Struct NoSemanticHooks 

pub struct NoSemanticHooks;

Default hook object used by parsers that do not need user-supplied semantics.

Trait Implementations

impl Clone for NoSemanticHooks

fn clone(&self) -> NoSemanticHooks

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for NoSemanticHooks

impl Debug for NoSemanticHooks

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

Formats the value using the given formatter.

impl Default for NoSemanticHooks

fn default() -> NoSemanticHooks

Returns the “default value” for a type.

impl SemanticHooks for NoSemanticHooks

const ENABLES_LEXER_LIFECYCLE: bool = false

Whether generated lexers should route lifecycle callbacks through this hook object.

fn observes_parser_predicates(&self) -> bool

Whether this hook object may observe parser predicate transitions.

fn sempred<S>( &mut self, ctx: &mut ParserSemCtx<'_, S>, rule_index: usize, pred_index: usize, ) -> Option<bool>

where S: TokenSource,

fn action<S>( &mut self, ctx: &mut ParserSemCtx<'_, S>, action: ParserAction, ) -> bool

where S: TokenSource,

fn lexer_sempred<I>( &mut self, ctx: &mut LexerSemCtx<'_, I>, rule_index: usize, pred_index: usize, ) -> Option<bool>

where I: CharStream,

fn lexer_action<I>( &mut self, ctx: &mut LexerSemCtx<'_, I>, action: LexerCustomAction, ) -> bool

where I: CharStream,

Runs a lexer custom action on the committed lexing path. Returns whether the hook handled the action.

fn lexer_reset<I>(&mut self, ctx: &mut LexerLifecycleCtx<'_, I>)

where I: CharStream,

Runs after runtime-owned lexer state has been reset for reuse.

fn lexer_before_token<I>(&mut self, ctx: &mut LexerLifecycleCtx<'_, I>)

where I: CharStream,

Runs before the runtime returns a queued token or starts a new ATN token match.

fn lexer_after_accept<I>(&mut self, ctx: &mut LexerLifecycleCtx<'_, I>)

where I: CharStream,

Runs after the accepted path’s portable and custom actions, but before the token span is finalized and emitted.

fn lexer_token_emitted(&mut self, token: TokenView<'_>)

Observes a token after committed lexer actions and portable commands have run and the token has been emitted, immediately before it is returned to the token stream.