735 lines
22 KiB
Rust
735 lines
22 KiB
Rust
use crate::Span;
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use crate::EOF;
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use crate::tree;
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use Atom::*;
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use Container::*;
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use Leaf::*;
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pub type Tree = tree::Tree<Block, Atom>;
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#[must_use]
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pub fn parse(src: &str) -> Tree {
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TreeParser::new(src).parse()
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}
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#[derive(Debug, Clone, Copy, PartialEq, Eq)]
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pub enum Block {
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/// An atomic block, containing no children elements.
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Atom(Atom),
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/// A leaf block, containing only inline elements.
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Leaf(Leaf),
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/// A container block, containing children blocks.
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Container(Container),
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}
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#[derive(Debug, Clone, Copy, PartialEq, Eq)]
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pub enum Atom {
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/// Inline content with unparsed inline elements.
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Inline,
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/// A line with no non-whitespace characters.
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Blankline,
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/// A list of attributes.
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Attributes,
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/// A thematic break.
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ThematicBreak,
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}
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#[derive(Debug, Clone, Copy, PartialEq, Eq)]
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pub enum Leaf {
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/// Span is empty, before first character of paragraph.
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/// Each inline is a line.
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Paragraph,
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/// Span is `#` characters.
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/// Each inline is a line.
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Heading,
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/// Span is first `|` character.
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/// Each inline is a line (row).
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Table,
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/// Span is the link tag.
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/// Inlines are lines of the URL.
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LinkDefinition,
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/// Span is language specifier.
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/// Each inline is a line.
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CodeBlock,
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}
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#[derive(Debug, Clone, Copy, PartialEq, Eq)]
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pub enum Container {
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/// Span is first `>` character.
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Blockquote,
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/// Span is class specifier.
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Div,
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/// Span is the list marker.
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ListItem,
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/// Span is first `[^` instance.
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Footnote,
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}
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/// Parser for block-level tree structure of entire document.
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struct TreeParser<'s> {
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src: &'s str,
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tree: tree::Builder<Block, Atom>,
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}
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impl<'s> TreeParser<'s> {
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#[must_use]
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pub fn new(src: &'s str) -> Self {
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Self {
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src,
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tree: tree::Builder::new(),
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}
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}
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#[must_use]
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pub fn parse(mut self) -> Tree {
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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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if line_count == 0 {
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break;
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}
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line_pos += line_count;
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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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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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let lines = {
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let l = lines.len().min(line_count);
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&mut lines[..l]
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};
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let truncated = lines.len() < line_count;
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let span = span.translate(lines[0].start());
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// skip part of first inline that is shared with the block span
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lines[0] = lines[0].with_start(span.end());
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// remove junk from footnotes / link defs
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if matches!(
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kind,
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Block::Leaf(LinkDefinition) | Block::Container(Footnote { .. })
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) {
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assert_eq!(&lines[0].of(self.src).chars().as_str()[0..2], "]:");
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lines[0] = lines[0].skip(2);
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}
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// skip closing fence of code blocks / divs
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let lines = if !truncated
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&& matches!(kind, Block::Leaf(CodeBlock) | Block::Container(Div))
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{
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let l = lines.len();
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&mut lines[..l - 1]
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} else {
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lines
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};
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match kind {
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Block::Atom(a) => {
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assert_ne!(a, Inline);
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self.tree.atom(a, span);
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}
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Block::Leaf(l) => {
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self.tree.enter(kind, span);
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// trim starting whitespace of the block contents
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lines[0] = lines[0].trim_start(self.src);
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// skip first inline if empty (e.g. code block)
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let lines = if lines[0].is_empty() {
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&mut lines[1..]
