63 lines
1.9 KiB
Rust
63 lines
1.9 KiB
Rust
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use super::combinator::context_many_till;
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use super::parser_context::ChainBehavior;
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use super::parser_context::ContextElement;
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use super::parser_context::ExitMatcherNode;
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use super::text::blank_line;
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use super::text::line_break;
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use super::text::Paragraph;
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use super::text::Res;
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use super::text::TextElement;
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use super::text_element_parser::flat_text_element;
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use super::token::Token;
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use super::Context;
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use nom::branch::alt;
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use nom::combinator::eof;
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use nom::combinator::map;
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use nom::combinator::not;
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use nom::combinator::recognize;
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use nom::multi::many1;
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use nom::sequence::tuple;
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pub fn paragraph<'s, 'r>(context: Context<'r, 's>, i: &'s str) -> Res<&'s str, Paragraph<'s>> {
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// Add a not(eof) check because many_till cannot match a zero-length string
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not(eof)(i)?;
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let paragraph_context = context
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.with_additional_node(ContextElement::ExitMatcherNode(ExitMatcherNode {
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exit_matcher: ChainBehavior::AndParent(Some(&context_paragraph_end)),
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}))
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.with_additional_node(ContextElement::StartOfParagraph);
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let (remaining, (many, till)) =
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context_many_till(¶graph_context, flat_text_element, context_paragraph_end)(i)?;
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let many = many
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.into_iter()
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.filter_map(|token| match token {
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Token::TextElement(text_element) => Some(text_element),
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Token::Paragraph(_) => panic!("There should only be text elements in paragraphs."),
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})
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.collect();
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Ok((
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remaining,
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Paragraph {
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contents: many,
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paragraph_end: till,
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},
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))
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}
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fn context_paragraph_end<'s, 'r>(
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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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paragraph_end(input)
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}
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fn paragraph_end(input: &str) -> Res<&str, &str> {
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alt((
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recognize(tuple((
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map(line_break, TextElement::LineBreak),
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many1(blank_line),
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))),
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eof,
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))(input)
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}
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