jjg@1455: /*
jjg@1495:  * Copyright (c) 2012, 2013, Oracle and/or its affiliates. All rights reserved.
jjg@1455:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
jjg@1455:  *
jjg@1455:  * This code is free software; you can redistribute it and/or modify it
jjg@1455:  * under the terms of the GNU General Public License version 2 only, as
jjg@1455:  * published by the Free Software Foundation.  Oracle designates this
jjg@1455:  * particular file as subject to the "Classpath" exception as provided
jjg@1455:  * by Oracle in the LICENSE file that accompanied this code.
jjg@1455:  *
jjg@1455:  * This code is distributed in the hope that it will be useful, but WITHOUT
jjg@1455:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
jjg@1455:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
jjg@1455:  * version 2 for more details (a copy is included in the LICENSE file that
jjg@1455:  * accompanied this code).
jjg@1455:  *
jjg@1455:  * You should have received a copy of the GNU General Public License version
jjg@1455:  * 2 along with this work; if not, write to the Free Software Foundation,
jjg@1455:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
jjg@1455:  *
jjg@1455:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
jjg@1455:  * or visit www.oracle.com if you need additional information or have any
jjg@1455:  * questions.
jjg@1455:  */
jjg@1455: 
jjg@1455: package com.sun.tools.doclint;
jjg@1455: 
jjg@1499: import com.sun.source.doctree.LiteralTree;
jjg@1455: import java.util.regex.Matcher;
jjg@1455: import com.sun.source.doctree.LinkTree;
jjg@1455: import java.net.URI;
jjg@1455: import java.util.regex.Pattern;
jjg@1455: import java.io.IOException;
jjg@1455: import com.sun.tools.javac.tree.DocPretty;
jjg@1455: import java.io.StringWriter;
jjg@1455: import java.util.Deque;
jjg@1455: import java.util.EnumSet;
jjg@1455: import java.util.HashSet;
jjg@1455: import java.util.LinkedList;
jjg@1455: import java.util.List;
jjg@1455: import java.util.Set;
jjg@1455: 
jjg@1455: import javax.lang.model.element.Element;
jjg@1455: import javax.lang.model.element.ElementKind;
jjg@1455: import javax.lang.model.element.ExecutableElement;
jjg@1455: import javax.lang.model.element.Name;
jjg@1455: import javax.lang.model.element.TypeElement;
jjg@1455: import javax.lang.model.type.TypeKind;
jjg@1455: import javax.lang.model.type.TypeMirror;
jjg@1455: import javax.tools.Diagnostic.Kind;
jjg@1455: 
jjg@1455: import com.sun.source.doctree.AttributeTree;
jjg@1455: import com.sun.source.doctree.AuthorTree;
jjg@1455: import com.sun.source.doctree.DocCommentTree;
jjg@1455: import com.sun.source.doctree.DocTree;
jjg@1455: import com.sun.source.doctree.EndElementTree;
jjg@1455: import com.sun.source.doctree.EntityTree;
jjg@1455: import com.sun.source.doctree.ErroneousTree;
jjg@1455: import com.sun.source.doctree.IdentifierTree;
jjg@1455: import com.sun.source.doctree.InheritDocTree;
jjg@1455: import com.sun.source.doctree.ParamTree;
jjg@1455: import com.sun.source.doctree.ReferenceTree;
jjg@1455: import com.sun.source.doctree.ReturnTree;
jjg@1455: import com.sun.source.doctree.SerialDataTree;
jjg@1455: import com.sun.source.doctree.SerialFieldTree;
jjg@1455: import com.sun.source.doctree.SinceTree;
jjg@1455: import com.sun.source.doctree.StartElementTree;
jjg@1455: import com.sun.source.doctree.TextTree;
jjg@1455: import com.sun.source.doctree.ThrowsTree;
jjg@1455: import com.sun.source.doctree.VersionTree;
jjg@1455: import com.sun.source.util.DocTreeScanner;
jjg@1455: import com.sun.source.util.TreePath;
jjg@1455: import com.sun.tools.doclint.HtmlTag.AttrKind;
jjg@1455: import java.net.URISyntaxException;
jjg@1455: import static com.sun.tools.doclint.Messages.Group.*;
jjg@1455: 
jjg@1455: 
jjg@1455: /**
jjg@1455:  * Validate a doc comment.
jjg@1455:  *
jjg@1455:  * <p><b>This is NOT part of any supported API.
