jdk8-mips64-public/langtools: src/share/classes/com/sun/tools/doclint/Checker.java@fdfbc5f0c4ed (annotated)

src/share/classes/com/sun/tools/doclint/Checker.java@fdfbc5f0c4ed (annotated)

src/share/classes/com/sun/tools/doclint/Checker.java

Tue, 17 Sep 2013 14:17:13 -0700

author: jjg
date: Tue, 17 Sep 2013 14:17:13 -0700
changeset 2033: fdfbc5f0c4ed
parent 1917: 2fbe77c38802
child 2052: 503338f16d2b
permissions: -rw-r--r--

8024538: -Xdoclint + -Xprefer:source + incremental compilation == FAIL
Reviewed-by: darcy

 /*
  * Copyright (c) 2012, 2013, 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.  Oracle designates this
  * particular file as subject to the "Classpath" exception as provided
  * by Oracle in the LICENSE file that accompanied this code.
  *
  * 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.
  */
 package com.sun.tools.doclint;
 import java.io.IOException;
 import java.io.StringWriter;
 import java.net.URI;
 import java.net.URISyntaxException;
 import java.util.Deque;
 import java.util.EnumSet;
 import java.util.HashMap;
 import java.util.HashSet;
 import java.util.LinkedList;
 import java.util.List;
 import java.util.Map;
 import java.util.Set;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
 import javax.lang.model.element.Element;
 import javax.lang.model.element.ElementKind;
 import javax.lang.model.element.ExecutableElement;
 import javax.lang.model.element.Name;
 import javax.lang.model.type.TypeKind;
 import javax.lang.model.type.TypeMirror;
 import javax.tools.Diagnostic.Kind;
 import javax.tools.JavaFileObject;
 import com.sun.source.doctree.AttributeTree;
 import com.sun.source.doctree.AuthorTree;
 import com.sun.source.doctree.DocCommentTree;
 import com.sun.source.doctree.DocRootTree;
 import com.sun.source.doctree.DocTree;
 import com.sun.source.doctree.EndElementTree;
 import com.sun.source.doctree.EntityTree;
 import com.sun.source.doctree.ErroneousTree;
 import com.sun.source.doctree.IdentifierTree;
 import com.sun.source.doctree.InheritDocTree;
 import com.sun.source.doctree.LinkTree;
 import com.sun.source.doctree.LiteralTree;
 import com.sun.source.doctree.ParamTree;
 import com.sun.source.doctree.ReferenceTree;
 import com.sun.source.doctree.ReturnTree;
 import com.sun.source.doctree.SerialDataTree;
 import com.sun.source.doctree.SerialFieldTree;
 import com.sun.source.doctree.SinceTree;
 import com.sun.source.doctree.StartElementTree;
 import com.sun.source.doctree.TextTree;
 import com.sun.source.doctree.ThrowsTree;
 import com.sun.source.doctree.ValueTree;
 import com.sun.source.doctree.VersionTree;
 import com.sun.source.util.DocTreePath;
 import com.sun.source.util.DocTreePathScanner;
 import com.sun.source.util.TreePath;
 import com.sun.tools.doclint.HtmlTag.AttrKind;
 import com.sun.tools.javac.tree.DocPretty;
 import static com.sun.tools.doclint.Messages.Group.*;
 /**
  * Validate a doc comment.
  *
  * <p><b>This is NOT part of any supported API.
