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* @file 音符解析器
* @description 解析 MusicXML 中的 note 元素
*/
import { Note, TimeModification, TieInfo, BeamInfo, Lyric, GraceNote, NoteNotations } from '../models/Note';
import { Pitch, Rest, Unpitched } from '../models/Pitch';
import { Notations, TiedNotation, SlurNotation, TupletNotation, Articulation, Ornament } from '../models/Notations';
import { StepName, NoteType, StemDirection, BeamType, AccidentalType, TieSlurType, SyllabicType, Placement, ArticulationType, OrnamentType } from '../models/types';
import { getChild, getChildren, getTextContent, getIntContent, getNumberContent, getAttribute, getBooleanAttribute, hasChild } from '../utils/XMLUtils';
/**
* 解析 pitch 元素
*/
export function parsePitch(element: Element): Pitch {
const stepText = getTextContent(element, 'step');
const octaveNum = getIntContent(element, 'octave');
const alterNum = getNumberContent(element, 'alter');
if (!stepText || octaveNum === undefined) {
throw new Error('Invalid pitch element: missing step or octave');
}
return new Pitch({
step: stepText as StepName,
octave: octaveNum,
alter: (alterNum ?? 0) as any
});
}
/**
* 解析 rest 元素
*/
export function parseRest(element: Element): Rest {
const measure = hasChild(element, 'measure') || getAttribute(element, 'measure') === 'yes';
const displayStep = getTextContent(element, 'display-step') as StepName | undefined;
const displayOctave = getIntContent(element, 'display-octave');
return new Rest({
measure,
displayStep,
displayOctave
});
}
/**
* 解析 unpitched 元素
*/
export function parseUnpitched(element: Element): Unpitched {
const displayStep = getTextContent(element, 'display-step');
const displayOctave = getIntContent(element, 'display-octave');
if (!displayStep || displayOctave === undefined) {
throw new Error('Invalid unpitched element: missing display-step or display-octave');
}
return new Unpitched({
displayStep: displayStep as StepName,
displayOctave
});
}
/**
* 解析 time-modification 元素（连音符）
*/
export function parseTimeModification(element: Element): TimeModification {
const actualNotes = getIntContent(element, 'actual-notes');
const normalNotes = getIntContent(element, 'normal-notes');
const normalType = getTextContent(element, 'normal-type') as NoteType | undefined;
const normalDots = getChildren(element, 'normal-dot').length;
if (actualNotes === undefined || normalNotes === undefined) {
throw new Error('Invalid time-modification: missing actual-notes or normal-notes');
}
return {
actualNotes,
normalNotes,
normalType,
normalDots: normalDots > 0 ? normalDots : undefined
};
}
/**
* 解析 tie 元素
*/
export function parseTie(element: Element): TieInfo {
const type = getAttribute(element, 'type') as TieSlurType;
const number = getIntContent(element, 'number');
return { type, number };
}
/**
* 解析 beam 元素
*/
export function parseBeam(element: Element): BeamInfo {
const number = parseInt(getAttribute(element, 'number') ?? '1', 10);
const type = element.textContent?.trim() as BeamType;
return { number, type };
}
/**
* 解析 lyric 元素
*/
export function parseLyric(element: Element): Lyric {
const number = getAttribute(element, 'number');
const syllabic = getTextContent(element, 'syllabic') as SyllabicType | undefined;
const text = getTextContent(element, 'text') ?? '';
const extend = hasChild(element, 'extend');
const elision = hasChild(element, 'elision');
return {
number,
syllabic,
text,
extend,
elision
};
}
/**
* 解析 grace 元素
*/
export function parseGrace(element: Element): GraceNote {
const slash = getBooleanAttribute(element, 'slash');
const stealTimePrevious = getNumberContent(element, 'steal-time-previous');
const stealTimeFollowing = getNumberContent(element, 'steal-time-following');
const makeTime = getNumberContent(element, 'make-time');
return {
slash,
stealTimePrevious,
stealTimeFollowing,
makeTime
};
}
/**
* 解析 notations 元素中的 tied
*/
function parseTiedNotation(element: Element): TiedNotation {
return {
type: getAttribute(element, 'type') as TieSlurType,
number: getIntContent(element, 'number'),
placement: getAttribute(element, 'placement') as Placement | undefined,
orientation: getAttribute(element, 'orientation') as 'over' | 'under' | undefined
};
}
/**
* 解析 notations 元素中的 slur
*/
function parseSlurNotation(element: Element): SlurNotation {
return {
type: getAttribute(element, 'type') as TieSlurType,
number: getIntContent(element, 'number') ?? 1,
placement: getAttribute(element, 'placement') as Placement | undefined
};
}
/**
* 解析 notations 元素中的 tuplet
*/
function parseTupletNotation(element: Element): TupletNotation {
return {
type: getAttribute(element, 'type') as 'start' | 'stop',
number: getIntContent(element, 'number'),
bracket: getBooleanAttribute(element, 'bracket'),
showNumber: getAttribute(element, 'show-number') as 'actual' | 'both' | 'none' | undefined,
placement: getAttribute(element, 'placement') as Placement | undefined
};
}
/**
* 解析 articulations 元素
*/
function parseArticulations(element: Element): Articulation[] {
const articulations: Articulation[] = [];
const articulationTypes: ArticulationType[] = [
'accent', 'strong-accent', 'staccato', 'tenuto', 'detached-legato',
