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
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fn parse(&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 PartialEq for Optional
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fn eq(&self, __arg_0: &Optional) -> bool
This method tests for self
and other
values to be equal, and is used by ==
. Read more
fn ne(&self, __arg_0: &Optional) -> bool
This method tests for !=
.
impl Debug for Optional
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impl Clone for Optional
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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