Attributes

The behavior of individual subparsers or units can be controlled with attributes.

type Version = unit {
    major: bytes &until=b".";
    minor: bytes &until=b".";
    patch: bytes &eod;
} &convert="v%s.%s.%s" % (self.major, self.minor, self.patch);

There are a wide range of both generic and type-specific attributes, e.g.,

• the &size and &max-size attributes to control how much data should be parsed,
• attributes &parse-from and &parse-at allowing to change where from where data is parsed,
• &convert to transform the value and/or type of parsed data, or
• &requires to enforce post conditions.

Type-specific attributes are documented together with their type.