test(flink): add flink visitor and listener test

test/parser/flinksql/listener.test.ts

@@ -1,6 +1,8 @@
-import SQLParser, { PlSqlParserListener } from '../../../src/parser/plsql';
-// todo 校验关键字提取
-describe('PLSQL Listener Tests', () => {
+import
+SQLParser, { FlinkSqlParserListener }
+    from '../../../src/parser/flinksql';
+
+describe('Flink SQL Listener Tests', () => {
     const expectTableName = 'user1';
     const sql = `select id,name,sex from ${expectTableName};`;
     const parser = new SQLParser();
@@ -9,8 +11,8 @@ describe('PLSQL Listener Tests', () => {
 
     test('Listener enterTableName', async () => {
         let result = '';
-        class MyListener extends PlSqlParserListener {
-            enterTable_ref_list(ctx): void {
+        class MyListener extends FlinkSqlParserListener {
+            enterTableExpression(ctx): void {
                 result = ctx.getText().toLowerCase();
             }
         }

test/parser/flinksql/visitor.test.ts

@@ -0,0 +1,27 @@
+import SQLParser, { FlinkSqlParserVisitor } from '../../../src/parser/flinksql';
+
+describe('Flink SQL Visitor Tests', () => {
+    const expectTableName = 'user1';
+    const sql = `select id,name,sex from ${expectTableName};`;
+    const parser = new SQLParser();
+
+    const parserTree = parser.parse(sql, (error) => {
+        console.log('Parse error:', error);
+    });
+
+    // console.log('Parser tree string:', parser.toString(parserTree));
+
+    test('Visitor visitTableName', () => {
+        let result = '';
+        class MyVisitor extends FlinkSqlParserVisitor {
+            visitTableExpression(ctx): void {
+                result = ctx.getText().toLowerCase();
+                super.visitTableExpression(ctx);
+            }
+        }
+        const visitor: any = new MyVisitor();
+        visitor.visit(parserTree);
+
+        expect(result).toBe(expectTableName);
+    });
+});