This representation is the second in the compilation chain (see Architecture). Its main difference with the surface representation is that the legislative text has been discarded and all the definitions of each variables have been collected in the same place rather than being scattered across the code base.
The module describing the abstract syntax tree is:
Desugared.AstAbstract syntax tree of the desugared representation
Translation to the scope language
Desugared.DependencyScope dependencies computations using OCamlgraph
Before the translation to the scope language,
Desugared.Dependency checks that within a scope, there is no computational circular dependency between the variables of the scope. When the dependency graph is a DAG,
Desugared.Desugared_to_scope performs a topological ordering to produce an ordered list of the scope definitions compatible with the computation order. All the graph computations are done using the Ocamlgraph library.
The other important piece of work performed by
Desugared.Desugared_to_scope is the construction of the default trees (see
Dcalc.Ast.EDefault) from the list of prioritized rules.