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definition.go
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definition.go
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package msgproc
import (
"fmt"
"reflect"
"strconv"
"strings"
"time"
rmsg "github.com/bluenviron/goroslib/v2/pkg/msg"
)
type def struct {
name string
body string
}
// Definition returns the definition of a message and of all its parents.
func Definition(msg interface{}) (string, error) {
msgt := reflect.TypeOf(msg)
if msgt.Kind() != reflect.Struct {
return "", fmt.Errorf("message must be a struct")
}
defsByName := make(map[string]struct{})
var defs []def
err := definitionMsg(defsByName, &defs, msgt)
if err != nil {
return "", err
}
// main message
ret := defs[len(defs)-1].body + "\n"
// parent messages
for i := len(defs) - 2; i >= 0; i-- {
ret += strings.Repeat("=", 80) + "\n"
ret += "MSG: " + defs[i].name + "\n"
ret += defs[i].body + "\n"
}
return ret, nil
}
func definitionMsg(defsByName map[string]struct{}, defs *[]def, msgt reflect.Type) error {
body := ""
nf := msgt.NumField()
for i := 0; i < nf; i++ {
ft := msgt.Field(i)
if ft.Anonymous && ft.Type == reflect.TypeOf(rmsg.Package(0)) {
continue
}
if ft.Anonymous && ft.Type == reflect.TypeOf(rmsg.Name(0)) {
continue
}
if ft.Anonymous && ft.Type == reflect.TypeOf(rmsg.Definitions(0)) {
for _, def := range strings.Split(ft.Tag.Get("ros"), ",") {
body += def + "\n"
}
continue
}
name := func() string {
tagName := ft.Tag.Get("rosname")
if tagName != "" {
return tagName
}
return camelToSnake(ft.Name)
}()
text, err := definitionField(defsByName, defs, ft.Type, ft.Tag.Get("rostype"))
if err != nil {
return err
}
body += text + " " + name + "\n"
}
msgType := getType(msgt)
if _, ok := defsByName[msgType]; !ok {
defsByName[msgType] = struct{}{}
*defs = append(*defs, def{
name: msgType,
body: body,
})
}
return nil
}
func definitionField(defsByName map[string]struct{}, defs *[]def, fieldt reflect.Type,
rosTag string,
) (string, error) {
switch fieldt {
case reflect.TypeOf(bool(false)):
return "bool", nil
case reflect.TypeOf(int8(0)):
if rosTag == "byte" {
return "byte", nil
}
return "int8", nil
case reflect.TypeOf(uint8(0)):
if rosTag == "char" {
return "char", nil
}
return "uint8", nil
case reflect.TypeOf(int16(0)):
return "int16", nil
case reflect.TypeOf(uint16(0)):
return "uint16", nil
case reflect.TypeOf(int32(0)):
return "int32", nil
case reflect.TypeOf(uint32(0)):
return "uint32", nil
case reflect.TypeOf(int64(0)):
return "int64", nil
case reflect.TypeOf(uint64(0)):
return "uint64", nil
case reflect.TypeOf(float32(0)):
return "float32", nil
case reflect.TypeOf(float64(0)):
return "float64", nil
case reflect.TypeOf(string("")):
return "string", nil
case reflect.TypeOf(time.Time{}):
return "time", nil
case reflect.TypeOf(time.Duration(0)):
return "duration", nil
}
switch fieldt.Kind() {
case reflect.Slice:
def, err := definitionField(defsByName, defs, fieldt.Elem(), "")
if err != nil {
return "", err
}
return def + "[]", nil
case reflect.Array:
def, err := definitionField(defsByName, defs, fieldt.Elem(), "")
if err != nil {
return "", err
}
return def + "[" + strconv.FormatInt(int64(fieldt.Len()), 10) + "]", nil
case reflect.Struct:
err := definitionMsg(defsByName, defs, fieldt)
if err != nil {
return "", err
}
return getType(fieldt), nil
}
return "", fmt.Errorf("unsupported field type '%s'", fieldt.String())
}