(Swift 2) Find and Update an XML Attribute Value

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Demonstrates how to find an element in XML with a specified attribute name and then update the attribute value.

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func chilkatTest() {
    // Let's say you have 2 XML files with identical structures as shown directly below,
    // and you wish to update the values in the 1st XML file with those in the 2nd XML file.

    // <global>
    //     <phrase id="2FADisabled" value="2factor authentication disabled"/>
    //     <phrase id="2FAEnabled" value="2factor authentication enabled"/>
    //     <phrase id="2FAResetFailed" value="Failed to disable two factor authentication"/>
    // </global>

    // <global>
    //     <phrase id="2FAResetFailed" value="Failed to reset two factor authentication"/>
    //     <phrase id="2FADisabled" value="2FA authentication disabled"/>
    //     <phrase id="2FAEnabled" value="2FA authentication enabled"/>
    // </global>

    // First, initialize each of the Chilkat XML objects.
    // These could be loaded from files, but we'll just create them manually for this example..

    let xml1 = CkoXml()
    xml1.Tag = "global"
    xml1.UpdateAttrAt("phrase", autoCreate: true, attrName: "id", attrValue: "2FADisabled")
    xml1.UpdateAttrAt("phrase", autoCreate: true, attrName: "value", attrValue: "2factor authentication disabled")
    xml1.UpdateAttrAt("phrase[1]", autoCreate: true, attrName: "id", attrValue: "2FAEnabled")
    xml1.UpdateAttrAt("phrase[1]", autoCreate: true, attrName: "value", attrValue: "2factor authentication enabled")
    xml1.UpdateAttrAt("phrase[2]", autoCreate: true, attrName: "id", attrValue: "2FAResetFailed")
    xml1.UpdateAttrAt("phrase[2]", autoCreate: true, attrName: "value", attrValue: "Failed to disable two factor authentication")

    let xml2 = CkoXml()
    xml2.Tag = "global"
    xml2.UpdateAttrAt("phrase", autoCreate: true, attrName: "id", attrValue: "2FAResetFailed")
    xml2.UpdateAttrAt("phrase", autoCreate: true, attrName: "value", attrValue: "Failed to reset two factor authentication")
    xml2.UpdateAttrAt("phrase[1]", autoCreate: true, attrName: "id", attrValue: "2FADisabled")
    xml2.UpdateAttrAt("phrase[1]", autoCreate: true, attrName: "value", attrValue: "2FA authentication disabled")
    xml2.UpdateAttrAt("phrase[2]", autoCreate: true, attrName: "id", attrValue: "2FAEnabled")
    xml2.UpdateAttrAt("phrase[2]", autoCreate: true, attrName: "value", attrValue: "2FA authentication enabled")

    // Iterate over attribute values in xml2 and update the same in xml1.

    var phrase_id: String?
    var phrase_value: String?

    let sbPath = CkoStringBuilder()

    var i: Int = 0
    var count_i: Int = xml2.NumChildrenHavingTag("phrase").intValue
    while i < count_i {
        xml2.I = i
        phrase_id = xml2.ChilkatPath("phrase[i]|(id)")
        phrase_value = xml2.ChilkatPath("phrase[i]|(value)")

        // Notice how the UpdateAttrAt method's 1st argument is a Chilkat path -- which is an expression
        // to find the location of the XML element to be updated.
        // Here we create a path of the form "/A/tagName,attributeName,attributeValuePattern", which means
        // find the direct descendent of xml2 having tag=tagName, with an attribute=attributeName where the attribute value
        // matches the attributeValuePattern.  If attributeValuePattern does not contain a "*", then it must match directly.
        // We'll build a Chilkat path such as "/A/phrase,id,2FADisabled"
        sbPath.SetString("/A/phrase,id,")
        sbPath.Append(phrase_id)

        // This assumes the corresponding element exists in xml1.
        xml1.UpdateAttrAt(sbPath.GetAsString(), autoCreate: true, attrName: "value", attrValue: phrase_value)

        i = i + 1
    }

    // Now see how xml1 has been updated..
    print("\(xml1.GetXml())")

}