feat(repl): add color to functions for syntax highlighting (denoland#…

…15434)

cli/tools/repl/editor.rs

@@ -304,7 +304,10 @@ impl Highlighter for EditorHelper {
  fn highlight<'l>(&self, line: &'l str, _: usize) -> Cow<'l, str> {
  let mut out_line = String::from(line);
 
- for item in deno_ast::lex(line, deno_ast::MediaType::TypeScript) {
+ let mut lexed_items = deno_ast::lex(line, deno_ast::MediaType::TypeScript)
+ .into_iter()
+ .peekable();
+ while let Some(item) = lexed_items.next() {
  // Adding color adds more bytes to the string,
  // so an offset is needed to stop spans falling out of sync.
  let offset = out_line.len() - line.len();
@@ -334,7 +337,17 @@ impl Highlighter for EditorHelper {
  } else if ident == *"async" || ident == *"of" {
  colors::cyan(&line[range]).to_string()
  } else {
- line[range].to_string()
+ let next = lexed_items.peek().map(|item| &item.inner);
+ if matches!(
+ next,
+ Some(deno_ast::TokenOrComment::Token(Token::LParen))
+ ) {
+ // We're looking for something that looks like a function
+ // We use a simple heuristic: 'ident' followed by 'LParen'
+ colors::intense_blue(&line[range]).to_string()
+ } else {
+ line[range].to_string()
+ }
  }
  }
  },