getNumberContent(element, 'pan'),
elevation: getNumberContent(element, 'elevation')
};
}
/**
* 解析 score-part 元素
*/
export function parseScorePart(element: Element): ScorePartDefinition {
const id = getAttribute(element, 'id') ?? '';
const partName = getTextContent(element, 'part-name') ?? '';
const partAbbreviation = getTextContent(element, 'part-abbreviation');
const group = getTextContent(element, 'group');
// score-instruments
const scoreInstrumentElements = getChildren(element, 'score-instrument');
const scoreInstruments = scoreInstrumentElements.length > 0
? scoreInstrumentElements.map(parseScoreInstrument)
: undefined;
// midi-instruments
const midiInstrumentElements = getChildren(element, 'midi-instrument');
const midiInstruments = midiInstrumentElements.length > 0
? midiInstrumentElements.map(parseMidiInstrument)
: undefined;
return {
id,
partName,
partAbbreviation,
group,
scoreInstruments,
midiInstruments
};
}
/**
* 解析 part-group 元素
*/
export function parsePartGroup(element: Element): PartGroup {
return {
type: getAttribute(element, 'type') as 'start' | 'stop',
number: getAttribute(element, 'number'),
groupName: getTextContent(element, 'group-name'),
groupAbbreviation: getTextContent(element, 'group-abbreviation'),
groupSymbol: getTextContent(element, 'group-symbol') as PartGroup['groupSymbol'],
groupBarline: getTextContent(element, 'group-barline') as PartGroup['groupBarline']
};
}
/**
* 解析 part-list 元素
*/
export function parsePartList(element: Element): PartListItem[] {
const items: PartListItem[] = [];
for (const child of element.children) {
if (child.tagName === 'score-part') {
items.push({ type: 'part', data: parseScorePart(child) });
} else if (child.tagName === 'part-group') {
items.push({ type: 'group', data: parsePartGroup(child) });
}
}
return items;
}
/**
* 解析 backup 元素
*/
function parseBackup(element: Element): Backup {
return {
duration: getIntContent(element, 'duration') ?? 0
};
}
/**
* 解析 forward 元素
*/
function parseForward(element: Element): Forward {
return {
duration: getIntContent(element, 'duration') ?? 0,
voice: getIntContent(element, 'voice'),
staff: getIntContent(element, 'staff')
};
}
/**
* 解析 measure 元素
*/
export function parseMeasure(element: Element): Measure {
const number = getAttribute(element, 'number') ?? '1';
const width = getNumberContent(element, 'width');
const implicit = getAttribute(element, 'implicit') === 'yes';
const nonControlling = getAttribute(element, 'non-controlling') === 'yes';
const elements: MeasureElement[] = [];
for (const child of element.children) {
switch (child.tagName) {
case 'note':
elements.push({ type: 'note', data: parseNote(child) });
break;
case 'backup':
elements.push({ type: 'backup', data: parseBackup(child) });
break;
case 'forward':
elements.push({ type: 'forward', data: parseForward(child) });
break;
case 'direction':
elements.push({ type: 'direction', data: parseDirection(child) });
break;
case 'attributes':
elements.push({ type: 'attributes', data: parseAttributes(child) });
break;
case 'harmony':
elements.push({ type: 'harmony', data: parseHarmony(child) });
break;
case 'barline':
elements.push({ type: 'barline', data: parseBarline(child) });
break;
// 忽略其他元素（print, sound 等已在其他地方处理）
}
}
return new Measure({
number,
elements,
width,
implicit,
nonControlling
});
}
/**
* 解析 part 元素
*/
export function parsePart(element: Element, definition?: ScorePartDefinition): Part {
const id = getAttribute(element, 'id') ?? '';
// 解析所有小节
const measureElements = getChildren(element, 'measure');
const measures = measureElements.map(parseMeasure);
return new Part({
id,
definition,
measures
});
}
/**
* 解析 score-partwise 格式的乐谱
*/
export function parseScorePartwise(root: Element): Score {
// 版本
const version = getAttribute(root, 'version');
// work
const workEl = getChild(root, 'work');
const work = workEl ? parseWork(workEl) : undefined;
// movement-number, movement-title
const movementNumber = getTextContent(root, 'movement-number');
const movementTitle = getTextContent(root, 'movement-title');
// identification
const identificationEl = getChild(root, 'identification');
const identification = identificationEl ? parseIdentification(identificationEl) : undefined;
// defaults
const defaultsEl = getChild(root, 'defaults');
const defaults = defaultsEl ? parseDefaults(defaultsEl) : undefined;
// credits
const creditElements = getChildren(root, 'credit');
const credits = creditElements.length > 0 ? creditElements.map(parseCredit) : undefined;
// part-list
const partListEl = getChild(root, 'part-list');
const partList = partListEl ? parsePartList(partListEl) : [];
// 构建声部定义映射
const partDefinitionMap = new Map<string, ScorePartDefinition>();
for (const item of partList) {
if (item.type === 'part') {
partDefinitionMap.set(item.data.id, item.data);
}
}
// parts
const partElements = getChildren(root, 'part');
const parts = partElements.map(el => {
const partId = getAttribute(el, 'id') ?? '';
return parsePart(el, partDefinitionMap.get(partId));
});
return new Score({
version,
work,
movementNumber,
movementTitle,
identification,
defaults,
credits,
partList,
parts
});
}
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