organic/src/parser/plain_list.rs

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use nom::branch::alt;
use nom::bytes::complete::tag;
use nom::character::complete::anychar;
use nom::character::complete::digit1;
use nom::character::complete::line_ending;
use nom::character::complete::one_of;
use nom::character::complete::space0;
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use nom::combinator::consumed;
use nom::combinator::not;
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use nom::combinator::opt;
use nom::combinator::peek;
use nom::combinator::recognize;
use nom::combinator::verify;
use nom::multi::many0_count;
use nom::multi::many1;
use nom::sequence::tuple;
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use super::combinator::context_many_till;
use super::error::CustomError;
use super::error::MyError;
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use super::error::Res;
use super::paragraph::paragraph_end;
use super::parser_context::ContextElement;
use super::parser_with_context::parser_with_context;
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use super::text::space;
use super::text::text_element;
use super::token::ListItem;
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use super::token::PlainList;
use super::token::Token;
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use super::Context;
pub fn plain_list<'r, 's>(context: Context<'r, 's>, i: &'s str) -> Res<&'s str, PlainList<'s>> {
// todo
todo!()
}
pub fn item<'r, 's>(context: Context<'r, 's>, i: &'s str) -> Res<&'s str, ListItem<'s>> {
let (remaining, leading_whitespace) = space0(i)?;
let indent_level = leading_whitespace.len();
let list_item_context = context.with_additional_node(ContextElement::ListItem(indent_level));
let (remaining, (bul, countset, check, tg, sp, (contents, end))) = tuple((
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bullet,
opt(tuple((space, counter_set))),
opt(tuple((space, check_box))),
opt(tuple((space, item_tag))),
space,
context_many_till(&list_item_context, text_element, item_end),
))(remaining)?;
let elements = contents
.into_iter()
.filter_map(|token| match token {
Token::TextElement(text_element) => Some(text_element),
Token::Paragraph(_) => panic!("There should only be text elements in items."),
})
.collect();
let source = {
let offset = remaining.as_ptr() as usize - i.as_ptr() as usize;
&i[..offset]
};
let ret = ListItem {
source,
leading_whitespace,
bullet: bul,
counter_set: countset.map(|(_spc, count)| count),
check_box: check.map(|(_spc, check)| check),
item_tag: tg.map(|(_spc, tg)| tg),
contents: elements,
};
Ok((remaining, ret))
}
fn counter<'s>(i: &'s str) -> Res<&'s str, &'s str> {
alt((recognize(one_of("abcdefghijklmnopqrstuvwxyz")), digit1))(i)
}
fn bullet<'s>(i: &'s str) -> Res<&'s str, &'s str> {
alt((
tag("*"),
tag("-"),
tag("+"),
recognize(tuple((counter, alt((tag("."), tag(")")))))),
))(i)
}
fn counter_set<'s>(i: &'s str) -> Res<&'s str, &'s str> {
recognize(tuple((tag("[@"), counter, tag("]"))))(i)
}
fn check_box<'s>(i: &'s str) -> Res<&'s str, &'s str> {
recognize(alt((tag("[ ]"), tag("[X]"), tag("[-]"))))(i)
}
fn item_tag<'s>(i: &'s str) -> Res<&'s str, &'s str> {
recognize(tuple((tag_text, tag_separator)))(i)
}
fn tag_text<'s>(i: &'s str) -> Res<&'s str, &'s str> {
recognize(many1(tag_text_character))(i)
}
fn tag_text_character<'s>(i: &'s str) -> Res<&'s str, &'s str> {
not(alt((tag_separator, line_ending)))(i)?;
recognize(anychar)(i)
}
fn tag_separator<'s>(i: &'s str) -> Res<&'s str, &'s str> {
tag(" :: ")(i)
}
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pub fn item_end<'r, 's>(context: Context<'r, 's>, i: &'s str) -> Res<&'s str, &'s str> {
let item_matcher = parser_with_context!(item)(&context);
let line_indented_matcher = parser_with_context!(line_indented_lte)(&context);
alt((
paragraph_end,
recognize(tuple((line_ending, peek(line_indented_matcher)))),
// TODO: Do we still need the item_matcher entry here? If we remove it, then child items should become part of the body of the parent item which would match the description on https://orgmode.org/worg/org-syntax.html
recognize(tuple((line_ending, peek(item_matcher)))),
))(i)
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}
fn line_indented_lte<'r, 's>(context: Context<'r, 's>, i: &'s str) -> Res<&'s str, &'s str> {
let current_item_indent_level: &usize = get_context_item_indent(context).ok_or(
nom::Err::Error(CustomError::MyError(MyError("NotInPlainListItem"))),
)?;
let matched = recognize(verify(
tuple((space0::<&str, _>, anychar)),
|(_space0, _anychar)| _space0.len() <= *current_item_indent_level,
))(i)?;
Ok(matched)
}
fn get_context_item_indent<'r, 's>(context: Context<'r, 's>) -> Option<&'r usize> {
for thing in context.iter() {
match thing.get_data() {
ContextElement::ListItem(depth) => return Some(depth),
_ => {}
};
}
None
}