Struct Scanner 

pub struct Scanner { /* private fields */ }

JSON scanner state machine.

The scanner operates on a byte buffer and tracks position. For streaming, the buffer can be refilled when Token::NeedMore is returned.

Implementations

impl Scanner

pub fn new() -> Self

Create a new scanner starting at position 0

pub fn at_position(pos: usize) -> Self

Create a scanner starting at a specific position

pub fn pos(&self) -> usize

Current position in the buffer

pub fn set_pos(&mut self, pos: usize)

Set position (used after buffer operations)

pub fn finalize_at_eof(&mut self, buf: &[u8]) -> Result<SpannedToken, ScanError>

Finalize any pending token at true EOF.

Call this when the scanner returned NeedMore but no more data is available. Returns the completed token if one is pending (e.g., a number at EOF), or an error if the token is incomplete (e.g., unterminated string).

pub fn next_token(&mut self, buf: &[u8]) -> Result<SpannedToken, ScanError>

Scan the next token from the buffer.

Returns Token::NeedMore if the buffer is exhausted mid-token, allowing the caller to refill and retry.

Trait Implementations

impl Default for Scanner

fn default() -> Self

Returns the “default value” for a type.