chore: 添加 vcdParser.ts (未使用，保留备用)

纯 TypeScript 实现的 VCD 解析器，当前未使用。
目前使用 waveformTracer.ts 调用 Python 打包的 exe。

src/utils/vcdParser.ts

@@ -0,0 +1,467 @@
+/**
+ * VCD (Value Change Dump) 解析器
+ * 纯 TypeScript 实现，参照 VerilogCoder 项目格式
+ *
+ * @deprecated 当前未使用，保留备用
+ * 目前使用 waveformTracer.ts 调用 Python 打包的 waveform_trace.exe
+ * 未来可能用此文件替换 Python 实现
+ */
+import * as fs from 'fs';
+import * as path from 'path';
+
+// ==================== 类型定义 ====================
+
+/** 信号定义 */
+export interface VcdSignal {
+  name: string;           // 完整路径名，如 "tb.top_module.data"
+  shortName: string;      // 短名，如 "data"
+  symbolId: string;       // VCD 符号 ID，如 "!", "#"
+  width: number;          // 位宽
+  varType: string;        // 变量类型：wire, reg
+  module: string;         // 所属模块
+}
+
+/** 时间-值对 */
+export interface TimeValue {
+  time: number;
+  value: string;
+}
+
+/** 信号波形数据 */
+export interface SignalWaveform {
+  signal: VcdSignal;
+  changes: TimeValue[];
+}
+
+/** VCD 解析结果 */
+export interface VcdData {
+  date?: string;
+  version?: string;
+  timescale: string;
+  endTime: number;
+  signals: Map<string, VcdSignal>;      // symbolId -> signal
+  waveforms: Map<string, TimeValue[]>;  // symbolId -> changes
+}
+
+/** Mismatch 信息 */
+export interface MismatchInfo {
+  time: number;
+  signal: string;
+  dutValue: string;
+  refValue: string;
+}
+
+// ==================== VCD 解析器 ====================
+
+export class VcdParser {
+  private signals: Map<string, VcdSignal> = new Map();
+  private waveforms: Map<string, TimeValue[]> = new Map();
+  private scopeStack: string[] = [];
+  private timescale: string = '1ns';
+  private currentTime: number = 0;
+  private endTime: number = 0;
+  private date?: string;
+  private version?: string;
+
+  /**
+   * 解析 VCD 文件
+   */
+  parse(filePath: string): VcdData {
+    const content = fs.readFileSync(filePath, 'utf-8');
+    return this.parseContent(content);
+  }
+
+  /**
+   * 解析 VCD 内容
+   */
+  parseContent(content: string): VcdData {
+    // 预处理：将多行指令合并成单行
+    const normalizedContent = this.normalizeVcdContent(content);
+    const lines = normalizedContent.split('\n');
+    let inDefinitions = true;
+
+    for (const rawLine of lines) {
+      const line = rawLine.trim();
+      if (!line) continue;
+
+      if (inDefinitions) {
+        // 解析定义区
+        if (line.startsWith('$enddefinitions')) {
+          inDefinitions = false;
+          continue;
+        }
+        this.parseDefinition(line);
+      } else {
+        // 解析数据区
+        this.parseValueChange(line);
+      }
+    }
+
+    return {
+      date: this.date,
+      version: this.version,
+      timescale: this.timescale,
+      endTime: this.endTime,
+      signals: this.signals,
+      waveforms: this.waveforms
+    };
+  }
+
+  private parseDefinition(line: string): void {
+    if (line.startsWith('$date')) {
+      this.date = this.extractValue(line);
+    } else if (line.startsWith('$version')) {
+      this.version = this.extractValue(line);
+    } else if (line.startsWith('$timescale')) {
+      this.timescale = this.extractValue(line) || '1ns';
+    } else if (line.startsWith('$scope')) {