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} else {
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lines
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};
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// trim ending whitespace of block if not verbatim
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if !matches!(l, Leaf::CodeBlock) {
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let l = lines.len();
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if l > 0 {
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let last = &mut lines[l - 1];
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*last = last.trim_end(self.src);
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}
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}
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lines.iter().for_each(|line| self.tree.atom(Inline, *line));
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self.tree.exit();
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}
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Block::Container(c) => {
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let (skip_chars, skip_lines_suffix) = match c {
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Blockquote => (2, 0),
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ListItem | Footnote => (indent, 0),
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Div => (0, 1),
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};
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let line_count_inner = lines.len() - skip_lines_suffix;
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// update spans, remove indentation / container prefix
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lines
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.iter_mut()
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.skip(1)
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.take(line_count_inner)
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.for_each(|sp| {
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let skip = (sp
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.of(self.src)
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.chars()
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.take_while(|c| c.is_whitespace())
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.count()
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+ skip_chars)
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.min(sp.len() - usize::from(sp.of(self.src).ends_with('\n')));
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*sp = sp.skip(skip);
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});
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self.tree.enter(kind, span);
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let mut l = 0;
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while l < line_count_inner {
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l += self.parse_block(&mut lines[l..line_count_inner]);
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}
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self.tree.exit();
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}
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}
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line_count
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},
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)
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}
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}
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/// Parser for a single block.
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struct BlockParser {
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indent: usize,
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kind: Block,
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span: Span,
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fence: Option<(char, usize)>,
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}
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impl BlockParser {
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/// Parse a single block. Return number of lines the block uses.
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fn parse<'s, I: Iterator<Item = &'s str>>(mut lines: I) -> Option<(usize, Block, Span, usize)> {
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lines.next().map(|l| {
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let mut p = BlockParser::new(l);
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let has_end_delimiter =
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matches!(p.kind, Block::Leaf(CodeBlock) | Block::Container(Div));
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let line_count_match = lines.take_while(|l| p.continues(l)).count();
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let line_count = 1 + line_count_match + usize::from(has_end_delimiter);
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(p.indent, p.kind, p.span, line_count)
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})
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}
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fn new(line: &str) -> Self {
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let start = line
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.chars()
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.take_while(|c| *c != '\n' && c.is_whitespace())
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.count();
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let line_t = &line[start..];
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let mut chars = line_t.chars();
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let mut fence = None;
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let (kind, span) = match chars.next().unwrap_or(EOF) {
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EOF => Some((Block::Atom(Blankline), Span::empty_at(start))),
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'\n' => Some((Block::Atom(Blankline), Span::by_len(start, 1))),
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'#' => chars
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.find(|c| *c != '#')
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.map_or(true, char::is_whitespace)
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.then(|| {
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(
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Block::Leaf(Heading),
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Span::by_len(start, line_t.len() - chars.as_str().len() - 1),
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)
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}),
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'>' => {
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if let Some(c) = chars.next() {
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c.is_whitespace().then(|| {
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(
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Block::Container(Blockquote),
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Span::by_len(start, line_t.len() - chars.as_str().len() - 1),
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)
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})
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} else {
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Some((
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Block::Container(Blockquote),
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Span::by_len(start, line_t.len() - chars.as_str().len()),
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))
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}
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}
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'|' => (&line_t[line_t.len() - 1..] == "|"
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&& &line_t[line_t.len() - 2..line_t.len() - 1] != "\\")
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.then(|| (Block::Leaf(Table), Span::by_len(start, 1))),
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'[' => chars.as_str().find("]:").map(|l| {
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let tag = &chars.as_str()[0..l];
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let (tag, is_footnote) = if let Some(tag) = tag.strip_prefix('^') {
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(tag, true)
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} else {
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(tag, false)
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};
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dbg!(line, line_t, tag);
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(
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if is_footnote {
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Block::Container(Footnote)
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} else {
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Block::Leaf(LinkDefinition)
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},
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Span::from_slice(line, tag),
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)
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}),
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'-' | '*' if Self::is_thematic_break(chars.clone()) => Some((
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Block::Atom(ThematicBreak),
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Span::from_slice(line, line_t.trim()),
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)),
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'-' => chars.next().map_or(true, char::is_whitespace).then(|| {
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let task_list = chars.next() == Some('[')
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&& matches!(chars.next(), Some('X' | ' '))
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&& chars.next() == Some(']')
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&& chars.next().map_or(true, char::is_whitespace);
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(
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Block::Container(ListItem),
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Span::by_len(start, if task_list { 3 } else { 1 }),
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)
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}),
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'+' | '*' | ':' if chars.next().map_or(true, char::is_whitespace) => {
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Some((Block::Container(ListItem), Span::by_len(start, 1)))
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}
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f @ ('`' | ':' | '~') => {
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let fence_length = (&mut chars).take_while(|c| *c == f).count() + 1;
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fence = Some((f, fence_length));
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let lang = line_t[fence_length..].trim();
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let valid_spec =
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!lang.chars().any(char::is_whitespace) && !lang.chars().any(|c| c == '`');
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(valid_spec && fence_length >= 3).then(|| {
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(
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match f {
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':' => Block::Container(Div),
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_ => Block::Leaf(CodeBlock),
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},
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Span::from_slice(line, lang),
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)
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})
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}
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_ => None,
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}
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.unwrap_or((Block::Leaf(Paragraph), Span::new(0, 0)));
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Self {
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indent: start,
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kind,
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span,
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fence,
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}
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}
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fn is_thematic_break(chars: std::str::Chars) -> bool {
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let mut n = 1;
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for c in chars {
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if matches!(c, '-' | '*') {
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n += 1;
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} else if !c.is_whitespace() {
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return false;
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}
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}
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n >= 3
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}
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/// Determine if this line continues the block.
