File size: 1,611 Bytes
1e92f2d |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 |
package twiml
import (
"encoding/xml"
"fmt"
)
// Iterator will iterate over the verbs in a TwiML document,
// in the order they should be processed.
//
// A Say verb within a Gather verb will be processed before
// the Gather verb itself.
type Iterator struct {
state Verb
verbs []Verb
}
// NewIterator returns a new Iterator.
func NewIterator() *Iterator {
return &Iterator{}
}
// SetResponse sets the response to interpret, and resets the state.
//
// This method will return an error if the response is not valid TwiML.
func (i *Iterator) SetResponse(data []byte) error {
var rsp Response
if err := xml.Unmarshal(data, &rsp); err != nil {
return err
}
i.verbs = append(i.verbs[:0], rsp.Verbs...)
i.state = nil
return nil
}
// Verb returns the current verb.
func (i *Iterator) Verb() Verb { return i.state }
// Next advances the iterator to the next verb
// and returns true if there is another verb.
func (i *Iterator) Next() bool {
if len(i.verbs) == 0 {
return false
}
switch t := i.verbs[0].(type) {
case *Hangup, *Redirect, *Reject:
// end the call
i.state = t
i.verbs = nil
case *Gather:
if len(t.Verbs) == 0 {
i.state = t
i.verbs = i.verbs[1:]
break
}
newVerbs := make([]Verb, 0, len(t.Verbs)+len(i.verbs))
i.state = t.Verbs[0]
for _, v := range t.Verbs[1:] {
newVerbs = append(newVerbs, v)
}
t.Verbs = nil
newVerbs = append(newVerbs, t)
newVerbs = append(newVerbs, i.verbs[1:]...)
i.verbs = newVerbs
case *Pause, *Say:
i.state = t
i.verbs = i.verbs[1:]
default:
panic(fmt.Sprintf("unhandled verb: %T", t))
}
return true
}
|