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Make a new naive implementation of plain_list.

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This commit is contained in:
Tom Alexander 2023-08-15 01:28:19 -04:00
parent e5e5120a10
commit 72d5f8f35c
Signed by: talexander
GPG Key ID: D3A179C9A53C0EDE
1 changed files with 18 additions and 87 deletions
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105
src/parser/plain_list.rs
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@ -14,8 +14,6 @@ use nom::multi::many_till;
use nom::sequence::preceded;
use nom::sequence::terminated;
use nom::sequence::tuple;
#[cfg(feature = "tracing")]
use tracing::span;
use super::greater_element::PlainList;
use super::greater_element::PlainListItem;
@ -42,97 +40,28 @@ pub fn plain_list<'r, 's>(context: Context<'r, 's>, input: &'s str) -> Res<&'s s
class: ExitClass::Beta,
exit_matcher: &plain_list_end,
}));
let without_consume_context =
parser_context.with_additional_node(ContextElement::ConsumeTrailingWhitespace(false));
let with_consume_context =
parser_context.with_additional_node(ContextElement::ConsumeTrailingWhitespace(true));
let without_consume_matcher = parser_with_context!(plain_list_item)(&without_consume_context);
let with_consume_matcher = parser_with_context!(plain_list_item)(&with_consume_context);
let exit_matcher = parser_with_context!(exit_matcher_parser)(&with_consume_context);
let mut children = Vec::new();
let mut first_item_indentation: Option<usize> = None;
let mut remaining = input;
loop {
/*
Trailing whitespace belongs to the plain list, not the plain list item
Possible outcomes:
Don't consume, yes exit matcher
Don't consume, no additional item
Consume, additional item
*/
{
// Don't consume, yes exit matcher
#[cfg(feature = "tracing")]
let span = span!(tracing::Level::DEBUG, "first");
#[cfg(feature = "tracing")]
let _enter = span.enter();
let last_item_then_exit = tuple((without_consume_matcher, exit_matcher))(remaining);
match last_item_then_exit {
Ok((remain, (item, _exit)))
if item.indentation
== *first_item_indentation.get_or_insert(item.indentation) =>
{
remaining = remain;
children.push(item);
break;
}
Ok(_) | Err(_) => {}
};
}
{
// Consume, additional item
#[cfg(feature = "tracing")]
let span = span!(tracing::Level::DEBUG, "second");
#[cfg(feature = "tracing")]
let _enter = span.enter();
let not_last_item =
tuple((with_consume_matcher, peek(without_consume_matcher)))(remaining);
match not_last_item {
Ok((remain, (item, future_item)))
if item.indentation
== *first_item_indentation.get_or_insert(item.indentation)
&& future_item.indentation
== *first_item_indentation.get_or_insert(item.indentation) =>
{
remaining = remain;
children.push(item);
continue;
}
Ok(_) | Err(_) => {}
};
}
{
// Don't consume, no additional item
#[cfg(feature = "tracing")]
let span = span!(tracing::Level::DEBUG, "third");
#[cfg(feature = "tracing")]
let _enter = span.enter();
let last_item_then_exit = without_consume_matcher(remaining);
match last_item_then_exit {
Ok((remain, item))
if item.indentation
== *first_item_indentation.get_or_insert(item.indentation) =>
{
remaining = remain;
children.push(item);
break;
}
Ok(_) | Err(_) => {
// TODO: Maybe this is reachable when there are no items at all.
return Err(nom::Err::Error(CustomError::MyError(MyError(
"Should be unreachable.",
))));
// unreachable!();
}
};
let maybe_exit = parser_with_context!(exit_matcher_parser)(&parser_context)(remaining);
if maybe_exit.is_ok() {
break;
}
let list_item = parser_with_context!(plain_list_item)(&parser_context)(remaining);
match list_item {
Ok((remain, item))
if item.indentation == *first_item_indentation.get_or_insert(item.indentation) =>
{
remaining = remain;
children.push(item);
continue;
}
Ok(_) | Err(_) => {
break;
}
};
}
if children.is_empty() {
@ -141,6 +70,8 @@ pub fn plain_list<'r, 's>(context: Context<'r, 's>, input: &'s str) -> Res<&'s s
))));
}
// TODO: trailing whitespace
let source = get_consumed(input, remaining);
Ok((remaining, PlainList { source, children }))
}