Struct Ctx

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

A parsing context for UTF-8 input strings that can store error messages.

This context maintains a reference to the input data and optionally stores error information during parsing operations.

Implementations

impl<'a> Ctx<'a>

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

Creates a new parsing context from the given input string.

pub fn as_bytes(&self) -> &'a [u8]

Returns a byte slice containing the entire input.

pub fn as_str(&self) -> &'a str

Returns a string slice containing the entire input.

pub fn static_error(&mut self, err: &'static str)

Records an error message if no error is currently stored.

pub fn current_error(&self) -> Option<&str>

Returns the current error message, if any.

pub fn try_extend_lifetime(&self, text: &str) -> Option<&'a str>

Attempts to extend the lifetime of a text fragment if it belongs to the input buffer.

Example

let input = String::from("Hello, World!");
let ctx = Ctx::new(&input);
let slice = &input[0..5];

if let Some(extended) = ctx.try_extend_lifetime(slice) {
    assert_eq!(extended, "Hello");
}

Trait Implementations

impl<'a> Clone for Ctx<'a>

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

Returns a duplicate of the value.

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

Performs copy-assignment from source.