  * If you write code that depends on this, you do so at your own
  * risk.  This code and its internal interfaces are subject to change
  * or deletion without notice.</b></p>
  */
 public class Checker extends DocTreePathScanner<Void, Void> {
     final Env env;
     Set<Element> foundParams = new HashSet<>();
     Set<TypeMirror> foundThrows = new HashSet<>();
     Map<JavaFileObject, Set<String>> foundAnchors = new HashMap<>();
     boolean foundInheritDoc = false;
     boolean foundReturn = false;
     public enum Flag {
         TABLE_HAS_CAPTION,
         HAS_ELEMENT,
         HAS_INLINE_TAG,
         HAS_TEXT,
         REPORTED_BAD_INLINE
     }
     static class TagStackItem {
         final DocTree tree; // typically, but not always, StartElementTree
         final HtmlTag tag;
         final Set<HtmlTag.Attr> attrs;
         final Set<Flag> flags;
         TagStackItem(DocTree tree, HtmlTag tag) {
             this.tree = tree;
             this.tag = tag;
             attrs = EnumSet.noneOf(HtmlTag.Attr.class);
             flags = EnumSet.noneOf(Flag.class);
         }
         @Override
         public String toString() {
             return String.valueOf(tag);
         }
     }
     private Deque<TagStackItem> tagStack; // TODO: maybe want to record starting tree as well
     private HtmlTag currHeaderTag;
     private final int implicitHeaderLevel;
     // <editor-fold defaultstate="collapsed" desc="Top level">
     Checker(Env env) {
         env.getClass();
         this.env = env;
         tagStack = new LinkedList<>();
         implicitHeaderLevel = env.implicitHeaderLevel;
     }
     public Void scan(DocCommentTree tree, TreePath p) {
         env.setCurrent(p, tree);
         boolean isOverridingMethod = !env.currOverriddenMethods.isEmpty();
         if (p.getLeaf() == p.getCompilationUnit()) {
             // If p points to a compilation unit, the implied declaration is the
             // package declaration (if any) for the compilation unit.
             // Handle this case specially, because doc comments are only
             // expected in package-info files.
             JavaFileObject fo = p.getCompilationUnit().getSourceFile();
             boolean isPkgInfo = fo.isNameCompatible("package-info", JavaFileObject.Kind.SOURCE);
             if (tree == null) {
                 if (isPkgInfo)
                     reportMissing("dc.missing.comment");
                 return null;
             } else {
                 if (!isPkgInfo)
                     reportReference("dc.unexpected.comment");
             }
         } else {
             if (tree == null) {
                 if (!isSynthetic() && !isOverridingMethod)
                     reportMissing("dc.missing.comment");
                 return null;
             }
         }
         tagStack.clear();
         currHeaderTag = null;
         foundParams.clear();
         foundThrows.clear();
         foundInheritDoc = false;
         foundReturn = false;
         scan(new DocTreePath(p, tree), null);
         if (!isOverridingMethod) {
             switch (env.currElement.getKind()) {
                 case METHOD:
                 case CONSTRUCTOR: {
                     ExecutableElement ee = (ExecutableElement) env.currElement;
                     checkParamsDocumented(ee.getTypeParameters());
                     checkParamsDocumented(ee.getParameters());
                     switch (ee.getReturnType().getKind()) {
                         case VOID:
                         case NONE:
                             break;
                         default:
                             if (!foundReturn
                                     && !foundInheritDoc
                                     && !env.types.isSameType(ee.getReturnType(), env.java_lang_Void)) {
                                 reportMissing("dc.missing.return");
                             }
                     }
                     checkThrowsDocumented(ee.getThrownTypes());
                 }
             }
         }
         return null;
     }
     private void reportMissing(String code, Object... args) {
         env.messages.report(MISSING, Kind.WARNING, env.currPath.getLeaf(), code, args);
     }
     private void reportReference(String code, Object... args) {
         env.messages.report(REFERENCE, Kind.WARNING, env.currPath.getLeaf(), code, args);
     }
     @Override
     public Void visitDocComment(DocCommentTree tree, Void ignore) {
         super.visitDocComment(tree, ignore);
         for (TagStackItem tsi: tagStack) {
             if (tsi.tree.getKind() == DocTree.Kind.START_ELEMENT
                     && tsi.tag.endKind == HtmlTag.EndKind.REQUIRED) {
                 StartElementTree t = (StartElementTree) tsi.tree;
                 env.messages.error(HTML, t, "dc.tag.not.closed", t.getName());
             }
         }
         return null;
