Crate tree_sitter_highlight

Tree-sitter Highlight

Usage

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",
    "comment",
    "constant",
    "constant.builtin",
    "constructor",
    "embedded",
    "function",
    "function.builtin",
    "keyword",
    "module",
    "number",
    "operator",
    "property",
    "property.builtin",
    "punctuation",
    "punctuation.bracket",
    "punctuation.delimiter",
    "punctuation.special",
    "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).

Re-exports

pub use c_lib as c;

Modules

c_lib

Structs

Highlight

Indicates which highlight should be applied to a region of source code.

HighlightConfiguration

Contains the data needed to highlight code written in a particular language.

Highlighter

Performs syntax highlighting, recognizing a given list of highlight names.

HtmlRenderer

Converts a general-purpose syntax highlighting iterator into a sequence of lines of HTML.

_QueryCaptures

Enums

Error

Represents the reason why syntax highlighting failed.

HighlightEvent

Represents a single step in rendering a syntax-highlighted document.