1//! Indented code block
2//!
3//! Parses anything indented with 4 spaces.
4//!
5//! <https://spec.commonmark.org/0.30/#indented-code-block>
6use crate::parser::block::{BlockRule, BlockState};
7use crate::{MarkdownIt, Node, NodeValue, Renderer};
8
9const CODE_INDENT: i32 = 4;
10
11#[derive(Debug)]
12pub struct CodeBlock {
13 pub content: String,
14}
15
16impl NodeValue for CodeBlock {
17 fn render(&self, node: &Node, fmt: &mut dyn Renderer) {
18 fmt.cr();
19 fmt.open("pre", &[]);
20 fmt.open("code", &node.attrs);
21 fmt.text(&self.content);
22 fmt.close("code");
23 fmt.close("pre");
24 fmt.cr();
25 }
26}
27
28pub fn add(md: &mut MarkdownIt) {
29 md.block.add_rule::<CodeScanner>();
30 md.max_indent = CODE_INDENT;
31}
32
33#[doc(hidden)]
34pub struct CodeScanner;
35impl BlockRule for CodeScanner {
36 fn check(_: &mut BlockState) -> Option<()> {
37 None
38 }
39
40 fn run(state: &mut BlockState) -> Option<(Node, usize)> {
41 if state.line_indent(state.line) < CODE_INDENT { return None; }
42
43 let mut next_line = state.line + 1;
44 let mut last = next_line;
45
46 while next_line < state.line_max {
47 if state.is_empty(next_line) {
48 next_line += 1;
49 continue;
50 }
51
52 if state.line_indent(next_line) >= CODE_INDENT {
53 next_line += 1;
54 last = next_line;
55 continue;
56 }
57
58 break;
59 }
60
61 let (mut content, _mapping) = state.get_lines(state.line, last, CODE_INDENT as usize + state.blk_indent, false);
62 content += "\n";
63
64 let node = Node::new(CodeBlock { content });
65 //node.srcmap = state.get_map_from_offsets(mapping[0].1, state.line_offsets[last - 1].line_end);
66
67 Some((node, last - state.line))
68 }
69}