add IOSize.parse

src/utils/IOSize.ts

@@ -77,4 +77,96 @@ export default class IOSize {
 		}
 		return "0 B";
 	}
+
+	/**
+	 * 将格式化的储存量字符串解析为字节量
+	 * <p>支持格式：10GB, 10 GB, 1TB, 1.24 KB 等（单位不区分大小写）</p>
+	 * <pre>
+	 *     // 返回 102400
+	 *     IOSize.parse("100 KB");
+	 *     // 返回 1073741824
+	 *     IOSize.parse("1GB");
+	 * </pre>
+	 *
+	 * @param sizeStr 格式化后的储存量字符串
+	 * @return 字节量
+	 * @throws Error 格式无效
+	 */
+	public static parse(sizeStr: string): number {
+		if (!sizeStr || sizeStr.trim() === "") {
+			throw new Error("not found sizeStr");
+		}
+		// 正则匹配：可选符号 + 数字（含小数点）+ 可选空格 + 单位
+		const pattern = /([-+]?\d+(?:\.\d+)?)\s*([a-zA-Z]+)/;
+		const matcher = pattern.exec(sizeStr.trim());
+		if (matcher) {
+			let value: number;
+			try {
+				value = parseFloat(matcher[1]);
+			} catch (e) {
+				throw new Error("invalid number format: " + matcher[1]);
+			}
+			if (value < 0) {
+				throw new Error("size cannot be negative: " + value);
+			}
+			const unitStr = matcher[2].toUpperCase();
+			let unit: Unit;
+
+			// 先尝试精确匹配枚举
+			if (Object.values(Unit).includes(unitStr as Unit)) {
+				unit = unitStr as Unit;
+			} else {
+				// 处理单字母单位缩写（K/M/G/T/P/E）
+				switch (unitStr.charAt(0)) {
+					case "K":
+						unit = Unit.KB;
+						break;
+					case "M":
+						unit = Unit.MB;
+						break;
+					case "G":
+						unit = Unit.GB;
+						break;
+					case "T":
+						unit = Unit.TB;
+						break;
+					case "P":
+						unit = Unit.PB;
+						break;
+					case "E":
+						unit = Unit.EB;
+						break;
+					case "B":
+						unit = Unit.B;
+						break;
+					default:
+						throw new Error("Unknown unit: " + unitStr);
+				}
+			}
+			return IOSize.toBytes(value, unit);
+		}
+		// 尝试解析纯数字（无单位，默认字节）
+		try {
+			const bytes = parseInt(sizeStr.trim());
+			if (bytes < 0) {
+				throw new Error("size cannot be negative: " + bytes);
+			}
+			return bytes;
+		} catch (e) {
+			throw new Error("invalid size format: " + sizeStr);
+		}
+	}
+
+	/**
+	 * 转换值到字节量
+	 *
+	 * @param value 值
+	 * @param unit  单位
+	 * @return 字节量
+	 */
+	private static toBytes(value: number, unit: Unit): number {
+		const units = Object.values(Unit);
+		const ordinal = units.indexOf(unit);
+		return Math.round(value * Math.pow(1024, ordinal));
+	}
 }