def build_top_level(ast, unit):
# Extract package declaration, if it exists.
pkg = ASTNode('PackageDeclaration')
package_decl = unit.find_child('PackageDeclaration')
if package_decl is not None:
#pkg.children = flatten_name(package_decl[1])
pkg = flatten(package_decl[1], 'PackageDeclaration', 'Identifier')
ast.add(pkg)
# Extract imports, if they exist.
typ_imports = ASTNode('TypeImports')
pkg_imports = ASTNode('PackageImports')
import_decl = unit.find_child('ImportDeclarations')
if import_decl is not None:
typ_imports.children, pkg_imports.children = flatten_imports(import_decl)
ast.add(typ_imports)
ast.add(pkg_imports)
# Extract type declaration.
typ_decl = unit.find_child('TypeDeclarations')
if typ_decl is not None and typ_decl[0][0].name != 'SemiColon':
if typ_decl[0][0].name == 'ClassDeclaration':
typ = build_class_structure(typ_decl[0][0])
elif typ_decl[0][0].name == 'InterfaceDeclaration':
typ = build_interface_structure(typ_decl[0][0])
ast.add(typ)
return ast
