Add this crate, and the language-specific crates for whichever languages you want
to parse, to your Cargo.toml:
[dependencies]
tree-sitter-highlight = "0.22.0"
tree-sitter-javascript = "0.21.3"Define the list of highlight names that you will recognize:
let highlight_names = [
"attribute",
"constant",
"function.builtin",
"function",
"keyword",
"operator",
"property",
"punctuation",
"punctuation.bracket",
"punctuation.delimiter",
"string",
"string.special",
"tag",
"type",
"type.builtin",
"variable",
"variable.builtin",
"variable.parameter",
];Create a highlighter. You need one of these for each thread that you're using for syntax highlighting:
use tree_sitter_highlight::Highlighter;
let mut highlighter = Highlighter::new();Load some highlighting queries from the queries directory of the language repository:
use tree_sitter_highlight::HighlightConfiguration;
let javascript_language = tree_sitter_javascript::language();
let mut javascript_config = HighlightConfiguration::new(
javascript_language,
"javascript",
tree_sitter_javascript::HIGHLIGHT_QUERY,
tree_sitter_javascript::INJECTIONS_QUERY,
tree_sitter_javascript::LOCALS_QUERY,
).unwrap();Configure the recognized names:
javascript_config.configure(&highlight_names);Highlight some code:
use tree_sitter_highlight::HighlightEvent;
let highlights = highlighter.highlight(
&javascript_config,
b"const x = new Y();",
None,
|_| None
).unwrap();
for event in highlights {
match event.unwrap() {
HighlightEvent::Source {start, end} => {
eprintln!("source: {}-{}", start, end);
},
HighlightEvent::HighlightStart(s) => {
eprintln!("highlight style started: {:?}", s);
},
HighlightEvent::HighlightEnd => {
eprintln!("highlight style ended");
},
}
}The last parameter to highlight is a language injection callback. This allows
other languages to be retrieved when Tree-sitter detects an embedded document
(for example, a piece of JavaScript code inside a script tag within HTML).