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The Checker.java Java example source code
/*
* 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.element.VariableElement;
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.UnknownBlockTagTree;
import com.sun.source.doctree.UnknownInlineTagTree;
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>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>
*/
public class Checker extends DocTreePathScanner<Void, Void> {
final Env env;
Set<Element> foundParams = new HashSet<>();
Set<TypeMirror> foundThrows = new HashSet<>();
Map<Element, Set 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) {
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;
}
// </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) {
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) {
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 <h1>... ...
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");
}
}
warnIfEmpty(top, tree);
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);
}
void warnIfEmpty(TagStackItem tsi, DocTree endTree) {
if (tsi.tag != null && tsi.tree instanceof StartElementTree) {
if (tsi.tag.flags.contains(HtmlTag.Flag.EXPECT_CONTENT)
&& !tsi.flags.contains(Flag.HAS_TEXT)
&& !tsi.flags.contains(Flag.HAS_ELEMENT)
&& !tsi.flags.contains(Flag.HAS_INLINE_TAG)) {
DocTree tree = (endTree != null) ? endTree : tsi.tree;
Name treeName = ((StartElementTree) tsi.tree).getName();
env.messages.warning(HTML, tree, "dc.tag.empty", treeName);
}
}
}
// </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) {
Element e = getEnclosingPackageOrClass(env.currElement);
if (e == null)
return true;
Set<String> set = foundAnchors.get(e);
if (set == null)
foundAnchors.put(e, set = new HashSet<>());
return set.add(name);
}
private Element getEnclosingPackageOrClass(Element e) {
while (e != null) {
switch (e.getKind()) {
case CLASS:
case ENUM:
case INTERFACE:
case PACKAGE:
return e;
default:
e = e.getEnclosingElement();
}
}
return e;
}
// 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) {
String sig = tree.getSignature();
if (sig.contains("<") || sig.contains(">"))
env.messages.error(REFERENCE, tree, "dc.type.arg.not.allowed");
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 visitUnknownBlockTag(UnknownBlockTagTree tree, Void ignore) {
checkUnknownTag(tree, tree.getTagName());
return super.visitUnknownBlockTag(tree, ignore);
}
@Override
public Void visitUnknownInlineTag(UnknownInlineTagTree tree, Void ignore) {
checkUnknownTag(tree, tree.getTagName());
return super.visitUnknownInlineTag(tree, ignore);
}
private void checkUnknownTag(DocTree tree, String tagName) {
if (env.customTags != null && !env.customTags.contains(tagName))
env.messages.error(SYNTAX, tree, "dc.tag.unknown", tagName);
}
@Override
public Void visitValue(ValueTree tree, Void ignore) {
ReferenceTree ref = tree.getReference();
if (ref == null || ref.getSignature().isEmpty()) {
if (!isConstant(env.currElement))
env.messages.error(REFERENCE, tree, "dc.value.not.allowed.here");
} else {
Element e = env.trees.getElement(new DocTreePath(getCurrentPath(), ref));
if (!isConstant(e))
env.messages.error(REFERENCE, tree, "dc.value.not.a.constant");
}
markEnclosingTag(Flag.HAS_INLINE_TAG);
return super.visitValue(tree, ignore);
}
private boolean isConstant(Element e) {
if (e == null)
return false;
switch (e.getKind()) {
case FIELD:
Object value = ((VariableElement) e).getConstantValue();
return (value != null); // can't distinguish "not a constant" from "constant is null"
default:
return false;
}
}
@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>
}
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