binding2/mdsal-binding2-generator-impl/src/main/java/org/opendaylight/mdsal/binding/javav2/generator/impl/AuxiliaryGenUtils.java

   1 /*
   2  * Copyright (c) 2017 Cisco Systems, Inc. and others.  All rights reserved.
   3  *
   4  * This program and the accompanying materials are made available under the
   5  * terms of the Eclipse Public License v1.0 which accompanies this distribution,
   6  * and is available at http://www.eclipse.org/legal/epl-v10.html
   7  */
   8
   9 package org.opendaylight.mdsal.binding.javav2.generator.impl;
  10
  11 import static org.opendaylight.mdsal.binding.javav2.generator.util.BindingGeneratorUtil.encodeAngleBrackets;
  12 import static org.opendaylight.mdsal.binding.javav2.generator.util.Types.BOOLEAN;
  13
  14 import com.google.common.annotations.Beta;
  15 import com.google.common.annotations.VisibleForTesting;
  16 import com.google.common.base.Splitter;
  17 import com.google.common.base.Strings;
  18 import com.google.common.collect.Iterables;
  19 import com.google.common.collect.Sets;
  20 import java.util.ArrayList;
  21 import java.util.List;
  22 import java.util.Map;
  23 import java.util.Set;
  24 import java.util.regex.Pattern;
  25 import org.opendaylight.mdsal.binding.javav2.generator.impl.txt.yangTemplateForModule;
  26 import org.opendaylight.mdsal.binding.javav2.generator.impl.txt.yangTemplateForNode;
  27 import org.opendaylight.mdsal.binding.javav2.generator.impl.util.YangTextTemplate;
  28 import org.opendaylight.mdsal.binding.javav2.generator.spi.TypeProvider;
  29 import org.opendaylight.mdsal.binding.javav2.generator.util.JavaIdentifier;
  30 import org.opendaylight.mdsal.binding.javav2.generator.util.NonJavaCharsConverter;
  31 import org.opendaylight.mdsal.binding.javav2.generator.util.Types;
  32 import org.opendaylight.mdsal.binding.javav2.generator.util.generated.type.builder.GeneratedTOBuilderImpl;
  33 import org.opendaylight.mdsal.binding.javav2.generator.yang.types.TypeProviderImpl;
  34 import org.opendaylight.mdsal.binding.javav2.model.api.AccessModifier;
  35 import org.opendaylight.mdsal.binding.javav2.model.api.Constant;
  36 import org.opendaylight.mdsal.binding.javav2.model.api.Type;
  37 import org.opendaylight.mdsal.binding.javav2.model.api.type.builder.EnumBuilder;
  38 import org.opendaylight.mdsal.binding.javav2.model.api.type.builder.GeneratedPropertyBuilder;
  39 import org.opendaylight.mdsal.binding.javav2.model.api.type.builder.GeneratedTOBuilder;
  40 import org.opendaylight.mdsal.binding.javav2.model.api.type.builder.GeneratedTypeBuilder;
  41 import org.opendaylight.mdsal.binding.javav2.model.api.type.builder.GeneratedTypeBuilderBase;
  42 import org.opendaylight.mdsal.binding.javav2.model.api.type.builder.MethodSignatureBuilder;
  43 import org.opendaylight.mdsal.binding.javav2.spec.runtime.BindingNamespaceType;
  44 import org.opendaylight.yangtools.yang.common.QName;
  45 import org.opendaylight.yangtools.yang.model.api.ContainerSchemaNode;
  46 import org.opendaylight.yangtools.yang.model.api.DataSchemaNode;
  47 import org.opendaylight.yangtools.yang.model.api.LeafSchemaNode;
  48 import org.opendaylight.yangtools.yang.model.api.ListSchemaNode;
  49 import org.opendaylight.yangtools.yang.model.api.Module;
  50 import org.opendaylight.yangtools.yang.model.api.NotificationDefinition;
  51 import org.opendaylight.yangtools.yang.model.api.RpcDefinition;
  52 import org.opendaylight.yangtools.yang.model.api.SchemaContext;
  53 import org.opendaylight.yangtools.yang.model.api.SchemaNode;
  54 import org.opendaylight.yangtools.yang.model.api.Status;
  55 import org.opendaylight.yangtools.yang.model.api.TypeDefinition;
  56 import org.opendaylight.yangtools.yang.model.api.UnknownSchemaNode;
  57 import org.opendaylight.yangtools.yang.model.api.type.BitsTypeDefinition;
  58 import org.opendaylight.yangtools.yang.model.api.type.EnumTypeDefinition;
  59 import org.opendaylight.yangtools.yang.model.api.type.UnionTypeDefinition;
  60 import org.opendaylight.yangtools.yang.model.util.SchemaContextUtil;
  61
  62 /**
  63  * Auxiliary util class for {@link GenHelperUtil} class
  64  */
  65 @Beta
  66 final class AuxiliaryGenUtils {
  67
  68     private static final Splitter BSDOT_SPLITTER = Splitter.on("\\.");
  69     private static final char NEW_LINE = '\n';
  70     private static final Pattern UNICODE_CHAR_PATTERN = Pattern.compile("\\\\+u");
  71
  72     /**
  73      * Constant with the concrete name of identifier.
