block: add hierarchical heading sections
This commit is contained in:
Noah Hellman
parent
5347def13c
commit
530820a04e
3 changed files with 59 additions and 13 deletions
61
src/block.rs
61
src/block.rs
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@ -102,6 +102,9 @@ pub enum Container {
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/// Span is first '|' character.
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TableRow { head: bool },
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/// Span is '#' characters of heading.
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Section,
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}
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#[derive(Debug, Clone, Copy, PartialEq, Eq)]
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@ -132,6 +135,8 @@ struct TreeParser<'s> {
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prev_blankline: bool,
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/// Stack of currently open lists.
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open_lists: Vec<OpenList>,
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/// Stack of currently open sections.
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open_sections: Vec<u32>,
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/// Alignments for each column in for the current table.
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alignments: Vec<Alignment>,
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}
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@ -145,6 +150,7 @@ impl<'s> TreeParser<'s> {
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prev_blankline: false,
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open_lists: Vec::new(),
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alignments: Vec::new(),
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open_sections: Vec::new(),
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}
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}
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@ -153,7 +159,7 @@ impl<'s> TreeParser<'s> {
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let mut lines = lines(self.src).collect::<Vec<_>>();
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let mut line_pos = 0;
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while line_pos < lines.len() {
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let line_count = self.parse_block(&mut lines[line_pos..]);
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let line_count = self.parse_block(&mut lines[line_pos..], true);
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if line_count == 0 {
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break;
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}
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@ -162,11 +168,14 @@ impl<'s> TreeParser<'s> {
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for _ in self.open_lists.drain(..) {
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self.tree.exit(); // list
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}
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for _ in self.open_sections.drain(..) {
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self.tree.exit(); // section
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}
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self.tree.finish()
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}
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/// Recursively parse a block and all of its children. Return number of lines the block uses.
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fn parse_block(&mut self, lines: &mut [Span]) -> usize {
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fn parse_block(&mut self, lines: &mut [Span], top_level: bool) -> usize {
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BlockParser::parse(lines.iter().map(|sp| sp.of(self.src))).map_or(
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0,
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|(indent, kind, span, line_count)| {
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@ -236,7 +245,7 @@ impl<'s> TreeParser<'s> {
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match kind {
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Block::Atom(a) => self.tree.atom(a, span),
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Block::Leaf(l) => self.parse_leaf(l, lines, span, indent),
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Block::Leaf(l) => self.parse_leaf(l, lines, span, indent, top_level),
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Block::Container(Table) => self.parse_table(lines, span),
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Block::Container(c) => self.parse_container(c, lines, span, indent),
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}
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@ -246,7 +255,14 @@ impl<'s> TreeParser<'s> {
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)
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}
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fn parse_leaf(&mut self, l: Leaf, lines: &mut [Span], span: Span, indent: usize) {
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fn parse_leaf(
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&mut self,
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l: Leaf,
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lines: &mut [Span],
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span: Span,
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indent: usize,
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top_level: bool,
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) {
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if matches!(l, Leaf::CodeBlock) {
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for line in lines.iter_mut() {
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let indent_line = line.len() - line.trim_start(self.src).len();
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@ -266,6 +282,21 @@ impl<'s> TreeParser<'s> {
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}
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}
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if matches!(l, Leaf::Heading) && top_level {
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let level = u32::try_from(span.len()).unwrap();
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let first_close = self
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.open_sections
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.iter()
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.rev()
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.rposition(|l| *l > level)
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.map_or(0, |i| i + 1);
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self.open_sections.drain(first_close..).for_each(|_| {
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self.tree.exit(); // section
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});
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self.open_sections.push(level);
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self.tree.enter(Node::Container(Section), span);
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}
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self.tree.enter(Node::Leaf(l), span);
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lines.iter().for_each(|line| self.tree.inline(*line));
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self.tree.exit();
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@ -288,7 +319,7 @@ impl<'s> TreeParser<'s> {
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}
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}
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ListItem(..) | Footnote | Div => spaces.min(indent),
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List { .. } | DescriptionList | Table | TableRow { .. } => {
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List { .. } | DescriptionList | Table | TableRow { .. } | Section => {
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panic!()
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}
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};
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@ -319,7 +350,7 @@ impl<'s> TreeParser<'s> {
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self.tree.enter(Node::Container(c), span);
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let mut l = 0;
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while l < lines.len() {
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l += self.parse_block(&mut lines[l..]);
