ABSTRACT SYNTAX TREE Sample Clauses

ABSTRACT SYNTAX TREE. The class CW_CONTROLLER decides if the wizard parses the .NET assembly or the XML file. For that it looks up whether a XML file exists or not. The .NET parser and the XML parser produce an abstract syntax tree (AST) that contains the data to produce Eiffel proxy classes and their XML representation containing the contracts. The AST is a list of elements of type CW_TYPE. An instance of CW_TYPE has features (CW_FEATURE), interfaces (CW_INTERFACE) and invariants (CW_INVARIANT). A feature can either be a routine (CW_ROUTINE) or an attribute (CW_ATTRIBUTE). Attributes represent fields; routines represent computations applicable to all instances of a class. A routine may has multiple arguments (CW_ARGUMENT). It is further classified into a function (CW_FUNCTION) if it returns a result or a procedure (CW_PROCEDURE) otherwise. Each feature has a list of preconditions (CW_PRECONDITION) and postconditions (CW_POSTCONDITION).
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ABSTRACT SYNTAX TREE. To master the more powerful .NET parser it was necessary to adapt the type definition from the abstract syntax tree (AST). As already mentioned in the previous section, the parser adds an explicit interface member implementation as a private feature to the current type. I extended the class CW_FEATURE with the attribute is_public. When is_public returns false the feature is treated as private. In the GUI application only public types are listed in the assembly tree. An important feature is the attribute overloaded_name that returns the overloaded Eiffel name (name of Eiffel feature when more than one feature in the class has the same name). The attribute is attached to CW_FEATURE. The classes CW_FEATURE_LIST and CW_CREATION_PROCEDURE_LIST handle the assignment of overloaded_name to every feature in the AST. The class CW_TYPE has a new attribute is_by_reference. If a method parameter in the original .NET method is specified with the out or ref keyword, the type of the parameter is a reference type and is_by_reference is set to true. A method can consist of the following kinds of formal parameters: value parameters, reference parameters, output parameters, and parameter arrays. DOCUMENT TYPE DEFINITION The XML generator stores the structure of the AST in an XML file. In an iterative use the wizard parsed the XML file instead of the .NET assembly to get the internal representation of the Eiffel classes. The structure of the XML file is defined by a document type definition (DTD). This DTD defines the legal building blocks of an XML document. Various tools verify the structure of an XML document against a DTD. Table 23 shows the DTD, changes are marked with a yellow border. <?xml version="1.0" encoding="utf-8"?> <!ELEMENT cw_ast (cw_type+)> <!ELEMENT cw_type (interfaces?, cw_creation_procedures?, cw_attributes?, cw_procedures?, cw_functions?, cw_invariants?)?> <!ELEMENT cw_creation_procedures (cw_creation_procedure)*> <!ELEMENT cw_attributes (cw_attribute)*> <!ELEMENT cw_procedures (cw_procedure)*> <!ELEMENT cw_functions (cw_function)*> <!ELEMENT cw_preconditions (cw_precondition)*> <!ELEMENT cw_postconditions (cw_postcondition)*> <!ELEMENT cw_invariants (cw_invariant)*> <!ELEMENT interfaces (interface)*> <!ELEMENT cw_arguments (cw_argument)*> <!ELEMENT cw_type dotnet_name CDATA #REQUIRED eiffel_name CDATA #REQUIRED namespace CDATA #REQUIRED is_deferred (yes | no) #REQUIRED is_expanded (yes | no) #REQUIRED is_enum (yes | no) #REQUIRED is_interface (yes | no) #...
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