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fn continues(&mut self, line: &str) -> bool {
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match self.kind {
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Block::Atom(..) => false,
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Block::Leaf(Paragraph | Heading | Table) => !line.trim().is_empty(),
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Block::Leaf(LinkDefinition) => line.starts_with(' ') && !line.trim().is_empty(),
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Block::Container(Blockquote) => line.trim().starts_with('>'),
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Block::Container(Footnote | ListItem) => {
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let spaces = line.chars().take_while(|c| c.is_whitespace()).count();
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line.trim().is_empty() || spaces > self.indent
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}
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Block::Container(Div) | Block::Leaf(CodeBlock) => {
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let (fence, fence_length) = self.fence.unwrap();
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let mut c = line.chars();
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!((&mut c).take(fence_length).all(|c| c == fence)
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&& c.next().map_or(true, char::is_whitespace))
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}
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}
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}
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}
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impl std::fmt::Display for Block {
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fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
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match self {
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Block::Atom(a) => std::fmt::Debug::fmt(a, f),
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Block::Leaf(e) => std::fmt::Debug::fmt(e, f),
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Block::Container(c) => std::fmt::Debug::fmt(c, f),
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}
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}
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}
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impl std::fmt::Display for Atom {
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fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
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write!(f, "Inline")
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}
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}
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/// Similar to `std::str::split('\n')` but newline is included and spans are used instead of `str`.
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fn lines(src: &str) -> impl Iterator<Item = Span> + '_ {
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let mut chars = src.chars();
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std::iter::from_fn(move || {
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if chars.as_str().is_empty() {
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None
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} else {
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let start = src.len() - chars.as_str().len();
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chars.find(|c| *c == '\n');
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let end = src.len() - chars.as_str().len();
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if start == end {
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None
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} else {
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Some(Span::new(start, end))
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}
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}
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})
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}
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#[cfg(test)]
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mod test {
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use crate::tree::EventKind;
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use crate::tree::EventKind::*;
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use super::Atom::*;
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use super::Block;
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use super::Block::*;
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use super::Container::*;
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use super::Leaf::*;
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macro_rules! test_parse {
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($src:expr $(,$($event:expr),* $(,)?)?) => {
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let t = super::TreeParser::new($src).parse();
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let actual = t.map(|ev| (ev.kind, ev.span.of($src))).collect::<Vec<_>>();
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let expected = &[$($($event),*,)?];
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assert_eq!(actual, expected, "\n\n{}\n\n", $src);
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};
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}
