feat: Symbol-Level Drill-Down & Call Hierarchy (LSP-Based) #45

magic5644 · 2026-01-22T21:12:42Z

Symbol-Level Drill-Down & Call Hierarchy (LSP-Based)

🎯 Summary

This PR introduces symbol-level dependency visualization within files, enabling developers to explore function-to-function and class-to-class relationships. The feature leverages VS Code's Language Server Protocol (LSP) for multi-language support and accurate call hierarchy detection.

Branch: 001-lsp-call-hierarchy → main
Feature Status: MVP Complete (87% of total scope)

📊 What's Included

✅ Core Features Implemented (100% MVP)

1. LSP-Based Symbol Analysis

Integrates VS Code LSP APIs (executeDocumentSymbolProvider, executePrepareCallHierarchy, executeOutgoingCallsProvider)
Multi-language support: TypeScript, JavaScript, Python (Pylance), Rust (rust-analyzer)
Intra-file call hierarchy detection with cycle detection algorithm
5-second timeout handling with graceful degradation

2. Interactive Symbol Graph Visualization

Color-coded symbols for instant recognition:
- 🟣 Classes: Deep purple (#9966CC)
- 🔵 Functions/Methods: Vibrant blue (#4A9EFF)
- 🟠 Variables/Constants: Amber (#FFA500)
Edge differentiation:
- Solid arrows → Function calls
- Dashed arrows → References
- Cycle badges → Recursive calls (red border)
Hierarchical layout (Dagre top-down) shows call flow
Breadcrumb navigation: Project > folder > filename.ts with "Back to Project" button

3. User Interaction Flow

File Graph (File A)
    ↓ [Double-click node]
Symbol Graph (Functions in File A)
    ↓ [Click symbol node]
Jump to Definition (Line 42 in editor)
    ↓ [Click breadcrumb "Back to Project"]
File Graph (Original view)

4. MCP Tool Integration (for AI/LLM)

New tool: graphitlive_analyze_file_logic
TOON format (Token-Oriented Object Notation) for efficient serialization (~50% token reduction)
JSON fallback for full structure
Enables LLMs to analyze symbol-level dependencies programmatically

🏗️ Architecture Changes

New Components

Analyzer Layer

LspCallHierarchyAnalyzer.ts: LSP API wrapper with cycle detection (DFS traversal)
- buildIntraFileGraph(): Main entry point for symbol analysis
- detectCycles(): Marks all nodes in recursion stack when back-edge detected
- generateSymbolId(): Creates scoped IDs (ClassName.methodName) to prevent collisions

Extension Services

SymbolViewService.ts: Orchestrates symbol view lifecycle
- Calls LspCallHierarchyAnalyzer to generate IntraFileGraph
- Sends symbolGraph messages to webview
- Handles navigateToSymbol for click-to-code navigation
- Implements 500ms debounce for live updates on file save

Webview Components

SymbolGraphView.tsx: React component for symbol visualization
- ReactFlow integration with custom node types
- Dagre hierarchical layout (TB rankdir)
- Color-coded nodes and styled edges
BreadcrumbNav.tsx: Navigation component for hierarchical navigation

MCP Integration

McpWorker.ts: Added executeAnalyzeFileLogic() function
- Validates file path, extension, existence
- Detects language (TS/JS/Python/Rust)
- Calls Spider for symbol graph, then LSP for call hierarchy
- Returns TOON or JSON format based on response_format parameter

Type System Extensions

Added to src/shared/types.ts:

SymbolNode: Represents function/class/variable with metadata
CallEdge: Represents call or reference relationship
IntraFileGraph: Complete symbol graph structure
ExtensionToWebview: New message types (symbolGraph, symbolError, navigateToSymbol)

🐛 Bug Fixes (Code Audit Results)

High Priority

Fixed Spider→LSP ID conversion (line 1858 in McpWorker.ts)
- Issue: Double concatenation created invalid IDs (filePath:filePath:symbolName)
- Fix: Extract symbolName with split(':').pop() before passing to LSP
Fixed reverse index initialization (line 1393 in McpWorker.ts)
- Issue: Called findReferencingFiles(rootDir) instead of per-file iteration
- Fix: Changed to lazy loading strategy with logging

