Syntax checking/Parser

back to Syntax checking page

Important Classes/Files

eiffel.y

• Eiffel grammar description.
• use geyacc to generate eiffel_parser.e from this file

EIFFEL_PARSER

• inherits from EIFFEL_PARSER_SKELETON (where the features parse, parse_string, make_with_factory are implemented)
• make_with_factory (a_factory: AST_FACTORY): give argument of type AST_NULL_FACTORY (inherits from AST_FACTORY)
• parse (a_file: KL_BINARY_INPUT_FILE) and parse_from_string (a_string: STRING): Both save the results in match_list: LEAF_AS_LIST.

CLASS_AS

• AST of a class

ERROR

• deferred; superclass of all error types like EIFFEL_ERROR or SYNTAX_ERROR
• features line, column: INTEGER give location of error

ERROR_HANDLER

• feature error_list: ERROR is a list of errors found by the parser

SHARED_ERROR_HANDLER

• singleton used by all relevant classes

EIFFEL_CLASS_C

• features build_ast and parse_ast show how the parser can be used.