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bind_decode.go
110 lines (93 loc) · 2.07 KB
/
bind_decode.go
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package pi
import (
"errors"
"fmt"
"net/url"
"reflect"
"strconv"
)
var (
ErrInvalidP = errors.New("p must be *T")
)
var fmap = make(map[any]map[int]string)
var tmap = make(map[any]map[int]reflect.StructField)
func decode(m url.Values, v reflect.Value) error {
if v.Type().Kind() == reflect.Interface || v.Type().Kind() == reflect.Pointer {
v = v.Elem()
}
if v.Kind() != reflect.Struct {
return ErrInvalidP
}
t := v.Type()
if v, ok := fmap[t]; !ok {
fmap[t] = make(map[int]string)
} else {
if len(v) != t.NumField() {
fmap[t] = make(map[int]string)
}
}
if _, ok := tmap[t]; !ok {
tmap[t] = make(map[int]reflect.StructField)
}
for i := 0; i < v.NumField(); i++ {
tf, ok := tmap[t][i]
if !ok {
tf = t.Field(i)
tmap[t][i] = tf
}
vf := v.Field(i)
if !tf.Anonymous && !vf.CanSet() {
continue
}
if tf.Anonymous {
// must be a struct
err := decode(m, vf)
if err != nil {
return err
}
continue
}
query, ok := fmap[t][i]
if !ok {
query, ok = tf.Tag.Lookup("query")
if !ok {
query = tf.Name
}
fmap[t][i] = query
}
if query == "-" {
continue
}
switch vf.Kind() {
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
n, err := strconv.ParseInt(m.Get(query), 10, 64)
if err != nil {
return fmt.Errorf("parse %s to int: %w", query, err)
}
vf.SetInt(n)
case reflect.String:
vf.SetString(m.Get(query))
case reflect.Float32, reflect.Float64:
n, err := strconv.ParseFloat(m.Get(query), 64)
if err != nil {
return fmt.Errorf("parse %s to float: %w", query, err)
}
vf.SetFloat(n)
case reflect.Bool:
b, _ := strconv.ParseBool(m.Get(query))
vf.SetBool(b)
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
n, err := strconv.ParseUint(m.Get(query), 10, 64)
if err != nil {
return fmt.Errorf("parse %s to uint: %w", query, err)
}
vf.SetUint(n)
case reflect.Struct:
err := decode(m, vf)
if err != nil {
return fmt.Errorf("parse %s to struct: %w", query, err)
}
}
}
return nil
}