  74      */
  75     private static final String AUGMENT_IDENTIFIER_NAME = "augment-identifier";
  76
  77     /**
  78      * Constant with the concrete name of namespace.
  79      */
  80     private static final String YANG_EXT_NAMESPACE = "urn:opendaylight:yang:extension:yang-ext";
  81
  82     private AuxiliaryGenUtils() {
  83         throw new UnsupportedOperationException("Util class");
  84     }
  85
  86     static void annotateDeprecatedIfNecessary(final Status status, final GeneratedTypeBuilder builder) {
  87         if (status == Status.DEPRECATED) {
  88             builder.addAnnotation("", "Deprecated");
  89         }
  90     }
  91
  92     private static boolean hasBuilderClass(final SchemaNode schemaNode) {
  93         if (schemaNode instanceof ContainerSchemaNode || schemaNode instanceof ListSchemaNode ||
  94                 schemaNode instanceof RpcDefinition || schemaNode instanceof NotificationDefinition) {
  95             return true;
  96         }
  97         return false;
  98     }
  99
 100     static Constant qNameConstant(final GeneratedTypeBuilderBase<?> toBuilder, final String constantName,
 101                                   final QName name) {
 102         return toBuilder.addConstant(Types.typeForClass(QName.class), constantName, name);
 103     }
 104
 105     /**
 106      * Created a method signature builder as part of
 107      * <code>interfaceBuilder</code>.
 108      *
 109      * The method signature builder is created for the getter method of
 110      * <code>schemaNodeName</code>. Also <code>comment</code> and
 111      * <code>returnType</code> information are added to the builder.
 112      *
 113      * @param interfaceBuilder
 114      *            generated type builder for which the getter method should be
 115      *            created
 116      * @param schemaNodeName
 117      *            string with schema node name. The name will be the part of the
 118      *            getter method name.
 119      * @param comment
 120      *            string with comment for the getter method
 121      * @param returnType
 122      *            type which represents the return type of the getter method
 123      * @param status
 124      *            status from yang file, for deprecated annotation
 125      * @return method signature builder which represents the getter method of
 126      *         <code>interfaceBuilder</code>
 127      */
 128     static MethodSignatureBuilder constructGetter(final GeneratedTypeBuilder interfaceBuilder,
 129                                                   final String schemaNodeName, final String comment, final Type returnType, final Status status) {
 130
 131         final MethodSignatureBuilder getMethod = interfaceBuilder
 132                 .addMethod(getterMethodName(schemaNodeName, returnType));
 133         if (status == Status.DEPRECATED) {
 134             getMethod.addAnnotation("", "Deprecated");
 135         }
 136         getMethod.setComment(encodeAngleBrackets(comment));
 137         getMethod.setReturnType(returnType);
 138         return getMethod;
 139     }
 140
 141     /**
 142      * Creates the name of the getter method name from <code>localName</code>.