     }
     // </editor-fold>
     // <editor-fold defaultstate="collapsed" desc="Text and entities.">
     @Override
     public Void visitText(TextTree tree, Void ignore) {
         if (hasNonWhitespace(tree)) {
             checkAllowsText(tree);
             markEnclosingTag(Flag.HAS_TEXT);
         }
         return null;
     }
     @Override
     public Void visitEntity(EntityTree tree, Void ignore) {
         checkAllowsText(tree);
         markEnclosingTag(Flag.HAS_TEXT);
         String name = tree.getName().toString();
         if (name.startsWith("#")) {
             int v = name.toLowerCase().startsWith("#x")
                     ? Integer.parseInt(name.substring(2), 16)
                     : Integer.parseInt(name.substring(1), 10);
             if (!Entity.isValid(v)) {
                 env.messages.error(HTML, tree, "dc.entity.invalid", name);
             }
         } else if (!Entity.isValid(name)) {
             env.messages.error(HTML, tree, "dc.entity.invalid", name);
         }
         return null;
     }
     void checkAllowsText(DocTree tree) {
         TagStackItem top = tagStack.peek();
         if (top != null
                 && top.tree.getKind() == DocTree.Kind.START_ELEMENT
                 && !top.tag.acceptsText()) {
             if (top.flags.add(Flag.REPORTED_BAD_INLINE)) {
                 env.messages.error(HTML, tree, "dc.text.not.allowed",
                         ((StartElementTree) top.tree).getName());
             }
         }
     }
     // </editor-fold>
     // <editor-fold defaultstate="collapsed" desc="HTML elements">
     @Override
     public Void visitStartElement(StartElementTree tree, Void ignore) {
         markEnclosingTag(Flag.HAS_ELEMENT);
         final Name treeName = tree.getName();
         final HtmlTag t = HtmlTag.get(treeName);
         if (t == null) {
             env.messages.error(HTML, tree, "dc.tag.unknown", treeName);
         } else {
             boolean done = false;
             for (TagStackItem tsi: tagStack) {
                 if (tsi.tag.accepts(t)) {
                     while (tagStack.peek() != tsi) tagStack.pop();
                     done = true;
                     break;
                 } else if (tsi.tag.endKind != HtmlTag.EndKind.OPTIONAL) {
                     done = true;
                     break;
                 }
             }
             if (!done && HtmlTag.BODY.accepts(t)) {
                 tagStack.clear();
             }
             checkStructure(tree, t);
             // tag specific checks
             switch (t) {
                 // check for out of sequence headers, such as <h1>...</h1>  <h3>...</h3>
                 case H1: case H2: case H3: case H4: case H5: case H6:
                     checkHeader(tree, t);
                     break;
             }
             if (t.flags.contains(HtmlTag.Flag.NO_NEST)) {
                 for (TagStackItem i: tagStack) {
                     if (t == i.tag) {
                         env.messages.warning(HTML, tree, "dc.tag.nested.not.allowed", treeName);
                         break;
                     }
                 }
             }
         }
         // check for self closing tags, such as <a id="name"/>
         if (tree.isSelfClosing()) {
             env.messages.error(HTML, tree, "dc.tag.self.closing", treeName);
         }
         try {
             TagStackItem parent = tagStack.peek();
             TagStackItem top = new TagStackItem(tree, t);
             tagStack.push(top);
             super.visitStartElement(tree, ignore);
             // handle attributes that may or may not have been found in start element
             if (t != null) {
                 switch (t) {
                     case CAPTION:
                         if (parent != null && parent.tag == HtmlTag.TABLE)
                             parent.flags.add(Flag.TABLE_HAS_CAPTION);
                         break;
                     case IMG:
                         if (!top.attrs.contains(HtmlTag.Attr.ALT))
                             env.messages.error(ACCESSIBILITY, tree, "dc.no.alt.attr.for.image");
                         break;
                 }
             }
             return null;
         } finally {
             if (t == null || t.endKind == HtmlTag.EndKind.NONE)
                 tagStack.pop();
         }
     }
     private void checkStructure(StartElementTree tree, HtmlTag t) {
         Name treeName = tree.getName();
         TagStackItem top = tagStack.peek();
         switch (t.blockType) {
             case BLOCK:
                 if (top == null || top.tag.accepts(t))
                     return;
                 switch (top.tree.getKind()) {
                     case START_ELEMENT: {
                         if (top.tag.blockType == HtmlTag.BlockType.INLINE) {
                             Name name = ((StartElementTree) top.tree).getName();
