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/*
* Copyright (c) 2012, 2017, 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 org.openjdk.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.element.VariableElement;
import javax.lang.model.type.TypeKind;
import javax.lang.model.type.TypeMirror;
import javax.tools.Diagnostic.Kind;
import javax.tools.JavaFileObject;
import org.openjdk.source.doctree.AttributeTree;
import org.openjdk.source.doctree.AuthorTree;
import org.openjdk.source.doctree.DocCommentTree;
import org.openjdk.source.doctree.DocRootTree;
import org.openjdk.source.doctree.DocTree;
import org.openjdk.source.doctree.EndElementTree;
import org.openjdk.source.doctree.EntityTree;
import org.openjdk.source.doctree.ErroneousTree;
import org.openjdk.source.doctree.IdentifierTree;
import org.openjdk.source.doctree.InheritDocTree;
import org.openjdk.source.doctree.LinkTree;
import org.openjdk.source.doctree.LiteralTree;
import org.openjdk.source.doctree.ParamTree;
import org.openjdk.source.doctree.ProvidesTree;
import org.openjdk.source.doctree.ReferenceTree;
import org.openjdk.source.doctree.ReturnTree;
import org.openjdk.source.doctree.SerialDataTree;
import org.openjdk.source.doctree.SerialFieldTree;
import org.openjdk.source.doctree.SinceTree;
import org.openjdk.source.doctree.StartElementTree;
import org.openjdk.source.doctree.TextTree;
import org.openjdk.source.doctree.ThrowsTree;
import org.openjdk.source.doctree.UnknownBlockTagTree;
import org.openjdk.source.doctree.UnknownInlineTagTree;
import org.openjdk.source.doctree.UsesTree;
import org.openjdk.source.doctree.ValueTree;
import org.openjdk.source.doctree.VersionTree;
import org.openjdk.source.tree.Tree;
import org.openjdk.source.util.DocTreePath;
import org.openjdk.source.util.DocTreePathScanner;
import org.openjdk.source.util.TreePath;
import org.openjdk.tools.doclint.HtmlTag.AttrKind;
import org.openjdk.tools.javac.tree.DocPretty;
import org.openjdk.tools.javac.util.Assert;
import org.openjdk.tools.javac.util.DefinedBy;
import org.openjdk.tools.javac.util.DefinedBy.Api;
import org.openjdk.tools.javac.util.StringUtils;
import static org.openjdk.tools.doclint.Messages.Group.*;
/**
* Validate a doc comment.
*
* 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.
*/
public class Checker extends DocTreePathScanner {
final Env env;
Set foundParams = new HashSet<>();
Set foundThrows = new HashSet<>();
Map> foundAnchors = new HashMap<>();
boolean foundInheritDoc = false;
boolean foundReturn = false;
public enum Flag {
TABLE_HAS_CAPTION,
HAS_ELEMENT,
HAS_HEADING,
HAS_INLINE_TAG,
HAS_TEXT,
REPORTED_BAD_INLINE
}
static class TagStackItem {
final DocTree tree; // typically, but not always, StartElementTree
final HtmlTag tag;
final Set attrs;
final Set 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 final Deque tagStack; // TODO: maybe want to record starting tree as well
private HtmlTag currHeaderTag;
private final int implicitHeaderLevel;
//
Checker(Env env) {
this.env = Assert.checkNonNull(env);
tagStack = new LinkedList<>();
implicitHeaderLevel = env.implicitHeaderLevel;
}
public Void scan(DocCommentTree tree, TreePath p) {
env.initTypes();
env.setCurrent(p, tree);
boolean isOverridingMethod = !env.currOverriddenMethods.isEmpty();
JavaFileObject fo = p.getCompilationUnit().getSourceFile();
if (p.getLeaf().getKind() == Tree.Kind.PACKAGE) {
// If p points to a package, 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.
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 && fo.isNameCompatible("package", JavaFileObject.Kind.HTML)) {
// a package.html file with a DocCommentTree
if (tree.getFullBody().isEmpty()) {
reportMissing("dc.missing.comment");
return null;
}
} 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 @DefinedBy(Api.COMPILER_TREE)
public Void visitDocComment(DocCommentTree tree, Void ignore) {
super.visitDocComment(tree, ignore);
for (TagStackItem tsi: tagStack) {
warnIfEmpty(tsi, null);
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;
}
//
//
@Override @DefinedBy(Api.COMPILER_TREE)
public Void visitText(TextTree tree, Void ignore) {
if (hasNonWhitespace(tree)) {
checkAllowsText(tree);
markEnclosingTag(Flag.HAS_TEXT);
}
return null;
}
@Override @DefinedBy(Api.COMPILER_TREE)
public Void visitEntity(EntityTree tree, Void ignore) {
checkAllowsText(tree);
markEnclosingTag(Flag.HAS_TEXT);
String name = tree.getName().toString();
if (name.startsWith("#")) {
int v = StringUtils.toLowerCase(name).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());
}
}
}
//
//
@Override @DefinedBy(Api.COMPILER_TREE)
public Void visitStartElement(StartElementTree 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.allowedVersion != HtmlVersion.ALL && t.allowedVersion != env.htmlVersion) {
env.messages.error(HTML, tree, "dc.tag.not.supported", treeName);
} else {
boolean done = false;
for (TagStackItem tsi: tagStack) {
if (tsi.tag.accepts(t)) {
while (tagStack.peek() != tsi) {
warnIfEmpty(tagStack.peek(), null);
tagStack.pop();
}
done = true;
break;
} else if (tsi.tag.endKind != HtmlTag.EndKind.OPTIONAL) {
done = true;
break;
}
}
if (!done && HtmlTag.BODY.accepts(t)) {
while (!tagStack.isEmpty()) {
warnIfEmpty(tagStack.peek(), null);
tagStack.pop();
}
}
markEnclosingTag(Flag.HAS_ELEMENT);
checkStructure(tree, t);
// tag specific checks
switch (t) {
// check for out of sequence headers, such as ...
...
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
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 H1: case H2: case H3: case H4: case H5: case H6:
if (parent != null && (parent.tag == HtmlTag.SECTION || parent.tag == HtmlTag.ARTICLE)) {
parent.flags.add(Flag.HAS_HEADING);
}
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:
switch (t) {
case SCRIPT:
//