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* @file 方向解析器
* @description 解析 MusicXML 中的 direction 元素
*/
import {
Direction, DirectionTypeContent, Sound,
Metronome, Dynamics, Wedge, Words, Rehearsal, OctaveShift, Pedal
} from '../models/Direction';
import { DynamicType, WedgeType, Placement } from '../models/types';
import { getChild, getChildren, getTextContent, getIntContent, getNumberContent, getAttribute, getBooleanAttribute, hasChild } from '../utils/XMLUtils';
/**
* 解析 metronome 元素
*/
export function parseMetronome(element: Element): Metronome {
const beatUnit = getTextContent(element, 'beat-unit') ?? 'quarter';
const beatUnitDot = hasChild(element, 'beat-unit-dot');
const perMinute = getIntContent(element, 'per-minute');
const parentheses = getBooleanAttribute(element, 'parentheses');
// 检查是否有等于另一个节拍的情况
let beatUnitEquals: Metronome['beatUnitEquals'];
const beatUnitElements = getChildren(element, 'beat-unit');
if (beatUnitElements.length > 1) {
beatUnitEquals = {
beatUnit: beatUnitElements[1].textContent ?? 'quarter',
beatUnitDot: getChildren(element, 'beat-unit-dot').length > 1
};
}
return {
beatUnit,
beatUnitDot,
perMinute,
beatUnitEquals,
parentheses
};
}
/**
* 解析 dynamics 元素
*/
export function parseDynamics(element: Element): Dynamics[] {
const dynamics: Dynamics[] = [];
const placement = getAttribute(element, 'placement') as Placement | undefined;
// 力度标记通常是空元素，标签名就是力度类型
for (const child of element.children) {
dynamics.push({
type: child.tagName as DynamicType,
placement
});
}
// 如果没有子元素但有文字内容
if (dynamics.length === 0 && element.textContent?.trim()) {
dynamics.push({
type: element.textContent.trim() as DynamicType,
placement
});
}
return dynamics;
}
/**
* 解析 wedge 元素
*/
export function parseWedge(element: Element): Wedge {
const type = getAttribute(element, 'type') as WedgeType;
const number = getIntContent(element, 'number');
const spread = getNumberContent(element, 'spread');
return { type, number, spread };
}
/**
* 解析 words 元素
*/
export function parseWords(element: Element): Words {
return {
text: element.textContent?.trim() ?? '',
fontFamily: getAttribute(element, 'font-family'),
fontSize: getAttribute(element, 'font-size'),
fontWeight: getAttribute(element, 'font-weight') as 'normal' | 'bold' | undefined,
fontStyle: getAttribute(element, 'font-style') as 'normal' | 'italic' | undefined,
placement: getAttribute(element, 'placement') as Placement | undefined,
lang: getAttribute(element, 'xml:lang')
};
}
/**
* 解析 rehearsal 元素
*/
export function parseRehearsal(element: Element): Rehearsal {
return {
text: element.textContent?.trim() ?? '',
enclosure: getAttribute(element, 'enclosure') as Rehearsal['enclosure']
};
}
/**
* 解析 octave-shift 元素
*/
export function parseOctaveShift(element: Element): OctaveShift {
return {
type: getAttribute(element, 'type') as 'up' | 'down' | 'stop' | 'continue',
size: getIntContent(element, 'size'),
number: getIntContent(element, 'number')
};
}
/**
* 解析 pedal 元素
*/
export function parsePedal(element: Element): Pedal {
return {
type: getAttribute(element, 'type') as Pedal['type'],
line: getBooleanAttribute(element, 'line'),
sign: getBooleanAttribute(element, 'sign')
};
}
/**
* 解析 direction-type 元素
*/
export function parseDirectionType(element: Element): DirectionTypeContent {
const content: DirectionTypeContent = {};
for (const child of element.children) {
switch (child.tagName) {
case 'metronome':
content.metronome = parseMetronome(child);
break;
case 'dynamics':
content.dynamics = parseDynamics(child);
break;
case 'wedge':
content.wedge = parseWedge(child);
break;
case 'words':
content.words = content.words ?? [];
content.words.push(parseWords(child));
break;
case 'rehearsal':
content.rehearsal = parseRehearsal(child);
break;
case 'octave-shift':
content.octaveShift = parseOctaveShift(child);
break;
case 'pedal':
content.pedal = parsePedal(child);
break;
case 'segno':
content.segno = true;
break;
case 'coda':
content.coda = true;
break;
case 'bracket':
content.bracket = {
type: getAttribute(child, 'type') as 'start' | 'stop',
lineType: getAttribute(child, 'line-type')
};
break;
case 'dashes':
content.dashes = {
type: getAttribute(child, 'type') as 'start' | 'stop'
};
break;
case 'symbol':
content.symbol = child.textContent?.trim();
break;
}
}
return content;
}
/**
* 解析 sound 元素
*/
export function parseSound(element: Element): Sound {
return {
tempo: getNumberContent(element, 'tempo') ?? (
getAttribute(element, 'tempo') ? parseFloat(getAttribute(element, 'tempo')!) : undefined
),
dynamics: getNumberContent(element, 'dynamics') ?? (
getAttribute(element, 'dynamics') ? parseFloat(getAttribute(element, 'dynamics')!) : undefined
),
dacapo: getBooleanAttribute(element, 'dacapo'),
segno: getAttribute(element, 'segno'),
dalsegno: getAttribute(element, 'dalsegno'),
coda: getAttribute(element, 'coda'),
tocoda: getAttribute(element, 'tocoda'),
fine: getAttribute(element, 'fine'),
forwardRepeat: getBooleanAttribute(element, 'forward-repeat'),
timeOnly: getAttribute(element, 'time-only')
};
}
/**
* 解析 direction 元素
*/
export function parseDirection(element: Element): Direction {
// 解析所有 direction-type
const directionTypeElements = getChildren(element, 'direction-type');
const directionTypes = directionTypeElements.map(parseDirectionType);
// 位置
const placement = getAttribute(element, 'placement') as Placement | undefined;
// directive
const directive = getBooleanAttribute(element, 'directive');
// 声部和谱表
const voice = getIntContent(element, 'voice');
const staff = getIntContent(element, 'staff');
// 偏移
const offset = getIntContent(element, 'offset');
// sound
const soundEl = getChild(element, 'sound');
const sound = soundEl ? parseSound(soundEl) : undefined;
return new Direction({
directionTypes,
placement,
directive,
voice,
staff,
offset,
sound
});
}
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