+      const match = line.match(/\$scope\s+\w+\s+(\S+)/);
+      if (match) {
+        this.scopeStack.push(match[1]);
+      }
+    } else if (line.startsWith('$upscope')) {
+      this.scopeStack.pop();
+    } else if (line.startsWith('$var')) {
+      this.parseVariable(line);
+    }
+  }
+
+  private parseVariable(line: string): void {
+    // $var wire 8 # data [7:0] $end
+    // $var reg 1 ! clk $end
+    const match = line.match(/\$var\s+(\w+)\s+(\d+)\s+(\S+)\s+(\S+)/);
+    if (!match) return;
+
+    const [, varType, widthStr, symbolId, name] = match;
+    const width = parseInt(widthStr, 10);
+    const module = this.scopeStack.join('.');
+    const fullName = module ? `${module}.${name}` : name;
+
+    const signal: VcdSignal = {
+      name: fullName,
+      shortName: name.replace(/\[\d+:\d+\]/, ''),  // 移除位宽标注
+      symbolId,
+      width,
+      varType,
+      module
+    };
+
+    this.signals.set(symbolId, signal);
+    this.waveforms.set(symbolId, []);
+  }
+
+  private parseValueChange(line: string): void {
+    if (line.startsWith('#')) {
+      // 时间戳: #100
+      this.currentTime = parseInt(line.substring(1), 10);
+      this.endTime = Math.max(this.endTime, this.currentTime);
+    } else if (line.startsWith('b') || line.startsWith('B')) {
+      // 多位值: b10101010 #
+      const spaceIdx = line.indexOf(' ');
+      if (spaceIdx > 0) {
+        const value = line.substring(1, spaceIdx);
+        const symbolId = line.substring(spaceIdx + 1).trim();
+        this.addChange(symbolId, value);
+      }
+    } else if (line.length >= 2 && !line.startsWith('$')) {
+      // 单位值: 0! 或 1# 或 x$
+      const value = line[0];
+      const symbolId = line.substring(1).trim();
+      if (symbolId && this.signals.has(symbolId)) {
+        this.addChange(symbolId, value);
+      }
+    }
+  }
+
+  private addChange(symbolId: string, value: string): void {
+    const changes = this.waveforms.get(symbolId);
+    if (changes) {
+      changes.push({ time: this.currentTime, value });
+    }
+  }
+
+  private extractValue(line: string): string {
+    // 提取 $xxx value $end 中的 value
+    const match = line.match(/\$\w+\s+(.+?)\s*\$end/);
+    return match ? match[1].trim() : '';
+  }
+
+  /**
+   * 预处理 VCD 内容，将多行指令合并成单行
+   */
+  private normalizeVcdContent(content: string): string {
+    // 将多行 $xxx ... $end 合并成单行
+    return content.replace(/(\$\w+)\s*\n\s*([^\$]+?)\s*\n\s*(\$end)/g, '$1 $2 $3');
+  }
+}
+
+// ==================== 波形分析工具 ====================
+
+/**
+ * 二进制字符串转十六进制
+ */
+export function binaryToHex(binary: string): string {
+  if (binary === 'x' || binary === 'X' || binary.includes('x')) {
+    return 'xx';
+  }
+  if (binary === 'z' || binary === 'Z' || binary.includes('z')) {
+    return 'zz';
+  }
+  if (binary.length <= 1) {
+    return binary;
+  }
+  // 补齐到 4 的倍数
+  const padded = binary.padStart(Math.ceil(binary.length / 4) * 4, '0');
+  let hex = '';
+  for (let i = 0; i < padded.length; i += 4) {
+    hex += parseInt(padded.substring(i, i + 4), 2).toString(16);
+  }
+  return hex;
+}
+
+/**
+ * 获取信号在指定时间的值
+ */
+export function getValueAtTime(
+  changes: TimeValue[],
+  time: number
+): string {
+  let value = 'x';
