Enum pest_meta::parser::ParserExpr

pub enum ParserExpr<'i> {
    Str(String),
    Insens(String),
    Range(String, String),
    Ident(String),
    PeekSlice(i32, Option<i32>),
    PosPred(Box<ParserNode<'i>>),
    NegPred(Box<ParserNode<'i>>),
    Seq(Box<ParserNode<'i>>, Box<ParserNode<'i>>),
    Choice(Box<ParserNode<'i>>, Box<ParserNode<'i>>),
    Opt(Box<ParserNode<'i>>),
    Rep(Box<ParserNode<'i>>),
    RepOnce(Box<ParserNode<'i>>),
    RepExact(Box<ParserNode<'i>>, u32),
    RepMin(Box<ParserNode<'i>>, u32),
    RepMax(Box<ParserNode<'i>>, u32),
    RepMinMax(Box<ParserNode<'i>>, u32, u32),
    Push(Box<ParserNode<'i>>),
}

All possible parser expressions

Variants

Str(String)

Matches an exact string, e.g. "a"

Insens(String)

Matches an exact string, case insensitively (ASCII only), e.g. ^"a"

Range(String, String)

Matches one character in the range, e.g. 'a'..'z'

Ident(String)

Matches the rule with the given name, e.g. a

PeekSlice(i32, Option<i32>)

Matches a custom part of the stack, e.g. PEEK[..]

PosPred(Box<ParserNode<'i>>)

Positive lookahead; matches expression without making progress, e.g. &e

NegPred(Box<ParserNode<'i>>)

Negative lookahead; matches if expression doesn’t match, without making progress, e.g. !e

Seq(Box<ParserNode<'i>>, Box<ParserNode<'i>>)

Matches a sequence of two expressions, e.g. e1 ~ e2

Choice(Box<ParserNode<'i>>, Box<ParserNode<'i>>)

Matches either of two expressions, e.g. e1 | e2

Opt(Box<ParserNode<'i>>)

Optionally matches an expression, e.g. e?

Rep(Box<ParserNode<'i>>)

Matches an expression zero or more times, e.g. e*

RepOnce(Box<ParserNode<'i>>)

Matches an expression one or more times, e.g. e+

RepExact(Box<ParserNode<'i>>, u32)

Matches an expression an exact number of times, e.g. e{n}

RepMin(Box<ParserNode<'i>>, u32)

Matches an expression at least a number of times, e.g. e{n,}

RepMax(Box<ParserNode<'i>>, u32)

Matches an expression at most a number of times, e.g. e{,n}

RepMinMax(Box<ParserNode<'i>>, u32, u32)

Matches an expression a number of times within a range, e.g. e{m, n}

Push(Box<ParserNode<'i>>)

Matches an expression and pushes it to the stack, e.g. push(e)

Trait Implementations

impl<'i> Clone for ParserExpr<'i>

fn clone(&self) -> ParserExpr<'i>

Returns a copy of the value.

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

Performs copy-assignment from source.

impl<'i> Debug for ParserExpr<'i>

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

Formats the value using the given formatter.

impl<'i> PartialEq<ParserExpr<'i>> for ParserExpr<'i>

fn eq(&self, other: &ParserExpr<'i>) -> bool

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

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

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl<'i> Eq for ParserExpr<'i>

impl<'i> StructuralEq for ParserExpr<'i>

impl<'i> StructuralPartialEq for ParserExpr<'i>