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use {Token, SyntaxKind, TextUnit};
use super::{Event};
use super::super::is_insignificant;
use syntax_kinds::{L_CURLY, R_CURLY, ERROR};
pub struct Parser<'t> {
text: &'t str,
raw_tokens: &'t [Token],
non_ws_tokens: Vec<(usize, TextUnit)>,
pos: usize,
events: Vec<Event>,
curly_level: i32,
}
impl<'t> Parser<'t> {
pub(crate) fn new(text: &'t str, raw_tokens: &'t [Token]) -> Parser<'t> {
let mut non_ws_tokens = Vec::new();
let mut len = TextUnit::new(0);
for (idx, &token) in raw_tokens.iter().enumerate() {
if !is_insignificant(token.kind) {
non_ws_tokens.push((idx, len))
}
len += token.len;
}
Parser {
text,
raw_tokens,
non_ws_tokens,
pos: 0,
events: Vec::new(),
curly_level: 0,
}
}
pub(crate) fn into_events(self) -> Vec<Event> {
assert!(self.is_eof());
self.events
}
pub(crate) fn is_eof(&self) -> bool {
self.pos == self.non_ws_tokens.len()
}
pub(crate) fn start(&mut self, kind: SyntaxKind) {
self.event(Event::Start { kind });
}
pub(crate) fn finish(&mut self) {
self.event(Event::Finish);
}
pub(crate) fn current(&self) -> Option<SyntaxKind> {
if self.is_eof() {
return None;
}
let idx = self.non_ws_tokens[self.pos].0;
Some(self.raw_tokens[idx].kind)
}
pub(crate) fn current_is(&self, kind: SyntaxKind) -> bool {
self.current() == Some(kind)
}
pub(crate) fn bump(&mut self) -> Option<SyntaxKind> {
let kind = self.current()?;
match kind {
L_CURLY => self.curly_level += 1,
R_CURLY => self.curly_level -= 1,
_ => (),
}
self.pos += 1;
self.event(Event::Token { kind, n_raw_tokens: 1 });
Some(kind)
}
pub(crate) fn expect(&mut self, kind: SyntaxKind) -> Result<(), ()> {
if kind == self.current().ok_or(())? {
self.bump();
Ok(())
} else {
Err(())
}
}
pub(crate) fn curly_block<F: FnOnce(&mut Parser)>(&mut self, f: F) -> Result<(), ()> {
let level = self.curly_level;
self.expect(L_CURLY)?;
f(self);
assert!(self.curly_level > level);
if self.expect(R_CURLY).is_ok() {
return Ok(());
}
self.start(ERROR);
while self.curly_level > level {
if self.bump().is_none() {
break;
}
}
self.finish();
Ok(()) //???
}
fn event(&mut self, event: Event) {
self.events.push(event)
}
}
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