                             env.messages.error(HTML, tree, "dc.tag.not.allowed.inline.element",
                                     treeName, name);
                             return;
                         }
                     }
                     break;
                     case LINK:
                     case LINK_PLAIN: {
                         String name = top.tree.getKind().tagName;
                         env.messages.error(HTML, tree, "dc.tag.not.allowed.inline.tag",
                                 treeName, name);
                         return;
                     }
                 }
                 break;
             case INLINE:
                 if (top == null || top.tag.accepts(t))
                     return;
                 break;
             case LIST_ITEM:
             case TABLE_ITEM:
                 if (top != null) {
                     // reset this flag so subsequent bad inline content gets reported
                     top.flags.remove(Flag.REPORTED_BAD_INLINE);
                     if (top.tag.accepts(t))
                         return;
                 }
                 break;
             case OTHER:
                 env.messages.error(HTML, tree, "dc.tag.not.allowed", treeName);
                 return;
         }
         env.messages.error(HTML, tree, "dc.tag.not.allowed.here", treeName);
     }
     private void checkHeader(StartElementTree tree, HtmlTag tag) {
         // verify the new tag
         if (getHeaderLevel(tag) > getHeaderLevel(currHeaderTag) + 1) {
             if (currHeaderTag == null) {
                 env.messages.error(ACCESSIBILITY, tree, "dc.tag.header.sequence.1", tag);
             } else {
                 env.messages.error(ACCESSIBILITY, tree, "dc.tag.header.sequence.2",
                     tag, currHeaderTag);
             }
         }
         currHeaderTag = tag;
     }
     private int getHeaderLevel(HtmlTag tag) {
         if (tag == null)
             return implicitHeaderLevel;
         switch (tag) {
             case H1: return 1;
             case H2: return 2;
             case H3: return 3;
             case H4: return 4;
             case H5: return 5;
             case H6: return 6;
             default: throw new IllegalArgumentException();
         }
     }
     @Override
     public Void visitEndElement(EndElementTree tree, Void ignore) {
         final Name treeName = tree.getName();
         final HtmlTag t = HtmlTag.get(treeName);
         if (t == null) {
             env.messages.error(HTML, tree, "dc.tag.unknown", treeName);
         } else if (t.endKind == HtmlTag.EndKind.NONE) {
             env.messages.error(HTML, tree, "dc.tag.end.not.permitted", treeName);
         } else {
             boolean done = false;
             while (!tagStack.isEmpty()) {
                 TagStackItem top = tagStack.peek();
                 if (t == top.tag) {
                     switch (t) {
                         case TABLE:
                             if (!top.attrs.contains(HtmlTag.Attr.SUMMARY)
                                     && !top.flags.contains(Flag.TABLE_HAS_CAPTION)) {
                                 env.messages.error(ACCESSIBILITY, tree,
                                         "dc.no.summary.or.caption.for.table");
                             }
                     }
                     if (t.flags.contains(HtmlTag.Flag.EXPECT_CONTENT)
                             && !top.flags.contains(Flag.HAS_TEXT)
                             && !top.flags.contains(Flag.HAS_ELEMENT)
                             && !top.flags.contains(Flag.HAS_INLINE_TAG)) {
                         env.messages.warning(HTML, tree, "dc.tag.empty", treeName);
                     }
                     tagStack.pop();
                     done = true;
                     break;
                 } else if (top.tag == null || top.tag.endKind != HtmlTag.EndKind.REQUIRED) {
                     tagStack.pop();
                 } else {
                     boolean found = false;
                     for (TagStackItem si: tagStack) {
                         if (si.tag == t) {
                             found = true;
                             break;
                         }
                     }
                     if (found && top.tree.getKind() == DocTree.Kind.START_ELEMENT) {
                         env.messages.error(HTML, top.tree, "dc.tag.start.unmatched",
                                 ((StartElementTree) top.tree).getName());
                         tagStack.pop();
                     } else {
                         env.messages.error(HTML, tree, "dc.tag.end.unexpected", treeName);
                         done = true;
                         break;
                     }
                 }
             }
             if (!done && tagStack.isEmpty()) {
                 env.messages.error(HTML, tree, "dc.tag.end.unexpected", treeName);
