Struct CanonicalScanner 

pub struct CanonicalScanner<'a> { /* private fields */ }

A zero-allocation recognizer for a known canonical JSON layout.

This is not a general JSON parser. It is an optimization primitive for generated or protocol-specific code that first attempts one exact layout and falls back to crate::JsonCursor when any expectation does not match. Every successful recognizer must consume and check the complete input.

Implementations

impl<'a> CanonicalScanner<'a>

pub const fn new(input: &'a str) -> Self

Starts matching an already UTF-8-validated string.

pub fn literal(&mut self, expected: &str) -> Option<()>

Consumes an exact string fragment.

Returns None without advancing when the sequence does not match.

pub fn plain_string(&mut self) -> Option<&'a str>

Consumes a JSON string with no escapes and returns its borrowed value.

Escaped strings deliberately return None so the caller can use the general parser instead.

pub fn unsigned(&mut self) -> Option<u64>

Consumes one unsigned JSON integer.

pub fn boolean(&mut self) -> Option<bool>

Consumes true or false.

pub const fn remaining(&self) -> &'a str

Returns the unmatched suffix.

pub const fn is_finished(&self) -> bool

Returns true only when the recognizer consumed the complete input.

Trait Implementations

impl<'a> Clone for CanonicalScanner<'a>

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

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<'a> Copy for CanonicalScanner<'a>

impl<'a> Debug for CanonicalScanner<'a>

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

Formats the value using the given formatter.