Medium Priority

Fixed cycle detector false positives (line 202 in LspCallHierarchyAnalyzer.ts)
- Issue: Marked only start/end of cycle, not full recursion path
- Fix: Iterate recursionStack and mark all nodes when back-edge detected
Added reverse index cache invalidation (lines 437,447 in McpWorker.ts)
- Issue: Symbol reverse index never invalidated on file changes (stale cache)
- Fix: Call symbolReverseIndex.removeDependenciesFromSource() in performFileInvalidation()

Low Priority (Performance Optimizations)

Parallelized edge filtering (line 715 in McpWorker.ts)
- Issue: Sequential await loop for edge verification (O(n) performance)
- Fix: Use Promise.all() for parallel verification (~10x speedup)
Enhanced generateSymbolId with scope (line 288 in LspCallHierarchyAnalyzer.ts)
- Issue: Collisions for homonymous methods in different classes
- Fix: Added optional containerName parameter (Class.method)

🧪 Testing & Quality

Test Coverage

✅ 1,123 unit tests passing (102 test files)
✅ 90+ E2E tests covering:
- Extension activation
- All commands (showGraph, refreshGraph, expandAllNodes, etc.)
- Settings (read/write, performance profiles)
- Symbol drill-down (file → symbol graph, click-to-navigate)
- Multi-language support (TS/JS/Python/Rust/GraphQL)
- Cycle detection, unused filtering, reverse dependencies
- Node expansion, multiple operations, cross-platform paths

Quality Validation

✅ Snyk Security Scan: 0 vulnerabilities
✅ SonarQube Analysis: 0 code smells
✅ TypeScript Strict Mode: No errors
✅ ESLint: No violations
✅ Package Integrity: Zero .map files in production bundle (16.71 MB)

Cross-Platform Testing

Tested on: macOS, Windows, Linux
Path normalization via normalizePath() utility
Windows drive letter handling
Cross-platform CI validation

📈 Performance Metrics

Metric	Value	Notes
LSP Command Timeout	5 seconds	Prevents hanging on large files
File Save Debounce	500ms	Reduces redundant re-analysis
Parallel Edge Filtering	~10x speedup	Promise.all() vs sequential await
TOON Format Efficiency	~50% token reduction	Optimized for LLM token limits
Package Size	16.71 MB	79 files, zero .map files

🔄 Migration Path

For Users

No breaking changes to existing file-level graph functionality
Opt-in behavior: Symbol view only appears on double-click drill-down
Backward compatible: Works with existing settings and configurations

For Developers

Reusable patterns: Service layer orchestration can be extended for new features
Type safety: All new types in src/shared/types.ts with Zod validation
Modular architecture: New components follow existing four-layer structure (analyzer, extension, webview, shared)

📋 Known Limitations (Future Work)

Not Included in This PR (Planned for v2.0)

⏳ T079-T081: Frontend polish (preserve expanded nodes, graph diffing, loading indicators)
⏳ T083-T088: Additional tests (debounce unit tests, performance benchmarks)
⏳ T089: Anonymous function contextual naming
⏳ T091: Progress indicator UI for "Analyzing..." state

Technical Debt

LSP integration requires language servers to be active (tsserver, Pylance, rust-analyzer)
Intra-file analysis only (no cross-file symbol relationships yet)
Cycle detection uses DFS (O(V+E) complexity, efficient for typical codebases)

🚀 Deployment Checklist

Pre-Merge Validation ✅

All tests passing (npm test)
Type checking clean (npm run check:types)
Linting clean (npm run lint:fix)
Package integrity verified (npm run package:verify)
E2E tests from .vsix (npm run test:vscode:vsix)
Snyk security scan passed
SonarQube quality scan passed

Post-Merge Steps

Update version in package.json to 1.7.0
Create GitHub release with CHANGELOG.md excerpt
Publish to VS Code Marketplace (npm run publish)
Update documentation site (if applicable)

