dsl.py

_dsl = regexes.to_regex(r"""
    (?(DEFINE)
        # Divider for syntactical elements
        (?P<syntax_edge> \s+ )

        # Divider for statements
        (?P<statement_edge> (?:
            # A syntax edge
            (
                **syntax_edge
            ) |
            # A comment
            (
                (?<!
                    ( $ | [^\\] ) # A non-backslash
                    ( (\\){2}   ) # An even number of backslashes
                )
                [#] .* 
            ) |
            (*FAIL)
        )+)

        # Non-greedy all
        (?P<ng_all>
            (?:.|\n)+?
        )

        # A word
        (?P<word> \w+ )
    )

    # NOTE \*\*(?P<name>\w+) gets replaced with (?& $NAME )
    **statement_edge?
    (
    (
        (?P<kind> REGEX )
        **syntax_edge
        (?P<name> **word)
        **syntax_edge
        (?P<pattern> **ng_all)
        **syntax_edge
        END
    ) |
    (
        (?P<kind> EXCLUDE_PATH )
        **syntax_edge
        (?P<pattern> **ng_all)
        **syntax_edge
        END
    ) |
    (
        (?P<kind> (((PRE|POST)_)?REPLACE))
        **syntax_edge
        (?P<pattern>   **ng_all )
        **syntax_edge
        WITH
        **syntax_edge
        (?P<replacement> **ng_all )
        **syntax_edge
        END
    ) |
    (
        (?P<kind> (DEFINE))
        **syntax_edge
        (?P<macro> .+)
    ) |
    (
        (?P<kind> (UNDEFINE))
        **syntax_edge
        (?P<macro> .+)
    ) |
    (
        (?P<kind> (MAP TYPE))
        **syntax_edge
        (?P<macro> .+)
    ) |
    (
        (?P<kind> (MAP IDENTIFIER))
        **syntax_edge
        (?P<macro> .+)
    ) |
    (
        (?P<kind> (SUFFIX))
        **syntax_edge
        (?P<macro> .+)
    ) |
    (
        (?P<kind> (PREFIX))
        **syntax_edge
        (?P<macro> .+)
    ) |


    (*FAIL)
    )

    **statement_edge?
""")