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use xml::EventWriter;
use xml::writer::{EmitterConfig, XmlEvent};
pub use xml::writer::Error as XmlError;
pub struct XmlWriter<'a> {
w: EventWriter<&'a mut Vec<u8>>,
}
impl<'a> XmlWriter<'a> {
pub fn new(body: &'a mut Vec<u8>) -> XmlWriter<'a> {
let writer = EmitterConfig::new()
.perform_indent(true)
.write_document_declaration(false)
.create_writer(body);
XmlWriter{w: writer}
}
pub fn write(&mut self, text: &str) -> Result<(), XmlError> {
self.w.write(text)
}
pub fn start_element(&mut self, element: &str) -> Result<(), XmlError> {
self.w.write(XmlEvent::start_element(element))
}
pub fn end_element(&mut self) -> Result<(), XmlError> {
self.w.write(XmlEvent::end_element())
}
pub fn element<T: XmlSerializable>(&mut self, label: &str, content: &T) -> Result<(), XmlError> {
self.start_element(label)?;
content.write(self)?;
self.end_element()
}
pub fn element_opt<T: XmlSerializable>(&mut self, label: &str, content: &Option<T>) -> Result<(), XmlError> {
if let Some(ref content) = *content {
self.start_element(label)?;
content.write(self)?;
self.end_element()
} else {
Ok(())
}
}
pub fn array<T: XmlSerializable>(&mut self, array: &str, element: &str, items: &Vec<T>) -> Result<(), XmlError> {
self.start_element(array)?;
for item in items {
self.element(element, item)?;
}
self.end_element()
}
}
pub trait XmlSerializable {
fn write(&self, &mut XmlWriter) -> Result<(), XmlError>;
fn to_xml(&self) -> Result<String, XmlError> {
let mut body = Vec::new();
{
let mut writer = XmlWriter::new(&mut body);
self.write(&mut writer)?;
}
Ok(String::from_utf8(body).unwrap())
}
}
impl XmlSerializable for bool {
fn write(&self, xml: &mut XmlWriter) -> Result<(), XmlError> {
xml.write(match *self {true => "true", false => "false"})
}
}
impl XmlSerializable for i32 {
fn write(&self, xml: &mut XmlWriter) -> Result<(), XmlError> {
xml.write(&self.to_string())
}
}
impl XmlSerializable for i64 {
fn write(&self, xml: &mut XmlWriter) -> Result<(), XmlError> {
xml.write(&self.to_string())
}
}
impl XmlSerializable for u32 {
fn write(&self, xml: &mut XmlWriter) -> Result<(), XmlError> {
xml.write(&self.to_string())
}
}
impl XmlSerializable for u64 {
fn write(&self, xml: &mut XmlWriter) -> Result<(), XmlError> {
xml.write(&self.to_string())
}
}
impl XmlSerializable for f32 {
fn write(&self, xml: &mut XmlWriter) -> Result<(), XmlError> {
xml.write(&self.to_string())
}
}
impl XmlSerializable for f64 {
fn write(&self, xml: &mut XmlWriter) -> Result<(), XmlError> {
xml.write(&self.to_string())
}
}
impl<'a> XmlSerializable for &'a str {
fn write(&self, xml: &mut XmlWriter) -> Result<(), XmlError> {
xml.write(self)
}
}
impl XmlSerializable for String {
fn write(&self, xml: &mut XmlWriter) -> Result<(), XmlError> {
xml.write(&self)
}
}