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use crate::error::{xml_error, Error};
use crate::syntax::{
XML_ATTR_NAMESPACE, XML_DECL_VERSION, XML_ELEM_MAJOR, XML_ELEM_MINOR, XML_ELEM_SPEC_VERSION,
};
use crate::SpecVersion;
use quick_xml::events::{attributes::Attribute, BytesDecl, BytesEnd, BytesStart, BytesText, Event};
use quick_xml::Writer;
use std::io::Write;
#[derive(Debug)]
pub struct Element {
name: &'static [u8],
}
pub trait Writable<T: Write> {
fn write(&self, writer: &mut Writer<T>) -> Result<(), Error>;
}
pub trait RootWritable<T: Write>: Writable<T> {
fn write_root(&self, writer: T) -> Result<T, Error> {
let mut xml = Writer::new(writer);
start(&mut xml).map_err(xml_error)?;
self.write(&mut xml)?;
Ok(xml.into_inner())
}
}
pub fn start<T: Write>(writer: &mut Writer<T>) -> Result<(), quick_xml::Error> {
writer
.write_event(Event::Decl(BytesDecl::new(XML_DECL_VERSION, None, None)))
.map(|_| ())
}
pub fn element<T: Write>(
writer: &mut Writer<T>,
name: &'static [u8],
) -> Result<(), quick_xml::Error> {
writer.write_event(Event::Start(BytesStart::borrowed_name(name)))?;
writer
.write_event(Event::End(BytesEnd::borrowed(name)))
.map(|_| ())
}
pub fn start_element<T: Write>(
writer: &mut Writer<T>,
name: &'static [u8],
) -> Result<Element, quick_xml::Error> {
writer.write_event(Event::Start(BytesStart::borrowed_name(name)))?;
Ok(Element { name })
}
pub fn start_ns_element<T: Write>(
writer: &mut Writer<T>,
name: &'static [u8],
namespace: &'static str,
prefix: Option<&str>,
) -> Result<Element, quick_xml::Error> {
let xmlns = [
XML_ATTR_NAMESPACE,
if prefix.is_some() { ":" } else { "" },
if let Some(p) = prefix { p } else { "" },
]
.concat();
start_element_with(writer, name, vec![(xmlns.as_str(), namespace)])?;
Ok(Element { name })
}
pub fn start_element_with<T: Write>(
writer: &mut Writer<T>,
name: &'static [u8],
attrs: Vec<(&str, &str)>,
) -> Result<Element, quick_xml::Error> {
let mut element = BytesStart::borrowed_name(name);
for (name, value) in attrs {
element.push_attribute(Attribute::from((name, value)));
}
writer.write_event(Event::Start(element))?;
Ok(Element { name })
}
pub fn end_element<T: Write>(writer: &mut Writer<T>, name: &[u8]) -> Result<(), quick_xml::Error> {
writer
.write_event(Event::End(BytesEnd::borrowed(name)))
.map(|_| ())
}
pub fn text_element<T: Write>(
writer: &mut Writer<T>,
name: &'static [u8],
content: &[u8],
) -> Result<(), quick_xml::Error> {
let element = start_element(writer, name)?;
writer.write_event(Event::Text(BytesText::from_plain(content)))?;
element.end(writer)
}
impl Element {
pub fn end<T: Write>(&self, writer: &mut Writer<T>) -> Result<(), quick_xml::Error> {
end_element(writer, self.name)
}
}
impl<T: Write> Writable<T> for SpecVersion {
fn write(&self, writer: &mut Writer<T>) -> Result<(), Error> {
let spec_version = start_element(writer, XML_ELEM_SPEC_VERSION).map_err(xml_error)?;
text_element(
writer,
XML_ELEM_MAJOR,
match self {
SpecVersion::V10 => "1",
SpecVersion::V11 => "1",
SpecVersion::V20 => "2",
}
.as_bytes(),
)
.map_err(xml_error)?;
text_element(
writer,
XML_ELEM_MINOR,
match self {
SpecVersion::V10 => "0",
SpecVersion::V11 => "1",
SpecVersion::V20 => "0",
}
.as_bytes(),
)
.map_err(xml_error)?;
spec_version.end(writer).map_err(xml_error)
}
}