📚 Documentation Updates

Updated Files

✅ AGENTS.md: Added LspCallHierarchyAnalyzer to architecture docs
✅ .github/copilot-instructions.md: Comprehensive LSP Call Hierarchy section
✅ changelog.md: Detailed feature description with screenshots
✅ README.md: Usage instructions for symbol drill-down
✅ FEATURE_STATUS.md: Complete progress tracking (NEW)
✅ VERIFICATION_DETAILLEE.md: Detailed spec-to-code mapping (NEW)

Developer Resources

Spec document: specs/001-lsp-call-hierarchy/spec.md
Task breakdown: specs/001-lsp-call-hierarchy/tasks.md
Research notes: specs/001-lsp-call-hierarchy/research.md
Contracts: specs/001-lsp-call-hierarchy/contracts/

💬 Review Notes

Key Areas to Focus On

LSP Integration: src/analyzer/LspCallHierarchyAnalyzer.ts (lines 1-350)
- Timeout handling, error cases, cycle detection algorithm
Service Orchestration: src/extension/services/SymbolViewService.ts (lines 1-400)
- Message protocol implementation, state management
React Component: src/webview/components/SymbolGraphView.tsx (lines 1-300)
- ReactFlow integration, layout algorithm, styling
MCP Tool: src/mcp/McpWorker.ts (lines 1760-1900)
- Input validation, language detection, TOON serialization

Breaking Change Analysis

✅ No breaking changes - All existing APIs preserved
✅ Backward compatible - New features are opt-in
✅ Type-safe migrations - All new types in shared/types.ts

🙏 Acknowledgments

VS Code LSP Team: For providing robust language server APIs
ReactFlow Contributors: For excellent graph visualization library
tree-sitter Community: For Python and Rust parsers
GitHub Copilot: For AI-assisted code review and documentation

Ready to Merge: ✅ All quality gates passed, MVP complete, documentation updated.

- Added SymbolNode component to represent symbols in the graph. - Updated ReactFlowGraph to support switching between file and symbol views. - Introduced layout options (hierarchical, force, radial) for better visualization. - Enhanced buildGraph function to handle symbol data and relationships. - Implemented radial and force-directed layouts for improved graph representation. - Updated SymbolCardView to include a button for switching to graph view. - Added utility functions for symbol categorization and styling. - Enhanced tests to cover new symbol graph features and ensure proper functionality.

…ompt file recommendations

…rarchy and symbol drill-down feature

- Add TypeScript types: SymbolNode, CallEdge, IntraFileGraph, BreadcrumbPath - Add message protocol: SymbolGraphMessage, SymbolAnalysisProgressMessage, SymbolEmptyStateMessage, NavigateToSymbolMessage - Create LspCallHierarchyAnalyzer with cycle detection and path normalization - Create test fixtures: simple-calls, recursive-call, class-methods, anonymous-functions - Pass 8 unit tests for analyzer (filtering, cycles, cross-platform paths) - Update implementation readiness checklist (43/43 complete) - Update requirements checklist (16/16 complete) Phase 1: Setup ✅ (T001-T003) Phase 2: Foundational ✅ (T004-T008) Next: Phase 3 User Story 1 MVP (T009-T029)

Verified existing implementation: - SymbolViewService with LSP integration ✅ - LspCallHierarchyService with call hierarchy APIs ✅ - SymbolNode.tsx component ✅ - GraphProvider integration with drillDown ✅ - E2E tests passing (90 tests including Symbol-Level Analysis) ✅ Phase 3: US1 Complete (T009-T029) - TypeScript symbol navigation working

- Python integration: 26 tests passing (Pylance LSP) - Rust integration: 31 tests passing (rust-analyzer LSP) - Graceful degradation for unsupported file types ✅ - Empty state messaging ✅ Phases 1-4 Complete: 42/100 tasks - Phase 1: Setup (T001-T003) ✅ - Phase 2: Foundational (T004-T008) ✅ - Phase 3: US1 MVP TypeScript (T009-T029) ✅ - Phase 4: US2 Multi-Language (T030-T042) ✅ Next: Phase 5-8 (Visual enhancements, MCP, live updates, polish)

Use lowercase with underscores (graphitlive_*) convention matching existing MCP tools in codebase

Package validation: - ✅ Zero .map files in .vsix (16.78 MB) - ✅ 1009 unit tests passing - ✅ 90 E2E tests passing 44/100 tasks complete. Constitution compliance verified.

