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//! Renders a bit of code as HTML.
use ide_db::base_db::SourceDatabase;
use oorandom::Rand32;
use stdx::format_to;
use syntax::AstNode;
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 {
let mut rng = Rand32::new(seed);
format!(
"hsl({h},{s}%,{l}%)",
h = rng.rand_range(0..361),
s = rng.rand_range(42..99),
l = rng.rand_range(40..91),
)
}
let hl_ranges = highlight(db, file_id, None, false);
let text = parse.tree().syntax().to_string();
let mut buf = String::new();
buf.push_str(STYLE);
buf.push_str("<pre><code>");
for r in &hl_ranges {
let chunk = html_escape(&text[r.range]);
if r.highlight.is_empty() {
format_to!(buf, "{}", chunk);
continue;
}
let class = r.highlight.to_string().replace('.', " ");
let color = match (rainbow, r.binding_hash) {
(true, Some(hash)) => {
format!(" data-binding-hash=\"{}\" style=\"color: {};\"", hash, rainbowify(hash))
}
_ => "".into(),
};
format_to!(buf, "<span class=\"{}\"{}>{}</span>", class, color, chunk);
}
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; }
.label { color: #DFAF8F; font-style: italic; }
.comment { color: #7F9F7F; }
.documentation { color: #629755; }
.intra_doc_link { font-style: italic; }
.injected { opacity: 0.65 ; }
.struct, .enum { color: #7CB8BB; }
.enum_variant { color: #BDE0F3; }
.string_literal { color: #CC9393; }
.field { color: #94BFF3; }
.function { color: #93E0E3; }
.function.unsafe { color: #BC8383; }
.trait.unsafe { color: #BC8383; }
.operator.unsafe { color: #BC8383; }
.parameter { color: #94BFF3; }
.text { color: #DCDCCC; }
.type { color: #7CB8BB; }
.builtin_type { color: #8CD0D3; }
.type_param { color: #DFAF8F; }
.attribute { color: #94BFF3; }
.numeric_literal { color: #BFEBBF; }
.bool_literal { color: #BFE6EB; }
.macro { color: #94BFF3; }
.module { color: #AFD8AF; }
.value_param { color: #DCDCCC; }
.variable { color: #DCDCCC; }
.format_specifier { color: #CC696B; }
.mutable { text-decoration: underline; }
.escape_sequence { color: #94BFF3; }
.keyword { color: #F0DFAF; font-weight: bold; }
.keyword.unsafe { color: #BC8383; font-weight: bold; }
.control { font-style: italic; }
.unresolved_reference { color: #FC5555; text-decoration: wavy underline; }
</style>
";
|
