Fix handling of leading blank lines in greater blocks.

src/parser/greater_block.rs

@@ -5,22 +5,21 @@ use nom::character::complete::anychar;
 use nom::character::complete::line_ending;
 use nom::character::complete::space0;
 use nom::character::complete::space1;
-use nom::combinator::consumed;
 use nom::combinator::eof;
 use nom::combinator::not;
 use nom::combinator::opt;
 use nom::combinator::peek;
 use nom::combinator::recognize;
 use nom::combinator::verify;
-use nom::multi::many0;
 use nom::multi::many_till;
-use nom::sequence::preceded;
 use nom::sequence::tuple;
 
 use super::affiliated_keyword::parse_affiliated_keywords;
 use super::org_source::OrgSource;
+use super::paragraph::empty_paragraph;
 use super::util::in_section;
 use super::util::maybe_consume_trailing_whitespace_if_not_exiting;
+use crate::context::bind_context;
 use crate::context::parser_with_context;
 use crate::context::ContextElement;
 use crate::context::ContextMatcher;
@@ -37,7 +36,6 @@ use crate::parser::util::start_of_line;
 use crate::types::CenterBlock;
 use crate::types::Element;
 use crate::types::Keyword;
-use crate::types::Paragraph;
 use crate::types::QuoteBlock;
 use crate::types::SpecialBlock;
 
@@ -265,18 +263,19 @@ fn greater_block_body<'c, 'b, 'g, 'r, 's>(
     let exit_matcher = parser_with_context!(exit_matcher_parser)(&parser_context);
     not(exit_matcher)(remaining)?;
     let contents_begin = remaining;
-    let (remaining, leading_blank_lines) = opt(consumed(tuple((
-        blank_line,
-        many0(preceded(not(exit_matcher), blank_line)),
-    ))))(remaining)?;
-    let leading_blank_lines =
-        leading_blank_lines.map(|(source, (first_line, _remaining_lines))| {
-            Element::Paragraph(Paragraph::of_text(source.into(), first_line.into()))
-        });
+
+    let blank_line_context = ContextElement::ExitMatcherNode(ExitMatcherNode {
+        class: ExitClass::Alpha,
+        exit_matcher: &leading_blank_lines_end,
+    });
+    let blank_line_context = parser_context.with_additional_node(&blank_line_context);
+
+    let (remaining, leading_blank_lines) =
+        opt(bind_context!(empty_paragraph, &blank_line_context))(remaining)?;
     let (remaining, (mut children, _exit_contents)) =
         many_till(element_matcher, exit_matcher)(remaining)?;
     if let Some(lines) = leading_blank_lines {
-        children.insert(0, lines);
+        children.insert(0, Element::Paragraph(lines));
     }
     let contents = get_consumed(contents_begin, remaining);
 
@@ -335,3 +334,14 @@ fn _greater_block_end<'b, 'g, 'r, 's, 'c>(
     let source = get_consumed(input, remaining);
     Ok((remaining, source))
 }
+
+#[cfg_attr(
+    feature = "tracing",
+    tracing::instrument(ret, level = "debug", skip(_context))
+)]
+fn leading_blank_lines_end<'b, 'g, 'r, 's, 'c>(
+    _context: RefContext<'b, 'g, 'r, 's>,
+    input: OrgSource<'s>,
+) -> Res<OrgSource<'s>, OrgSource<'s>> {
+    recognize(not(blank_line))(input)
+}