jjg@1455:  * If you write code that depends on this, you do so at your own
jjg@1455:  * risk.  This code and its internal interfaces are subject to change
jjg@1455:  * or deletion without notice.</b></p>
jjg@1455:  */
jjg@1455: public class Checker extends DocTreeScanner<Void, Void> {
jjg@1455:     final Env env;
jjg@1455: 
jjg@1455:     Set<Element> foundParams = new HashSet<Element>();
jjg@1455:     Set<TypeMirror> foundThrows = new HashSet<TypeMirror>();
jjg@1455:     Set<String> foundAnchors = new HashSet<String>();
jjg@1455:     boolean foundInheritDoc = false;
jjg@1455:     boolean foundReturn = false;
jjg@1455: 
jjg@1506:     public enum Flag {
jjg@1455:         TABLE_HAS_CAPTION,
jjg@1455:         HAS_ELEMENT,
jjg@1507:         HAS_TEXT,
jjg@1507:         REPORTED_BAD_INLINE
jjg@1455:     }
jjg@1455: 
jjg@1455:     static class TagStackItem {
jjg@1455:         final DocTree tree; // typically, but not always, StartElementTree
jjg@1455:         final HtmlTag tag;
jjg@1455:         final Set<HtmlTag.Attr> attrs;
jjg@1455:         final Set<Flag> flags;
jjg@1455:         TagStackItem(DocTree tree, HtmlTag tag) {
jjg@1455:             this.tree = tree;
jjg@1455:             this.tag = tag;
jjg@1455:             attrs = EnumSet.noneOf(HtmlTag.Attr.class);
jjg@1455:             flags = EnumSet.noneOf(Flag.class);
jjg@1455:         }
jjg@1455:         @Override
jjg@1455:         public String toString() {
jjg@1455:             return String.valueOf(tag);
jjg@1455:         }
jjg@1455:     }
jjg@1455: 
jjg@1455:     private Deque<TagStackItem> tagStack; // TODO: maybe want to record starting tree as well
jjg@1455:     private HtmlTag currHeaderTag;
jjg@1455: 
jjg@1455:     // <editor-fold defaultstate="collapsed" desc="Top level">
jjg@1455: 
jjg@1455:     Checker(Env env) {
jjg@1455:         env.getClass();
jjg@1455:         this.env = env;
jjg@1455:         tagStack = new LinkedList<TagStackItem>();
jjg@1455:     }
jjg@1455: 
jjg@1455:     public Void scan(DocCommentTree tree, TreePath p) {
jjg@1455:         env.setCurrent(p, tree);
jjg@1455: 
jjg@1455:         boolean isOverridingMethod = !env.currOverriddenMethods.isEmpty();
jjg@1455: 
jjg@1455:         if (tree == null) {
jjg@1455:             if (!isSynthetic() && !isOverridingMethod)
jjg@1455:                 reportMissing("dc.missing.comment");
jjg@1455:             return null;
jjg@1455:         }
jjg@1455: 
jjg@1455:         tagStack.clear();
jjg@1455:         currHeaderTag = null;
jjg@1455: 
jjg@1455:         foundParams.clear();
jjg@1455:         foundThrows.clear();
jjg@1455:         foundInheritDoc = false;
jjg@1455:         foundReturn = false;
jjg@1455: 
jjg@1455:         scan(tree, (Void) null);
jjg@1455: 
jjg@1455:         if (!isOverridingMethod) {
jjg@1455:             switch (env.currElement.getKind()) {
jjg@1455:                 case METHOD:
jjg@1455:                 case CONSTRUCTOR: {
jjg@1455:                     ExecutableElement ee = (ExecutableElement) env.currElement;
jjg@1455:                     checkParamsDocumented(ee.getTypeParameters());
jjg@1455:                     checkParamsDocumented(ee.getParameters());
jjg@1455:                     switch (ee.getReturnType().getKind()) {
jjg@1455:                         case VOID:
jjg@1455:                         case NONE:
jjg@1455:                             break;
jjg@1455:                         default:
jjg@1455:                             if (!foundReturn
jjg@1455:                                     && !foundInheritDoc
jjg@1455:                                     && !env.types.isSameType(ee.getReturnType(), env.java_lang_Void)) {
jjg@1455:                                 reportMissing("dc.missing.return");
jjg@1455:                             }
jjg@1455:                     }
jjg@1455:                     checkThrowsDocumented(ee.getThrownTypes());
jjg@1455:                 }
jjg@1455:             }
jjg@1455:         }
jjg@1455: 
jjg@1455:         return null;
jjg@1455:     }
jjg@1455: 
jjg@1455:     private void reportMissing(String code, Object... args) {
jjg@1455:         env.messages.report(MISSING, Kind.WARNING, env.currPath.getLeaf(), code, args);
jjg@1455:     }
jjg@1455: 
jjg@1455:     @Override
jjg@1455:     public Void visitDocComment(DocCommentTree tree, Void ignore) {
jjg@1455:         super.visitDocComment(tree, ignore);
jjg@1455:         for (TagStackItem tsi: tagStack) {
jjg@1455:             if (tsi.tree.getKind() == DocTree.Kind.START_ELEMENT
jjg@1455:                     && tsi.tag.endKind == HtmlTag.EndKind.REQUIRED) {
jjg@1455:                 StartElementTree t = (StartElementTree) tsi.tree;
jjg@1455:                 env.messages.error(HTML, t, "dc.tag.not.closed", t.getName());
jjg@1455:             }
jjg@1455:         }
jjg@1455:         return null;
jjg@1455:     }
jjg@1455:     // </editor-fold>
jjg@1455: 
jjg@1455:     // <editor-fold defaultstate="collapsed" desc="Text and entities.">
jjg@1455: 
jjg@1455:     @Override
jjg@1455:     public Void visitText(TextTree tree, Void ignore) {
jjg@1507:         if (hasNonWhitespace(tree)) {
jjg@1507:             checkAllowsText(tree);
jjg@1455:             markEnclosingTag(Flag.HAS_TEXT);
jjg@1455:         }
jjg@1455:         return null;
jjg@1455:     }
jjg@1455: 
jjg@1455:     @Override
