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//! Renders a bit of code as HTML.
use ra_db::SourceDatabase;
use ra_syntax::{AstNode, TextRange, TextSize};
use crate::{syntax_highlighting::highlight, FileId, RootDatabase};
pub(crate) fn highlight_as_html(db: &RootDatabase, file_id: FileId, rainbow: bool) -> String {
let parse = db.parse(file_id);
fn rainbowify(seed: u64) -> String {
use rand::prelude::*;
let mut rng = SmallRng::seed_from_u64(seed);
format!(
"hsl({h},{s}%,{l}%)",
h = rng.gen_range::<u16, _, _>(0, 361),
s = rng.gen_range::<u16, _, _>(42, 99),
l = rng.gen_range::<u16, _, _>(40, 91),
)
}
let ranges = highlight(db, file_id, None);
let text = parse.tree().syntax().to_string();
let mut prev_pos = TextSize::from(0);
let mut buf = String::new();
buf.push_str(&STYLE);
buf.push_str("<pre><code>");
for range in &ranges {
if range.range.start() > prev_pos {
let curr = &text[TextRange::new(prev_pos, range.range.start())];
let text = html_escape(curr);
buf.push_str(&text);
}
let curr = &text[TextRange::new(range.range.start(), range.range.end())];
let class = range.highlight.to_string().replace('.', " ");
let color = match (rainbow, range.binding_hash) {
(true, Some(hash)) => {
format!(" data-binding-hash=\"{}\" style=\"color: {};\"", hash, rainbowify(hash))
}
_ => "".into(),
};
buf.push_str(&format!("<span class=\"{}\"{}>{}</span>", class, color, html_escape(curr)));
prev_pos = range.range.end();
}
// Add the remaining (non-highlighted) text
let curr = &text[TextRange::new(prev_pos, TextSize::of(&text))];
let text = html_escape(curr);
buf.push_str(&text);
buf.push_str("</code></pre>");
buf
}
//FIXME: like, real html escaping
fn html_escape(text: &str) -> String {
text.replace("<", "<").replace(">", ">")
}
const STYLE: &str = "
<style>
body { margin: 0; }
pre { color: #DCDCCC; background: #3F3F3F; font-size: 22px; padding: 0.4em; }
.lifetime { color: #DFAF8F; font-style: italic; }
.comment { color: #7F9F7F; }
.struct, .enum { color: #7CB8BB; }
.enum_variant { color: #BDE0F3; }
.string_literal { color: #CC9393; }
.field { color: #94BFF3; }
.function { color: #93E0E3; }
.parameter { color: #94BFF3; }
.text { color: #DCDCCC; }
.type { color: #7CB8BB; }
.builtin_type { color: #8CD0D3; }
.type_param { color: #DFAF8F; }
.attribute { color: #94BFF3; }
.numeric_literal { color: #BFEBBF; }
.macro { color: #94BFF3; }
.module { color: #AFD8AF; }
.variable { color: #DCDCCC; }
.format_specifier { color: #CC696B; }
.mutable { text-decoration: underline; }
.keyword { color: #F0DFAF; font-weight: bold; }
.keyword.unsafe { color: #BC8383; font-weight: bold; }
.control { font-style: italic; }
</style>
";
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