PARSER Sample Clauses

PARSER. As already mentioned there are two parsers: one for parsing a .NET assembly and one for reading an XML representation of the contracts. The .NET parser (CW_DOTNET_PARSER) produces the AST by retrieving information from the .NET assembly using the reflection mechanism of .NET. It parses the following information required to generate Eiffel proxy classes: • public types • public .NET constructors • public .NET methods • public .NET fields For every inspected information a specific type node of the AST is instantiated and appended to it (see Figure 2: Internal representation of proxy classes): • CW_TYPE for each public type • CW_ATTRIBUTE for every inspected public field • CW_PROCEDURE respectively CW_FUNCTION for each method • CW_CREATION_PROCEDURE for every parsed constructor To generate the Eiffel proxy classes correctly, the generator has to know more than just the name of an AST node. Important information can be: is a type deferred or expanded, is a feature static or deferred, what is the return type of a function? To satisfy these needs every node type holds some specific attributes that the parser sets. For each type (CW_TYPE) the parser sets the following queries: • is_deferred (is type deferred?) • is_expanded (is type expanded?) • is_array (is type an array?) • is_enum (is it an enumeration type?; an enumeration type is a distinct type with named constants) • is_interface (does type represent a .NET interface?) Moreover, the parser attaches to a type all interfaces (CW_INTERFACE) which it implements. An attribute is enriched with the following information: • is_static (is it a static field?) • is_constant (does the field represent a constant value?) • value (if the parsed field is a constant, a constant value is assigned) For each procedure and function, the parser sets the following attributes: • is_static (is method static?; static method are accessed through the class) • is_deferred (is method deferred?; deferred methods are methods declared in a .NET interface type) Additionally a function has the attributes: • return_type (the function’s return type) • is_property (a property is a member that provides access to a characteristic of an object or a class, attribute is set to true if the function is a get accessor) A helper class CW_NAME_FORMATTER translates the .NET names into Eiffel names. The .NET naming style is “CamelCase” and Eiffel’s convention is to use lower case and to separate names with an underscore. For example “toString” becomes “to...
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PARSER. The parser is responsible for reading in CML files and building the raw represen- tation of the contained model as an AST. It was built using the ANTLR parser generator, however, most of the error recovery features are presently disabled in favour of a fail-on-first-error approach. We will re-enable and elaborate upon the error recovery features as the project progresses beyond M16. The parser is found in the blue box labelled “parser” in Figure 11.
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PARSER. Both the configuration and CLI commands are analyzed using a syntax driven parser generated by the bison tool from a grammar which is constructed from information gathered from grammar snippets by the gen_parser.m4 script. Grammar snippets are files (usually with extension .Y) contributed by various BIRD modules in order to provide information about syntax of their configuration and their CLI commands. Each snipped consists of several sections, each of them starting with a special keyword: CF_HDR for a list of #include directives needed by the C code, CF_DEFINES for a list of C declarations, CF_DECLS for bison declarations including keyword definitions specified as CF_KEYWORDS, CF_GRAMMAR for the grammar rules, CF_CODE for auxiliary C code and finally CF_END at the end of the snippet. To create references between the snippets, it's possible to define multi-part rules by utilizing the CF_ADDTO macro which adds a new alternative to a multi-part rule. CLI commands are defined using a CF_CLI macro. Its parameters are: the list of keywords determining the command, the list of parameters, help text for the parameters and help text for the command. Values of enum filter types can be defined using CF_ENUM with the following parameters: name of filter type, prefix common for all literals of this type and names of all the possible values.
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