Event-based automaton projection
The event-based automaton projection takes an automaton and a subset of the events of its alphabet that should be preserved. The other events of the alphabet are considered to be internal steps and get replaced by epsilon at the edges. The algorithm produces a deterministic automaton with the subset as its alphabet that has the same language.
The tool takes a .cif file containing one automaton, and the names of the events that should be preserved. In addition, the general event-based restrictions apply as well.
The output is a .cif file containing a deterministic automaton that is language equivalent with the input automaton with respect to the set of preserved events. The resulting automaton has the same kind as the input automaton. The resulting automaton is a DFA that it is not necessarily minimal, but can be minimized using the DFA minimizer.
Starting the automaton projection tool
The tool can be started in the following ways:
In Eclipse, right click a
.ciffile in the Project Explorer tab or Package Explorer tab and choose .In Eclipse, right click an open text editor for a
.ciffile and choose .Use the
cifprojtool in a ToolDef script. See the scripting documentation and tools overview page for details.Use the
cifprojcommand line tool.
Options
Besides the general application options, this application has the following options:
Input file: The absolute or relative local file system path to the input CIF specification.
Preserved events: Comma and/or whitespace separated absolute names of events that should be preserved.
Output file: The absolute or relative local file system path to the output CIF specification. If not specified, defaults to the input file path, where the
.ciffile extension is removed (if present), and a_projected.ciffile extension is added. Theprojectedpart of the default extension depends on the Result name option.Result name: The name to use for the projected automaton. If not specified, defaults to
projected. Also affects the Output file option.Add state annotations: Add state annotations to the locations of the automaton in the output CIF file. This option is enabled by default. If the output CIF file has an automaton with only a single non-initial location, then the location does not get a state annotation, regardless of whether the option is enabled or not.