Struct CompiledLexerDfa 

pub struct CompiledLexerDfa { /* private fields */ }

A lexer DFA compiled ahead of time from a lexer ATN.

Build one per grammar with CompiledLexerDfa::compile (generated lexers cache it in a OnceLock beside the deserialized ATN) and match tokens through crate::atn::lexer::next_token_compiled or crate::atn::lexer::next_token_compiled_with_hooks.

Implementations

impl CompiledLexerDfa

pub fn compile(atn: &Atn) -> Self

Compiles every lexer mode of atn that has no semantic predicates and fits the state budget; the rest stay interpreter-matched.

pub fn has_compiled_modes(&self) -> bool

True when at least one lexer mode compiled to static tables.

pub const fn state_count(&self) -> usize

Number of compiled DFA states across all modes (diagnostics).

pub fn compiled_mode_flags(&self) -> Vec<bool>

Per-mode compilation outcome (diagnostics): true = static tables.

pub fn mode_state_counts(&self) -> Vec<usize>

Per-mode state counts (diagnostics), derived from start offsets.

pub fn serialize(&self) -> Vec<u32>

Flattens the compiled DFA into a u32 stream for embedding in generated code.

The format is internal to this runtime version; Self::from_serialized rejects streams from other versions so generated lexers can fall back to Self::compile.

pub fn from_serialized(data: &[u32]) -> Option<Self>

Rebuilds a compiled DFA from Self::serialize output; None when the stream comes from a different runtime version or is malformed.

Trait Implementations

impl Clone for CompiledLexerDfa

fn clone(&self) -> CompiledLexerDfa

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for CompiledLexerDfa

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

Formats the value using the given formatter.