Enum ParsePairExpression 

pub enum ParsePairExpression<'src> {
    Sort(Span, Box<ParsePairSort<'src>>),
    List(Span, Vec<ParsePairExpression<'src>>),
    Choice(Span, usize, Box<ParsePairExpression<'src>>),
    Empty(Span),
    Error(Span),
}

A parse pair is a way of representing an AST, without actually using any datatypes that depend on the language definition. This represents a parse pair for a constructor. Each constructor generates one of the variants of this enum.

Variants

Sort(Span, Box<ParsePairSort<'src>>)

This is generated when another sort is mentioned in the definition of this sort. That sort is parsed and the result is stored here.

List(Span, Vec<ParsePairExpression<'src>>)

This is generated when a list of constructors is executed. This can be generated by Sequence or Repeat.

Choice(Span, usize, Box<ParsePairExpression<'src>>)

This is generated when a Choice was made. The first argument is which choice was made, the second the parsed constructor.

Empty(Span)

This is generated when no useful information needed to be recorded here, but still a placeholder is needed to keep track of the span. Generated by Positive and Negative, as the actual values that were parsed in Positive and Negative are irrelevant. Generated by CharacterClass and Literal, as they don’t generate values.

Error(Span)

Implementations

impl<'src> ParsePairExpression<'src>

pub fn span(&self) -> Span

What span does this parse pair occupy?

Trait Implementations

impl<'src> Clone for ParsePairExpression<'src>

fn clone(&self) -> ParsePairExpression<'src>

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<'src> Debug for ParsePairExpression<'src>

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

Formats the value using the given formatter.

impl<'src> Display for ParsePairExpression<'src>

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

Formats the value using the given formatter.