xycutppy 0.1.1

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XYCut++ Python Wrapper (xycutppy)

This project provides a Python wrapper with two reading backends: paper (original GPL core) and datalab (native Rust port of Datalab's Apache-2.0 module). The wrapper lets you choose the backend at runtime.

✨ Features

• High performance: The algorithm core is implemented in Rust for maximum efficiency.
• Pythonic API: A clean, well-documented Python layer wrapping the Rust logic.
• Configurable: Tune XYCut parameters through a dedicated configuration class.
• Type-safe labels: Uses enums for semantic labels to avoid string-based errors.
• Easy build and distribution: Uses maturin for seamless Rust/Python integration.
• Backend selection: Choose paper or datalab per call or as a global default.
• Multi-license structure: Code is split by module to simplify license compliance.

⚖️ Module licensing (Dual License)

This repository uses:

Apache-2.0 OR GPL-3.0-or-later

How this applies in practice:

• Root pip package (xycutppy): distributed under Apache-2.0.
• xycutppy-paper backend/package (code in src/paper/xycut_plus_plus): distributed under GPL-3.0-or-later.

Reference files:

• LICENSE (root): formal dual-license declaration (Apache-2.0 OR GPL-3.0-or-later).
• src/datalab/xycut_plus_plus_sorter/LICENSE: Apache-2.0 text.
• src/paper/xycut_plus_plus/LICENSE: GPL-3.0 text.

📦 Installation

Once published to PyPI, the package can be installed with pip:

pip install xycutppy

🚀 Quickstart

Below is a basic example showing how to use the package to determine the reading order of a set of elements.

from xycutppy import compute_order, SemanticLabel, XYCutConfig, set_backend

# 1. Define the elements to sort.
# Each element is a dictionary with id, coordinates (x1, y1, x2, y2), and a label.
elements = [
    {'id': 0, 'x1': 10.0, 'y1': 10.0, 'x2': 200.0, 'y2': 30.0, 'label': SemanticLabel.HorizontalTitle},
    {'id': 1, 'x1': 10.0, 'y1': 50.0, 'x2': 400.0, 'y2': 100.0, 'label': SemanticLabel.Regular},
    {'id': 2, 'x1': 450.0, 'y1': 50.0, 'x2': 600.0, 'y2': 100.0, 'label': SemanticLabel.Regular},
    {'id': 3, 'x1': 10.0, 'y1': 120.0, 'x2': 600.0, 'y2': 200.0, 'label': SemanticLabel.Regular},
]

# 2. Define page bounds (x_min, y_min, x_max, y_max)
page_bounds = (0.0, 0.0, 800.0, 1200.0)

# 3. (Optional) Customize algorithm configuration.
custom_config = XYCutConfig(
    min_cut_threshold=10.0,
    same_row_tolerance=5.0
)

# 4. Global backend selection (optional).
set_backend("paper")  # or "datalab"

# 5. Compute reading order.
# If `config` is not passed, defaults are used.
ordered_ids = compute_order(elements, page_bounds, config=custom_config)

# 6. Or explicit per-call backend selection.
ordered_ids_datalab = compute_order(elements, page_bounds, backend="datalab")

print(f"Reading order IDs: {ordered_ids}")
# Expected output: Reading order IDs:

🧪 Visual scenarios tests (tests/scenarios.py)

Run the visual scenario suite to generate annotated PNG outputs for every available backend:

cd tests
python scenarios.py

Generated images are saved in:

tests/output_examples/

For a gallery with all example outputs rendered inline, see:

• tests/README.md

---

🛠️ Developer Guide: Build the Wheel from Source

This section describes how to compile the Python package (.whl) from source code.

Prerequisites

Make sure you have the following installed:

1. Python (version 3.8+).
2. Rust: Rust toolchain (including rustc and cargo). Install from rustup.rs.
3. Maturin: Tool to build and publish Rust-based Python packages.

   pip install maturin
   

Project structure

The project follows a backend/license-separated structure:

xycut_project/
├── pyproject.toml      # Project and maturin configuration
├── README.md
├── Cargo.toml
├── LICENSE             # Dual-license declaration: Apache-2.0 OR GPL-3.0-or-later
├── src/
│   ├── lib.rs          # Native Python module (PyO3)
│   ├── paper/xycut_plus_plus/  # GPL Rust core
│   └── datalab/
│       ├── LICENSE     # Apache-2.0
│       └── java/       # Original Java source kept as reference/license
└── xycutppy/           # Python package source code
    └── __init__.py

Steps to generate the wheel

1. Clone the repository (if applicable) and move to the project root (xycut_project/).

2. Create and activate a virtual environment (recommended):

   python -m venv venv
   source venv/bin/activate  # Linux/macOS
   # venv\Scripts\activate   # Windows
   

3. Build the project and generate the wheel: Run the following maturin command from the project root. It compiles the Rust crate in release mode and packages it with the Python wrapper into a .whl file.

   maturin build --release
   

   The generated wheel is stored in target/wheels/.

   Tip: During development, you can run maturin develop to build and install into the active virtual environment. It is faster because it skips packaging and lets you test changes immediately.

4. Install the wheel locally for testing: Install the .whl you just created with pip:

   # Exact filename may vary by OS and Python version
   pip install target/wheels/xycutppy-0.0.2-*.whl
   

That's it. You now have a locally installed Python package ready for testing or distribution.