89 lines
2.4 KiB
TypeScript
89 lines
2.4 KiB
TypeScript
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/**
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* 解析整数范围字符串
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* @param label 标签字符串，可能是单个整数（如 "1"）或整数范围（如 "1-3"）
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* @returns 如果成功解析返回 [min, max]，否则返回 null
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*/
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export function parseIntegerRange(label: string): [number, number] | null {
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const trimmed = label.trim();
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// 尝试匹配整数范围格式 (如 "1-3")
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const rangeMatch = trimmed.match(/^(\d+)\s*-\s*(\d+)$/);
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if (rangeMatch) {
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const min = parseInt(rangeMatch[1]!, 10);
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const max = parseInt(rangeMatch[2]!, 10);
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if (min <= max) {
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return [min, max];
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}
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}
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// 尝试匹配单个整数格式 (如 "5")
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const intMatch = trimmed.match(/^(\d+)$/);
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if (intMatch) {
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const num = parseInt(intMatch[1]!, 10);
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return [num, num];
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}
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return null;
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}
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/**
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* 计算加权随机的总权重
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* @param labels 标签数组
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* @returns 总权重值
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*/
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export function calculateTotalWeight(labels: string[]): number {
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let total = 0;
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for (const label of labels) {
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const range = parseIntegerRange(label);
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if (range) {
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const [min, max] = range;
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total += max - min + 1;
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}
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}
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return total;
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}
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/**
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* 根据权重随机选择一个索引
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* @param labels 标签数组
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* @param totalWeight 总权重（可选，会自行计算）
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* @returns 选中的索引，如果没有有效权重则返回 -1
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*/
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export function weightedRandomIndex(labels: string[], totalWeight?: number): number {
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const weight = totalWeight ?? calculateTotalWeight(labels);
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if (weight === 0) {
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return -1;
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}
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// 生成一个随机权重值 (1 到 totalWeight)
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const roll = Math.floor(Math.random() * weight) + 1;
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let cumulative = 0;
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for (let i = 0; i < labels.length; i++) {
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const range = parseIntegerRange(labels[i]!);
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if (range) {
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const [min, max] = range;
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const labelWeight = max - min + 1;
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cumulative += labelWeight;
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if (roll <= cumulative) {
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return i;
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}
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}
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}
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// 理论上不会到这里，但为了安全返回最后一个
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return labels.length - 1;
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}
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/**
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* 检查所有 label 是否都是整数或整数范围格式
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* @param labels 标签数组
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* @returns 如果所有 label 都是整数/整数范围格式返回 true
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*/
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export function areAllLabelsNumeric(labels: string[]): boolean {
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if (labels.length === 0) return false;
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return labels.every(label => parseIntegerRange(label) !== null);
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}
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