Add wasm binding for running tree queries in a limited range

lib/binding_web/test/query-test.js

@@ -41,10 +41,7 @@ describe("Query", () => {
     `);
     const matches = query.exec(tree.rootNode);
     assert.deepEqual(
-      matches.map(({pattern, captures}) => ({
-        pattern,
-        captures: captures.map(({name, node}) => ({name, text: node.text}))
-      })),
+      formatMatches(matches),
       [
         {pattern: 0, captures: [{name: 'fn-def', text: 'one'}]},
         {pattern: 1, captures: [{name: 'fn-ref', text: 'two'}]},
@@ -52,4 +49,33 @@ describe("Query", () => {
       ]
     );
   });
+
+  it('matches queries in specified ranges',  () => {
+    tree = parser.parse("[a, b,\nc, d,\ne, f,\ng, h]");
+    query = JavaScript.query('(identifier) @element');
+    const matches = query.exec(
+      tree.rootNode,
+      {row: 1, column: 1},
+      {row: 3, column: 1}
+    );
+    assert.deepEqual(
+      formatMatches(matches),
+      [
+        {pattern: 0, captures: [{name: 'element', text: 'd'}]},
+        {pattern: 0, captures: [{name: 'element', text: 'e'}]},
+        {pattern: 0, captures: [{name: 'element', text: 'f'}]},
+        {pattern: 0, captures: [{name: 'element', text: 'g'}]},
+      ]
+    );
+  });
 });
+
+function formatMatches(matches) {
+  return matches.map(({pattern, captures}) => ({
+    pattern,
+    captures: captures.map(({name, node}) => ({
+      name,
+      text: node.text
+    }))
+  }))
+}