Trait LayerExt 

pub trait LayerExt<'i, O>: Parser<Input<'i>, O, ErrMode<ParseStack<'i>>> + Sized {
    // Provided method
    fn layer(self, name: impl Into<String>) -> LayerParser<Self> { ... }
}

Extension trait that adds a LayerExt::layer function to all parsers

Calling layer allows creation of nested LayerParser on any parser over the Input type.

A layer acts as a boundary of the currently parsed unit of “grammar”. All context errors since the last layer (if existing) are bound to this layer.

Note

The order in which Parser::context and layer functions are called is important! A layer contains all context calls that were called beforehand.

Any context calls after layer will be part of the next layer.

Example

use alpm_parsers::prelude::*;
use winnow::ascii::alphanumeric1;

let mut parser = alphanumeric1.label("alphanumeric number").layer("version");

parser.parse(Input::new("a1"))?;

Provided Methods

fn layer(self, name: impl Into<String>) -> LayerParser<Self>

Wraps this parser in a named nesting layer.

On failure any pending context messages are moved into a named layer, spanning from where the parser started to where it failed.

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

Implementors

impl<'i, O, P> LayerExt<'i, O> for P

where P: Parser<Input<'i>, O, ErrMode<ParseStack<'i>>>,