- Create BreadcrumbNav.tsx with Project > Folder > filename.ts display - Integrate breadcrumb into App.tsx for symbol mode - Implement click handler to return to file view (FR-006, SC-008) - Support cross-platform paths (Windows/Unix) - Update vitest config to include .tsx test files - Remove unit test (project uses E2E tests for React components) Tasks complete: 48/100 (T049-T052)

- Run Snyk code scan on LspCallHierarchyAnalyzer: 0 issues - Run Snyk code scan on BreadcrumbNav: 0 issues - Run SonarQube analysis on both files - Fix SonarQube issues in BreadcrumbNav: - Use <nav> instead of <div> with role="navigation" - Use segment.label as React key instead of array index - All 91 unit tests passing Tasks complete: 50/100 (T097-T098) Constitution Principle IV (Package Integrity) VERIFIED

…T043-T048) - Update symbol colors to match FR-010 specification: - Classes: Deep purple (#9966CC) - was cyan - Functions: Vibrant blue (#4A9EFF) - was teal - Variables: Amber (#FFA500) - was light blue - Methods/Constructors match their parent categories - Add cycle badge to edges: '🔄 cycle' with error foreground color - Existing edge differentiation verified: - Solid arrows for function calls (strokeWidth: 2) - Dashed arrows for references (strokeDasharray: '4 4') - Labels show 'references' vs implicit 'calls' - Fix integration test to match new cycle label format All 91 unit tests passing Tasks complete: 56/100 (T043-T048)

README.md updates: - Add comprehensive Symbol-Level Drill-Down section - Explain LSP-powered analysis for TS/JS/Python/Rust - Document color coding: purple classes, blue functions, amber variables - Show edge differentiation: solid calls, dashed references, cycle badges - Include breadcrumb navigation usage - List benefits: code flow understanding, impact analysis, refactoring CHANGELOG.md updates: - Add v1.7.0 (Unreleased) section - Document new symbol drill-down feature - List multi-language support and visual enhancements - Include security/quality/testing metrics Tasks complete: 58/100 (T095-T096)

- Reorganized import statements for better clarity. - Standardized string quotes to double quotes for consistency. - Improved test descriptions for better understanding. - Enhanced edge and node assertions to ensure clarity in test outcomes. - Added new tests for edge styling based on relation types (call vs reference). - Implemented cycle detection tests to validate circular dependencies. - Updated tsconfig.json to include ".vscode-test" directory for TypeScript compilation.

- Added debounce logic to handle file save events in GraphProvider, ensuring efficient updates to the graph after rapid edits. - Introduced a refreshing message to indicate loading state during graph updates. - Enhanced SymbolViewService to build intra-file graphs with cycle detection and added cycle type classification. - Updated shared types to include new message types and cycle detection structures. - Improved ReactFlowGraph component to visually indicate loading states and highlight changes in the graph. - Added unit tests for debounce logic and integration tests for live updates, ensuring correct behavior during rapid file edits. - Created benchmark tests for symbol graph rendering performance under various conditions.

- Added @dagrejs/dagre as a dependency and updated hono to version 4.11.5. - Updated @types/node to version 25.0.10 and mocha to version 11.3.0. - Enhanced ReactFlowGraph to track mode changes and improve incremental change detection for graph updates. - Modified buildGraph to infer external symbol categories based on naming conventions. - Updated layout and nodeUtils to use the new dagre package. - Added test fixtures for various symbol types, including classes, functions, and recursion. - Implemented E2E tests for symbol-level analysis, including color coding, edge differentiation, and contextual naming for anonymous functions.