'staccatissimo', 'spiccato', 'scoop', 'plop', 'doit', 'falloff',
'breath-mark', 'caesura', 'stress', 'unstress', 'soft-accent'
];
for (const child of element.children) {
const type = child.tagName as ArticulationType;
if (articulationTypes.includes(type)) {
articulations.push({
type,
placement: getAttribute(child, 'placement') as Placement | undefined
});
}
}
return articulations;
}
/**
* 解析 ornaments 元素
*/
function parseOrnaments(element: Element): Ornament[] {
const ornaments: Ornament[] = [];
const ornamentTypes: OrnamentType[] = [
'trill-mark', 'turn', 'delayed-turn', 'inverted-turn', 'delayed-inverted-turn',
'vertical-turn', 'inverted-vertical-turn', 'shake', 'wavy-line', 'mordent',
'inverted-mordent', 'schleifer', 'tremolo', 'haydn', 'other-ornament'
];
for (const child of element.children) {
const type = child.tagName as OrnamentType;
if (ornamentTypes.includes(type)) {
ornaments.push({
type,
placement: getAttribute(child, 'placement') as Placement | undefined
});
}
}
return ornaments;
}
/**
* 解析 notations 元素
*/
export function parseNotations(element: Element): Notations {
const tied: TiedNotation[] = [];
const slur: SlurNotation[] = [];
const tuplet: TupletNotation[] = [];
let articulations: Articulation[] = [];
let ornaments: Ornament[] = [];
const dynamics: string[] = [];
for (const child of element.children) {
switch (child.tagName) {
case 'tied':
tied.push(parseTiedNotation(child));
break;
case 'slur':
slur.push(parseSlurNotation(child));
break;
case 'tuplet':
tuplet.push(parseTupletNotation(child));
break;
case 'articulations':
articulations = parseArticulations(child);
break;
case 'ornaments':
ornaments = parseOrnaments(child);
break;
case 'dynamics':
// 力度标记，获取第一个子元素的标签名
for (const dynChild of child.children) {
dynamics.push(dynChild.tagName);
}
break;
case 'fermata':
// 延音记号，简单处理
break;
}
}
return new Notations({
tied: tied.length > 0 ? tied : undefined,
slur: slur.length > 0 ? slur : undefined,
tuplet: tuplet.length > 0 ? tuplet : undefined,
articulations: articulations.length > 0 ? articulations : undefined,
ornaments: ornaments.length > 0 ? ornaments : undefined,
dynamics: dynamics.length > 0 ? dynamics : undefined
});
}
/**
* 解析 note 元素
*/
export function parseNote(element: Element): Note {
// 音高/休止符/无固定音高
let pitch: Pitch | undefined;
let rest: Rest | undefined;
let unpitched: Unpitched | undefined;
const pitchEl = getChild(element, 'pitch');
const restEl = getChild(element, 'rest');
const unpitchedEl = getChild(element, 'unpitched');
if (pitchEl) {
pitch = parsePitch(pitchEl);
} else if (restEl) {
rest = parseRest(restEl);
} else if (unpitchedEl) {
unpitched = parseUnpitched(unpitchedEl);
}
// 时值
const duration = getIntContent(element, 'duration') ?? 0;
const type = getTextContent(element, 'type') as NoteType | undefined;
const dots = getChildren(element, 'dot').length;
// 连音符
const timeModEl = getChild(element, 'time-modification');
const timeModification = timeModEl ? parseTimeModification(timeModEl) : undefined;
// 和弦
const chord = hasChild(element, 'chord');
// 装饰音
const graceEl = getChild(element, 'grace');
const grace = graceEl ? parseGrace(graceEl) : undefined;
// 提示音
const cue = hasChild(element, 'cue');
// 连音线
const tieElements = getChildren(element, 'tie');
const ties = tieElements.length > 0
? tieElements.map(parseTie)
: undefined;
// 符杠
const beamElements = getChildren(element, 'beam');
const beams = beamElements.length > 0
? beamElements.map(parseBeam)
: undefined;
// 符干
const stemText = getTextContent(element, 'stem');
const stem = stemText as StemDirection | undefined;
// 临时记号
const accidentalEl = getChild(element, 'accidental');
const accidental = accidentalEl?.textContent?.trim() as AccidentalType | undefined;
const accidentalBracket = accidentalEl ? getBooleanAttribute(accidentalEl, 'bracket') : undefined;
const accidentalCourtesy = accidentalEl ? getBooleanAttribute(accidentalEl, 'courtesy') : undefined;
// 声部和谱表
const voice = getIntContent(element, 'voice') ?? 1;
const staff = getIntContent(element, 'staff') ?? 1;
// 歌词
const lyricElements = getChildren(element, 'lyric');
const lyrics = lyricElements.length > 0
? lyricElements.map(parseLyric)
: undefined;
// 乐器
const instrumentEl = getChild(element, 'instrument');
const instrumentId = instrumentEl ? getAttribute(instrumentEl, 'id') : undefined;
// 记号
const notationsEl = getChild(element, 'notations');
const notationsData = notationsEl ? parseNotations(notationsEl) : undefined;
// ID
const id = getAttribute(element, 'id');
return new Note({
id,
pitch,
rest,
unpitched,
duration,
type,
dots,
timeModification,
chord,
grace,
cue,
ties,
beams,
stem,
accidental,
accidentalBracket: accidentalBracket ?? false,
accidentalCourtesy: accidentalCourtesy ?? false,
voice,
staff,
lyrics,
instrumentId,
notations: notationsData ? {
tied: notationsData.tied,
slurs: notationsData.slur,
tuplet: notationsData.tuplet?.[0],
articulations: notationsData.getArticulationNames(),
ornaments: notationsData.getOrnamentNames(),
dynamics: notationsData.dynamics
} : undefined
});
}
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