 143      *
 144      * @param localName
 145      *            string with the name of the getter method
 146      * @param returnType
 147      *            return type
 148      * @return string with the name of the getter method for
 149      *         <code>methodName</code> in JAVA method format
 150      */
 151     private static String getterMethodName(final String localName, final Type returnType) {
 152         final StringBuilder method = new StringBuilder();
 153         if (BOOLEAN.equals(returnType)) {
 154             method.append("is");
 155         } else {
 156             method.append("get");
 157         }
 158         // underscore used as separator for distinction of method parts in convertIdentifier()
 159         method.append('_').append(localName);
 160         return NonJavaCharsConverter.convertIdentifier(method.toString(), JavaIdentifier.METHOD);
 161     }
 162
 163     static String createDescription(final SchemaNode schemaNode, final String fullyQualifiedName,
 164                                     final SchemaContext schemaContext, final boolean verboseClassComments) {
 165         final StringBuilder sb = new StringBuilder();
 166         final String nodeDescription = encodeAngleBrackets(schemaNode.getDescription());
 167         final String formattedDescription = YangTextTemplate.formatToParagraph(nodeDescription, 0);
 168
 169         if (!Strings.isNullOrEmpty(formattedDescription)) {
 170             sb.append(formattedDescription);
 171             sb.append(NEW_LINE);
 172         }
 173
 174         if (verboseClassComments) {
 175             final Module module = SchemaContextUtil.findParentModule(schemaContext, schemaNode);
 176             final StringBuilder linkToBuilderClass = new StringBuilder();
 177             final String[] namespace = Iterables.toArray(BSDOT_SPLITTER.split(fullyQualifiedName), String.class);
 178             final String className = namespace[namespace.length - 1];
 179
 180             if (hasBuilderClass(schemaNode)) {
 181                 linkToBuilderClass.append(className);
 182                 linkToBuilderClass.append("Builder");
 183             }
 184
 185             sb.append("<p>");
 186             sb.append("This class represents the following YANG schema fragment defined in module <b>");
 187             sb.append(module.getName());
 188             sb.append("</b>");
 189             sb.append(NEW_LINE);
 190             sb.append("<pre>");
 191             sb.append(NEW_LINE);
 192             sb.append(encodeAngleBrackets(yangTemplateForNode.render(schemaNode).body()));
 193             sb.append("</pre>");
 194             sb.append(NEW_LINE);
 195             sb.append("The schema path to identify an instance is");
 196             sb.append(NEW_LINE);
 197             sb.append("<i>");
 198             sb.append(YangTextTemplate.formatSchemaPath(module.getName(), schemaNode.getPath().getPathFromRoot()));
 199             sb.append("</i>");
 200             sb.append(NEW_LINE);
 201
 202             if (hasBuilderClass(schemaNode)) {
 203                 sb.append(NEW_LINE);
 204                 sb.append("<p>To create instances of this class use " + "{@link " + linkToBuilderClass + "}.");
 205                 sb.append(NEW_LINE);
 206                 sb.append("@see ");
 207                 sb.append(linkToBuilderClass);
 208                 sb.append(NEW_LINE);
 209                 if (schemaNode instanceof ListSchemaNode) {
 210                     final List<QName> keyDef = ((ListSchemaNode)schemaNode).getKeyDefinition();
 211                     if (keyDef != null && !keyDef.isEmpty()) {
 212                         sb.append("@see ");
 213                         sb.append(className);
 214                         sb.append("Key");
 215                     }
 216                     sb.append(NEW_LINE);
 217                 }
 218             }
 219         }
 220
 221         return replaceAllIllegalChars(sb);
 222     }
 223
 224     static String createDescription(final Module module, final boolean verboseClassComments) {
 225         final StringBuilder sb = new StringBuilder();
 226         final String moduleDescription = encodeAngleBrackets(module.getDescription());
 227         final String formattedDescription = YangTextTemplate.formatToParagraph(moduleDescription, 0);
 228
 229         if (!Strings.isNullOrEmpty(formattedDescription)) {
 230             sb.append(formattedDescription);
 231             sb.append(NEW_LINE);
 232         }
 233
 234         if (verboseClassComments) {
 235             sb.append("<p>");
 236             sb.append("This class represents the following YANG schema fragment defined in module <b>");
 237             sb.append(module.getName());
 238             sb.append("</b>");
 239             sb.append(NEW_LINE);
 240             sb.append("<pre>");
 241             sb.append(NEW_LINE);
 242             sb.append(encodeAngleBrackets(yangTemplateForModule.render(module).body()));
 243             sb.append("</pre>");
 244         }
 245
 246         return replaceAllIllegalChars(sb);
 247     }
 248
 249     /**
 250      * Returns first unique name for the augment generated type builder. The
 251      * generated type builder name for augment consists from name of augmented
 252      * node and serial number of its augmentation.
