Enum LexerSource 

pub enum LexerSource<'a> {
    Basic(&'a BasicLexer),
    Contextual(&'a ContextualLexer),
    Custom(&'a Mutex<dyn TokenSource + Send + 'a>),
}

Which lexer drives a parse (contextual becomes the real LALR default; the basic path stays for bootstrap/diagnostics). Copy — it holds only immutable references, so a caller can drive the same source through more than one entry (e.g. the tree vs. no-tree parity A/B).

Variants

Basic(&'a BasicLexer)

Contextual(&'a ContextualLexer)

Custom(&'a Mutex<dyn TokenSource + Send + 'a>)

A caller-implemented crate::custom::TokenSource (Lark’s custom lexer class). Behind a shared &Mutex so this enum stays Copy and an interactive copy() shares the source — exactly Lark’s LexerThread.__copy__, which copies the lexer state but shares the lexer object (a custom source owns its own cursor, so forks share it). The loop pulls it lazily, one token per needed feed, keyed on the live parser state (custom.rs module docs).

Trait Implementations

impl<'a> Clone for LexerSource<'a>

fn clone(&self) -> LexerSource<'a>

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<'a> Copy for LexerSource<'a>