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l += self.parse_block(&mut lines[l..], false);
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}
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if let Some(OpenList { depth, .. }) = self.open_lists.last() {
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@ -663,7 +694,7 @@ impl BlockParser {
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}
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}
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}
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Block::Container(List { .. } | DescriptionList | TableRow { .. })
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Block::Container(List { .. } | DescriptionList | TableRow { .. } | Section)
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| Block::Leaf(TableCell(..) | Caption) => {
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panic!()
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}
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@ -867,21 +898,25 @@ mod test {
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fn parse_heading_multi() {
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test_parse!(
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concat!(
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"# 2\n",
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"\n",
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" # 8\n",
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" 12\n",
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"15\n", //
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),
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"# 2\n",
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"\n",
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" # 8\n",
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" 12\n",
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"15\n", //
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),
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(Enter(Container(Section)), "#"),
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(Enter(Leaf(Heading)), "#"),
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(Inline, "2"),
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(Exit(Leaf(Heading)), "#"),
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(Atom(Blankline), "\n"),
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(Exit(Container(Section)), "#"),
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(Enter(Container(Section)), "#"),
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(Enter(Leaf(Heading)), "#"),
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(Inline, "8\n"),
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(Inline, "12\n"),
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(Inline, "15"),
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(Exit(Leaf(Heading)), "#"),
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(Exit(Container(Section)), "#"),
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);
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}
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@ -148,6 +148,7 @@ impl<'s, I: Iterator<Item = Event<'s>>, W: std::fmt::Write> Writer<'s, I, W> {
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}
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Container::Table => self.out.write_str("<table")?,
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Container::TableRow { .. } => self.out.write_str("<tr")?,
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Container::Section => self.out.write_str("<section")?,
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Container::Div { .. } => self.out.write_str("<div")?,
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Container::Paragraph => {
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if matches!(self.list_tightness.last(), Some(true)) {
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@ -311,6 +312,7 @@ impl<'s, I: Iterator<Item = Event<'s>>, W: std::fmt::Write> Writer<'s, I, W> {
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}
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Container::Table => self.out.write_str("</table>")?,
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Container::TableRow { .. } => self.out.write_str("</tr>")?,
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Container::Section => self.out.write_str("</section>")?,
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Container::Div { .. } => self.out.write_str("</div>")?,
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Container::Paragraph => {
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if matches!(self.list_tightness.last(), Some(true)) {
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@ -48,6 +48,8 @@ pub enum Container<'s> {
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Table,
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/// A row element of a table.
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TableRow { head: bool },
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/// A section belonging to a top level heading.
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Section,
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/// A block-level divider element.
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Div { class: Option<&'s str> },
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/// A paragraph.
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@ -105,6 +107,7 @@ impl<'s> Container<'s> {
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| Self::Footnote { .. }
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| Self::Table
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| Self::TableRow { .. }
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| Self::Section
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| Self::Div { .. }
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| Self::Paragraph
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| Self::Heading { .. }
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@ -141,6 +144,7 @@ impl<'s> Container<'s> {
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| Self::Footnote { .. }
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| Self::Table
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| Self::TableRow { .. }
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| Self::Section
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| Self::Div { .. } => true,
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Self::Paragraph
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| Self::Heading { .. }
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@ -620,6 +624,7 @@ impl<'s> Parser<'s> {
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}
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Container::TableRow { head }
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}
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block::Container::Section => Container::Section,
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},
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};
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if enter {
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@ -739,16 +744,20 @@ mod test {
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fn heading() {
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test_parse!(
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"#\n",
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Start(Section, Attributes::new()),
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Start(Heading { level: 1 }, Attributes::new()),
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End(Heading { level: 1 }),
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End(Section),
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);
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test_parse!(
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"# abc\ndef\n",
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Start(Section, Attributes::new()),
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Start(Heading { level: 1 }, Attributes::new()),
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Str("abc".into()),
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Atom(Softbreak),
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Str("def".into()),
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End(Heading { level: 1 }),
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End(Section),
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);
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}
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