Struct ParseGroup 

pub struct ParseGroup {
    pub anchor: ItemRef,
    pub members: Vec<Option<ItemRef>>,
}

A resolved group of member nodes handed to a multi-input ParseRule.

The anchor is the required defining node (always present). members holds the resolved ItemRef for every slot in descriptor order, None for an unfilled optional slot. Index 0 is always the anchor (Some). A single-input parse sees a group with just the anchor.

Fields

anchor: ItemRef

members: Vec<Option<ItemRef>>

Implementations

impl ParseGroup

pub fn single(anchor: ItemRef) -> Self

A trivial size-1 group wrapping a single anchor node.

pub fn member(&self, index: usize) -> Option<&ItemRef>

The resolved member at slot index (descriptor order), if filled.

pub fn present(&self) -> impl Iterator<Item = &ItemRef>

All filled members (anchor + present optionals), in slot order.

Trait Implementations

impl Clone for ParseGroup

fn clone(&self) -> ParseGroup

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for ParseGroup

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.