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use std::borrow::Cow;
use std::ops::Range;
use error::{Error, ResultPos};
use escape::unescape;
#[derive(Clone)]
pub struct Attributes<'a> {
bytes: &'a [u8],
position: usize,
exit: bool,
with_checks: bool,
consumed: Vec<Range<usize>>,
}
impl<'a> Attributes<'a> {
pub fn new(buf: &'a [u8], pos: usize) -> Attributes<'a> {
Attributes {
bytes: buf,
position: pos,
exit: false,
with_checks: true,
consumed: Vec::new(),
}
}
pub fn unescaped(self) -> UnescapedAttributes<'a> {
UnescapedAttributes { inner: self }
}
pub fn with_checks(mut self, val: bool) -> Attributes<'a> {
self.with_checks = val;
self
}
fn error(&mut self, e: Error, p: usize) -> ResultPos<(&'a [u8], &'a [u8])> {
self.exit = true;
Err((e, p))
}
}
impl<'a> Iterator for Attributes<'a> {
type Item = ResultPos<(&'a [u8], &'a [u8])>;
fn next(&mut self) -> Option<Self::Item> {
if self.exit {
return None;
}
let len = self.bytes.len();
let p = self.position;
if len <= p {
return None;
}
let mut iter = self.bytes[p..].iter().cloned().enumerate();
let start_key = {
let mut found_space = false;
let start: usize;
loop {
match iter.next() {
Some((_, b' ')) | Some((_, b'\r'))
| Some((_, b'\n')) | Some((_, b'\t')) => {
if !found_space {
found_space = true;
}
}
Some((i, _)) => {
if found_space {
start = i;
break;
}
}
None => {
self.position = len;
return None;
}
}
}
start
};
let mut has_equal = false;
let mut end_key = None;
let mut start_val = None;
let mut end_val = None;
let mut quote = 0;
loop {
match iter.next() {
Some((i, b' ')) | Some((i, b'\r'))
| Some((i, b'\n')) | Some((i, b'\t')) => {
if end_key.is_none() {
end_key = Some(i);
}
}
Some((i, b'=')) => {
if has_equal {
return Some(self.error(Error::Malformed(
"Got 2 '=' tokens".to_string()), p + i));
}
has_equal = true;
if end_key.is_none() {
end_key = Some(i);
}
}
Some((i, q @ b'"')) |
Some((i, q @ b'\'')) => {
if !has_equal {
return Some(self.error(Error::Malformed(
"Unexpected quote before '='".to_string()), p + i));
}
if start_val.is_none() {
start_val = Some(i + 1);
quote = q;
} else if quote == q && end_val.is_none() {
end_val = Some(i);
break;
}
}
None => {
self.position = len;
return None;
}
Some((_, _)) => (),
}
}
self.position += end_val.unwrap() + 1;
let r = (p + start_key)..(p + end_key.unwrap());
if self.with_checks {
let name = &self.bytes[r.clone()];
if let Some(ref r2) = self.consumed
.iter()
.cloned()
.find(|r2| &self.bytes[r2.clone()] == name) {
return Some(self.error(Error::Malformed(
format!("Duplicate attribute at position {} and {}",
r2.start, r.start)), r.start));
}
self.consumed.push(r.clone());
}
Some(Ok((&self.bytes[r],
&self.bytes[(p + start_val.unwrap())..(p + end_val.unwrap())])))
}
}
pub struct UnescapedAttributes<'a> {
inner: Attributes<'a>,
}
impl<'a> Iterator for UnescapedAttributes<'a> {
type Item = ResultPos<(&'a [u8], Cow<'a, [u8]>)>;
fn next(&mut self) -> Option<Self::Item> {
self.inner
.next()
.map(|a| a.and_then(|(k, v)| unescape(v).map(|v| (k, v))))
}
}