Expose cursor method in napi (#615)

.changeset/short-wombats-applaud.md

@@ -0,0 +1,5 @@
+---
+"@nomicfoundation/slang": patch
+---
+
+`cursor` method is now exposed in Typescript API

crates/codegen/parser/runtime/src/napi/napi_cst.rs

@@ -47,6 +47,7 @@ impl RuleNode {
             .collect()
     }
 
+    #[napi(getter)]
     pub fn cursor(&self) -> Cursor {
         Cursor::new(RustNode::Rule(self.0.clone()).cursor())
     }
@@ -74,6 +75,7 @@ impl TokenNode {
         self.0.text.clone()
     }
 
+    #[napi(getter)]
     pub fn cursor(&self) -> Cursor {
         Cursor::new(RustNode::Token(self.0.clone()).cursor())
     }

crates/solidity/outputs/npm/tests/src/cst-output.ts

@@ -39,6 +39,23 @@ test("parse rule", () => {
   }
 });
 
+test("trivial cursor access", () => {
+  const source = "int256 constant z = 1**2**3;";
+  const language = new Language("0.8.1");
+
+  const { parseTree } = language.parse(ProductionKind.SourceUnit, source);
+
+  let cursor = parseTree.cursor;
+  let node = cursor.node;
+  if (node instanceof RuleNode) {
+    expect(node.type).toEqual(NodeType.Rule);
+    expect(node.kind).toEqual(RuleKind.SourceUnit);
+    expect(node.children).toHaveLength(1);
+  } else {
+    fail("Expected RuleNode");
+  }
+});
+
 test("calculate unicode characters text length", () => {
   const source = `unicode"some 😁 emoji"`;
   const language = new Language("0.8.1");