feat: create query crate

crates/tinymist-query/src/selection_range.rs

@@ -0,0 +1,40 @@
+use crate::prelude::*;
+
+#[derive(Debug, Clone)]
+pub struct SelectionRangeRequest {
+    pub path: PathBuf,
+    pub positions: Vec<LspPosition>,
+    pub position_encoding: PositionEncoding,
+}
+
+pub fn selection_range(
+    world: &TypstSystemWorld,
+    req: SelectionRangeRequest,
+) -> Option<Vec<SelectionRange>> {
+    let source = get_suitable_source_in_workspace(world, &req.path).ok()?;
+
+    let mut ranges = Vec::new();
+    for position in req.positions {
+        let typst_offset =
+            lsp_to_typst::position_to_offset(position, req.position_encoding, &source);
+        let tree = LinkedNode::new(source.root());
+        let leaf = tree.leaf_at(typst_offset)?;
+        ranges.push(range_for_node(&source, req.position_encoding, &leaf));
+    }
+
+    Some(ranges)
+}
+
+fn range_for_node(
+    source: &Source,
+    position_encoding: PositionEncoding,
+    node: &LinkedNode,
+) -> SelectionRange {
+    let range = typst_to_lsp::range(node.range(), source, position_encoding);
+    SelectionRange {
+        range: range.raw_range,
+        parent: node
+            .parent()
+            .map(|node| Box::new(range_for_node(source, position_encoding, node))),
+    }
+}