Struct piston_meta::meta_rules::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.

Implementations

impl Optional

pub fn parse(
    &self,
    tokens: &mut Vec<Range<MetaData>>,
    state: &TokenizerState,
    read_token: &ReadToken<'_>,
    refs: &[Rule],
    indent_settings: &mut IndentSettings
) -> (Range, TokenizerState, Option<Range<ParseError>>)

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

Trait Implementations

impl Clone for Optional

fn clone(&self) -> Optional

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for Optional

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

Formats the value using the given formatter.

impl PartialEq<Optional> for Optional

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

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

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

This method tests for !=.

impl StructuralPartialEq for Optional