Rust Parser [[rust_parser: Parser]]Parser

• languagerust
• sourceqmdc-rs/
• implementsQMD.md Format Specification

Description [[description: text]]text💡

High-performance implementation with LSP server and SQLite integration.

Built on pulldown-cmark for tokenization. Includes a full Language Server Protocol server for IDE integration. Used in the VS Code extension.

Modules:

Module	File	Description
Parser	parser.rs	Core QMD.md → JSON parsing logic
Parser Modules	parser_modules/	Modular parser components (block_tree, header, output, references, utils, value_parser)
Rebuild	rebuild.rs	JSON → QMD.md conversion
Workspace	workspace.rs	Multi-file parsing, recursive search
DB	db/mod.rs	SQLite integration via rusqlite
LSP Server	lsp/server.rs	LSP server (tower-lsp)
LSP Document	lsp/document.rs	Open document management
LSP Commands	lsp/commands.rs	Custom LSP commands
LSP Tree	lsp/tree.rs	Object tree construction
LSP Workspace	lsp/workspace.rs	Workspace for LSP
LSP SQL Rewrite	lsp/sql_rewrite.rs	SQL AST rewrite for workspace isolation
Main	main.rs	CLI entry point
Lib	lib.rs	Public library API

Technologies:

• pulldown-cmark — Markdown tokenization
• serde + serde_json — JSON serialization
• rusqlite — SQLite integration
• tower-lsp — LSP server framework
• tokio — async runtime
• clap — CLI framework
• See full dependency list in qmdc-rs/Cargo.toml

Data flow:

QMD.md
    ↓
pulldown-cmark parser
    ↓
Event stream (Start(Heading), Text, End(Heading), ...)
    ↓
Parser (parser.rs)
    ↓
Object hierarchy (parent-child by heading levels)
    ↓
Field extraction
    ↓
serde_json::Value objects

Installation:

# From source
cd qmdc-rs
cargo build --release
./target/release/qmdc --version

# Via Python package
cd qmdc-rs
make wheel-dev

Performance (MacBook Pro M1):

• Parsing a 1000-line file — ~0.5ms (20x faster than Python)
• Workspace with 100 files — ~50ms (20x faster than Python)
• SQL query against workspace — ~5ms (10x faster than Python)
• LSP completion — <10ms (real-time)

Optimized for production use and real-time IDE editing.

Limitations:

• No lint command (use Python Parser or TypeScript Parser)
• Requires compilation (but available via Python package)

Features [[features: text]]text💡

• parse — QMD.md → JSON conversion
• rebuild — JSON → QMD.md restoration
• workspace — multi-file parsing and validation
• query — SQL queries against workspace via SQLite
• LSP server — completion, hover, go-to-definition, references, diagnostics, rename, document symbols, workspace symbols
• Zero-copy parsing via pulldown-cmark
• Parallel file parsing via rayon
• Parse result caching in LSP
• Cross-platform Python package via cargo-zigbuild