PolyContract Engine

中文文档 | English

PolyContract Engine is a highly extensible, programmatic, and modular multilingual legal contract rendering engine built natively with LuaLaTeX.

Designed specifically to serve as the document-generation backend for web applications (frontend/backend), it cleanly decouples contract data from presentation. It aims to support infinite contract types (Rental, NDA, Employment) and limitless languages in professional side-by-side or single-column formats.

Features

• JSON Driven Web Architecture: Your APIs simply push a data.json configuration payload. No messy string-templating or RegEx hacking needed; Lua bridges the web data directly into the LaTeX typesetting environment.
• Dynamic Modular Expansion: Built to eventually support hundreds of modular clauses (modules/). The engine executes loader.lua directly via \directlua at compilation to dynamically load, translate, and loop through data objects (e.g., arrays of landlords, tenants, or bespoke clauses).
• Enterprise Internationalization: Backed by polyglossia and paracol, it flawlessly renders complex legal documents in multilingual side-by-side layouts tailored for international agreements.
• Immaculate Zero-Debris Builds: The sophisticated build.sh script parses the JSON payload to dynamically name the output file (e.g., Contract_Taylor_Swift.pdf) and securely sandboxes all intensive LaTeX auxiliary artifacts into a dist/ directory.

Future Roadmap

• Expanded Contract Library: Adding Non-Disclosure Agreements (NDAs), Employment Contracts, and Sales Agreements.
• REST API Wrapper: A lightweight backend (Node/Python) to securely receive JSON, trigger the Makefile, and return the generated PDF stream.
• Full Web Client: A complete React/Vue frontend for users to fill forms explicitly mapping to data.json.

Structure

latex-rental-contract/
├── data.json               # Define language, load clauses, and set contract data
├── Makefile                # make all -> automatically parses tenant name and executes build
├── src/                    
│   ├── main.tex            # Main modular document 
│   ├── loader.lua          # Lua logic converting JSON arrays to robust LaTeX commands
│   ├── styles.sty          # Font encodings, styling, geometries 
│   └── modules/            # Clauses grouped by ISO language codes (cz/en)
└── dist/                   # Holds strictly the final rendered PDF (Gitignored)

Getting Started

Prerequisites

You need a full TeX distribution equipped with LuaLaTeX.

• macOS: brew install --cask mactex or via MacPorts sudo port install texlive-luatex
• Linux: sudo apt install texlive-full

Usage

1. Provide your web client data or manually edit data.json.
2. Open terminal in the project root:

make clean
make all

3. Read the output pdf inside dist/Contract_<TenantName>.pdf!

License

Provided under the MIT License.