add mkport() for safely making ports
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@ -142,6 +142,30 @@ class PortList(metaclass=ABCMeta):
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# because it's weird on stuff like Pattern that contains other lists
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# and because you can just grab .ports and use that instead
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def mkport(
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self,
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name: str,
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value: Port,
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) -> Self:
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"""
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Create a port, raising a `PortError` if a port with the same name already exists.
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Args:
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name: Name for the port. A port with this name should not already exist.
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value: The `Port` object to which `name` will refer.
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Returns:
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self
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Raises:
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`PortError` if the name already exists.
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"""
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if name in self.ports:
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raise PortError(f'Port {name} already exists.')
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assert name not in self.ports
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self.ports[name] = value
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return self
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def rename_ports(
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self,
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mapping: dict[str, str | None],
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