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//! Block quotes
//!
//! `> looks like this`
//!
//! <https://spec.commonmark.org/0.30/#block-quotes>
use crate::common::utils::find_indent_of;
use crate::parser::block::{BlockRule, BlockState};
use crate::{MarkdownIt, Node, NodeValue, Renderer};
#[derive(Debug)]
pub struct Blockquote;
impl NodeValue for Blockquote {
fn render(&self, node: &Node, fmt: &mut dyn Renderer) {
fmt.cr();
fmt.open("blockquote", &node.attrs);
fmt.cr();
fmt.contents(&node.children);
fmt.cr();
fmt.close("blockquote");
fmt.cr();
}
}
pub fn add(md: &mut MarkdownIt) {
md.block.add_rule::<BlockquoteScanner>();
}
#[doc(hidden)]
pub struct BlockquoteScanner;
impl BlockRule for BlockquoteScanner {
fn check(state: &mut BlockState) -> Option<()> {
if state.line_indent(state.line) >= state.md.max_indent { return None; }
// check the block quote marker
let Some('>') = state.get_line(state.line).chars().next() else { return None; };
Some(())
}
fn run(state: &mut BlockState) -> Option<(Node, usize)> {
Self::check(state)?;
let mut old_line_offsets = Vec::new();
let start_line = state.line;
let mut next_line = state.line;
let mut last_line_empty = false;
// Search the end of the block
//
// Block ends with either:
// 1. an empty line outside:
// ```
// > test
//
// ```
// 2. an empty line inside:
// ```
// >
// test
// ```
// 3. another tag:
// ```
// > test
// - - -
// ```
while next_line < state.line_max {
// check if it's outdented, i.e. it's inside list item and indented
// less than said list item:
//
// ```
// 1. anything
// > current blockquote
// 2. checking this line
// ```
let is_outdented = state.line_indent(next_line) < 0;
let line = state.get_line(next_line).to_owned();
let mut chars = line.chars();
match chars.next() {
None => {
// Case 1: line is not inside the blockquote, and this line is empty.
break;
}
Some('>') if !is_outdented => {
// This line is inside the blockquote.
// set offset past spaces and ">"
let offsets = &state.line_offsets[next_line];
let pos_after_marker = offsets.first_nonspace + 1;
old_line_offsets.push(state.line_offsets[next_line].clone());
let ( mut indent_after_marker, first_nonspace ) = find_indent_of(
&state.src[offsets.line_start..offsets.line_end],
pos_after_marker - offsets.line_start);
last_line_empty = first_nonspace == offsets.line_end - offsets.line_start;
// skip one optional space after '>'
if matches!(chars.next(), Some(' ' | '\t')) {
indent_after_marker -= 1;
}
state.line_offsets[next_line].indent_nonspace = indent_after_marker as i32;
state.line_offsets[next_line].first_nonspace = first_nonspace + state.line_offsets[next_line].line_start;
next_line += 1;
continue;
}
_ => {}
}
// Case 2: line is not inside the blockquote, and the last line was empty.
if last_line_empty { break; }
// Case 3: another tag found.
state.line = next_line;
if state.test_rules_at_line() {
// Quirk to enforce "hard termination mode" for paragraphs;
// normally if you call `nodeize(state, startLine, nextLine)`,
// paragraphs will look below nextLine for paragraph continuation,
// but if blockquote is terminated by another tag, they shouldn't
//state.line_max = next_line;
if state.blk_indent != 0 {
// state.blkIndent was non-zero, we now set it to zero,
// so we need to re-calculate all offsets to appear as
// if indent wasn't changed
old_line_offsets.push(state.line_offsets[next_line].clone());
state.line_offsets[next_line].indent_nonspace -= state.blk_indent as i32;
}
break;
}
old_line_offsets.push(state.line_offsets[next_line].clone());
// A negative indentation means that this is a paragraph continuation
//
state.line_offsets[next_line].indent_nonspace = -1;
next_line += 1;
}
let old_indent = state.blk_indent;
state.blk_indent = 0;
let old_node = std::mem::replace(&mut state.node, Node::new(Blockquote));
let old_line_max = state.line_max;
state.line = start_line;
state.line_max = next_line;
state.md.block.tokenize(state);
next_line = state.line;
state.line = start_line;
state.line_max = old_line_max;
// Restore original tShift; this might not be necessary since the parser
// has already been here, but just to make sure we can do that.
for (idx, line_offset) in old_line_offsets.iter_mut().enumerate() {
std::mem::swap(&mut state.line_offsets[idx + start_line], line_offset);
}
state.blk_indent = old_indent;
let node = std::mem::replace(&mut state.node, old_node);
Some((node, next_line - start_line))
}
}