jjg@1455:     public Void visitEntity(EntityTree tree, Void ignore) {
jjg@1507:         checkAllowsText(tree);
jjg@1455:         markEnclosingTag(Flag.HAS_TEXT);
jjg@1455:         String name = tree.getName().toString();
jjg@1455:         if (name.startsWith("#")) {
jjg@1455:             int v = name.toLowerCase().startsWith("#x")
jjg@1455:                     ? Integer.parseInt(name.substring(2), 16)
jjg@1455:                     : Integer.parseInt(name.substring(1), 10);
jjg@1455:             if (!Entity.isValid(v)) {
jjg@1455:                 env.messages.error(HTML, tree, "dc.entity.invalid", name);
jjg@1455:             }
jjg@1455:         } else if (!Entity.isValid(name)) {
jjg@1455:             env.messages.error(HTML, tree, "dc.entity.invalid", name);
jjg@1455:         }
jjg@1455:         return null;
jjg@1455:     }
jjg@1455: 
jjg@1507:     void checkAllowsText(DocTree tree) {
jjg@1507:         TagStackItem top = tagStack.peek();
jjg@1507:         if (top != null
jjg@1507:                 && top.tree.getKind() == DocTree.Kind.START_ELEMENT
jjg@1507:                 && !top.tag.acceptsText()) {
jjg@1507:             if (top.flags.add(Flag.REPORTED_BAD_INLINE)) {
jjg@1507:                 env.messages.error(HTML, tree, "dc.text.not.allowed",
jjg@1507:                         ((StartElementTree) top.tree).getName());
jjg@1507:             }
jjg@1507:         }
jjg@1507:     }
jjg@1507: 
jjg@1455:     // </editor-fold>
jjg@1455: 
jjg@1455:     // <editor-fold defaultstate="collapsed" desc="HTML elements">
jjg@1455: 
jjg@1455:     @Override
jjg@1455:     public Void visitStartElement(StartElementTree tree, Void ignore) {
jjg@1455:         markEnclosingTag(Flag.HAS_ELEMENT);
jjg@1455:         final Name treeName = tree.getName();
jjg@1455:         final HtmlTag t = HtmlTag.get(treeName);
jjg@1455:         if (t == null) {
jjg@1455:             env.messages.error(HTML, tree, "dc.tag.unknown", treeName);
jjg@1455:         } else {
jjg@1552:             boolean done = false;
jjg@1507:             for (TagStackItem tsi: tagStack) {
jjg@1507:                 if (tsi.tag.accepts(t)) {
jjg@1507:                     while (tagStack.peek() != tsi) tagStack.pop();
jjg@1552:                     done = true;
jjg@1507:                     break;
jjg@1552:                 } else if (tsi.tag.endKind != HtmlTag.EndKind.OPTIONAL) {
jjg@1552:                     done = true;
jjg@1507:                     break;
jjg@1552:                 }
jjg@1552:             }
jjg@1552:             if (!done && HtmlTag.BODY.accepts(t)) {
jjg@1552:                 tagStack.clear();
jjg@1507:             }
jjg@1507: 
jjg@1507:             checkStructure(tree, t);
jjg@1507: 
jjg@1455:             // tag specific checks
jjg@1455:             switch (t) {
jjg@1455:                 // check for out of sequence headers, such as <h1>...</h1>  <h3>...</h3>
jjg@1455:                 case H1: case H2: case H3: case H4: case H5: case H6:
jjg@1455:                     checkHeader(tree, t);
jjg@1455:                     break;
jjg@1455:             }
jjg@1455: 
jjg@1455:             if (t.flags.contains(HtmlTag.Flag.NO_NEST)) {
jjg@1455:                 for (TagStackItem i: tagStack) {
jjg@1455:                     if (t == i.tag) {
jjg@1455:                         env.messages.warning(HTML, tree, "dc.tag.nested.not.allowed", treeName);
jjg@1455:                         break;
jjg@1455:                     }
jjg@1455:                 }
jjg@1455:             }
jjg@1455:         }
jjg@1455: 
jjg@1455:         // check for self closing tags, such as <a id="name"/>
jjg@1455:         if (tree.isSelfClosing()) {
jjg@1455:             env.messages.error(HTML, tree, "dc.tag.self.closing", treeName);
jjg@1455:         }
jjg@1455: 
jjg@1455:         try {
jjg@1455:             TagStackItem parent = tagStack.peek();
jjg@1455:             TagStackItem top = new TagStackItem(tree, t);
jjg@1455:             tagStack.push(top);
jjg@1455: 
jjg@1455:             super.visitStartElement(tree, ignore);
jjg@1455: 
jjg@1455:             // handle attributes that may or may not have been found in start element
jjg@1455:             if (t != null) {
jjg@1455:                 switch (t) {
jjg@1455:                     case CAPTION:
jjg@1455:                         if (parent != null && parent.tag == HtmlTag.TABLE)
jjg@1455:                             parent.flags.add(Flag.TABLE_HAS_CAPTION);
jjg@1455:                         break;
jjg@1455: 
jjg@1455:                     case IMG:
jjg@1455:                         if (!top.attrs.contains(HtmlTag.Attr.ALT))
jjg@1455:                             env.messages.error(ACCESSIBILITY, tree, "dc.no.alt.attr.for.image");
jjg@1455:                         break;
jjg@1455:                 }
jjg@1455:             }
jjg@1455: 
jjg@1455:             return null;
jjg@1455:         } finally {
jjg@1455: 
jjg@1455:             if (t == null || t.endKind == HtmlTag.EndKind.NONE)
jjg@1455:                 tagStack.pop();
jjg@1455:         }
jjg@1455:     }
jjg@1455: 
jjg@1507:     private void checkStructure(StartElementTree tree, HtmlTag t) {
jjg@1507:         Name treeName = tree.getName();
jjg@1507:         TagStackItem top = tagStack.peek();
jjg@1507:         switch (t.blockType) {
jjg@1507:             case BLOCK:
jjg@1507:                 if (top == null || top.tag.accepts(t))
jjg@1507:                     return;
jjg@1507: 
jjg@1507:                 switch (top.tree.getKind()) {
jjg@1507:                     case START_ELEMENT: {
jjg@1507:                         if (top.tag.blockType == HtmlTag.BlockType.INLINE) {
jjg@1507:                             Name name = ((StartElementTree) top.tree).getName();
jjg@1507:                             env.messages.error(HTML, tree, "dc.tag.not.allowed.inline.element",
jjg@1507:                                     treeName, name);
jjg@1507:                             return;
jjg@1507:                         }
jjg@1507:                     }
jjg@1507:                     break;
jjg@1507: 
jjg@1507:                     case LINK:
jjg@1507:                     case LINK_PLAIN: {
jjg@1507:                         String name = top.tree.getKind().tagName;
jjg@1507:                         env.messages.error(HTML, tree, "dc.tag.not.allowed.inline.tag",
jjg@1507:                                 treeName, name);
jjg@1507:                         return;
jjg@1507:                     }
jjg@1507:                 }
jjg@1507:                 break;
jjg@1507: 
jjg@1507:             case INLINE:
jjg@1507:                 if (top == null || top.tag.accepts(t))
jjg@1507:                     return;
jjg@1507:                 break;
jjg@1507: 
jjg@1507:             case LIST_ITEM:
jjg@1507:             case TABLE_ITEM:
jjg@1507:                 if (top != null) {
jjg@1507:                     // reset this flag so subsequent bad inline content gets reported
jjg@1507:                     top.flags.remove(Flag.REPORTED_BAD_INLINE);
jjg@1507:                     if (top.tag.accepts(t))
jjg@1507:                         return;
jjg@1507:                 }
jjg@1507:                 break;
jjg@1507: 
jjg@1507:             case OTHER:
jjg@1507:                 env.messages.error(HTML, tree, "dc.tag.not.allowed", treeName);
jjg@1507:                 return;
jjg@1507:         }
jjg@1507: 
jjg@1507:         env.messages.error(HTML, tree, "dc.tag.not.allowed.here", treeName);
jjg@1507:     }
jjg@1507: 
jjg@1455:     private void checkHeader(StartElementTree tree, HtmlTag tag) {
jjg@1455:         // verify the new tag
jjg@1455:         if (getHeaderLevel(tag) > getHeaderLevel(currHeaderTag) + 1) {
jjg@1455:             if (currHeaderTag == null) {
jjg@1455:                 env.messages.error(ACCESSIBILITY, tree, "dc.tag.header.sequence.1", tag);
jjg@1455:             } else {
jjg@1455:                 env.messages.error(ACCESSIBILITY, tree, "dc.tag.header.sequence.2",
jjg@1455:                     tag, currHeaderTag);
jjg@1455:             }
jjg@1455:         }
jjg@1455: 
jjg@1455:         currHeaderTag = tag;
jjg@1455:     }
jjg@1455: 
jjg@1455:     private int getHeaderLevel(HtmlTag tag) {
jjg@1455:         if (tag == null)
jjg@1455:             return 0;
jjg@1455:         switch (tag) {
jjg@1455:             case H1: return 1;
jjg@1455:             case H2: return 2;
jjg@1455:             case H3: return 3;
jjg@1455:             case H4: return 4;
jjg@1455:             case H5: return 5;
jjg@1455:             case H6: return 6;
jjg@1455:             default: throw new IllegalArgumentException();
jjg@1455:         }
jjg@1455:     }
jjg@1455: 
jjg@1455:     @Override
jjg@1455:     public Void visitEndElement(EndElementTree tree, Void ignore) {
jjg@1455:         final Name treeName = tree.getName();
jjg@1455:         final HtmlTag t = HtmlTag.get(treeName);
jjg@1455:         if (t == null) {
jjg@1455:             env.messages.error(HTML, tree, "dc.tag.unknown", treeName);
jjg@1455:         } else if (t.endKind == HtmlTag.EndKind.NONE) {
jjg@1455:             env.messages.error(HTML, tree, "dc.tag.end.not.permitted", treeName);
jjg@1455:         } else {
jjg@1499:             boolean done = false;
jjg@1455:             while (!tagStack.isEmpty()) {
jjg@1455:                 TagStackItem top = tagStack.peek();
jjg@1455:                 if (t == top.tag) {
jjg@1455:                     switch (t) {
jjg@1455:                         case TABLE:
jjg@1455:                             if (!top.attrs.contains(HtmlTag.Attr.SUMMARY)
jjg@1455:                                     && !top.flags.contains(Flag.TABLE_HAS_CAPTION)) {
jjg@1455:                                 env.messages.error(ACCESSIBILITY, tree,
jjg@1455:                                         "dc.no.summary.or.caption.for.table");
jjg@1455:                             }
jjg@1455:                     }
jjg@1455:                     if (t.flags.contains(HtmlTag.Flag.EXPECT_CONTENT)
jjg@1455:                             && !top.flags.contains(Flag.HAS_TEXT)
jjg@1455:                             && !top.flags.contains(Flag.HAS_ELEMENT)) {
jjg@1455:                         env.messages.warning(HTML, tree, "dc.tag.empty", treeName);
jjg@1455:                     }
jjg@1455:                     tagStack.pop();
jjg@1499:                     done = true;
jjg@1455:                     break;
jjg@1455:                 } else if (top.tag == null || top.tag.endKind != HtmlTag.EndKind.REQUIRED) {
jjg@1455:                     tagStack.pop();
jjg@1455:                 } else {
jjg@1455:                     boolean found = false;
jjg@1455:                     for (TagStackItem si: tagStack) {