             }
         }
         return super.visitEndElement(tree, ignore);
     }
     // </editor-fold>
     // <editor-fold defaultstate="collapsed" desc="HTML attributes">
     @Override @SuppressWarnings("fallthrough")
     public Void visitAttribute(AttributeTree tree, Void ignore) {
         HtmlTag currTag = tagStack.peek().tag;
         if (currTag != null) {
             Name name = tree.getName();
             HtmlTag.Attr attr = currTag.getAttr(name);
             if (attr != null) {
                 boolean first = tagStack.peek().attrs.add(attr);
                 if (!first)
                     env.messages.error(HTML, tree, "dc.attr.repeated", name);
             }
             AttrKind k = currTag.getAttrKind(name);
             switch (k) {
                 case OK:
                     break;
                 case INVALID:
                     env.messages.error(HTML, tree, "dc.attr.unknown", name);
                     break;
                 case OBSOLETE:
                     env.messages.warning(ACCESSIBILITY, tree, "dc.attr.obsolete", name);
                     break;
                 case USE_CSS:
                     env.messages.warning(ACCESSIBILITY, tree, "dc.attr.obsolete.use.css", name);
                     break;
             }
             if (attr != null) {
                 switch (attr) {
                     case NAME:
                         if (currTag != HtmlTag.A) {
                             break;
                         }
                         // fallthrough
                     case ID:
                         String value = getAttrValue(tree);
                         if (value == null) {
                             env.messages.error(HTML, tree, "dc.anchor.value.missing");
                         } else {
                             if (!validName.matcher(value).matches()) {
                                 env.messages.error(HTML, tree, "dc.invalid.anchor", value);
                             }
                             if (!checkAnchor(value)) {
                                 env.messages.error(HTML, tree, "dc.anchor.already.defined", value);
                             }
                         }
                         break;
                     case HREF:
                         if (currTag == HtmlTag.A) {
                             String v = getAttrValue(tree);
                             if (v == null || v.isEmpty()) {
                                 env.messages.error(HTML, tree, "dc.attr.lacks.value");
                             } else {
                                 Matcher m = docRoot.matcher(v);
                                 if (m.matches()) {
                                     String rest = m.group(2);
                                     if (!rest.isEmpty())
                                         checkURI(tree, rest);
                                 } else {
                                     checkURI(tree, v);
                                 }
                             }
                         }
                         break;
                     case VALUE:
                         if (currTag == HtmlTag.LI) {
                             String v = getAttrValue(tree);
                             if (v == null || v.isEmpty()) {
                                 env.messages.error(HTML, tree, "dc.attr.lacks.value");
                             } else if (!validNumber.matcher(v).matches()) {
                                 env.messages.error(HTML, tree, "dc.attr.not.number");
                             }
                         }
                         break;
                 }
             }
         }
         // TODO: basic check on value
         return super.visitAttribute(tree, ignore);
     }
     private boolean checkAnchor(String name) {
         JavaFileObject fo = env.currPath.getCompilationUnit().getSourceFile();
         Set<String> set = foundAnchors.get(fo);
         if (set == null)
             foundAnchors.put(fo, set = new HashSet<>());
         return set.add(name);
     }
     // http://www.w3.org/TR/html401/types.html#type-name
     private static final Pattern validName = Pattern.compile("[A-Za-z][A-Za-z0-9-_:.]*");
     private static final Pattern validNumber = Pattern.compile("-?[0-9]+");
     // pattern to remove leading {@docRoot}/?
     private static final Pattern docRoot = Pattern.compile("(?i)(\\{@docRoot *\\}/?)?(.*)");
     private String getAttrValue(AttributeTree tree) {
         if (tree.getValue() == null)
             return null;
         StringWriter sw = new StringWriter();
         try {
             new DocPretty(sw).print(tree.getValue());
         } catch (IOException e) {
             // cannot happen
         }
         // ignore potential use of entities for now
         return sw.toString();
     }
