Allow override for decoding simple element w/o attributes

It was an easy change to decode all simple elements values as map["#text":<value>] event if they do not have attributes.

xml.go

@@ -279,6 +279,23 @@ func HandleXMPPStreamTag(b ...bool) {
 	}
 }
 
+// 21jan18 - decode all values as map["#text":value] (issue #56)
+var decodeSimpleValuesAsMap bool
+
+// DecodeSimpleValuesAsMap forces all values to be decoded as map["#text":<value>].
+// If called with no argument, the decoding is toggled on/off.
+//
+// By default the NewMapXml functions decode simple values without attributes as
+// map[<tag>:<value>]. This function causes simple values without attributes to be
+// decoded the same as simple values with attributes - map[<tag>:map["#text":<value>]].
+func DecodeSimpleValuesAsMap(b ...bool) {
+	if len(b) == 0 {
+		decodeSimpleValuesAsMap = !decodeSimpleValuesAsMap
+	} else if len(b) == 1 {
+		decodeSimpleValuesAsMap = b[0]
+	}
+}
+
 // xmlToMapParser (2015.11.12) - load a 'clean' XML doc into a map[string]interface{} directly.
 // A refactoring of xmlToTreeParser(), markDuplicate() and treeToMap() - here, all-in-one.
 // We've removed the intermediate *node tree with the allocation and subsequent rescanning.
@@ -419,7 +436,7 @@ func xmlToMapParser(skey string, a []xml.Attr, p *xml.Decoder, r bool) (map[stri
 			// clean up possible noise
 			tt := strings.Trim(string(t.(xml.CharData)), "\t\r\b\n ")
 			if len(tt) > 0 {
-				if len(na) > 0 {
+				if len(na) > 0 || decodeSimpleValuesAsMap {
 					na["#text"] = cast(tt, r)
 				} else if skey != "" {
 					n[skey] = cast(tt, r)

xml3_test.go

@@ -45,3 +45,28 @@ func TestOnlyAttributesSeq(t *testing.T) {
 	}
 	fmt.Println(string(xml))
 }
+
+func TestDecodeSimpleValuesAsMap(t *testing.T) {
+	fmt.Println("========== TestDecodeSimpleValuesAsMap")
+	DecodeSimpleValuesAsMap()
+
+	xml := `<item>
+	<id>30102</id>
+	<title>Mini Drone Inteligente - Branco</title>
+	<price unit="BRL">149.90</price>
+</item>`
+	m, err := NewMapXml([]byte(xml))
+	if err != nil {
+		t.Fatal(err)
+	}
+	fmt.Println("xml:", string(xml))
+	fmt.Printf("m  : %v\n", m)
+
+	fmt.Println("========== (default)")
+	DecodeSimpleValuesAsMap()
+	m, err = NewMapXml([]byte(xml))
+	if err != nil {
+		t.Fatal(err)
+	}
+	fmt.Printf("m  : %v\n", m)
+}