// AskExpr takes an expression and an Asker. It then parses the expression
// calling the Asker's Ask on expressions AskNodes and returns if the
// expression is true or not for the given asker.
func AskExpr(expr string, asker Asker) (bool, error) {
q, err := parse.Parse(expr)
if err != nil {
return false, err
}
return walk(q.Root, asker)
}
// Parse parses an expression and returns the parsed expression.
// It can be used wtih AskParsedExpr
func Parse(text string) (*Tree, error) {
tree := &Tree{}
if text == "" {
tree.Tree = &parse.Tree{}
return tree, nil
}
var err error
tree.Tree, err = parse.Parse(text)
return tree, err
}