Struct FragmentBuilder 

pub struct FragmentBuilder;

Builder for constructing NFA fragments with fragment-local state IDs.

Fragments are created with position-based IDs (state.id == index), which is the invariant required by all composition operations. The builder is stateless — each fragment starts with IDs from 0.

Implementations

impl FragmentBuilder

pub fn new() -> Self

Create a new fragment builder

pub fn single_term( &self, term: NfaTerm, origin: Option<SourceRef>, ) -> NfaFragment

Build a single-term fragment

Creates a fragment with one term state (id=0) and one epsilon exit state (id=1). The term state has a consuming transition to the exit.

pub fn epsilon_fragment(&self) -> NfaFragment

Build an epsilon-only fragment

Creates a minimal fragment that matches nothing (empty string). Used for optional content and as base case for empty sequences.

Trait Implementations

impl Debug for FragmentBuilder

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

Formats the value using the given formatter.

impl Default for FragmentBuilder

fn default() -> Self

Returns the “default value” for a type.