func pushExpression(expression *parser.Node, table *SymbolTable) string {
if expression == nil {
panic("argument must not be nil")
}
if expression.Name != "expression" {
panic(fmt.Sprintf("argument must be `expression`, but actual: %v", expression.ToXML()))
}
leftTerm, _ := expression.Find(&parser.Node{Name: "term"})
result := compileTerm(leftTerm, table)
if len(expression.Children) > 1 {
operator := expression.Children[1]
expression.Children = expression.Children[2:]
result += pushExpression(expression, table)
result += compileOperator(operator.Value)
}
return result
}
