BB.Error.Kinematics.NotAnAncestor exception (bb v0.28.0)

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A source link does not sit above a target link in the kinematic tree.

Returned by BB.Robot.path_between/3, which is restricted to chains that descend from the source to the target.

common_ancestor is always populated, which turns the message from a complaint into an instruction: it names the link the caller should have passed as the source. There is no "disconnected" case to represent — BB.Dsl.TopologyTransformer rejects any topology without exactly one root link, and the DSL's nesting makes cycles structurally impossible, so any two links in a robot share at least the root as a common ancestor.

Summary

Types

t()

Functions

exception(args)

Create an Elixir.BB.Error.Kinematics.NotAnAncestor without raising it.

Types

t()

@type t() :: %BB.Error.Kinematics.NotAnAncestor{
  __exception__: term(),
  bread_crumbs: term(),
  class: term(),
  common_ancestor: atom(),
  path: term(),
  source_link: atom(),
  splode: term(),
  stacktrace: term(),
  target_link: atom(),
  vars: term()
}

Functions

exception(args)

@spec exception(opts :: Keyword.t()) :: %BB.Error.Kinematics.NotAnAncestor{
  __exception__: term(),
  bread_crumbs: term(),
  class: term(),
  common_ancestor: term(),
  path: term(),
  source_link: term(),
  splode: term(),
  stacktrace: term(),
  target_link: term(),
  vars: term()
}

Create an Elixir.BB.Error.Kinematics.NotAnAncestor without raising it.

Keys

  • :source_link
  • :target_link
  • :common_ancestor