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A simple xml parser.
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‎.github/workflows/CI.yml‎

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name: CI
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on:
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push:
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branches:
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- main
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- master
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pull_request:
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jobs:
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linux:
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runs-on: ubuntu-latest
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steps:
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- uses: actions/checkout@v3
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- uses: messense/maturin-action@v1
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with:
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manylinux: auto
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command: build
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args: --release --sdist -o dist --find-interpreter
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- name: Upload wheels
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uses: actions/upload-artifact@v2
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with:
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name: wheels
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path: dist
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windows:
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runs-on: windows-latest
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steps:
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- uses: actions/checkout@v3
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- uses: messense/maturin-action@v1
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with:
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command: build
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args: --release -o dist --find-interpreter
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- name: Upload wheels
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uses: actions/upload-artifact@v2
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with:
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name: wheels
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path: dist
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macos:
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runs-on: macos-latest
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steps:
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- uses: actions/checkout@v3
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- uses: messense/maturin-action@v1
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with:
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command: build
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args: --release -o dist --universal2 --find-interpreter
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- name: Upload wheels
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uses: actions/upload-artifact@v2
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with:
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name: wheels
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path: dist
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release:
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name: Release
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runs-on: ubuntu-latest
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if: "startsWith(github.ref, 'refs/tags/')"
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needs: [ macos, windows, linux ]
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steps:
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- uses: actions/download-artifact@v2
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with:
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name: wheels
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- name: Publish to PyPI
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uses: messense/maturin-action@v1
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env:
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MATURIN_PYPI_TOKEN: ${{ secrets.PYPI_API_TOKEN }}
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with:
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command: upload
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args: --skip-existing *

‎.gitignore‎

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# Generated by Cargo
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# will have compiled files and executables
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debug/
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target/
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# Remove Cargo.lock from gitignore if creating an executable, leave it for libraries
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# More information here https://doc.rust-lang.org/cargo/guide/cargo-toml-vs-cargo-lock.html
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Cargo.lock
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# These are backup files generated by rustfmt
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**/*.rs.bk
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# MSVC Windows builds of rustc generate these, which store debugging information
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*.pdb
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# RustRover
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# JetBrains specific template is maintained in a separate JetBrains.gitignore that can
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# be found at https://github.com/github/gitignore/blob/main/Global/JetBrains.gitignore
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# and can be added to the global gitignore or merged into this file. For a more nuclear
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# option (not recommended) you can uncomment the following to ignore the entire idea folder.
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#.idea/
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/target
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# Byte-compiled / optimized / DLL files
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__pycache__/
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.pytest_cache/
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*.py[cod]
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# C extensions
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*.so
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# Distribution / packaging
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.Python
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.venv/
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env/
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bin/
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build/
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develop-eggs/
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dist/
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eggs/
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lib/
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lib64/
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parts/
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sdist/
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var/
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include/
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man/
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venv/
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*.egg-info/
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.installed.cfg
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*.egg
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# Installer logs
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pip-log.txt
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pip-delete-this-directory.txt
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pip-selfcheck.json
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# Unit test / coverage reports
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htmlcov/
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.tox/
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.coverage
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.cache
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nosetests.xml
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coverage.xml
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# Translations
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*.mo
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# Mr Developer
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.mr.developer.cfg
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.project
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.pydevproject
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# Rope
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.ropeproject
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# Django stuff:
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*.log
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*.pot
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.DS_Store
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# Sphinx documentation
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docs/_build/
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# PyCharm
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.idea/
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# VSCode
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.vscode/
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# Pyenv
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.python-version
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# Benchmark data cache
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benchmark_data/

‎CI.yml‎

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name: CI
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on:
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push:
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branches:
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- main
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- master
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pull_request:
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jobs:
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linux:
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runs-on: ubuntu-latest
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steps:
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- uses: actions/checkout@v3
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- uses: messense/maturin-action@v1
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with:
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manylinux: auto
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command: build
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args: --release --sdist -o dist --find-interpreter
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- name: Upload wheels
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uses: actions/upload-artifact@v2
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with:
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name: wheels
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path: dist
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windows:
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runs-on: windows-latest
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steps:
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- uses: actions/checkout@v3
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- uses: messense/maturin-action@v1
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with:
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command: build
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args: --release -o dist --find-interpreter
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- name: Upload wheels
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uses: actions/upload-artifact@v2
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with:
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name: wheels
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path: dist
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macos:
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runs-on: macos-latest
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steps:
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- uses: actions/checkout@v3
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- uses: messense/maturin-action@v1
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with:
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command: build
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args: --release -o dist --universal2 --find-interpreter
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- name: Upload wheels
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uses: actions/upload-artifact@v2
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with:
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name: wheels
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path: dist
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release:
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name: Release
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runs-on: ubuntu-latest
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if: "startsWith(github.ref, 'refs/tags/')"
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needs: [ macos, windows, linux ]
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steps:
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- uses: actions/download-artifact@v2
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with:
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name: wheels
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- name: Publish to PyPI
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uses: messense/maturin-action@v1
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env:
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MATURIN_PYPI_TOKEN: ${{ secrets.PYPI_API_TOKEN }}
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with:
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command: upload
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args: --skip-existing *

