Struct piston_meta::meta_rules::Optional
[−]
[src]
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[src]
fn parse(
&self,
tokens: &mut Vec<Range<MetaData>>,
state: &TokenizerState,
read_token: &ReadToken,
refs: &[Rule]
) -> (Range, TokenizerState, Option<Range<ParseError>>)
&self,
tokens: &mut Vec<Range<MetaData>>,
state: &TokenizerState,
read_token: &ReadToken,
refs: &[Rule]
) -> (Range, TokenizerState, Option<Range<ParseError>>)
Parse optional. Returns the old state if any sub rule fails.
Trait Implementations
impl Clone for Optional[src]
fn clone(&self) -> Optional
Returns a copy of the value. Read more
fn clone_from(&mut self, source: &Self)1.0.0
Performs copy-assignment from source. Read more