 253      *
 254      * @param builders
 255      *            map of builders which were created in the package to which the
 256      *            augmentation belongs
 257      * @param genTypeName
 258      *            string with name of augmented node
 259      * @return string with unique name for augmentation builder
 260      */
 261     static String augGenTypeName(final Map<String, GeneratedTypeBuilder> builders, final String genTypeName) {
 262         int index = 1;
 263         if (builders != null) {
 264             while (builders.containsKey(genTypeName + index)) {
 265                 index = index + 1;
 266             }
 267         }
 268         return genTypeName + index;
 269     }
 270
 271     /**
 272      * @param unknownSchemaNodes unknows schema nodes
 273      * @return nodeParameter of UnknownSchemaNode
 274      */
 275     static String getAugmentIdentifier(final List<UnknownSchemaNode> unknownSchemaNodes) {
 276         for (final UnknownSchemaNode unknownSchemaNode : unknownSchemaNodes) {
 277             final QName nodeType = unknownSchemaNode.getNodeType();
 278             if (AUGMENT_IDENTIFIER_NAME.equals(nodeType.getLocalName())
 279                     && YANG_EXT_NAMESPACE.equals(nodeType.getNamespace().toString())) {
 280                 return unknownSchemaNode.getNodeParameter();
 281             }
 282         }
 283         return null;
 284     }
 285
 286     /**
 287      * Adds enumeration builder created from <code>enumTypeDef</code> to
 288      * <code>typeBuilder</code>.
 289      *
 290      * Each <code>enumTypeDef</code> item is added to builder with its name and
 291      * value.
 292      *
 293      * @param enumTypeDef
 294      *            EnumTypeDefinition contains enum data
 295      * @param enumName
 296      *            string contains name which will be assigned to enumeration
 297      *            builder
 298      * @param typeBuilder
 299      *            GeneratedTypeBuilder to which will be enum builder assigned
 300      * @param module
 301      *            Module in which type should be generated
 302      * @return enumeration builder which contains data from
 303      *         <code>enumTypeDef</code>
 304      */
 305     static EnumBuilder resolveInnerEnumFromTypeDefinition(final EnumTypeDefinition enumTypeDef, final QName enumName,
 306         final Map<Module, ModuleContext> genCtx, final GeneratedTypeBuilder typeBuilder, final Module module) {
 307         if (enumTypeDef != null && typeBuilder != null && enumTypeDef.getQName().getLocalName() != null) {
 308             final EnumBuilder enumBuilder = typeBuilder.addEnumeration(enumName.getLocalName());
 309             final String enumTypedefDescription = encodeAngleBrackets(enumTypeDef.getDescription());
 310             enumBuilder.setDescription(enumTypedefDescription);
 311             enumBuilder.updateEnumPairsFromEnumTypeDef(enumTypeDef);
 312             final ModuleContext ctx = genCtx.get(module);
 313             ctx.addInnerTypedefType(enumTypeDef.getPath(), enumBuilder);
 314             return enumBuilder;
 315         }
 316         return null;
 317     }
 318
 319
 320     /**
 321      * Builds generated TO builders for <code>typeDef</code> of type
 322      * {@link UnionTypeDefinition} or {@link BitsTypeDefinition} which are
 323      * also added to <code>typeBuilder</code> as enclosing transfer object.
 324      *
 325      * If more then one generated TO builder is created for enclosing then all
 326      * of the generated TO builders are added to <code>typeBuilder</code> as
 327      * enclosing transfer objects.
