Method compileCall

compiler/rungen/expr.go:249–270

(call *dag.CallExpr)

}

func (b *Builder) compileCall(call *dag.CallExpr) (expr.Evaluator, error) {
	// First check if call is to a user defined function, otherwise check for
	// builtin function.
	var fn expr.Function
	if f, ok := b.funcs[call.Tag]; ok {
		var err error
		if fn, err = b.compileUDFCall(call.Tag, f); err != nil {
			return nil, err
		}
	} else {
		var err error
		fn, err = function.New(b.sctx(), call.Tag, len(call.Args))
		if err != nil {
			return nil, fmt.Errorf("%s: %w", call.Tag, err)
		}
	}
	exprs, err := b.compileExprs(call.Args)
	if err != nil {
		return nil, fmt.Errorf("%s: bad argument: %w", call.Tag, err)
	}
	return expr.NewCall(fn, exprs), nil
}

func (b *Builder) compileUDFCall(tag string, f *dag.FuncDef) (expr.Function, error) {
	if fn, ok := b.compiledUDFs[tag]; ok { //XXX this doesn't work for stateful things