Handle rename symbols in ts_language APIs

test/runtime/language_test.cc

@@ -0,0 +1,54 @@
+#include "test_helper.h"
+#include "runtime/alloc.h"
+#include "helpers/load_language.h"
+
+START_TEST
+
+describe("Language", []() {
+  describe("symbol_name(TSSymbol symbol)", [&]() {
+    it("returns the correct name for renamed nodes", [&]() {
+      TSCompileResult compile_result = ts_compile_grammar(R"JSON({
+        "name": "renamed_rules",
+
+        "rules": {
+          "a": {
+            "type": "RENAME",
+            "value": "c",
+            "content": {
+              "type": "SYMBOL",
+              "name": "b"
+            }
+          },
+
+          "b": {
+            "type": "STRING",
+            "value": "b"
+          }
+        }
+      })JSON");
+
+      TSDocument *document = ts_document_new();
+      const TSLanguage *language =  load_test_language("renamed_rules", compile_result);
+      ts_document_set_language(document, language);
+      ts_document_set_input_string(document, "b");
+      ts_document_parse(document);
+
+      TSNode root_node = ts_document_root_node(document);
+      char *string = ts_node_string(root_node, document);
+      AssertThat(string, Equals("(a (c))"));
+
+      TSNode renamed_node = ts_node_child(root_node, 0);
+      AssertThat(ts_node_type(renamed_node, document), Equals("c"));
+
+      TSSymbol renamed_symbol = ts_node_symbol(renamed_node);
+      AssertThat(ts_language_symbol_count(language), IsGreaterThan(renamed_symbol));
+      AssertThat(ts_language_symbol_name(language, renamed_symbol), Equals("c"));
+      AssertThat(ts_language_symbol_type(language, renamed_symbol), Equals(TSSymbolTypeRegular));
+
+      ts_free(string);
+      ts_document_free(document);
+    });
+  });
+});
+
+END_TEST