 328      *
 329      * @param typeDef
 330      *            type definition which can be of type <code>UnionType</code> or
 331      *            <code>BitsTypeDefinition</code>
 332      * @param typeBuilder
 333      *            generated type builder to which is added generated TO created
 334      *            from <code>typeDef</code>
 335      * @param leaf
 336      *            string with name for generated TO builder
 337      * @param parentModule
 338      *            parent module
 339      * @return generated TO builder for <code>typeDef</code>
 340      */
 341     static GeneratedTOBuilder addTOToTypeBuilder(final TypeDefinition<?> typeDef, final GeneratedTypeBuilder
 342             typeBuilder, final DataSchemaNode leaf, final Module parentModule, final TypeProvider typeProvider,
 343             final SchemaContext schemaContext) {
 344         final String classNameFromLeaf = leaf.getQName().getLocalName();
 345         final List<GeneratedTOBuilder> genTOBuilders = new ArrayList<>();
 346         final String packageName = typeBuilder.getFullyQualifiedName();
 347         if (typeDef instanceof UnionTypeDefinition) {
 348             final List<GeneratedTOBuilder> types = ((TypeProviderImpl) typeProvider)
 349                     .provideGeneratedTOBuildersForUnionTypeDef(packageName, ((UnionTypeDefinition) typeDef),
 350                             classNameFromLeaf, leaf, schemaContext, ((TypeProviderImpl) typeProvider).getGenTypeDefsContextMap());
 351             genTOBuilders.addAll(types);
 352
 353             GeneratedTOBuilder resultTOBuilder;
 354             if (types.isEmpty()) {
 355                 throw new IllegalStateException("No GeneratedTOBuilder objects generated from union " + typeDef);
 356             }
 357             resultTOBuilder = types.remove(0);
 358             for (final GeneratedTOBuilder genTOBuilder : types) {
 359                 resultTOBuilder.addEnclosingTransferObject(genTOBuilder);
 360             }
 361
 362             final GeneratedPropertyBuilder genPropBuilder = resultTOBuilder.addProperty("value");
 363             genPropBuilder.setReturnType(Types.CHAR_ARRAY);
 364             resultTOBuilder.addEqualsIdentity(genPropBuilder);
 365             resultTOBuilder.addHashIdentity(genPropBuilder);
 366             resultTOBuilder.addToStringProperty(genPropBuilder);
 367
 368         } else if (typeDef instanceof BitsTypeDefinition) {
 369             genTOBuilders.add((((TypeProviderImpl) typeProvider)).provideGeneratedTOBuilderForBitsTypeDefinition(
 370                     packageName, typeDef, classNameFromLeaf, parentModule.getName()));
 371         }
 372         if (!genTOBuilders.isEmpty()) {
 373             for (final GeneratedTOBuilder genTOBuilder : genTOBuilders) {
 374                 typeBuilder.addEnclosingTransferObject(genTOBuilder);
 375             }
 376             return genTOBuilders.get(0);
 377         }
 378         return null;
 379
 380     }
 381
 382     @SuppressWarnings({ "unchecked", "rawtypes" })
 383     static Type createReturnTypeForUnion(final GeneratedTOBuilder genTOBuilder, final TypeDefinition<?> typeDef,
 384             final GeneratedTypeBuilder typeBuilder, final Module parentModule, final TypeProvider typeProvider) {
 385         final GeneratedTOBuilderImpl returnType = new GeneratedTOBuilderImpl(genTOBuilder.getPackageName(),
 386                 genTOBuilder.getName());
 387         final String typedefDescription = encodeAngleBrackets(typeDef.getDescription());
 388
 389         returnType.setDescription(typedefDescription);
 390         returnType.setReference(typeDef.getReference());
 391         returnType.setSchemaPath((List) typeDef.getPath().getPathFromRoot());
 392         returnType.setModuleName(parentModule.getName());
 393
 394         genTOBuilder.setTypedef(true);
 395         genTOBuilder.setIsUnion(true);
 396         TypeProviderImpl.addUnitsToGenTO(genTOBuilder, typeDef.getUnits());
 397
 398
 399
 400         final GeneratedTOBuilder unionBuilder = createUnionBuilder(genTOBuilder,typeBuilder);
 401
 402
 403         final MethodSignatureBuilder method = unionBuilder.addMethod("getDefaultInstance");
 404         method.setReturnType(returnType);
 405         method.addParameter(Types.STRING, "defaultValue");
 406         method.setAccessModifier(AccessModifier.PUBLIC);
 407         method.setStatic(true);
 408
 409         final Set<Type> types = ((TypeProviderImpl) typeProvider).getAdditionalTypes().get(parentModule);
 410         if (types == null) {
 411             ((TypeProviderImpl) typeProvider).getAdditionalTypes().put(parentModule,
 412                     Sets.newHashSet(unionBuilder.toInstance()));
 413         } else {
 414             types.add(unionBuilder.toInstance());
 415         }
 416         return returnType.toInstance();
 417     }
 418
 419     private static GeneratedTOBuilder createUnionBuilder(final GeneratedTOBuilder genTOBuilder, final GeneratedTypeBuilder typeBuilder) {
 420         final String outerCls = Types.getOuterClassName(genTOBuilder);
 421         final StringBuilder name;
 422         if (outerCls != null) {
 423             name = new StringBuilder(outerCls);
 424         } else {
 425             name = new StringBuilder();
 426         }
 427         name.append(genTOBuilder.getName());
 428         name.append("Builder");
 429         final GeneratedTOBuilderImpl unionBuilder = new GeneratedTOBuilderImpl(typeBuilder.getPackageName(),name.toString());
 430         unionBuilder.setIsUnionBuilder(true);
 431         return unionBuilder;
 432     }
 433
 434     static boolean isInnerType(final LeafSchemaNode leaf, final TypeDefinition<?> type) {
 435         if (leaf.getPath().equals(type.getPath())) {
 436             return true;
 437         }
 438         if (leaf.getPath().equals(type.getPath().getParent())) {
 439             return true;
 440         }
 441
 442         return false;
 443     }
 444
 445     /**
 446      * Generates for the <code>list</code> which contains any list keys special
 447      * generated TO builder.
