editor add syntax highlighting using treesitter

1 files changed, 75 insertions, 0 deletions

diff --git a/src/widgets/luaeditor/treesitter.rs b/src/widgets/luaeditor/treesitter.rs
new file mode 100644
index 0000000..57013f9
--- /dev/null
+++ b/src/widgets/luaeditor/treesitter.rs
@@ -0,0 +1,75 @@
+use tree_sitter_highlight::{Highlight, HighlightConfiguration, HighlightEvent, Highlighter};
+
+static HIGHLIGHT_NAMES: [&'static str; 29] = [
+    "attribute",
+    "boolean",
+    "comment",
+    "conditional",
+    "constant",
+    "constant.builtin",
+    "constructor",
+    "field",
+    "function",
+    "function.builtin",
+    "function.call",
+    "keyword",
+    "keyword.function",
+    "keyword.operator",
+    "keyword.return",
+    "label",
+    "method",
+    "method.call",
+    "number",
+    "operator",
+    "parameter",
+    "preproc",
+    "punctuation.bracket",
+    "punctuation.delimiter",
+    "repeat",
+    "string",
+    "string.escape",
+    "variable",
+    "variable.builtin",
+];
+
+pub fn new_highlight_configuration() -> HighlightConfiguration {
+    let mut highlight_config = HighlightConfiguration::new(
+        tree_sitter_lua::language(),
+        "lua",
+        tree_sitter_lua::HIGHLIGHTS_QUERY,
+        tree_sitter_lua::INJECTIONS_QUERY,
+        tree_sitter_lua::LOCALS_QUERY,
+    )
+    .unwrap();
+
+    highlight_config.configure(&HIGHLIGHT_NAMES);
+
+    highlight_config
+}
+
+pub fn highlight_name(h: Highlight) -> &'static str {
+    HIGHLIGHT_NAMES[h.0]
+}
+
+pub fn highlighter_split<'a>(
+    s: &'a [u8],
+    config: &'a HighlightConfiguration,
+) -> Vec<(Option<Highlight>, &'a str)> {
+    let mut splits = Vec::new();
+    let mut current = None;
+
+    let mut highlighter = Highlighter::new();
+    let highlights = highlighter.highlight(config, s, None, |_| None).unwrap();
+
+    for event in highlights {
+        match event.unwrap() {
+            HighlightEvent::Source { start, end } => {
+                splits.push((current, std::str::from_utf8(&s[start..end]).unwrap()));
+            }
+            HighlightEvent::HighlightStart(s) => current = Some(s),
+            HighlightEvent::HighlightEnd => current = None,
+        }
+    }
+
+    splits
+}