     private void checkURI(AttributeTree tree, String uri) {
         try {
             URI u = new URI(uri);
         } catch (URISyntaxException e) {
             env.messages.error(HTML, tree, "dc.invalid.uri", uri);
         }
     }
     // </editor-fold>
     // <editor-fold defaultstate="collapsed" desc="javadoc tags">
     @Override
     public Void visitAuthor(AuthorTree tree, Void ignore) {
         warnIfEmpty(tree, tree.getName());
         return super.visitAuthor(tree, ignore);
     }
     @Override
     public Void visitDocRoot(DocRootTree tree, Void ignore) {
         markEnclosingTag(Flag.HAS_INLINE_TAG);
         return super.visitDocRoot(tree, ignore);
     }
     @Override
     public Void visitInheritDoc(InheritDocTree tree, Void ignore) {
         markEnclosingTag(Flag.HAS_INLINE_TAG);
         // TODO: verify on overridden method
         foundInheritDoc = true;
         return super.visitInheritDoc(tree, ignore);
     }
     @Override
     public Void visitLink(LinkTree tree, Void ignore) {
         markEnclosingTag(Flag.HAS_INLINE_TAG);
         // simulate inline context on tag stack
         HtmlTag t = (tree.getKind() == DocTree.Kind.LINK)
                 ? HtmlTag.CODE : HtmlTag.SPAN;
         tagStack.push(new TagStackItem(tree, t));
         try {
             return super.visitLink(tree, ignore);
         } finally {
             tagStack.pop();
         }
     }
     @Override
     public Void visitLiteral(LiteralTree tree, Void ignore) {
         markEnclosingTag(Flag.HAS_INLINE_TAG);
         if (tree.getKind() == DocTree.Kind.CODE) {
             for (TagStackItem tsi: tagStack) {
                 if (tsi.tag == HtmlTag.CODE) {
                     env.messages.warning(HTML, tree, "dc.tag.code.within.code");
                     break;
                 }
             }
         }
         return super.visitLiteral(tree, ignore);
     }
     @Override
     @SuppressWarnings("fallthrough")
     public Void visitParam(ParamTree tree, Void ignore) {
         boolean typaram = tree.isTypeParameter();
         IdentifierTree nameTree = tree.getName();
         Element paramElement = nameTree != null ? env.trees.getElement(new DocTreePath(getCurrentPath(), nameTree)) : null;
         if (paramElement == null) {
             switch (env.currElement.getKind()) {
                 case CLASS: case INTERFACE: {
                     if (!typaram) {
                         env.messages.error(REFERENCE, tree, "dc.invalid.param");
                         break;
                     }
                 }
                 case METHOD: case CONSTRUCTOR: {
                     env.messages.error(REFERENCE, nameTree, "dc.param.name.not.found");
                     break;
                 }
                 default:
                     env.messages.error(REFERENCE, tree, "dc.invalid.param");
                     break;
             }
         } else {
             foundParams.add(paramElement);
         }
         warnIfEmpty(tree, tree.getDescription());
         return super.visitParam(tree, ignore);
     }
     private void checkParamsDocumented(List<? extends Element> list) {
         if (foundInheritDoc)
             return;
         for (Element e: list) {
             if (!foundParams.contains(e)) {
                 CharSequence paramName = (e.getKind() == ElementKind.TYPE_PARAMETER)
                         ? "<" + e.getSimpleName() + ">"
                         : e.getSimpleName();
                 reportMissing("dc.missing.param", paramName);
             }
         }
     }
     @Override
     public Void visitReference(ReferenceTree tree, Void ignore) {
         Element e = env.trees.getElement(getCurrentPath());
         if (e == null)
             env.messages.error(REFERENCE, tree, "dc.ref.not.found");
         return super.visitReference(tree, ignore);
     }
     @Override
     public Void visitReturn(ReturnTree tree, Void ignore) {
         Element e = env.trees.getElement(env.currPath);
         if (e.getKind() != ElementKind.METHOD
                 || ((ExecutableElement) e).getReturnType().getKind() == TypeKind.VOID)
             env.messages.error(REFERENCE, tree, "dc.invalid.return");
         foundReturn = true;
         warnIfEmpty(tree, tree.getDescription());
         return super.visitReturn(tree, ignore);
     }
     @Override
     public Void visitSerialData(SerialDataTree tree, Void ignore) {
         warnIfEmpty(tree, tree.getDescription());
         return super.visitSerialData(tree, ignore);
     }
     @Override
     public Void visitSerialField(SerialFieldTree tree, Void ignore) {
         warnIfEmpty(tree, tree.getDescription());
         return super.visitSerialField(tree, ignore);
     }
     @Override
     public Void visitSince(SinceTree tree, Void ignore) {
         warnIfEmpty(tree, tree.getBody());
         return super.visitSince(tree, ignore);
     }
     @Override
