Enum WhenExpr 

pub enum WhenExpr {
    Literal(Value),
    Ident {
        ns: Namespace,
        name: String,
    },
    Call {
        ns: Namespace,
        method: String,
        args: Vec<WhenExpr>,
    },
    Not(Box<WhenExpr>),
    And(Box<WhenExpr>, Box<WhenExpr>),
    Or(Box<WhenExpr>, Box<WhenExpr>),
    Cmp {
        left: Box<WhenExpr>,
        op: CmpOp,
        right: Box<WhenExpr>,
    },
    Matches {
        left: Box<WhenExpr>,
        pattern: Regex,
    },
    List(Vec<WhenExpr>),
}

Variants

Literal(Value)

Ident

Fields

ns: Namespace

name: String

Call

<ns>.<method>(args...). Currently only the iter namespace exposes callable methods; an unknown (namespace, method) pair is rejected at parse time so typos don’t silently coerce to null like value-style idents do.

Fields

ns: Namespace

method: String

args: Vec<WhenExpr>

Not(Box<WhenExpr>)

And(Box<WhenExpr>, Box<WhenExpr>)

Or(Box<WhenExpr>, Box<WhenExpr>)

Cmp

Fields

left: Box<WhenExpr>

op: CmpOp

right: Box<WhenExpr>

Matches

left matches <compiled regex> — RHS is compiled at parse time.

Fields

left: Box<WhenExpr>

pattern: Regex

List(Vec<WhenExpr>)

Implementations

impl WhenExpr

pub fn evaluate(&self, env: &WhenEnv<'_>) -> Result<bool, WhenError>

Trait Implementations

impl Clone for WhenExpr

fn clone(&self) -> WhenExpr

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for WhenExpr

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

Formats the value using the given formatter.