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/* gonuts10.go - https://groups.google.com/forum/?fromgroups#!topic/golang-nuts/tf4aDQ1Hn_c
change:
<author>
<first-name effect_range="1999-2011">Sam</first-name>
<first-name effect_range="2012-">Kevin</first-name>
<last-name>Smith</last-name>
<full-name></full-name>
</author>
to:
<author>
<first-name effect_range="1999-2011">Sam</first-name>
<first-name effect_range="2012-">Kevin</first-name>
<last-name>Smith</last-name>
<full-name>Kevin Smith</full-name>
</author>
NOTE: sequence of elements NOT guaranteed due to use of map[string]interface{}.
Here we build the "full-name" element value from other values in the doc by selecting the
"first-name" value with the latest dates.
*/
package main
import (
"fmt"
"github.com/clbanning/mxj/v2"
)
var data = []byte(`
<author>
<first-name effect_range="1999-2011">Sam</first-name>
<first-name effect_range="2012-">Kevin</first-name>
<last-name>Smith</last-name>
<full-name></full-name>
</author>
`)
func main() {
m, err := mxj.NewMapXml(data)
if err != nil {
fmt.Println("NewMapXml err:", err)
return
}
// vals, err := m.ValuesForPath("author.first-name") // full-path option
vals, err := m.ValuesForKey("first-name") // key-only alternatively
if err != nil {
fmt.Println("ValuesForPath err:", err)
return
} else if len(vals) == 0 {
fmt.Println("no first-name vals")
return
}
var fname, date string
for _, v := range vals {
vm, ok := v.(map[string]interface{})
if !ok {
fmt.Println("assertion failed")
return
}
fn, ok := vm["#text"].(string)
if !ok {
fmt.Println("no #text tag")
return
}
dt, ok := vm["-effect_range"].(string)
if !ok {
fmt.Println("no -effect_range attr")
return
}
if dt > date {
date = dt
fname = fn
}
}
/*
// alternatively:
//(however, this requires knowing what latest "effect_range" attribute value is)
vals, err := m.ValuesForKey("first-name", "-effect_range:2012-")
if len(vals) == 0 {
fmt.Println("no #text vals")
return
}
fname := vals[0].(map[string]interface{})["#text"].(string)
*/
// vals, err = m.ValuesForKey("last-name") // key-only option
vals, err = m.ValuesForPath("author.last-name") // full-path option
if err != nil {
fmt.Println("ValuesForPath err:", err)
return
} else if len(vals) == 0 {
fmt.Println("no last-name vals")
return
}
lname := vals[0].(string)
if err = m.SetValueForPath(fname+" "+lname, "author.full-name"); err != nil {
fmt.Println("SetValueForPath err:", err)
return
}
b, err := m.XmlIndent("", " ")
if err != nil {
fmt.Println("XmlIndent err:", err)
return
}
fmt.Println(string(b))
}
|
