Enum Expr

pub enum Expr {
    Char(Loc<char>),
    String(Loc<String>),
    Name(Loc<String>),
    Round(Round),
    Function(Option<Loc<String>>, Loc<Round>, MaybeExpr, Option<Brace>),
    Op(MaybeExpr, Loc<Op>, MaybeExpr),
    Field(MaybeExpr, Loc<String>),
    Call(MaybeExpr, Loc<Round>),
}

Represents a Welly expression.

Examples:

• 3
• "hello"
• p.x ** 2 + p.y ** 2
• object.method(arg1, arg2)

In Welly’s grammar it is impossible for two Exprs to be adjacent. Therefore, we can make all Exprs optional without ambiguity. We do this in the hope of reporting more helpful errors.

Variants

Char(Loc<char>)

A literal character value.

String(Loc<String>)

A literal string value.

Name(Loc<String>)

An identifier or literal number value.

Round(Round)

Comma-separated Exprs in round brackets.

Function(Option<Loc<String>>, Loc<Round>, MaybeExpr, Option<Brace>)

A function or function type literal.

Op(MaybeExpr, Loc<Op>, MaybeExpr)

A keyword operator applied to zero, one or two operands.

Field(MaybeExpr, Loc<String>)

Field access.

Call(MaybeExpr, Loc<Round>)

Function or macro call.

Trait Implementations

impl Debug for Expr

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

Formats the value using the given formatter.

impl Tree for Expr

fn declare_keywords(declare: impl FnMut(&'static str, Self))

where Self: Sized,

declare() all the keywords whose parse trees are Selfs.