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use crate::Path;
use log::debug;
use std::collections::BTreeMap;
use yaml_rust::{
parser::{Event as YamlEvent, MarkedEventReceiver},
scanner::{Marker, TScalarStyle, TokenType},
};
#[derive(Debug, PartialEq)]
pub struct Position {
pub line: usize,
pub col: usize,
}
impl Into<Position> for Marker {
fn into(self) -> Position {
let (line, col) = (self.line(), self.col());
Position { line, col }
}
}
#[derive(Debug, PartialEq, Clone)]
enum Event {
Scalar(String, TScalarStyle, Option<TokenType>),
SequenceStart,
SequenceEnd,
MappingStart,
MappingEnd,
}
#[doc(hidden)]
impl Default for Positions {
fn default() -> Self {
Self {
pos: 0,
events: Vec::new(),
index: BTreeMap::new(),
}
}
}
pub struct Positions {
pos: usize,
events: Vec<(Event, Marker)>,
index: BTreeMap<String, Position>,
}
impl Positions {
pub fn get<P>(
&self,
ptr: P,
) -> Option<&Position>
where
P: AsRef<str>,
{
self.index.get(ptr.as_ref())
}
fn next(&mut self) -> Option<(Event, Position)> {
self.events.clone().get(self.pos).map(|event| {
self.pos += 1;
(event.clone().0, event.1.into())
})
}
pub fn iter(&self) -> impl IntoIterator<Item = (&String, &Position)> {
self.index.iter()
}
pub(crate) fn collect(
&mut self,
path: &Path,
) {
if let Some((ev, _)) = self.next() {
match ev {
Event::SequenceStart => {
self.collect_seq(0, path);
self.collect(path);
}
Event::MappingStart => {
self.collect_map(path);
self.collect(path);
}
other => debug!("unhandled {:?} in collect", other),
}
}
}
fn collect_seq(
&mut self,
index: usize,
path: &Path,
) {
if let Some((ev, pos)) = self.next() {
match ev {
Event::SequenceEnd => (),
Event::Scalar(_, _, _) => {
self.index.insert(
format!(
"{}",
Path::Seq {
parent: &path,
index: index
}
),
pos,
);
self.collect_seq(index + 1, &path);
}
Event::MappingStart => {
self.collect_map(&Path::Seq {
parent: &path,
index,
});
self.collect_seq(index + 1, &path);
}
other => debug!("unhandled {:?} in collect_seq", other),
}
}
}
fn collect_map(
&mut self,
path: &Path,
) {
if let Some((ev, pos)) = self.next() {
match ev {
Event::MappingEnd => (),
Event::Scalar(key, _, _) => {
let this_path = Path::Map {
parent: &path,
key: &key,
};
self.index.insert(format!("{}", this_path), pos);
match self.next() {
Some((Event::MappingStart, _)) => {
self.collect_map(&this_path);
}
Some((Event::SequenceStart, _)) => {
self.collect_seq(0, &this_path);
}
_ => (),
}
self.collect_map(&path);
}
other => debug!("unhandled {:?} in collect_map", other),
}
}
}
}
#[doc(hidden)]
impl MarkedEventReceiver for Positions {
fn on_event(
&mut self,
event: YamlEvent,
marker: Marker,
) {
let event = match event {
YamlEvent::Nothing
| YamlEvent::StreamStart
| YamlEvent::StreamEnd
| YamlEvent::DocumentStart
| YamlEvent::DocumentEnd
| YamlEvent::Alias(_) => return,
YamlEvent::Scalar(value, style, _, tag) => {
Event::Scalar(value, style, tag)
}
YamlEvent::SequenceStart(_) => {
Event::SequenceStart
}
YamlEvent::SequenceEnd => Event::SequenceEnd,
YamlEvent::MappingStart(_) => {
Event::MappingStart
}
YamlEvent::MappingEnd => Event::MappingEnd,
};
self.events.push((event, marker));
}
}