# 0.3.0 / 2012-02-20

* Major enhancements

  * The ugly "refinement ... end" construction has been removed. See info in the breaking
    changes section below.
  * The grammar now allows a task definition to contain the definition of sub tasks. The
    idiomatic place is after fluent and trackvar definitions and before the refinement.

* Minor enhancements

  * The --graph option now outputs one graph for each task_def in the unit. Previously only
    the graph of the last task definition was printed.

* Bugfixes

  * Missing edges for absent else clauses are now added to the graph generated by
    the --graph option (ToGraph).

* Breaking changes

  * The syntax and AST of a task definition has changed. The "refinement ... end" construct
    has been removed and replaced by an explicit process statement. Accordingly, the nodes
    task_refinement and task_signature have been removed as well. The AST signature of a task
    definition is now as follows:

        [:task_def, "TaskName", (fluent_def, trackvar_def, task_def)*, explicit_statement]

# 0.2.0 / 2012-02-17

* Enhancements

  * A --graph option has been added to the main `gisele` shell command. It outputs a graph
    in the graphviz/dot format representing a process as a box-and-arrow workflow.

* Breaking changes

  * Boolean literals (true, false) are now explicitly represented in boolean expressions,
    under a :bool_lit AST node.
  * All statements and clauses relying on boolean conditions (if_st, while_st, elsif_clause,
    when_clause) have now an explicit :bool_expr node as first child. Previously, a subnode
    of the boolean grammar was used.

# 0.1.0 / 2012-02-17

* Enhancements

  * The main `gisele` command now accepts a --no-sugar option that removes syntactic
    sugar. This option is limited to the rewriting of `if` statements as guarded `case`
    commands for now. Additional rewriting could be added in the future.
  * All AST nodes (obtained via `Gisele.ast` or similar) now include the module
    `Gisele::Language::AST::Node` which contains a few utilities.

* Breaking changes

  * The language package has been reorganized and is now considered as belonging to
    the private API. Further changes there will therefore not b considered as Breaking
    changes in the future (expect the structure of the AST, of course).
    The `Gisele.parse` and `Gisele.ast` methods belong to the public API and are therefore
    the way to (parse / get an AST) from a process file / source.

  * The top AST element of a process file is always a :unit. The latter may contain
    one ore more task definitions. Import/include nodes will probably be added later
    and authorized at the beginning of the file.

  * The following syntax nodes have been renamed:

        :varref     -> :var_ref
        :or         -> :bool_or
        :and        -> :bool_and
        :not        -> :bool_not
        :if         -> :if_st
        :else       -> :else_clause
        :elsif      -> :elsif_clause
        :while      -> :while_st
        :seq        -> :seq_st
        :par        -> :par_st
        :task_call  -> :task_call_st
        :task       -> :task_def
        :signature  -> :task_signature
        :refinement -> :task_refinement

# 0.0.1 / 2012-02-16

* Enhancements

  * Birthday!