jjg@1455:                         if (si.tag == t) {
jjg@1455:                             found = true;
jjg@1455:                             break;
jjg@1455:                         }
jjg@1455:                     }
jjg@1455:                     if (found && top.tree.getKind() == DocTree.Kind.START_ELEMENT) {
jjg@1455:                         env.messages.error(HTML, top.tree, "dc.tag.start.unmatched",
jjg@1455:                                 ((StartElementTree) top.tree).getName());
jjg@1455:                         tagStack.pop();
jjg@1455:                     } else {
jjg@1455:                         env.messages.error(HTML, tree, "dc.tag.end.unexpected", treeName);
jjg@1499:                         done = true;
jjg@1455:                         break;
jjg@1455:                     }
jjg@1455:                 }
jjg@1455:             }
jjg@1499: 
jjg@1499:             if (!done && tagStack.isEmpty()) {
jjg@1499:                 env.messages.error(HTML, tree, "dc.tag.end.unexpected", treeName);
jjg@1499:             }
jjg@1455:         }
jjg@1455: 
jjg@1455:         return super.visitEndElement(tree, ignore);
jjg@1455:     }
jjg@1455:     // </editor-fold>
jjg@1455: 
jjg@1455:     // <editor-fold defaultstate="collapsed" desc="HTML attributes">
jjg@1455: 
jjg@1455:     @Override @SuppressWarnings("fallthrough")
jjg@1455:     public Void visitAttribute(AttributeTree tree, Void ignore) {
jjg@1455:         HtmlTag currTag = tagStack.peek().tag;
jjg@1455:         if (currTag != null) {
jjg@1455:             Name name = tree.getName();
jjg@1455:             HtmlTag.Attr attr = currTag.getAttr(name);
jjg@1455:             if (attr != null) {
jjg@1455:                 boolean first = tagStack.peek().attrs.add(attr);
jjg@1455:                 if (!first)
jjg@1455:                     env.messages.error(HTML, tree, "dc.attr.repeated", name);
jjg@1455:             }
jjg@1455:             AttrKind k = currTag.getAttrKind(name);
jjg@1455:             switch (k) {
jjg@1455:                 case OK:
jjg@1455:                     break;
jjg@1455: 
jjg@1455:                 case INVALID:
jjg@1455:                     env.messages.error(HTML, tree, "dc.attr.unknown", name);
jjg@1455:                     break;
jjg@1455: 
jjg@1455:                 case OBSOLETE:
jjg@1455:                     env.messages.warning(ACCESSIBILITY, tree, "dc.attr.obsolete", name);
jjg@1455:                     break;
jjg@1455: 
jjg@1455:                 case USE_CSS:
jjg@1455:                     env.messages.warning(ACCESSIBILITY, tree, "dc.attr.obsolete.use.css", name);
jjg@1455:                     break;
jjg@1455:             }
jjg@1455: 
jjg@1455:             if (attr != null) {
jjg@1455:                 switch (attr) {
jjg@1455:                     case NAME:
jjg@1455:                         if (currTag != HtmlTag.A) {
jjg@1455:                             break;
jjg@1455:                         }
jjg@1495:                         // fallthrough
jjg@1455:                     case ID:
jjg@1455:                         String value = getAttrValue(tree);
jjg@1495:                         if (value == null) {
jjg@1495:                             env.messages.error(HTML, tree, "dc.anchor.value.missing");
jjg@1495:                         } else {
jjg@1495:                             if (!validName.matcher(value).matches()) {
jjg@1495:                                 env.messages.error(HTML, tree, "dc.invalid.anchor", value);
jjg@1495:                             }
jjg@1495:                             if (!foundAnchors.add(value)) {
jjg@1495:                                 env.messages.error(HTML, tree, "dc.anchor.already.defined", value);
jjg@1495:                             }
jjg@1455:                         }
jjg@1455:                         break;
jjg@1455: 
jjg@1455:                     case HREF:
jjg@1455:                         if (currTag == HtmlTag.A) {
jjg@1455:                             String v = getAttrValue(tree);
jjg@1455:                             if (v == null || v.isEmpty()) {
jjg@1455:                                 env.messages.error(HTML, tree, "dc.attr.lacks.value");
jjg@1455:                             } else {
jjg@1455:                                 Matcher m = docRoot.matcher(v);
jjg@1455:                                 if (m.matches()) {
jjg@1455:                                     String rest = m.group(2);
jjg@1455:                                     if (!rest.isEmpty())
jjg@1455:                                         checkURI(tree, rest);
jjg@1455:                                 } else {
jjg@1455:                                     checkURI(tree, v);
jjg@1455:                                 }
jjg@1455:                             }
jjg@1455:                         }
jjg@1455:                         break;
jjg@1455:                 }
jjg@1455:             }
jjg@1455:         }
jjg@1455: 
jjg@1455:         // TODO: basic check on value
jjg@1455: 
jjg@1455:         return super.visitAttribute(tree, ignore);
jjg@1455:     }
jjg@1455: 
jjg@1455:     // http://www.w3.org/TR/html401/types.html#type-name
jjg@1455:     private static final Pattern validName = Pattern.compile("[A-Za-z][A-Za-z0-9-_:.]*");
jjg@1455: 
jjg@1455:     // pattern to remove leading {@docRoot}/?