 448      *
 449      * @param packageName
 450      *            string with package name to which the list belongs
 451      * @param list
 452      *            schema node of list
 453      * @return generated TO builder which represents the keys of the
 454      *         <code>list</code> or empty TO builder if <code>list</code> is null or list of
 455      *         key definitions is null or empty.
 456      */
 457     static GeneratedTOBuilder resolveListKeyTOBuilder(final String packageName, final ListSchemaNode list) {
 458         GeneratedTOBuilder genTOBuilder = null;
 459         if ((list.getKeyDefinition() != null) && (!list.getKeyDefinition().isEmpty())) {
 460             // underscore used as separator for distinction of class name parts
 461             final String genTOName =
 462                     new StringBuilder(list.getQName().getLocalName()).append('_').append(BindingNamespaceType.Key)
 463                             .toString();
 464             genTOBuilder =
 465                     new GeneratedTOBuilderImpl(new StringBuilder(packageName).append(".wrapper").toString(), genTOName);
 466         }
 467         return genTOBuilder;
 468     }
 469
 470     /**
 471      * Converts <code>leaf</code> schema node to property of generated TO
 472      * builder.
 473      *
 474      * @param toBuilder
 475      *            generated TO builder to which is <code>leaf</code> added as
 476      *            property
 477      * @param leaf
 478      *            leaf schema node which is added to <code>toBuilder</code> as
 479      *            property
 480      * @param returnType
 481      *            property type
 482      * @param isReadOnly
 483      *            boolean value which says if leaf property is|isn't read only
 484      * @return boolean value
 485      *         <ul>
 486      *         <li>false - if <code>leaf</code>, <code>toBuilder</code> or leaf
 487      *         name equals null or if leaf is added by <i>uses</i>.</li>
 488      *         <li>true - other cases</li>
 489      *         </ul>
 490      */
 491     static boolean resolveLeafSchemaNodeAsProperty(final GeneratedTOBuilder toBuilder, final LeafSchemaNode leaf,
 492         final Type returnType, final boolean isReadOnly) {
 493
 494         if (returnType == null) {
 495             return false;
 496         }
 497         final String leafName = leaf.getQName().getLocalName();
 498         final String leafDesc = encodeAngleBrackets(leaf.getDescription());
 499         final GeneratedPropertyBuilder propBuilder =
 500                 toBuilder.addProperty(NonJavaCharsConverter.convertIdentifier(leafName, JavaIdentifier.METHOD));
 501         propBuilder.setReadOnly(isReadOnly);
 502         propBuilder.setReturnType(returnType);
 503         propBuilder.setComment(leafDesc);
 504         toBuilder.addEqualsIdentity(propBuilder);
 505         toBuilder.addHashIdentity(propBuilder);
 506         toBuilder.addToStringProperty(propBuilder);
 507         return true;
 508     }
 509
 510     @VisibleForTesting
 511     public static String replaceAllIllegalChars(final StringBuilder stringBuilder){
 512         final String ret = UNICODE_CHAR_PATTERN.matcher(stringBuilder).replaceAll("\\\\\\\\u");
 513         return ret.isEmpty() ? "" : ret;
 514     }
 515 }