Struct LexerSemCtx

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pub struct LexerSemCtx<'a, I, F = CommonTokenFactory>where
    I: CharStream,
    F: TokenFactory,
{ /* private fields */ }

Expand description

Runtime view passed to lexer semantic hooks.

Implementations§

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impl<'a, I, F> LexerSemCtx<'a, I, F>
where I: CharStream, F: TokenFactory,

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pub const fn rule_index(&self) -> usize

Lexer rule index that owns the predicate/action coordinate.

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pub const fn coordinate_index(&self) -> usize

Predicate/action index inside the owning lexer rule.

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pub const fn position(&self) -> usize

Absolute input position where the predicate/action transition fired.

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pub fn mode(&self) -> i32

Lexer mode at this coordinate.

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pub const fn column(&self) -> usize

Current source column.

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pub fn position_column(&self) -> usize

Source column at Self::position.

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pub const fn token_start_column(&self) -> usize

Column captured at the current token start.

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pub fn text_so_far(&self) -> String

Text matched from token start to this coordinate.

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pub fn set_mode(&mut self, mode: i32) -> bool

Sets the current lexer mode. Available only from a custom-action hook (the mutable-borrow context); a no-op with a warning path for the speculative predicate context, where mutating lexer state is invalid.

Returns true if the mutation was applied (action context), false if it was ignored (predicate context).

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pub fn push_mode(&mut self, mode: i32) -> bool

Pushes the current mode and switches to mode. Action context only; see Self::set_mode for the return value.

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pub fn pop_mode(&mut self) -> Option<i32>

Pops the mode stack, restoring the previous mode. Action context only; returns the popped mode (None if the stack was empty or this is a predicate context).