jjg@1455:     private static final Pattern docRoot = Pattern.compile("(?i)(\\{@docRoot *\\}/?)?(.*)");
jjg@1455: 
jjg@1455:     private String getAttrValue(AttributeTree tree) {
jjg@1455:         if (tree.getValue() == null)
jjg@1455:             return null;
jjg@1455: 
jjg@1455:         StringWriter sw = new StringWriter();
jjg@1455:         try {
jjg@1455:             new DocPretty(sw).print(tree.getValue());
jjg@1455:         } catch (IOException e) {
jjg@1455:             // cannot happen
jjg@1455:         }
jjg@1455:         // ignore potential use of entities for now
jjg@1455:         return sw.toString();
jjg@1455:     }
jjg@1455: 
jjg@1455:     private void checkURI(AttributeTree tree, String uri) {
jjg@1455:         try {
jjg@1455:             URI u = new URI(uri);
jjg@1455:         } catch (URISyntaxException e) {
jjg@1455:             env.messages.error(HTML, tree, "dc.invalid.uri", uri);
jjg@1455:         }
jjg@1455:     }
jjg@1455:     // </editor-fold>
jjg@1455: 
jjg@1455:     // <editor-fold defaultstate="collapsed" desc="javadoc tags">
jjg@1455: 
jjg@1455:     @Override
jjg@1455:     public Void visitAuthor(AuthorTree tree, Void ignore) {
jjg@1455:         warnIfEmpty(tree, tree.getName());
jjg@1455:         return super.visitAuthor(tree, ignore);
jjg@1455:     }
jjg@1455: 
jjg@1455:     @Override
jjg@1455:     public Void visitInheritDoc(InheritDocTree tree, Void ignore) {
jjg@1455:         // TODO: verify on overridden method
jjg@1455:         foundInheritDoc = true;
jjg@1455:         return super.visitInheritDoc(tree, ignore);
jjg@1455:     }
jjg@1455: 
jjg@1455:     @Override
jjg@1455:     public Void visitLink(LinkTree tree, Void ignore) {
jjg@1455:         // simulate inline context on tag stack
jjg@1455:         HtmlTag t = (tree.getKind() == DocTree.Kind.LINK)
jjg@1455:                 ? HtmlTag.CODE : HtmlTag.SPAN;
jjg@1455:         tagStack.push(new TagStackItem(tree, t));
jjg@1455:         try {
jjg@1455:             return super.visitLink(tree, ignore);
jjg@1455:         } finally {
jjg@1455:             tagStack.pop();
jjg@1455:         }
jjg@1455:     }
jjg@1455: 
jjg@1455:     @Override
jjg@1499:     public Void visitLiteral(LiteralTree tree, Void ignore) {
jjg@1499:         if (tree.getKind() == DocTree.Kind.CODE) {
jjg@1499:             for (TagStackItem tsi: tagStack) {
jjg@1499:                 if (tsi.tag == HtmlTag.CODE) {
jjg@1502:                     env.messages.warning(HTML, tree, "dc.tag.code.within.code");
jjg@1499:                     break;
jjg@1499:                 }
jjg@1499:             }
jjg@1499:         }
jjg@1499:         return super.visitLiteral(tree, ignore);
jjg@1499:     }
jjg@1499: 
jjg@1499:     @Override
jjg@1455:     public Void visitParam(ParamTree tree, Void ignore) {
jjg@1455:         boolean typaram = tree.isTypeParameter();
jjg@1455:         IdentifierTree nameTree = tree.getName();
jjg@1455:         Element e = env.currElement;
jjg@1455:         switch (e.getKind()) {
jjg@1455:             case METHOD: case CONSTRUCTOR: {
jjg@1455:                 ExecutableElement ee = (ExecutableElement) e;
jjg@1455:                 checkParamDeclared(nameTree, typaram ? ee.getTypeParameters() : ee.getParameters());
jjg@1455:                 break;
jjg@1455:             }
jjg@1455: 
jjg@1455:             case CLASS: case INTERFACE: {
jjg@1455:                 TypeElement te = (TypeElement) e;
jjg@1455:                 if (typaram) {
jjg@1455:                     checkParamDeclared(nameTree, te.getTypeParameters());
jjg@1455:                 } else {
jjg@1455:                     env.messages.error(REFERENCE, tree, "dc.invalid.param");
jjg@1455:                 }
jjg@1455:                 break;
jjg@1455:             }
jjg@1455: 
jjg@1455:             default:
jjg@1455:                 env.messages.error(REFERENCE, tree, "dc.invalid.param");
jjg@1455:                 break;
jjg@1455:         }
jjg@1455:         warnIfEmpty(tree, tree.getDescription());
jjg@1455:         return super.visitParam(tree, ignore);
jjg@1455:     }
jjg@1455:     // where
jjg@1455:     private void checkParamDeclared(IdentifierTree nameTree, List<? extends Element> list) {
