pyodide/pyodide_build/common.py

from pathlib import Path
from typing import Optional, Set


ROOTDIR = Path(__file__).parents[1].resolve() / 'tools'
HOSTPYTHON = ROOTDIR / '..' / 'cpython' / 'build' / '3.7.4' / 'host'
TARGETPYTHON = ROOTDIR / '..' / 'cpython' / 'installs' / 'python-3.7.4'
DEFAULTCFLAGS = ''
DEFAULTLDFLAGS = ' '.join([
    '-O3',
    '-s', "BINARYEN_METHOD='native-wasm'",
    '-Werror',
    '-s', 'EMULATED_FUNCTION_POINTERS=1',
    '-s', 'EMULATE_FUNCTION_POINTER_CASTS=1',
    '-s', 'SIDE_MODULE=1',
    '-s', 'WASM=1',
    '--memory-init-file', '0'
    ])


def parse_package(package):
    # Import yaml here because pywasmcross needs to run in the built native
    # Python, which won't have PyYAML
    import yaml
    # TODO: Validate against a schema
    with open(package) as fd:
        return yaml.load(fd)


def _parse_package_subset(query: Optional[str]) -> Optional[Set[str]]:
    """Parse the list of packages specified with PYODIDE_PACKAGES env var.

    Also add the list of mandatory packages: ['micropip', 'distlib']

    Returns:
      a set of package names to build or None.
    """
    if query is None:
        return None
    packages = query.split(',')
    packages = [el.strip() for el in packages]
    packages = ['micropip', 'distlib'] + packages
    return set(packages)