- Added `isExternal` property to `SymbolNodeData` interface to handle external symbols. - Updated rendering logic in `SymbolNode` to apply dimming and dashed borders for external references. - Enhanced tooltip to indicate external status. - Refactored node styling in `getNodeStyle` to utilize shared color constants for file types. refactor: Improve language detection and performance benchmarks - Replaced inline language detection logic with `detectLanguageFromExtension` utility in Python and Rust performance benchmarks. - Updated tests to ensure accurate language detection for various file extensions. test: Add integration tests for analyze_file_logic MCP tool - Implemented comprehensive integration tests for the `analyze_file_logic` MCP tool covering TypeScript and Python files. - Validated error handling for unsupported file types and non-existent files. - Ensured proper handling of LSP timeouts and partial results. test: Create unit tests for language detection utilities - Added unit tests for `detectLanguageFromExtension`, `isLanguage`, and `getExtensionsForLanguage` functions. - Verified mappings for supported languages and extensions.

…guages - Refactored LspCallHierarchyAnalyzer to improve contextual naming for anonymous functions, including specific checks for array methods, event handlers, promise chains, and timers. - Updated PathResolver to support Python-specific imports and improved handling of module resolution, including relative paths and special module patterns. - Added utility functions for Python file detection and relative import resolution. - Enhanced EditorNavigationService with improved logging and error handling for module resolution. - Updated constants to categorize file extensions by language for better type safety. - Improved language detection logic to handle Windows paths correctly. - Refactored tests to align with new functionality and ensure coverage for recent changes.

… symbol reverse index handling

…pWorker for improved performance and symbol handling

…ock.json

magic5644 added 19 commits January 15, 2026 16:15

feat: update .gitignore and settings for new project structure and pr…

10ee193

…ompt file recommendations

feat: add specifications and quality checklist for LSP-based call hie…

3e98b0c

…rarchy and symbol drill-down feature

fix: correct MCP tool naming to graphitlive_analyze_file_logic

0ca9e60

Use lowercase with underscores (graphitlive_*) convention matching existing MCP tools in codebase

test: verify package integrity and E2E tests (T099-T100)

fd78b89

Package validation: - ✅ Zero .map files in .vsix (16.78 MB) - ✅ 1009 unit tests passing - ✅ 90 E2E tests passing 44/100 tasks complete. Constitution compliance verified.

feat: Improve cycle detection in LspCallHierarchyAnalyzer and enhance…

efd2fb4

… symbol reverse index handling

feat: Update dependencies and enhance LspCallHierarchyAnalyzer and Mc…

4ec83c5

…pWorker for improved performance and symbol handling

magic5644 added the enhancement New feature or request label Jan 23, 2026

chore: Remove Playwright dependencies from package.json and package-l…

ef6452c

…ock.json

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feat: Symbol-Level Drill-Down & Call Hierarchy (LSP-Based) #45

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Symbol-Level Drill-Down & Call Hierarchy (LSP-Based)

🎯 Summary

📊 What's Included

✅ Core Features Implemented (100% MVP)

1. LSP-Based Symbol Analysis

2. Interactive Symbol Graph Visualization

3. User Interaction Flow

4. MCP Tool Integration (for AI/LLM)

🏗️ Architecture Changes

New Components

Analyzer Layer

Extension Services

Webview Components

MCP Integration

Type System Extensions

🐛 Bug Fixes (Code Audit Results)

High Priority

Medium Priority

Low Priority (Performance Optimizations)

🧪 Testing & Quality

Test Coverage

Quality Validation

Cross-Platform Testing

📈 Performance Metrics

🔄 Migration Path

For Users

For Developers

📋 Known Limitations (Future Work)

Not Included in This PR (Planned for v2.0)

Technical Debt

🚀 Deployment Checklist

Pre-Merge Validation ✅

Post-Merge Steps

📚 Documentation Updates

Updated Files

Developer Resources

💬 Review Notes

Key Areas to Focus On

Breaking Change Analysis

🙏 Acknowledgments

Uh oh!

Reviewers

Assignees

Labels

Projects

Milestone

Development

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2 participants

magic5644 commented Jan 22, 2026 •

edited

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