Struct piston_meta::Optional

pub struct Optional {
    pub rule: Rule,
    pub debug_id: DebugId,
}

Stores information about optional.

Fields

rule: Rule

The optional rule.

debug_id: DebugId

A debug id to track down the rule generating an error.

Methods

impl Optional

fn parse(&self, tokenizer: &mut Tokenizer, state: &TokenizerState, chars: &[char], offset: usize, refs: &[(Rc<String>, Rule)]) -> (Range, TokenizerState, Option<(Range, ParseError)>)

Parse optional. Returns the old state if any sub rule fails.

Trait Implementations

impl PartialEq for Optional

fn eq(&self, __arg_0: &Optional) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, __arg_0: &Optional) -> bool

This method tests for !=.

impl Debug for Optional

fn fmt(&self, __arg_0: &mut Formatter) -> Result

Formats the value using the given formatter.

impl Clone for Optional

fn clone(&self) -> Optional

Returns a copy of the value.

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

Performs copy-assignment from source.