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#[test]
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fn parse_para_oneline() {
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test_parse!(
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"para\n",
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(Enter(Leaf(Paragraph)), ""),
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(EventKind::Atom(Inline), "para"),
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(Exit(Leaf(Paragraph)), ""),
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);
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}
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#[test]
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fn parse_para_multiline() {
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test_parse!(
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"para0\npara1\n",
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(Enter(Leaf(Paragraph)), ""),
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(EventKind::Atom(Inline), "para0\n"),
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(EventKind::Atom(Inline), "para1"),
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(Exit(Leaf(Paragraph)), ""),
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);
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}
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#[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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(Enter(Leaf(Heading)), "#"),
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(EventKind::Atom(Inline), "2"),
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(Exit(Leaf(Heading)), "#"),
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(EventKind::Atom(Blankline), "\n"),
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(Enter(Leaf(Heading)), "#"),
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(EventKind::Atom(Inline), "8\n"),
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(EventKind::Atom(Inline), " 12\n"),
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(EventKind::Atom(Inline), "15"),
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(Exit(Leaf(Heading)), "#"),
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);
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}
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#[test]
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fn parse_blockquote() {
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test_parse!(
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"> a\n",
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(Enter(Container(Blockquote)), ">"),
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(Enter(Leaf(Paragraph)), ""),
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(EventKind::Atom(Inline), "a"),
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(Exit(Leaf(Paragraph)), ""),
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(Exit(Container(Blockquote)), ">"),
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);
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test_parse!(
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"> \n",
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(Enter(Container(Blockquote)), ">"),
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(EventKind::Atom(Blankline), "\n"),
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(Exit(Container(Blockquote)), ">"),
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);
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test_parse!(
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">",
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(Enter(Container(Blockquote)), ">"),
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(EventKind::Atom(Blankline), ""),
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(Exit(Container(Blockquote)), ">"),
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);
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test_parse!(
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concat!(
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"> a\n",
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">\n",
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"> ## hl\n",
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">\n",
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"> para\n", //
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),
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(Enter(Container(Blockquote)), ">"),
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(Enter(Leaf(Paragraph)), ""),
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(EventKind::Atom(Inline), "a"),
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(Exit(Leaf(Paragraph)), ""),
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(EventKind::Atom(Blankline), "\n"),
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(Enter(Leaf(Heading)), "##"),
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(EventKind::Atom(Inline), "hl"),
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(Exit(Leaf(Heading)), "##"),
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(EventKind::Atom(Blankline), "\n"),
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(Enter(Leaf(Paragraph)), ""),
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(EventKind::Atom(Inline), "para"),
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(Exit(Leaf(Paragraph)), ""),
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(Exit(Container(Blockquote)), ">"),
