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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: use NewMapXmlSeq() and mv.XmlSeqIndent() to preserve structure.
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"
"strings"
)
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() {
fmt.Println(string(data))
m, err := mxj.NewMapXmlSeq(data)
if err != nil {
fmt.Println("NewMapXml err:", err)
return
}
vals, err := m.ValuesForPath("author.first-name") // full-path option
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
var index int
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
}
// extract the associated date
dt, _ := mxj.Map(vm).ValueForPathString("#attr.effect_range.#text")
if dt == "" {
fmt.Println("no effect_range attr")
return
}
dts := strings.Split(dt, "-")
if len(dts) > 1 && dts[len(dts)-1] == "" {
index = len(dts) - 2
} else if len(dts) > 0 {
index = len(dts) - 1
}
if len(dts) > 0 && dts[index] > date {
date = dts[index]
fname = fn
}
}
vals, err = m.ValuesForPath("author.last-name.#text") // 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.#text"); err != nil {
fmt.Println("SetValueForPath err:", err)
return
}
b, err := m.XmlSeqIndent("", " ")
if err != nil {
fmt.Println("XmlIndent err:", err)
return
}
fmt.Println(string(b))
}
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