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Edit: /opt/gsutil/third_party/pyparsing/examples/statemachine/documentsignoffstate.pystate

#
# documentsignoffstate.pystate
#
# state machine model of the states and associated behaviors and properties for each
# different state of a document in a document control system
#
# example using named state transitions

# This implements a state model for submitting,
# approving, activating, and purging document
# revisions in a document management system.
#
# The state model looks like:
#
#   New
#    |
#    | (create)
#    |
#    v
#   Editing ----------------------------------------------+
#    |   ^                                                |
#    |   |                                                |
#    |   +----------+                                     |
#    |              |                                     |
#    | (submit)     |                                     | (cancel)
#    |              | (reject)                            |
#    v              |                                     |
#   PendingApproval-+                                     |
#    |                                                    |
#    | (approve)                                          |
#    |                                                    |
#    v                                                    |
#   Approved <--------------------------+ (deactivate)    |
#    |    |                             |                 |
#    |    +--------------+              |                 |
#    |                   | (activate)   |                 |
#    |                   v              |                 |
#    | (retire)        Active ----------+                 |
#    |                                                    |
#    v                                                    |
#   Retired                                               |
#    |                                                    |
#    | (purge)                                            |
#    |                                                    |
#    v                                                    |
#   Deleted <---------------------------------------------+
#
#
# There is no behavior attached to these states, this is
# just an example of a state machine with named transitions.
#

statemachine DocumentRevisionState:
    New      -( create     )-> Editing
    Editing  -( cancel     )-> Deleted
    Editing  -( submit     )-> PendingApproval
    PendingApproval  -( reject     )-> Editing
    PendingApproval  -( approve    )-> Approved
    Approved -( activate   )-> Active
    Active   -( deactivate )-> Approved
    Approved -( retire     )-> Retired
    Retired  -( purge      )-> Deleted

New.description = 'creating...'
Editing.description = 'editing...'
PendingApproval.description = 'reviewing...'
Approved.description = 'approved/inactive...'
Active.description = 'approved/active...'
Deleted.description = 'deleted...'
Retired.description = 'retired...'

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