cml-parser 0.2.0

A Python parser for Context Mapper DSL (CML)

CML Parser

A Python library to parse the Context Mapper Language (CML) using ANTLR4. It aims to cover the language defined by the Context Mapper project and is validated against the official sample models.

Context

CML is the DSL for Context Mapper, a toolkit for strategic/tactical Domain-Driven Design modeling. Reference material and canonical examples are maintained by the Context Mapper team:

• Language docs: https://contextmapper.org/
• Official examples repository: https://github.com/ContextMapper/context-mapper-examples

Installation

Using uv (Recommended) ⚡

uv is a fast Python package manager that's 10-100x faster than pip:

# Install from PyPI
uv pip install cml-parser

# Or clone and install from source
git clone https://github.com/martin882003/cml_parser.git
cd cml_parser
uv sync

Using pip

pip install cml-parser

From Source (pip)

git clone https://github.com/martin882003/cml_parser.git
cd cml_parser
pip install -e .

Usage

from cml_parser import parse_file

# Strict mode: raises CmlSyntaxError on parse errors
model = parse_file("path/to/model.cml")

# Safe mode: returns CML object with parse_results
from cml_parser import parse_file_safe
cml = parse_file_safe("path/to/model.cml")

if cml.parse_results.ok:
    print(f"✓ Parsed successfully")
    print(f"  Domains: {len(cml.domains)}")
    print(f"  Context Maps: {len(cml.context_maps)}")
    
    # Access tactical DDD elements
    for cm in cml.context_maps:
        for ctx in cm.contexts:
            for agg in ctx.aggregates:
                print(f"  Aggregate: {agg.name}")
                for entity in agg.entities:
                    print(f"    Entity: {entity.name}")
                    for attr in entity.attributes:
                        print(f"      - {attr.name}: {attr.type}")
else:
    print("Parse errors:")
    for err in cml.parse_results.errors:
        print(f"  {err.pretty()}")

Architecture

This parser is built with ANTLR4, providing:

• ✅ Robust parsing of CML syntax
• ✅ Full support for tactical DDD elements (Entities, ValueObjects, Aggregates, etc.)
• ✅ Strategic DDD (BoundedContexts, ContextMaps, Relationships)
• ✅ Deferred reference linking for forward declarations
• ✅ Rich Python object model with accessor methods

Development

Setup with uv

git clone https://github.com/martin882003/cml_parser.git
cd cml_parser
uv sync
uv run pytest

Setup with pip

git clone https://github.com/martin882003/cml_parser.git
cd cml_parser
python -m venv venv
source venv/bin/activate
pip install -e .
pytest

Regenerating the Parser

If you modify the ANTLR4 grammar (src/cml_parser/CML.g4):

# Install development dependencies
uv add --dev antlr4-tools

# Regenerate parser
uv run antlr4 -Dlanguage=Python3 -visitor -o src/cml_parser/antlr src/cml_parser/CML.g4

License

MIT License — see LICENSE.

Contact

• Maintainer: Martin Herran — [e-mail]

Contributing

Contributions are welcome! Please:

1. Open an issue describing the change (grammar gaps, bugs, docs).
2. Keep coverage: ensure pytest passes and new constructs are represented in examples/ or new fixtures.
3. Submit a PR with a concise summary of the change.