Struct PrdError 

pub struct PrdError {
    pub err_message: String,
    pub token_index: usize,
    pub rule: u32,
    pub in_alt: u16,
    pub alt_progress: Option<u16>,
    pub on_behalf_of_rule: u32,
}

Parser error state.

Fields

err_message: String

Human-readable error message. Format is not guaranteed and may change arbitrarily.

token_index: usize

How far into the token stream did we successfully parse? Note: this is NOT

rule: u32

Which rule’s alternations were we inside of? (Index into bnf::Grammar::points)

in_alt: u16

Which alternation was it?

If u16::MAX, we errored out before entering an alternation.

If past the end of the grammar point’s list of alternations, then every alternation was checked and failed.

alt_progress: Option<u16>

Where were we inside of that alternation?

If “None”, we errored on a guard/lookahead test.

on_behalf_of_rule: u32

On behalf of what rule were we parsing for? (e.g. the parent of a $become)

Trait Implementations

impl Clone for PrdError

fn clone(&self) -> PrdError

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for PrdError

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

Formats the value using the given formatter.