test: basic parser unit tests

test/common/basicParser.test.ts

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+import { CommonTokenStream } from 'antlr4ts';
+import { ErrorHandler, FlinkSQL } from '../../src';
+import { FlinkSqlLexer } from '../../src/lib/flinksql/FlinkSqlLexer';
+
+describe('BasicParser unit tests', () => {
+    const flinkParser = new FlinkSQL();
+    test('Create lexer', () => {
+        const sql = 'SELECT * FROM tb1';
+        const lexer = flinkParser.createLexer(sql);
+
+        expect(lexer).not.toBeUndefined();
+        expect(lexer).not.toBeNull();
+    });
+
+    test('Create lexer with errorHandler', () => {
+        const sql = '袋鼠云数栈UED团队';
+        const errors: any[] = [];
+        const errorHandler: ErrorHandler<any> = (err) => {
+            errors.push(err)
+        };
+        const lexer = flinkParser.createLexer(sql, errorHandler);
+        const tokenStream = new CommonTokenStream(lexer);
+        tokenStream.fill();
+        expect(errors.length).not.toBe(0);
+    });
+
+    test('Create parser', () => {
+        const sql = 'SELECT * FROM tb1';
+        const parser = flinkParser.createParser(sql);
+
+        expect(parser).not.toBeUndefined();
+        expect(parser).not.toBeNull();
+    });
+
+    test('Create parser with errorHandler (lexer error)', () => {
+        const sql = '袋鼠云数栈UED团队';
+        const errors: any[] = [];
+        const errorHandler: ErrorHandler<any> = (err) => {
+            errors.push(err);
+        };
+        const parser = flinkParser.createParser(sql, errorHandler);
+        parser.program();
+        expect(errors.length).not.toBe(0);
+    });
+
+    test('Create parser with errorHandler (parse error)', () => {
+        const sql = 'SHOW TA';
+        const errors: any[] = [];
+        const errorHandler: ErrorHandler<any> = (err) => {
+            errors.push(err);
+        };
+        const parser = flinkParser.createParser(sql, errorHandler);
+        parser.program();
+        expect(errors.length).not.toBe(0);
+    });
+
+    test('Parse right input', () => {
+        const sql = 'SELECT * FROM tb1';
+        const errors: any[] = [];
+        const errorHandler: ErrorHandler<any> = (err) => {
+            errors.push(err);
+        };
+        const parseTree = flinkParser.parse(sql, errorHandler);
+
+        expect(parseTree).not.toBeUndefined();
+        expect(parseTree).not.toBeNull();
+        expect(errors.length).toBe(0);
+    });
+
+    test('Parse wrong input', () => {
+        const sql = '袋鼠云数栈UED团队';
+        const errors: any[] = [];
+        const errorHandler: ErrorHandler<any> = (err) => {
+            errors.push(err);
+        };
+        const parseTree = flinkParser.parse(sql, errorHandler);
+
+        expect(parseTree).not.toBeUndefined();
+        expect(parseTree).not.toBeNull();
+        expect(errors.length).not.toBe(0);
+    });
+
+    test('Get All tokens', () => {
+        const sql = 'SELECT * FROM tbl1;';
+        const tokens = flinkParser.getAllTokens(sql);
+
+        expect(tokens.length).toBe(8);
+        expect(tokens[0].type).toBe(FlinkSqlLexer.KW_SELECT);
+        expect(tokens[1].type).toBe(FlinkSqlLexer.SPACE);
+        expect(tokens[2].type).toBe(FlinkSqlLexer.ASTERISK_SIGN);
+        expect(tokens[3].type).toBe(FlinkSqlLexer.SPACE);
+        expect(tokens[4].type).toBe(FlinkSqlLexer.KW_FROM);
+        expect(tokens[5].type).toBe(FlinkSqlLexer.SPACE);
+        expect(tokens[6].type).toBe(FlinkSqlLexer.ID_LITERAL);
+        expect(tokens[7].type).toBe(FlinkSqlLexer.SEMICOLON);
+    });
+
+    test('Get All tokens with error', () => {
+        const sql = '袋鼠云数栈UED团队';
+        const tokens = flinkParser.getAllTokens(sql);
+        expect(tokens.length).toBe(1);
+        expect(tokens[0].type).toBe(FlinkSqlLexer.ID_LITERAL);
+    });
+
+    test('Split sql', () => {
+        const sql = 'SHOW TABLES;\nSELECT * FROM tb;'
+        const sqlSlices = flinkParser.splitSQLByStatement(sql);
+
+        expect(sqlSlices.length).toBe(2);
+
+        expect(sqlSlices[0].text).toBe('SHOW TABLES;');
+        expect(sql.slice(sqlSlices[0].startIndex, sqlSlices[0].endIndex+1)).toBe(sqlSlices[0].text);
+        expect(sqlSlices[0].startLine).toBe(1);
+        expect(sqlSlices[0].endLine).toBe(1);
+
+        expect(sqlSlices[1].text).toBe('SELECT * FROM tb;');
+        expect(sql.slice(sqlSlices[1].startIndex, sqlSlices[1].endIndex+1)).toBe(sqlSlices[1].text);
+        expect(sqlSlices[1].startLine).toBe(2);
+        expect(sqlSlices[1].endLine).toBe(2);
+    });
+
+    test('Split sql with errors', () => {
+        const sql = 'SHOW TABLES;\nSELECT * FOM tb;'
+        const sqlSlices = flinkParser.splitSQLByStatement(sql);
+
+        expect(sqlSlices).toBeNull();
+    });
+
+});