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use super::{Parser, Result, Slice};
use crate::ast;
#[derive(Debug, PartialEq, Clone, Copy)]
pub(super) enum Level {
None = 0,
Regular = 1,
Group = 2,
Resource = 3,
}
impl<'s, S> Parser<S>
where
S: Slice<'s>,
{
pub(super) fn get_comment(&mut self) -> Result<(ast::Comment<S>, Level)> {
let mut level = Level::None;
let mut content = vec![];
while self.ptr < self.length {
let line_level = self.get_comment_level();
if line_level == Level::None {
self.ptr -= 1;
break;
} else if level != Level::None && line_level != level {
self.ptr -= line_level as usize;
break;
}
level = line_level;
if self.ptr == self.length {
break;
} else if self.is_current_byte(b'\n') {
content.push(self.get_comment_line()?);
} else {
if let Err(e) = self.expect_byte(b' ') {
if content.is_empty() {
return Err(e);
} else {
self.ptr -= line_level as usize;
break;
}
}
content.push(self.get_comment_line()?);
}
self.skip_eol();
}
Ok((ast::Comment { content }, level))
}
fn get_comment_level(&mut self) -> Level {
let mut chars = 0;
for _ in 0..3 {
if self.take_byte_if(b'#') {
chars += 1;
}
}
match chars {
0 => Level::None,
1 => Level::Regular,
2 => Level::Group,
3 => Level::Resource,
_ => unreachable!(),
}
}
fn get_comment_line(&mut self) -> Result<S> {
let start_pos = self.ptr;
while self.ptr < self.length && !self.is_eol() {
self.ptr += 1;
}
Ok(self.source.slice(start_pos..self.ptr))
}
}
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