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use std::io::Read;
use xml::reader::{EventReader, XmlEvent, Error as XmlError};
use std;
use std::error::Error;
use xml::ParserConfig;
#[derive(Default, Debug)]
pub struct PropfindResponse {
pub href: String,
}
#[derive(Eq, PartialEq, Debug)]
pub enum PropfindParseError {
UnknownDocument,
InvalidFieldValue,
UnknownElement,
UnknownField,
ExpectedEndOfDocument,
Xml(XmlError),
}
impl From<XmlError> for PropfindParseError {
fn from(e: XmlError) -> Self {
PropfindParseError::Xml(e)
}
}
impl std::fmt::Display for PropfindParseError {
fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
write!(f, "{}", self.description())
}
}
impl Error for PropfindParseError {
fn description(&self) -> &str {
use self::PropfindParseError::*;
match *self {
UnknownDocument => "not a propfind response",
InvalidFieldValue => "field must only contain text",
UnknownElement => "document must only contain responses",
UnknownField => "unsupported field",
ExpectedEndOfDocument => "expected end of document",
Xml(ref e) => e.description(),
}
}
fn cause(&self) -> Option<&Error> {
use self::PropfindParseError::*;
match *self {
Xml(ref e) => Some(e as &Error),
_ => None,
}
}
}
pub fn parse_propfind_response<R: Read>(read: R) -> Result<Vec<PropfindResponse>, PropfindParseError> {
enum Field {
Href,
Ignored,
}
enum State {
Items,
Item {
item: PropfindResponse,
field: Option<Field>,
},
Start,
End,
}
let parser = EventReader::new_with_config(read,
ParserConfig {
trim_whitespace: true,
cdata_to_characters: true,
..Default::default()
});
let mut items = Vec::new();
let mut state = State::Start;
for e in parser {
let e = try!(e);
state = match state {
State::Start => {
match e {
XmlEvent::StartDocument { .. } => State::Start,
XmlEvent::StartElement { ref name, .. } if name.local_name == "multistatus" => {
State::Items
}
_ => return Err(PropfindParseError::UnknownDocument),
}
}
State::End => {
match e {
XmlEvent::EndDocument => return Ok(items),
_ => return Err(PropfindParseError::ExpectedEndOfDocument),
}
}
State::Items => {
match e {
XmlEvent::EndElement { .. } => State::End,
XmlEvent::StartElement { ref name, .. } if name.local_name == "response" => {
State::Item {
item: PropfindResponse::default(),
field: None,
}
}
_ => return Err(PropfindParseError::UnknownElement),
}
}
State::Item { field: None, item } => {
match e {
XmlEvent::StartElement { name, .. } => {
match &*name.local_name {
"href" => {
State::Item {
field: Some(Field::Href),
item: item,
}
}
_ => {
State::Item {
field: Some(Field::Ignored),
item: item,
}
}
}
}
XmlEvent::EndElement { name } => {
match &*name.local_name {
"response" => {
items.push(item);
State::Items
}
// ignore nested elements for now
_ => {
State::Item {
field: None,
item: item,
}
}
}
}
_ => {
State::Item {
field: None,
item: item,
}
}
}
}
State::Item { field: Some(field), mut item } => {
match e {
XmlEvent::Characters(s) => {
match field {
Field::Href => item.href = s,
Field::Ignored => {}
};
State::Item {
field: Some(field),
item: item,
}
}
XmlEvent::EndElement { .. } => {
State::Item {
field: None,
item: item,
}
}
// ignore nested element for now
XmlEvent::StartElement { .. } => {
State::Item {
field: Some(field),
item: item,
}
}
_ => return Err(PropfindParseError::InvalidFieldValue),
}
}
}
}
Ok(items)
}