+  for (const change of changes) {
+    if (change.time <= time) {
+      value = change.value;
+    } else {
+      break;
+    }
+  }
+  return value;
+}
+
+/**
+ * 查找 DUT 和 REF 信号的第一个 mismatch
+ */
+export function findFirstMismatch(
+  vcdData: VcdData,
+  dutSignals: string[],
+  refSignals: string[]
+): MismatchInfo | null {
+  // 收集所有时间点
+  const allTimes = new Set<number>();
+  for (const changes of vcdData.waveforms.values()) {
+    for (const c of changes) {
+      allTimes.add(c.time);
+    }
+  }
+  const sortedTimes = Array.from(allTimes).sort((a, b) => a - b);
+
+  // 按信号名匹配 DUT 和 REF
+  for (const time of sortedTimes) {
+    for (let i = 0; i < dutSignals.length; i++) {
+      const dutSig = findSignalByName(vcdData, dutSignals[i]);
+      const refSig = findSignalByName(vcdData, refSignals[i]);
+
+      if (!dutSig || !refSig) continue;
+
+      const dutChanges = vcdData.waveforms.get(dutSig.symbolId) || [];
+      const refChanges = vcdData.waveforms.get(refSig.symbolId) || [];
+
+      const dutVal = getValueAtTime(dutChanges, time);
+      const refVal = getValueAtTime(refChanges, time);
+
+      // 跳过未知值
+      if (dutVal.includes('x') || refVal.includes('x')) continue;
+
+      if (dutVal !== refVal) {
+        return {
+          time,
+          signal: dutSig.shortName,
+          dutValue: binaryToHex(dutVal),
+          refValue: binaryToHex(refVal)
+        };
+      }
+    }
+  }
+  return null;
+}
+
+/**
+ * 按名称查找信号
+ */
+function findSignalByName(vcdData: VcdData, name: string): VcdSignal | null {
+  for (const signal of vcdData.signals.values()) {
+    if (signal.name.endsWith(name) || signal.shortName === name) {
+      return signal;
+    }
+  }
+  return null;
+}
+
+/**
+ * 生成波形表格（参照 VerilogCoder 格式）
+ */
+export function generateWaveformTable(
+  vcdData: VcdData,
+  signalNames: string[],
+  startTime: number = 0,
+  endTime?: number,
+  windowSize: number = 20
+): string {
+  const actualEndTime = endTime ?? vcdData.endTime;
+
+  // 查找信号
+  const signals: VcdSignal[] = [];
+  for (const name of signalNames) {
+    const sig = findSignalByName(vcdData, name);
+    if (sig) signals.push(sig);
+  }
+
+  if (signals.length === 0) {
+    return '未找到指定信号';
+  }
+
+  // 收集时间点
+  const times = new Set<number>();
+  for (const sig of signals) {
+    const changes = vcdData.waveforms.get(sig.symbolId) || [];
+    for (const c of changes) {
+      if (c.time >= startTime && c.time <= actualEndTime) {
+        times.add(c.time);
+      }
+    }
+  }
+
+  let sortedTimes = Array.from(times).sort((a, b) => a - b);
+  if (sortedTimes.length > windowSize) {
+    sortedTimes = sortedTimes.slice(0, windowSize);
+  }
+
+  // 生成表头
+  const headers = ['time(ns)', ...signals.map(s => s.shortName)];
+  const colWidths = headers.map(h => Math.max(h.length, 8));
+
+  let table = '### Waveform Trace ###\n';
+  table += headers.map((h, i) => h.padEnd(colWidths[i])).join('  ') + '\n';
+  table += colWidths.map(w => '─'.repeat(w)).join('──') + '\n';
+
+  // 生成数据行
+  for (const time of sortedTimes) {
+    const row = [time.toString()];
+    for (const sig of signals) {
+      const changes = vcdData.waveforms.get(sig.symbolId) || [];
