class

Pegasus::Pda::LookaheadItem

Inherits Pegasus::Pda::DottedItem / Reference / Object

A superclass of the DottedItem which also keeps a lookahead set to further distinguish it in LR(1) parser construction.

Constructors

new(item, lookahead : Set(Pegasus::Elements::LookaheadElement), index = 0_i64)

Creates a new lookahead dotted item.

==(other : LookaheadItem)

Compares this dotted item to another dotted item.

hash(hasher)

Hashes this dotted item.

insert_reduce?(action_table, state, self_index)

insert_shift?(action_table, state)

lookahead

The lookahead set of this dotted item.

to_s(io)