feat: more structured way to accesn urlencs builder.

urlenc/build.go

@@ -1,14 +1,35 @@
 package urlenc
 
-import "strings"
 import "fmt"
+import "net/url"
 
-type Pair[V any] struct {
+type Values = url.Values
+
+type Builder interface {
+	BuildQueryValues() Values
+}
+
+type Value[V any] struct {
 	Name string
 	Value V
 }
-func (a Pair[V]) String() string {
-	return fmt.Sprintf("%s=%v", a.Name, a.Value)
+func (value Value[V]) BuildQueryValues() Values {
+	values := Values{}
+	values.Add(
+		value.Name,
+		fmt.Sprintf("%v", value.Value),
+	)
+	return values
+}
+
+func (value Value[V]) String() string {
+	unesc, err := url.QueryUnescape(
+		value.BuildQueryValues().Encode(),
+	)
+	if err != nil {
+		panic(err)
+	}
+	return unesc
 }
 
 type Array[V any] struct {
@@ -16,21 +37,35 @@ type Array[V any] struct {
 	Values []V
 }
 
-func (a Array[V]) String() string {
-	var b strings.Builder
+func (a Array[V]) BuildQueryValues() Values {
+	values := Values{}
 	for i, v := range a.Values {
-		fmt.Fprintf(&b, "%s[%d]=%v", a.Name, i, v)
-		if i < len(a.Values) - 1 {
-			fmt.Fprint(&b, "&")
-		}
+		values.Add(
+			fmt.Sprintf("%s[%d]", a.Name, i),
+			fmt.Sprintf("%v", v),
+		)
 	}
-	return b.String()
+	return values
 }
 
-func Join(values ...any) string {
-	vs := make([]string, len(values))
-	for i, v := range values {
-		vs[i] = fmt.Sprintf("%s", v)
+func (a Array[V]) String() string {
+	unesc, err := url.QueryUnescape(
+		a.BuildQueryValues().Encode(),
+	)
+	if err != nil {
+		panic(err)
 	}
-	return strings.Join(vs, "&")
+	return unesc
+}
+
+func Join(builders ...Builder) Values {
+	ret := Values{}
+	for _, builder := range builders {
+		for k, v := range builder.BuildQueryValues() {
+			for _, jv := range v {
+				ret.Add(k, jv)
+			}
+		}
+	}
+	return ret
 }

urlenc/build_test.go

@@ -4,20 +4,24 @@ import "testing"
 import "log"
 
 func TestArray(t *testing.T) {
-	log.Printf("Array{...}: %s\n", Array[int]{
-		Name: "id",
-		Values: []int{123, 456, 789},
-	})
+	log.Printf(
+		"Array{...}: %s\n",
+		Array[int]{
+			Name: "id",
+			Values: []int{123, 456, 789},
+		},
+	)
 }
 
 func TestJoin(t *testing.T) {
 	log.Printf(
+		"Join(...): %s",
 		Join(
 			Array[int]{
 				"id",
 				[]int{123, 456, 789},
 			},
-			Pair[int]{"somename", 25},
-		),
+			Value[string]{"somename", "value with '='"},
+		).Encode(),
 	)
 }