Method parse

pex/platforms.py:86–126

(cls, platform_spec)

    @classmethod
    def parse(cls, platform_spec):
        # type: (str) -> PlatformSpec
        platform_components = platform_spec.rsplit(cls.SEP, 3)
        try:
            plat, impl, version, abi = platform_components
        except ValueError:
            raise cls.InvalidSpecError.create(
                platform_spec,
                cause="There are missing platform fields. Expected 4 but given {count}.".format(
                    count=len(platform_components)
                ),
            )

        version_components = version.split(".")
        if len(version_components) == 1:
            component = version_components[0]
            if len(component) < 2:
                raise cls.InvalidSpecError.create(
                    platform_spec,
                    cause=(
                        "The version field must either be a 2 or more digit digit major/minor "
                        "version or else a component dotted version. "
                        "Given: {version!r}".format(version=version)
                    ),
                )

            # Here version is py_version_nodot (e.g.: "37" or "310") as outlined in
            # https://peps.python.org/pep-0425/#python-tag
            version_components = [component[0], component[1:]]

        try:
            version_info = cast("VersionInfo", tuple(map(int, version_components)))
        except ValueError:
            raise cls.InvalidSpecError.create(
                platform_spec,
                cause="The version specified had non-integer components. Given: {version!r}".format(
                    version=version
                ),
            )

        return cls(platform=plat, impl=impl, version=version, version_info=version_info, abi=abi)

    @classmethod
    def from_tag(cls, tag):