76 lines
2.7 KiB
Rust
76 lines
2.7 KiB
Rust
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use super::error::Res;
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use super::util::WORD_CONSTITUENT_CHARACTERS;
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use super::Context;
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use crate::parser::element::element;
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use crate::parser::greater_element::FootnoteDefinition;
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use crate::parser::parser_context::ChainBehavior;
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use crate::parser::parser_context::ContextElement;
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use crate::parser::parser_context::ExitMatcherNode;
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use crate::parser::parser_with_context::parser_with_context;
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use crate::parser::util::blank_line;
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use crate::parser::util::exit_matcher_parser;
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use crate::parser::util::get_consumed;
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use crate::parser::util::start_of_line;
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use crate::parser::util::whitespace_eof;
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use nom::branch::alt;
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use nom::bytes::complete::tag;
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use nom::bytes::complete::tag_no_case;
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use nom::bytes::complete::take_while;
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use nom::character::complete::digit1;
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use nom::character::complete::space0;
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use nom::combinator::recognize;
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use nom::combinator::verify;
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use nom::multi::many1;
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use nom::multi::many_till;
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use nom::sequence::tuple;
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#[tracing::instrument(ret, level = "debug")]
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pub fn footnote_definition<'r, 's>(
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context: Context<'r, 's>,
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input: &'s str,
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) -> Res<&'s str, FootnoteDefinition<'s>> {
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start_of_line(context, input)?;
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// Cannot be indented.
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let (remaining, (_lead_in, lbl, _lead_out, _ws)) =
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tuple((tag_no_case("[fn:"), label, tag("]"), space0))(input)?;
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let parser_context =
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context.with_additional_node(ContextElement::ExitMatcherNode(ExitMatcherNode {
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exit_matcher: ChainBehavior::IgnoreParent(Some(&footnote_definition_end)),
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}));
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let element_matcher = parser_with_context!(element)(&parser_context);
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let exit_matcher = parser_with_context!(exit_matcher_parser)(&parser_context);
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let (remaining, (children, _exit_contents)) =
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many_till(element_matcher, exit_matcher)(remaining)?;
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let footnote_definition_end_matcher = parser_with_context!(footnote_definition_end)(context);
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let (remaining, _end) = alt((footnote_definition_end_matcher, whitespace_eof))(remaining)?;
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let source = get_consumed(input, remaining);
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Ok((
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remaining,
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FootnoteDefinition {
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source,
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label: lbl,
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children,
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},
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))
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}
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#[tracing::instrument(ret, level = "debug")]
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fn label<'s>(input: &'s str) -> Res<&'s str, &'s str> {
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alt((
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digit1,
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take_while(|c| WORD_CONSTITUENT_CHARACTERS.contains(c) || "-_".contains(c)),
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))(input)
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}
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#[tracing::instrument(ret, level = "debug")]
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fn footnote_definition_end<'r, 's>(
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context: Context<'r, 's>,
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input: &'s str,
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) -> Res<&'s str, &'s str> {
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let start_of_line_matcher = parser_with_context!(start_of_line)(&context);
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recognize(tuple((
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start_of_line_matcher,
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verify(many1(blank_line), |lines: &Vec<&str>| lines.len() >= 2),
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)))(input)
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}
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