tree-sitter replaces ast-grep

crates/g3-core/examples/inspect_ast.rs

@@ -0,0 +1,58 @@
+//! Inspect tree-sitter AST structure for Rust code
+
+use tree_sitter::{Parser, Language};
+
+fn print_tree(node: tree_sitter::Node, source: &str, indent: usize) {
+    let indent_str = "  ".repeat(indent);
+    let node_text = &source[node.byte_range()];
+    let preview = if node_text.len() > 50 {
+        format!("{}...", &node_text[..50])
+    } else {
+        node_text.to_string()
+    };
+    
+    println!(
+        "{}{} [{}:{}] '{}'",
+        indent_str,
+        node.kind(),
+        node.start_position().row + 1,
+        node.start_position().column + 1,
+        preview.replace('\n', "\\n")
+    );
+    
+    let mut cursor = node.walk();
+    for child in node.children(&mut cursor) {
+        print_tree(child, source, indent + 1);
+    }
+}
+
+fn main() -> anyhow::Result<()> {
+    let source_code = r#"
+pub async fn example_async() {
+    println!("Hello");
+}
+
+fn regular_function() {
+    println!("Regular");
+}
+
+pub async fn another_async(x: i32) -> Result<(), ()> {
+    Ok(())
+}
+"#;
+
+    println!("Source code:");
+    println!("{}", source_code);
+    println!("\n{}", "=".repeat(80));
+    println!("AST Structure:");
+    println!("{}\n", "=".repeat(80));
+
+    let mut parser = Parser::new();
+    let language: Language = tree_sitter_rust::language().into();
+    parser.set_language(&language)?;
+
+    let tree = parser.parse(source_code, None).unwrap();
+    print_tree(tree.root_node(), source_code, 0);
+
+    Ok(())
+}