Method evalAtCompileTime

compiler/rungen/op.go:625–641

(in dag.Expr)

}

func (b *Builder) evalAtCompileTime(in dag.Expr) (val super.Value, err error) {
	if in == nil {
		return super.Null, nil
	}
	e, err := b.compileExpr(in)
	if err != nil {
		return super.Null, err
	}
	// Catch panic as the runtime will panic if there is a
	// reference to a var not in scope, a field access null this, etc.
	defer func() {
		if recover() != nil {
			val = b.sctx().Missing()
		}
	}()
	return e.Eval(b.sctx().Missing()), nil
}

func compileExpr(in dag.Expr) (expr.Evaluator, error) {
	b := NewBuilder(runtime.NewContext(context.Background(), super.NewContext()), nil)