morphql · Python client

Python client for MorphQL — a declarative DSL for structural data transformation.

Delegates execution to the MorphQL CLI or a running MorphQL server. Zero external dependencies. Python >= 3.8.

Installation

pip install morphql

Quick start

from morphql import MorphQL

# One-shot static call (CLI provider)
result = MorphQL.execute(
    "from json to json transform set name = source.firstName",
    data={"firstName": "Alice"},
)
print(result)  # {"name":"Alice"}

# From a .morphql file
result = MorphQL.execute_file("transform.morphql", data={"x": 1})

# Instance with preset defaults (server provider)
morph = MorphQL(provider="server", server_url="http://localhost:3000")
result = morph.run("from json to json transform set x = source.x", data={"x": 42})
result = morph.run_file("transform.morphql", data={"x": 42})

Providers

Provider	How it works
`"cli"`	Runs `morphql` CLI via `subprocess` (default)
`"server"`	`POST {server_url}/v1/execute` via `urllib`

Options

Option	Default	Env var
`provider`	`"cli"`	`MORPHQL_PROVIDER`
`runtime`	`"node"`	`MORPHQL_RUNTIME`
`cli_path`	`"morphql"`	`MORPHQL_CLI_PATH`
`node_path`	`"node"`	`MORPHQL_NODE_PATH`
`qjs_path`	auto-resolved	`MORPHQL_QJS_PATH`
`cache_dir`	`$TMPDIR/morphql`	`MORPHQL_CACHE_DIR`
`server_url`	`"http://localhost:3000"`	`MORPHQL_SERVER_URL`
`api_key`	`None`	`MORPHQL_API_KEY`
`timeout`	`30` (seconds)	`MORPHQL_TIMEOUT`

Priority: call kwarg > instance default > env var > hardcoded default.

API

Static

MorphQL.execute(query, data=None, **options) -> str
MorphQL.execute_file(query_file, data=None, **options) -> str

Instance

morph = MorphQL(**defaults)
morph.run(query, data=None, **options) -> str
morph.run_file(query_file, data=None, **options) -> str

data accepts str (JSON), dict, list, or None.

Exceptions

Situation	Exception
`query` missing or empty	`ValueError`
Query file not found	`FileNotFoundError`
CLI exits with error	`RuntimeError`
Server HTTP error	`RuntimeError`
Server unreachable	`RuntimeError`

Running tests

cd packages/python
PYTHONPATH=src python -m unittest discover tests/
# or with pytest:
pip install pytest
pytest

License

MIT

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