jjg@1455:         Name name = nameTree.getName();
jjg@1455:         boolean found = false;
jjg@1455:         for (Element e: list) {
jjg@1455:             if (name.equals(e.getSimpleName())) {
jjg@1455:                 foundParams.add(e);
jjg@1455:                 found = true;
jjg@1455:             }
jjg@1455:         }
jjg@1455:         if (!found)
jjg@1455:             env.messages.error(REFERENCE, nameTree, "dc.param.name.not.found");
jjg@1455:     }
jjg@1455: 
jjg@1455:     private void checkParamsDocumented(List<? extends Element> list) {
jjg@1455:         if (foundInheritDoc)
jjg@1455:             return;
jjg@1455: 
jjg@1455:         for (Element e: list) {
jjg@1455:             if (!foundParams.contains(e)) {
jjg@1455:                 CharSequence paramName = (e.getKind() == ElementKind.TYPE_PARAMETER)
jjg@1455:                         ? "<" + e.getSimpleName() + ">"
jjg@1455:                         : e.getSimpleName();
jjg@1455:                 reportMissing("dc.missing.param", paramName);
jjg@1455:             }
jjg@1455:         }
jjg@1455:     }
jjg@1455: 
jjg@1455:     @Override
jjg@1455:     public Void visitReference(ReferenceTree tree, Void ignore) {
jjg@1455:         Element e = env.trees.getElement(env.currPath, tree);
jjg@1455:         if (e == null)
jjg@1455:             env.messages.error(REFERENCE, tree, "dc.ref.not.found");
jjg@1455:         return super.visitReference(tree, ignore);
jjg@1455:     }
jjg@1455: 
jjg@1455:     @Override
jjg@1455:     public Void visitReturn(ReturnTree tree, Void ignore) {
jjg@1455:         Element e = env.trees.getElement(env.currPath);
jjg@1455:         if (e.getKind() != ElementKind.METHOD
jjg@1455:                 || ((ExecutableElement) e).getReturnType().getKind() == TypeKind.VOID)
jjg@1455:             env.messages.error(REFERENCE, tree, "dc.invalid.return");
jjg@1455:         foundReturn = true;
jjg@1455:         warnIfEmpty(tree, tree.getDescription());
jjg@1455:         return super.visitReturn(tree, ignore);
jjg@1455:     }
jjg@1455: 
jjg@1455:     @Override
jjg@1455:     public Void visitSerialData(SerialDataTree tree, Void ignore) {
jjg@1455:         warnIfEmpty(tree, tree.getDescription());
jjg@1455:         return super.visitSerialData(tree, ignore);
jjg@1455:     }
jjg@1455: 
jjg@1455:     @Override
jjg@1455:     public Void visitSerialField(SerialFieldTree tree, Void ignore) {
jjg@1455:         warnIfEmpty(tree, tree.getDescription());
jjg@1455:         return super.visitSerialField(tree, ignore);
jjg@1455:     }
jjg@1455: 
jjg@1455:     @Override
jjg@1455:     public Void visitSince(SinceTree tree, Void ignore) {
jjg@1455:         warnIfEmpty(tree, tree.getBody());
jjg@1455:         return super.visitSince(tree, ignore);
jjg@1455:     }
jjg@1455: 
jjg@1455:     @Override
jjg@1455:     public Void visitThrows(ThrowsTree tree, Void ignore) {
jjg@1455:         ReferenceTree exName = tree.getExceptionName();
jjg@1455:         Element ex = env.trees.getElement(env.currPath, exName);
jjg@1455:         if (ex == null) {
jjg@1455:             env.messages.error(REFERENCE, tree, "dc.ref.not.found");
jjg@1455:         } else if (ex.asType().getKind() == TypeKind.DECLARED
jjg@1455:                 && env.types.isAssignable(ex.asType(), env.java_lang_Throwable)) {
jjg@1455:             switch (env.currElement.getKind()) {
jjg@1455:                 case CONSTRUCTOR:
jjg@1455:                 case METHOD:
jjg@1455:                     if (isCheckedException(ex.asType())) {
jjg@1455:                         ExecutableElement ee = (ExecutableElement) env.currElement;
jjg@1455:                         checkThrowsDeclared(exName, ex.asType(), ee.getThrownTypes());
jjg@1455:                     }
jjg@1455:                     break;
jjg@1455:                 default:
jjg@1455:                     env.messages.error(REFERENCE, tree, "dc.invalid.throws");
jjg@1455:             }
jjg@1455:         } else {
jjg@1455:             env.messages.error(REFERENCE, tree, "dc.invalid.throws");
jjg@1455:         }
jjg@1455:         warnIfEmpty(tree, tree.getDescription());
jjg@1455:         return scan(tree.getDescription(), ignore);
