katana-document-viewer 0.1.0

use crate::export_inline_payload::InlineHtmlWriter;
use crate::theme::KdvThemeSnapshot;

pub(crate) struct NestedBlockquoteHtml;

impl NestedBlockquoteHtml {
    pub(crate) fn is_nested(text: &str) -> bool {
        text.lines()
            .filter_map(Self::line_parts)
            .any(|line| line.depth > 1)
    }

    pub(crate) fn append(html: &mut String, theme: &KdvThemeSnapshot, text: &str) {
        let mut current_depth = 0;
        for line in text.lines().filter_map(Self::line_parts) {
            while current_depth > line.depth {
                html.push_str("</blockquote>\n");
                current_depth -= 1;
            }
            while current_depth < line.depth {
                current_depth += 1;
                html.push_str(&format!(
                    "<blockquote data-kdv-blockquote=\"quote\" data-kdv-quote-depth=\"{current_depth}\">"
                ));
            }
            if !line.text.trim().is_empty() {
                html.push_str("<p>");
                InlineHtmlWriter::append_fragment(html, line.text, theme);
                html.push_str("</p>\n");
            }
        }
        while current_depth > 0 {
            html.push_str("</blockquote>\n");
            current_depth -= 1;
        }
    }

    fn line_parts(line: &str) -> Option<BlockquoteLine<'_>> {
        let mut rest = line.trim_start();
        let mut depth = 0;
        while let Some(stripped) = rest.strip_prefix('>') {
            depth += 1;
            rest = stripped.trim_start();
        }
        (depth > 0).then_some(BlockquoteLine { depth, text: rest })
    }
}

struct BlockquoteLine<'a> {
    depth: usize,
    text: &'a str,
}