     public Void visitThrows(ThrowsTree tree, Void ignore) {
         ReferenceTree exName = tree.getExceptionName();
         Element ex = env.trees.getElement(new DocTreePath(getCurrentPath(), exName));
         if (ex == null) {
             env.messages.error(REFERENCE, tree, "dc.ref.not.found");
         } else if (isThrowable(ex.asType())) {
             switch (env.currElement.getKind()) {
                 case CONSTRUCTOR:
                 case METHOD:
                     if (isCheckedException(ex.asType())) {
                         ExecutableElement ee = (ExecutableElement) env.currElement;
                         checkThrowsDeclared(exName, ex.asType(), ee.getThrownTypes());
                     }
                     break;
                 default:
                     env.messages.error(REFERENCE, tree, "dc.invalid.throws");
             }
         } else {
             env.messages.error(REFERENCE, tree, "dc.invalid.throws");
         }
         warnIfEmpty(tree, tree.getDescription());
         return scan(tree.getDescription(), ignore);
     }
     private boolean isThrowable(TypeMirror tm) {
         switch (tm.getKind()) {
             case DECLARED:
             case TYPEVAR:
                 return env.types.isAssignable(tm, env.java_lang_Throwable);
         }
         return false;
     }
     private void checkThrowsDeclared(ReferenceTree tree, TypeMirror t, List<? extends TypeMirror> list) {
         boolean found = false;
         for (TypeMirror tl : list) {
             if (env.types.isAssignable(t, tl)) {
                 foundThrows.add(tl);
                 found = true;
             }
         }
         if (!found)
             env.messages.error(REFERENCE, tree, "dc.exception.not.thrown", t);
     }
     private void checkThrowsDocumented(List<? extends TypeMirror> list) {
         if (foundInheritDoc)
             return;
         for (TypeMirror tl: list) {
             if (isCheckedException(tl) && !foundThrows.contains(tl))
                 reportMissing("dc.missing.throws", tl);
         }
     }
     @Override
     public Void visitValue(ValueTree tree, Void ignore) {
         markEnclosingTag(Flag.HAS_INLINE_TAG);
         return super.visitValue(tree, ignore);
     }
     @Override
     public Void visitVersion(VersionTree tree, Void ignore) {
         warnIfEmpty(tree, tree.getBody());
         return super.visitVersion(tree, ignore);
     }
     @Override
     public Void visitErroneous(ErroneousTree tree, Void ignore) {
         env.messages.error(SYNTAX, tree, null, tree.getDiagnostic().getMessage(null));
         return null;
     }
     // </editor-fold>
     // <editor-fold defaultstate="collapsed" desc="Utility methods">
     private boolean isCheckedException(TypeMirror t) {
         return !(env.types.isAssignable(t, env.java_lang_Error)
                 || env.types.isAssignable(t, env.java_lang_RuntimeException));
     }
     private boolean isSynthetic() {
         switch (env.currElement.getKind()) {
             case CONSTRUCTOR:
                 // A synthetic default constructor has the same pos as the
                 // enclosing class
                 TreePath p = env.currPath;
                 return env.getPos(p) == env.getPos(p.getParentPath());
         }
         return false;
     }
     void markEnclosingTag(Flag flag) {
         TagStackItem top = tagStack.peek();
         if (top != null)
             top.flags.add(flag);
     }
     String toString(TreePath p) {
         StringBuilder sb = new StringBuilder("TreePath[");
         toString(p, sb);
         sb.append("]");
         return sb.toString();
     }
     void toString(TreePath p, StringBuilder sb) {
         TreePath parent = p.getParentPath();
         if (parent != null) {
             toString(parent, sb);
             sb.append(",");
         }
        sb.append(p.getLeaf().getKind()).append(":").append(env.getPos(p)).append(":S").append(env.getStartPos(p));
     }
     void warnIfEmpty(DocTree tree, List<? extends DocTree> list) {
         for (DocTree d: list) {
             switch (d.getKind()) {
                 case TEXT:
                     if (hasNonWhitespace((TextTree) d))
                         return;
                     break;
                 default:
                     return;
             }
         }
         env.messages.warning(SYNTAX, tree, "dc.empty", tree.getKind().tagName);
     }
     boolean hasNonWhitespace(TextTree tree) {
         String s = tree.getBody();
         for (int i = 0; i < s.length(); i++) {
             if (!Character.isWhitespace(s.charAt(i)))
                 return true;
         }
         return false;
     }
     // </editor-fold>
 }

Mercurial > jdk8-mips64-public > langtools / annotate

src/share/classes/com/sun/tools/doclint/Checker.java@fdfbc5f0c4ed (annotated)

src/share/classes/com/sun/tools/doclint/Checker.java