Mercurial > jdk8-mips64-public > langtools / file revision

 /*

  * Copyright (c) 2011, 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 7115050

  * @summary Add parser support for lambda expressions

  */

 import com.sun.source.util.JavacTask;

 import java.net.URI;

 import java.util.Arrays;

 import javax.tools.Diagnostic;

 import javax.tools.JavaCompiler;

 import javax.tools.JavaFileObject;

 import javax.tools.SimpleJavaFileObject;

 import javax.tools.StandardJavaFileManager;

 import javax.tools.ToolProvider;

 public class LambdaParserTest {

     static int checkCount = 0;

     enum LambdaKind {

         NILARY_EXPR("()->x"),

         NILARY_STMT("()->{ return x; }"),

         ONEARY_SHORT_EXPR("x->x"),

         ONEARY_SHORT_STMT("x->{ return x; }"),

         ONEARY_EXPR("(#M1 #T1 x)->x"),

         ONEARY_STMT("(#M1 #T1 x)->{ return x; }"),

         TWOARY_EXPR("(#M1 #T1 x, #M2 #T2 y)->x"),

         TWOARY_STMT("(#M1 #T1 x, #M2 #T2 y)->{ return x; }");

         String lambdaTemplate;

         LambdaKind(String lambdaTemplate) {

             this.lambdaTemplate = lambdaTemplate;

         }

         String getLambdaString(LambdaParameterKind pk1, LambdaParameterKind pk2,

                 ModifierKind mk1, ModifierKind mk2) {

             return lambdaTemplate.replaceAll("#M1", mk1.modifier)

                     .replaceAll("#M2", mk2.modifier)

                     .replaceAll("#T1", pk1.parameterType)

                     .replaceAll("#T2", pk2.parameterType);

         }

         int arity() {

             switch (this) {

                 case NILARY_EXPR:

                 case NILARY_STMT: return 0;

                 case ONEARY_SHORT_EXPR:

                 case ONEARY_SHORT_STMT:

                 case ONEARY_EXPR:

                 case ONEARY_STMT: return 1;

                 case TWOARY_EXPR:

                 case TWOARY_STMT: return 2;

                 default: throw new AssertionError("Invalid lambda kind " + this);

             }

         }

         boolean isShort() {

             return this == ONEARY_SHORT_EXPR ||

                     this == ONEARY_SHORT_STMT;

         }

     }

     enum LambdaParameterKind {

         IMPLICIT(""),

         EXPLIICT_SIMPLE("A"),

         EXPLICIT_VARARGS("A..."),

         EXPLICIT_GENERIC1("A<X>"),

         EXPLICIT_GENERIC3("A<? extends X, ? super Y>");

         String parameterType;

         LambdaParameterKind(String parameterType) {

             this.parameterType = parameterType;

         }

         boolean explicit() {

             return this != IMPLICIT;

         }

     }

     enum ModifierKind {

         NONE(""),

         FINAL("final"),

         PUBLIC("public");

         String modifier;

         ModifierKind(String modifier) {

             this.modifier = modifier;

         }

         boolean compatibleWith(LambdaParameterKind pk) {

             switch (this) {

                 case PUBLIC: return false;

                 case FINAL: return pk != LambdaParameterKind.IMPLICIT;

                 case NONE: return true;

                 default: throw new AssertionError("Invalid modifier kind " + this);

             }

         }

     }

     enum ExprKind {

         NONE("#L#S"),

         SINGLE_PAREN1("(#L#S)"),

         SINGLE_PAREN2("(#L)#S"),

         DOUBLE_PAREN1("((#L#S))"),

         DOUBLE_PAREN2("((#L)#S)"),

         DOUBLE_PAREN3("((#L))#S");

         String expressionTemplate;

         ExprKind(String expressionTemplate) {

             this.expressionTemplate = expressionTemplate;

         }

         String expressionString(LambdaParameterKind pk1, LambdaParameterKind pk2,

                 ModifierKind mk1, ModifierKind mk2, LambdaKind lk, SubExprKind sk) {

             return expressionTemplate.replaceAll("#L", lk.getLambdaString(pk1, pk2, mk1, mk2))

                     .replaceAll("#S", sk.subExpression);

         }

     }

     enum SubExprKind {

         NONE(""),

         SELECT_FIELD(".f"),

         SELECT_METHOD(".f()"),

         SELECT_NEW(".new Foo()"),

         POSTINC("++"),

         POSTDEC("--");

