// Returns error if input is not valid according to the rules found in d.nouns
func (d *Descriptor) CreateInputs(filterCreator func(string, map[string]interface{}) (iface.Filter, error)) ([]interface{}, map[string]interface{}, error) {
module := mod.NewModule(d.VerbLocation)
if !module.Exists() {
return nil, nil, fmt.Errorf("Module named %v does not exist.", d.VerbLocation)
}
ins := module.Instance()
verb := ins.Method(d.Sentence.Verb)
an := verbinfo.NewAnalyzer(verb)
ac := an.ArgCount()
if len(d.Route.Queries) < ac {
return nil, nil, fmt.Errorf("Not enough input to supply.")
}
if ac == 0 {
return nil, nil, nil
}
fc := an.FilterCount()
if fc > 0 && filterCreator == nil {
return nil, nil, fmt.Errorf("filterCreator is needed but it is nil.")
}
var inp []interface{}
var data map[string]interface{}
source := []map[string]interface{}{}
for _, v := range d.Route.Queries {
source = append(source, v)
}
if an.NeedsData() {
data = source[len(source)-1]
if data == nil {
data = map[string]interface{}{} // !Important.
}
}
if fc > 0 {
if fc != 1 && len(source) != fc {
return nil, nil, fmt.Errorf("Got %v inputs, but method %v needs only %v filters. Currently filters can only be reduced to 1.", len(source), d.Sentence.Verb, fc)
}
filters := []iface.Filter{}
for i, v := range source {
if d.Sentence.Verb != "Get" && d.Sentence.Verb != "GetSingle" && i == len(source)-1 {
break
}
filt, err := filterCreator(d.Route.Words[i], v)
if err != nil {
return nil, nil, err
}
filters = append(filters, filt)
}
if len(filters) > 1 {
filter := filters[0]
red, err := filter.Reduce(filters[1:]...)
if err != nil {
return nil, nil, err
}
filters = []iface.Filter{red}
}
for _, v := range filters {
inp = append(inp, v)
}
}
return inp, data, nil
}
func moduleHasVerb(modname string, verbname string) bool {
mo := mod.NewModule(modname)
if !mo.Exists() {
return false
}
return mo.Instance().HasMethod(verbname)
}