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Generator Operators

See here for more information about Generator Operators.

Expression

Attribute

Description

!a

A

Not predicate. Ensure that a does not succeed generating, but don't create any output

&a

A

And predicate. Ensure that a does succeed generating, but don't create any output

-a

optional<A>

Optional. Generate a zero or one time

*a

vector<A>

Kleene. Generate a zero or more times

+a

vector<A>

Plus. Generate a one or more times

a | b

variant<A, B>

Alternative. Generate a or b

a << b

tuple<A, B>

Sequence. Generate a followed by b

a % b

vector<A>

List. Generate a delimited b one or more times

For more information about the attribute propagation rules implemented by the compound generators please see Generator Compound Attribute Rules.


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