         String subExpression;

         SubExprKind(String subExpression) {

             this.subExpression = subExpression;

         }

     }

     public static void main(String... args) throws Exception {

         //create default shared JavaCompiler - reused across multiple compilations

         JavaCompiler comp = ToolProvider.getSystemJavaCompiler();

         StandardJavaFileManager fm = comp.getStandardFileManager(null, null, null);

         for (LambdaKind lk : LambdaKind.values()) {

             for (LambdaParameterKind pk1 : LambdaParameterKind.values()) {

                 if (lk.arity() < 1 && pk1 != LambdaParameterKind.IMPLICIT) continue;

                 for (LambdaParameterKind pk2 : LambdaParameterKind.values()) {

                     if (lk.arity() < 2 && pk2 != LambdaParameterKind.IMPLICIT) continue;

                     for (ModifierKind mk1 : ModifierKind.values()) {

                         if (mk1 != ModifierKind.NONE && lk.isShort()) continue;

                         if (lk.arity() < 1 && mk1 != ModifierKind.NONE) continue;

                         for (ModifierKind mk2 : ModifierKind.values()) {

                             if (lk.arity() < 2 && mk2 != ModifierKind.NONE) continue;

                             for (SubExprKind sk : SubExprKind.values()) {

                                 for (ExprKind ek : ExprKind.values()) {

                                     new LambdaParserTest(pk1, pk2, mk1, mk2, lk, sk, ek)

                                             .run(comp, fm);

                                 }

                             }

                         }

                     }

                 }

             }

         }

         System.out.println("Total check executed: " + checkCount);

     }

     LambdaParameterKind pk1;

     LambdaParameterKind pk2;

     ModifierKind mk1;

     ModifierKind mk2;

     LambdaKind lk;

     SubExprKind sk;

     ExprKind ek;

     JavaSource source;

     DiagnosticChecker diagChecker;

     LambdaParserTest(LambdaParameterKind pk1, LambdaParameterKind pk2, ModifierKind mk1,

             ModifierKind mk2, LambdaKind lk, SubExprKind sk, ExprKind ek) {

         this.pk1 = pk1;

         this.pk2 = pk2;

         this.mk1 = mk1;

         this.mk2 = mk2;

         this.lk = lk;

         this.sk = sk;

         this.ek = ek;

         this.source = new JavaSource();

         this.diagChecker = new DiagnosticChecker();

     }

     class JavaSource extends SimpleJavaFileObject {

         String template = "class Test {\n" +

                           "   SAM s = #E;\n" +

                           "}";

         String source;

         public JavaSource() {

             super(URI.create("myfo:/Test.java"), JavaFileObject.Kind.SOURCE);

             source = template.replaceAll("#E", ek.expressionString(pk1, pk2, mk1, mk2, lk, sk));

         }

         @Override

         public CharSequence getCharContent(boolean ignoreEncodingErrors) {

             return source;

         }

     }

     void run(JavaCompiler tool, StandardJavaFileManager fm) throws Exception {

         JavacTask ct = (JavacTask)tool.getTask(null, fm, diagChecker,

                 Arrays.asList("-XDallowLambda"), null, Arrays.asList(source));

         try {

             ct.parse();

         } catch (Throwable ex) {

             throw new AssertionError("Error thrown when parsing the following source:\n" + source.getCharContent(true));

         }

         check();

     }

     void check() {

         checkCount++;

         boolean errorExpected = (lk.arity() > 0 && !mk1.compatibleWith(pk1)) ||

                 (lk.arity() > 1 && !mk2.compatibleWith(pk2));

         if (lk.arity() == 2 &&

                 (pk1.explicit() != pk2.explicit() ||

                 pk1 == LambdaParameterKind.EXPLICIT_VARARGS)) {

             errorExpected = true;

         }

         if (errorExpected != diagChecker.errorFound) {

             throw new Error("invalid diagnostics for source:\n" +

                 source.getCharContent(true) +

                 "\nFound error: " + diagChecker.errorFound +

                 "\nExpected error: " + errorExpected);

         }

     }

     static class DiagnosticChecker implements javax.tools.DiagnosticListener<JavaFileObject> {

         boolean errorFound;

         public void report(Diagnostic<? extends JavaFileObject> diagnostic) {

             if (diagnostic.getKind() == Diagnostic.Kind.ERROR) {

                 errorFound = true;

             }

         }

     }

 }