8056897: Improve error recovery for empty binary and hexadecimal literals

Reviewed-by: mcimadamore

langtools/test/tools/javac/lexer/JavaLexerTest.java

@@ -0,0 +1,81 @@
+/*
+ * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+/**
+ * @test
+ * @bug 8056897
+ * @summary Proper lexing of integer literals.
+ */
+
+import java.io.IOException;
+import java.net.URI;
+import java.util.Objects;
+
+import javax.tools.JavaFileObject;
+import javax.tools.SimpleJavaFileObject;
+
+import com.sun.tools.javac.parser.JavaTokenizer;
+import com.sun.tools.javac.parser.ScannerFactory;
+import com.sun.tools.javac.parser.Tokens.Token;
+import com.sun.tools.javac.parser.Tokens.TokenKind;
+import com.sun.tools.javac.util.Context;
+import com.sun.tools.javac.util.Log;
+
+public class JavaLexerTest {
+    public static void main(String... args) throws Exception {
+        new JavaLexerTest().run();
+    }
+
+    void run() throws Exception {
+        Context ctx = new Context();
+        Log log = Log.instance(ctx);
+        String input = "0bL 0b20L 0xL ";
+        log.useSource(new SimpleJavaFileObject(new URI("mem://Test.java"), JavaFileObject.Kind.SOURCE) {
+            @Override
+            public CharSequence getCharContent(boolean ignoreEncodingErrors) throws IOException {
+                return input;
+            }
+        });
+        char[] inputArr = input.toCharArray();
+        JavaTokenizer tokenizer = new JavaTokenizer(ScannerFactory.instance(ctx), inputArr, inputArr.length) {
+        };
+
+        assertKind(input, tokenizer, TokenKind.LONGLITERAL, "0bL");
+        assertKind(input, tokenizer, TokenKind.LONGLITERAL, "0b20L");
+        assertKind(input, tokenizer, TokenKind.LONGLITERAL, "0xL");
+    }
+
+    void assertKind(String input, JavaTokenizer tokenizer, TokenKind kind, String expectedText) {
+        Token token = tokenizer.readToken();
+
+        if (token.kind != kind) {
+            throw new AssertionError("Unexpected token kind: " + token.kind);
+        }
+
+        String actualText = input.substring(token.pos, token.endPos);
+
+        if (!Objects.equals(actualText, expectedText)) {
+            throw new AssertionError("Unexpected token text: " + actualText);
+        }
+    }
+}