Method build_petgraph_code_graph

rust-core/src/codegraph/parser.rs:754–816

构建基于petgraph的代码图（增量构建）

(&mut self, dir: &Path)

    /// 构建基于petgraph的代码图（增量构建）
    pub fn build_petgraph_code_graph(&mut self, dir: &Path) -> Result<PetCodeGraph, String> {
        // 1. 尝试从本地数据库加载现有的图
        let mut code_graph = self._load_existing_graph(dir)?;
        let has_existing_data = code_graph.is_some();
        
        if let Some(ref mut existing_graph) = code_graph {
            info!("Loaded existing graph with {} functions", existing_graph.get_stats().total_functions);
        } else {
            info!("No existing graph found, starting fresh analysis");
            code_graph = Some(PetCodeGraph::new());
        }
        
        let mut code_graph = code_graph.unwrap();
        
        // 2. 扫描目录下的所有文件
        let files = self.scan_directory(dir);
        info!("Found {} files to process", files.len());
        
        // 3. 加载文件哈希值（如果存在）
        let mut file_hashes = self._load_file_hashes(dir)?;
        
        // 4. 逐个处理文件，检查是否需要重新解析
        let mut processed_files = 0;
        let mut skipped_files = 0;
        
        for file_path in files {
            if self._should_skip_file(&file_path, &mut file_hashes)? {
                skipped_files += 1;
                continue;
            }
            
            if let Err(e) = self.parse_file(&file_path) {
                warn!("Failed to parse {}: {}", file_path.display(), e);
            } else {
                processed_files += 1;
            }
        }
        
        info!("File processing completed: {} processed, {} skipped", processed_files, skipped_files);
        
        // 5. 如果这是增量构建，需要合并新解析的函数
        if has_existing_data {
            self._merge_new_functions(&mut code_graph);
        } else {
            // 全量构建：直接添加所有函数
            for (_file_path, functions) in &self.file_functions {
                for function in functions {
                    code_graph.add_function(function.clone());
                }
            }
        }
        
        // 6. 分析调用关系
        self._analyze_petgraph_call_relations(&mut code_graph);
        
        // 7. 更新统计信息
        code_graph.update_stats();