// actually produce (and possibly write) the final output
func (style *Stylesheet) constructOutput(output *xml.XmlDocument, options StylesheetOptions) (out string, err error) {
//if not explicitly set, spec requires us to check for html
outputType := style.OutputMethod
if outputType == "" {
outputType = "xml"
root := output.Root()
if root != nil && root.Name() == "html" && root.Namespace() == "" {
outputType = "html"
}
}
// construct DTD declaration depending on xsl:output settings
docType := ""
if style.doctypeSystem != "" {
docType = "<!DOCTYPE "
docType = docType + output.Root().Name()
if style.doctypePublic != "" {
docType = docType + fmt.Sprintf(" PUBLIC \"%s\"", style.doctypePublic)
} else {
docType = docType + " SYSTEM"
}
docType = docType + fmt.Sprintf(" \"%s\"", style.doctypeSystem)
docType = docType + ">\n"
}
// create the XML declaration depending on xsl:output settings
decl := ""
if outputType == "xml" {
if !style.OmitXmlDeclaration {
decl = style.constructXmlDeclaration()
}
format := xml.XML_SAVE_NO_DECL | xml.XML_SAVE_AS_XML
if options.IndentOutput || style.IndentOutput {
format = format | xml.XML_SAVE_FORMAT
}
// we get slightly incorrect output if we call out.SerializeWithFormat directly
// this seems to be a libxml bug; we work around it the same way libxslt does
//TODO: honor desired encoding
// this involves decisions about supported encodings, strings vs byte slices
// we can sidestep a little if we enable option to write directly to file
for cur := output.FirstChild(); cur != nil; cur = cur.NextSibling() {
b, size := cur.SerializeWithFormat(format, nil, nil)
if b != nil {
out = out + string(b[:size])
}
}
if out != "" {
out = decl + docType + out + "\n"
}
}
if outputType == "html" {
out = docType
b, size := output.ToHtml(nil, nil)
out = out + string(b[:size])
}
if outputType == "text" {
format := xml.XML_SAVE_NO_DECL
for cur := output.FirstChild(); cur != nil; cur = cur.NextSibling() {
b, size := cur.SerializeWithFormat(format, nil, nil)
if b != nil {
out = out + string(b[:size])
}
}
}
return
}