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);
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}
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#[test]
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fn parse_blockquote_empty() {
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test_parse!(
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"> \n",
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(Enter(Container(Blockquote)), ">"),
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(EventKind::Atom(Blankline), "\n"),
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(Exit(Container(Blockquote)), ">"),
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);
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test_parse!(
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">",
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(Enter(Container(Blockquote)), ">"),
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(EventKind::Atom(Blankline), ""),
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(Exit(Container(Blockquote)), ">"),
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);
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}
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#[test]
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fn parse_code_block() {
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test_parse!(
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concat!("```\n", "l0\n"),
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(Enter(Leaf(CodeBlock)), "",),
|
|
(EventKind::Atom(Inline), "l0\n"),
|
|
(Exit(Leaf(CodeBlock)), "",),
|
|
);
|
|
test_parse!(
|
|
concat!(
|
|
"```\n",
|
|
"l0\n",
|
|
"```\n",
|
|
"\n",
|
|
"para\n", //
|
|
),
|
|
(Enter(Leaf(CodeBlock)), ""),
|
|
(EventKind::Atom(Inline), "l0\n"),
|
|
(Exit(Leaf(CodeBlock)), ""),
|
|
(EventKind::Atom(Blankline), "\n"),
|
|
(Enter(Leaf(Paragraph)), ""),
|
|
(EventKind::Atom(Inline), "para"),
|
|
(Exit(Leaf(Paragraph)), ""),
|
|
);
|
|
test_parse!(
|
|
concat!(
|
|
"```` lang\n",
|
|
"l0\n",
|
|
"```\n",
|
|
" l1\n",
|
|
"````", //
|
|
),
|
|
(Enter(Leaf(CodeBlock)), "lang"),
|
|
(EventKind::Atom(Inline), "l0\n"),
|
|
(EventKind::Atom(Inline), "```\n"),
|
|
(EventKind::Atom(Inline), " l1\n"),
|
|
(Exit(Leaf(CodeBlock)), "lang"),
|
|
);
|
|
test_parse!(
|
|
concat!(
|
|
"```\n", //
|
|
"a\n", //
|
|
"```\n", //
|
|
"```\n", //
|
|
"bbb\n", //
|
|
"```\n", //
|
|
),
|
|
(Enter(Leaf(CodeBlock)), ""),
|
|
(EventKind::Atom(Inline), "a\n"),
|
|
(Exit(Leaf(CodeBlock)), ""),
|
|
(Enter(Leaf(CodeBlock)), ""),
|
|
(EventKind::Atom(Inline), "bbb\n"),
|
|
(Exit(Leaf(CodeBlock)), ""),
|
|
);
|
|
test_parse!(
|
|
concat!(
|
|
"~~~\n",
|
|
"code\n",
|
|
" block\n",
|
|
"~~~\n", //
|
|
),
|
|
(Enter(Leaf(CodeBlock)), "",),
|
|
(EventKind::Atom(Inline), "code\n"),
|
|
(EventKind::Atom(Inline), " block\n"),
|
|
(Exit(Leaf(CodeBlock)), "",),
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn parse_link_definition() {
|
|
test_parse!(
|
|
"[tag]: url\n",
|
|
(Enter(Leaf(LinkDefinition)), "tag"),
|
|
(EventKind::Atom(Inline), "url"),
|
|
(Exit(Leaf(LinkDefinition)), "tag"),
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn parse_footnote() {
|
|
test_parse!(
|
|
"[^tag]: description\n",
|
|
(Enter(Container(Footnote)), "tag"),
|
|
(Enter(Leaf(Paragraph)), ""),
|
|
(EventKind::Atom(Inline), "description"),
|
|
(Exit(Leaf(Paragraph)), ""),
|
|
(Exit(Container(Footnote)), "tag"),
|
|
);
|
|
}
|
|
|
|
macro_rules! test_block {
|
|
($src:expr, $kind:expr, $str:expr, $len:expr $(,)?) => {
|
|
let lines = super::lines($src).map(|sp| sp.of($src));
|
|
let (_indent, kind, sp, len) = super::BlockParser::parse(lines).unwrap();
|
|
assert_eq!(
|
|
(kind, sp.of($src), len),
|
|
($kind, $str, $len),
|
|
"\n\n{}\n\n",
|
|
$src
|
|
);
|
|
};
|
|
}
|
|
|
|
#[test]
|
|
fn block_blankline() {
|
|
test_block!("\n", Block::Atom(Blankline), "\n", 1);
|
|
test_block!(" \n", Block::Atom(Blankline), "\n", 1);
|
|
}
|
|
|
|
#[test]
|
|
fn block_multiline() {
|
|
test_block!("# heading\n spanning two lines\n", Leaf(Heading), "#", 2);
|
|
}
|
|
|
|
#[test]
|
|
fn block_blockquote() {
|
|
test_block!(
|
|
concat!(
|
|
"> a\n", //
|
|
">\n", //
|
|
" > b\n", //
|
|
">\n", //
|
|
"> c\n", //
|
|
),
|
|
Block::Container(Blockquote),
|
|
">",
|
|
5,
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn block_thematic_break() {
|
|
test_block!("---\n", Block::Atom(ThematicBreak), "---", 1);
|
|
test_block!(
|
|
concat!(
|
|
" -*- -*-\n",
|
|
"\n", //
|
|
"para", //
|
|
),
|
|
Block::Atom(ThematicBreak),
|
|
"-*- -*-",
|
|
1
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn block_code_block() {
|
|
test_block!(
|
|
concat!(
|
|
"```` lang\n",
|
|
"l0\n",
|
|
"```\n",
|
|
" l1\n",
|
|
"````", //
|
|
),
|
|
Leaf(CodeBlock),
|
|
"lang",
|
|
5,
|
|
);
|
|
test_block!(
|
|
concat!(
|
|
"```\n", //
|
|
"a\n", //
|
|
"```\n", //
|
|
"```\n", //
|
|
"bbb\n", //
|
|
"```\n", //
|
|
),
|
|
Leaf(CodeBlock),
|
|
"",
|
|
3,
|
|
);
|
|
test_block!(
|
|
concat!(
|
|
"``` no space in lang specifier\n",
|
|
"l0\n",
|
|
"```\n", //
|
|
),
|
|
Leaf(Paragraph),
|
|
"",
|
|
3,
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn block_link_definition() {
|
|
test_block!("[tag]: url\n", Leaf(LinkDefinition), "tag", 1);
|
|
test_block!(
|
|
concat!(
|
|
"[tag]: uuu\n",
|
|
" rl\n", //
|
|
),
|
|
Leaf(LinkDefinition),
|
|
"tag",
|
|
2,
|
|
);
|
|
test_block!(
|
|
concat!(
|
|
"[tag]: url\n",
|
|
"para\n", //
|
|
),
|
|
Leaf(LinkDefinition),
|
|
"tag",
|
|
1,
|
|
);
|
|
}
|
|
}
|