jjg@1455:     }
jjg@1455: 
jjg@1455:     private void checkThrowsDeclared(ReferenceTree tree, TypeMirror t, List<? extends TypeMirror> list) {
jjg@1455:         boolean found = false;
jjg@1455:         for (TypeMirror tl : list) {
jjg@1455:             if (env.types.isAssignable(t, tl)) {
jjg@1455:                 foundThrows.add(tl);
jjg@1455:                 found = true;
jjg@1455:             }
jjg@1455:         }
jjg@1455:         if (!found)
jjg@1455:             env.messages.error(REFERENCE, tree, "dc.exception.not.thrown", t);
jjg@1455:     }
jjg@1455: 
jjg@1455:     private void checkThrowsDocumented(List<? extends TypeMirror> list) {
jjg@1455:         if (foundInheritDoc)
jjg@1455:             return;
jjg@1455: 
jjg@1455:         for (TypeMirror tl: list) {
jjg@1455:             if (isCheckedException(tl) && !foundThrows.contains(tl))
jjg@1455:                 reportMissing("dc.missing.throws", tl);
jjg@1455:         }
jjg@1455:     }
jjg@1455: 
jjg@1455:     @Override
jjg@1455:     public Void visitVersion(VersionTree tree, Void ignore) {
jjg@1455:         warnIfEmpty(tree, tree.getBody());
jjg@1455:         return super.visitVersion(tree, ignore);
jjg@1455:     }
jjg@1455: 
jjg@1455:     @Override
jjg@1455:     public Void visitErroneous(ErroneousTree tree, Void ignore) {
jjg@1455:         env.messages.error(SYNTAX, tree, null, tree.getDiagnostic().getMessage(null));
jjg@1455:         return null;
jjg@1455:     }
jjg@1455:     // </editor-fold>
jjg@1455: 
jjg@1455:     // <editor-fold defaultstate="collapsed" desc="Utility methods">
jjg@1455: 
jjg@1455:     private boolean isCheckedException(TypeMirror t) {
jjg@1455:         return !(env.types.isAssignable(t, env.java_lang_Error)
jjg@1455:                 || env.types.isAssignable(t, env.java_lang_RuntimeException));
jjg@1455:     }
jjg@1455: 
jjg@1455:     private boolean isSynthetic() {
jjg@1455:         switch (env.currElement.getKind()) {
jjg@1455:             case CONSTRUCTOR:
jjg@1455:                 // A synthetic default constructor has the same pos as the
jjg@1455:                 // enclosing class
jjg@1455:                 TreePath p = env.currPath;
jjg@1455:                 return env.getPos(p) == env.getPos(p.getParentPath());
jjg@1455:         }
jjg@1455:         return false;
jjg@1455:     }
jjg@1455: 
jjg@1455:     void markEnclosingTag(Flag flag) {
jjg@1455:         TagStackItem top = tagStack.peek();
jjg@1455:         if (top != null)
jjg@1455:             top.flags.add(flag);
jjg@1455:     }
jjg@1455: 
jjg@1455:     String toString(TreePath p) {
jjg@1455:         StringBuilder sb = new StringBuilder("TreePath[");
jjg@1455:         toString(p, sb);
jjg@1455:         sb.append("]");
jjg@1455:         return sb.toString();
jjg@1455:     }
jjg@1455: 
jjg@1455:     void toString(TreePath p, StringBuilder sb) {
jjg@1455:         TreePath parent = p.getParentPath();
jjg@1455:         if (parent != null) {
jjg@1455:             toString(parent, sb);
jjg@1455:             sb.append(",");
jjg@1455:         }
jjg@1455:        sb.append(p.getLeaf().getKind()).append(":").append(env.getPos(p)).append(":S").append(env.getStartPos(p));
jjg@1455:     }
jjg@1455: 
jjg@1455:     void warnIfEmpty(DocTree tree, List<? extends DocTree> list) {
jjg@1455:         for (DocTree d: list) {
jjg@1455:             switch (d.getKind()) {
jjg@1455:                 case TEXT:
jjg@1507:                     if (hasNonWhitespace((TextTree) d))
jjg@1455:                         return;
jjg@1455:                     break;
jjg@1455:                 default:
jjg@1455:                     return;
jjg@1455:             }
jjg@1455:         }
jjg@1455:         env.messages.warning(SYNTAX, tree, "dc.empty", tree.getKind().tagName);
jjg@1455:     }
jjg@1507: 
jjg@1507:     boolean hasNonWhitespace(TextTree tree) {
jjg@1507:         String s = tree.getBody();
jjg@1507:         for (int i = 0; i < s.length(); i++) {
jjg@1507:             if (!Character.isWhitespace(s.charAt(i)))
jjg@1507:                 return true;
jjg@1507:         }
jjg@1507:         return false;
jjg@1507:     }
jjg@1507: 
jjg@1455:     // </editor-fold>
jjg@1455: 
jjg@1455: }