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|
use super::Event;
use super::input::{InputPosition, ParserInput};
use SyntaxKind::{self, EOF, TOMBSTONE};
pub(crate) struct Marker {
pos: u32,
}
impl Marker {
pub fn complete(self, p: &mut Parser, kind: SyntaxKind) -> CompleteMarker {
match self.event(p) {
&mut Event::Start {
kind: ref mut slot, ..
} => {
*slot = kind;
}
_ => unreachable!(),
}
p.event(Event::Finish);
let result = CompleteMarker { pos: self.pos };
::std::mem::forget(self);
result
}
pub fn abandon(self, p: &mut Parser) {
let idx = self.pos as usize;
if idx == p.events.len() - 1 {
match p.events.pop() {
Some(Event::Start {
kind: TOMBSTONE,
forward_parent: None,
}) => (),
_ => unreachable!(),
}
}
::std::mem::forget(self);
}
fn event<'p>(&self, p: &'p mut Parser) -> &'p mut Event {
&mut p.events[self.idx()]
}
fn idx(&self) -> usize {
self.pos as usize
}
}
impl Drop for Marker {
fn drop(&mut self) {
if !::std::thread::panicking() {
panic!("Each marker should be eithe completed or abandoned");
}
}
}
pub(crate) struct CompleteMarker {
pos: u32,
}
impl CompleteMarker {
pub(crate) fn precede(self, p: &mut Parser) -> Marker {
let m = p.start();
match p.events[self.pos as usize] {
Event::Start {
ref mut forward_parent,
..
} => {
*forward_parent = Some(m.pos - self.pos);
}
_ => unreachable!(),
}
m
}
}
pub(crate) struct TokenSet {
pub tokens: &'static [SyntaxKind],
}
impl TokenSet {
pub fn contains(&self, kind: SyntaxKind) -> bool {
self.tokens.contains(&kind)
}
}
#[macro_export]
macro_rules! token_set {
($($t:ident),*) => {
TokenSet {
tokens: &[$($t),*],
}
};
($($t:ident),* ,) => {
token_set!($($t),*)
};
}
pub(crate) struct Parser<'t> {
inp: &'t ParserInput<'t>,
pos: InputPosition,
events: Vec<Event>,
}
impl<'t> Parser<'t> {
pub(crate) fn new(inp: &'t ParserInput<'t>) -> Parser<'t> {
Parser {
inp,
pos: InputPosition::new(),
events: Vec::new(),
}
}
pub(crate) fn into_events(self) -> Vec<Event> {
assert_eq!(self.current(), EOF);
self.events
}
pub(crate) fn start(&mut self) -> Marker {
let m = Marker {
pos: self.events.len() as u32,
};
self.event(Event::Start {
kind: TOMBSTONE,
forward_parent: None,
});
m
}
pub(crate) fn error<'p, T: Into<String>>(&'p mut self, msg: T) -> ErrorBuilder<'p, 't> {
ErrorBuilder::new(self, msg.into())
}
pub(crate) fn bump(&mut self) {
let kind = self.current();
if kind == EOF {
return;
}
self.pos += 1;
self.event(Event::Token {
kind,
n_raw_tokens: 1,
});
}
pub(crate) fn bump_remap(&mut self, kind: SyntaxKind) {
if self.current() == EOF {
// TODO: panic!?
return;
}
self.pos += 1;
self.event(Event::Token {
kind,
n_raw_tokens: 1,
});
}
pub(crate) fn nth(&self, n: u32) -> SyntaxKind {
self.inp.kind(self.pos + n)
}
pub(crate) fn at_kw(&self, t: &str) -> bool {
self.inp.text(self.pos) == t
}
pub(crate) fn current(&self) -> SyntaxKind {
self.nth(0)
}
fn event(&mut self, event: Event) {
self.events.push(event)
}
}
pub(crate) struct ErrorBuilder<'p, 't: 'p> {
message: String,
parser: &'p mut Parser<'t>,
}
impl<'p, 't: 'p> Drop for ErrorBuilder<'p, 't> {
fn drop(&mut self) {
let message = ::std::mem::replace(&mut self.message, String::new());
self.parser.event(Event::Error { message });
}
}
impl<'t, 'p> ErrorBuilder<'p, 't> {
fn new(parser: &'p mut Parser<'t>, message: String) -> Self {
ErrorBuilder { message, parser }
}
}
|