+      const val = getValueAtTime(changes, time);
+      row.push(binaryToHex(val));
+    }
+    table += row.map((v, i) => v.padEnd(colWidths[i])).join('  ') + '\n';
+  }
+
+  table += '### Waveform Trace End ###\n';
+  return table;
+}
+
+/**
+ * 获取信号显示名称（模块.信号名[位宽]）
+ */
+function getSignalDisplayName(sig: VcdSignal): string {
+  const moduleParts = sig.module.split('.');
+  const moduleShort = moduleParts[moduleParts.length - 1] || '';
+  const bitInfo = sig.width > 1 ? `[${sig.width - 1}:0]` : '';
+  return moduleShort ? `${moduleShort}.${sig.shortName}${bitInfo}` : `${sig.shortName}${bitInfo}`;
+}
+
+/**
+ * 生成变化日志格式（只记录信号变化）
+ */
+export function generateChangeLog(vcdData: VcdData): string {
+  // 筛选信号（排除 parameter）
+  const signals: VcdSignal[] = [];
+  for (const sig of vcdData.signals.values()) {
+    if (sig.varType !== 'parameter') {
+      signals.push(sig);
+    }
+  }
+
+  // 收集所有时间点
+  const times = new Set<number>();
+  for (const sig of signals) {
+    const changes = vcdData.waveforms.get(sig.symbolId) || [];
+    for (const c of changes) {
+      times.add(c.time);
+    }
+  }
+  const sortedTimes = Array.from(times).sort((a, b) => a - b);
+
+  // 记录每个信号的上一个值
+  const lastValues = new Map<string, string | null>();
+  for (const sig of signals) {
+    lastValues.set(sig.symbolId, null);
+  }
+
+  let log = '';
+
+  for (const time of sortedTimes) {
+    const changes: string[] = [];
+
+    for (const sig of signals) {
+      const waveform = vcdData.waveforms.get(sig.symbolId) || [];
+      const currentVal = binaryToHex(getValueAtTime(waveform, time));
+      const lastVal = lastValues.get(sig.symbolId);
+
+      if (lastVal === null) {
+        changes.push(`${getSignalDisplayName(sig)}=${currentVal}`);
+      } else if (currentVal !== lastVal) {
+        changes.push(`${getSignalDisplayName(sig)} ${lastVal}→${currentVal}`);
+      }
+
+      lastValues.set(sig.symbolId, currentVal);
+    }
+
+    if (changes.length > 0) {
+      log += `#${time}: ${changes.join(', ')}\n`;
+    }
+  }
+
+  return log;
+}
+
+/**
+ * 分析 VCD 文件（主入口）
+ */
+export function analyzeVcdFile(
+  filePath: string,
+  signalFilter?: string,
+  checkpoint?: number
+): string {
+  // 解析 VCD
+  const parser = new VcdParser();
+  const vcdData = parser.parse(filePath);
+
+  // 解析信号过滤器
+  const signalNames = signalFilter
+    ? signalFilter.split(',').map(s => s.trim())
+    : Array.from(vcdData.signals.values()).map(s => s.shortName);
+
+  // 生成摘要
+  let result = `=== VCD 波形分析 ===\n`;
+  result += `文件: ${path.basename(filePath)}\n`;
+  result += `时间单位: ${vcdData.timescale}\n`;
+  result += `仿真时长: 0 - ${vcdData.endTime}${vcdData.timescale}\n\n`;
+
+  // 信号列表
+  result += `--- 信号列表 (${vcdData.signals.size} 个) ---\n`;
+  let idx = 1;
+  for (const sig of vcdData.signals.values()) {
+    if (idx <= 10) {
+      result += `${idx}. ${sig.shortName} (${sig.width}-bit, ${sig.varType})\n`;
+    }
+    idx++;
+  }
+  if (vcdData.signals.size > 10) {
+    result += `... 还有 ${vcdData.signals.size - 10} 个信号\n`;
+  }
+  result += '\n';
+
+  // 变化日志
+  result += generateChangeLog(vcdData);
+
+  return result;
+}