‎CLAUDE.md‎

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# CLAUDE.md - AI Context for xml_iterator
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## Project Overview
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Fast XML parser with streaming iterator interface, built in Rust with Python bindings. Designed for protection against infinite depth XML attacks through streaming processing.
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## Architecture
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```
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xml_iterator/
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├── src/lib.rs # Rust core: XMLIterator + Python bindings
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├── xml_iterator/core.py # Python utilities: xml_to_dict, get_edge_counts
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├── tests/ # Comprehensive pytest suite
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└── benchmark*.py # Performance testing vs xmltodict
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```
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## Core Components
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### Rust Implementation (`src/lib.rs`)
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- **XMLIterator**: Streaming XML parser using quick-xml
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- **Events**: `start`, `end`, `text`, `empty` (self-closing tags)
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- **Python bindings**: PyO3 integration
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- **Protection**: No depth limits - user controls via early termination
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### Python API
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- **`iter_xml(path)`**: Stream events `(count, event, value)`
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- **`xml_to_dict(path)`**: Convert to dictionary (xmltodict compatible)
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- **`get_edge_counts(path)`**: Count tag hierarchies
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## Key Features
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✅ **100% xmltodict compatibility** - identical results on all test cases
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✅ **Streaming performance** - 734x faster with early termination
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✅ **Memory efficient** - constant memory usage regardless of file size
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✅ **Real-world tested** - handles 300MB+ ESMA FIRDS XML files
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✅ **Error handling** - graceful fallbacks for malformed XML
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## Performance Characteristics
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| Scenario | xml_iterator | xmltodict | Speedup |
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|----------|-------------|-----------|---------|
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| Small files (500 items) | 0.020s | 0.024s | 1.2x |
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| Large files (5000 items) | 0.231s | 0.251s | 1.1x |
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| Early termination | 0.001s | N/A | 734x |
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## Development Workflow
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```bash
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# Build and install
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make develop
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# Run tests
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make test # All tests
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make test-fast # Skip slow tests
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# Run benchmarks
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make benchmark # Synthetic data vs xmltodict
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make benchmark-real # Real ESMA FIRDS data (downloads 17MB)
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# Test specific components
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pytest tests/test_basic.py # Core functionality
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pytest tests/test_xmltodict.py # Compatibility
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pytest tests/test_performance.py # Regression tests
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```
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## Project Status
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- **Complete**: Core functionality, xmltodict compatibility, test suite
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- **Tested**: Synthetic data, real-world XML files, edge cases
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- **Benchmarked**: Performance proven vs xmltodict
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- **Production ready**: Error handling, memory efficiency
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## Files of Interest
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- **`src/lib.rs`**: Main Rust implementation
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- **`xml_iterator/core.py`**: Python utilities and xml_to_dict
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- **`tests/test_xmltodict.py`**: Compatibility verification
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- **`benchmark_real_world.py`**: Real-world performance testing
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- **`benchmark.py`**: Synthetic benchmarks
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## Known Limitations
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- **Attributes ignored**: Only processes tag structure and text content
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- **Single file input**: No streaming from network/pipes (file paths only)
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- **Python-only bindings**: No other language bindings yet
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## Infinite Depth Protection Strategy
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The "infinite depth protection" is achieved through **streaming design**:
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- Events yielded immediately, no waiting for document completion
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- User controls termination via event counting or custom heuristics
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- Constant memory usage regardless of XML nesting depth
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- Examples: `n_max` parameter, early break in iteration
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This is more flexible than hard depth limits since protection logic is use-case dependent.
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## Dependencies
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- **Rust**: quick-xml, pyo3, encoding_rs_io
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- **Python**: Standard library only (tests require pytest, xmltodict)
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- **Build**: maturin for Python extension compilation
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## Testing Philosophy
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- **Exact compatibility**: 100% identical results vs xmltodict
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- **Real-world data**: ESMA FIRDS regulatory XML files
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- **Performance regression**: Ensure no slowdowns
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- **Error resilience**: Graceful handling of malformed XML

‎Cargo.toml‎

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[package]
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name = "xml_iterator"
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version = "0.1.0"
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edition = "2021"
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# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
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[lib]
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name = "xml_iterator"
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crate-type = ["cdylib"]
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[dependencies]
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encoding_rs = "0.8.31"
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encoding_rs_io = "0.1.7"
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pyo3 = { version = "0.17.1", features = ["extension-module"] }
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quick-xml = "0.26.0"

‎LICENSE.txt‎

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Copyright (c) 2025
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in all
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copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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SOFTWARE.

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