Enum FeatureExpr 

pub enum FeatureExpr {
    Form(FeatureForm),
    ByteClass {
        negated: bool,
        items: Vec<ByteClassItem>,
    },
    UnicodeClass {
        negated: bool,
        items: Vec<UnicodeClassItem>,
    },
    Call {
        name: String,
        arguments: Vec<GrammarExpr>,
    },
}

An expression of the grammar feature union.

Variants

Form(FeatureForm)

A form of FEATURE_EXPRESSION_FORMS.

ByteClass

A class of bytes, byteClass or notByteClass.

Fields

negated: bool

Whether the class is negated.

items: Vec<ByteClassItem>

Bytes and byte ranges of the class.

UnicodeClass

A character class with at least one Unicode category or script item.

Fields

negated: bool

Whether the class is negated.

items: Vec<UnicodeClassItem>

Characters, ranges, categories and scripts of the class.

Call

A call of a parameterized rule, ref(NAME, ARGUMENT, ...).

Fields

name: String

The called rule.

arguments: Vec<GrammarExpr>

The arguments, at least one.

Implementations

impl FeatureExpr

pub fn head(&self) -> &str

The head word of this expression in the native listing.

pub fn for_each_expression<'a>( &'a self, visit: &mut impl FnMut(&'a GrammarExpr), )

Every grammar expression this one holds directly, operations included.

pub fn map_expressions(&mut self, map: &mut impl FnMut(&mut GrammarExpr))

Rewrites every grammar expression this one holds directly.

Trait Implementations

impl Clone for FeatureExpr

fn clone(&self) -> FeatureExpr

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for FeatureExpr

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

Formats the value using the given formatter.

impl Eq for FeatureExpr

impl PartialEq for FeatureExpr

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for FeatureExpr