Skip to content
Browse files
8267709: Investigate differences between HtmlStyle and stylesheet.css
Reviewed-by: hannesw
  • Loading branch information
jonathan-gibbons committed May 27, 2021
1 parent 23189a1 commit 07542660446e47164e5a402380bdf7cbfd7b37ad
Showing 2 changed files with 222 additions and 1 deletion.
@@ -770,7 +770,7 @@ public enum HtmlStyle {

* The class of the {@code body} element for the page listing any deprecated items.
* The class of the {@code body} element for the page listing any preview items.

@@ -0,0 +1,221 @@
* Copyright (c) 2021, Oracle and/or its affiliates. All rights reserved.
* 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.
* 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 if you need additional information or have any
* questions.

* @test
* @bug 8267574
* @summary check stylesheet names against HtmlStyle
* @modules jdk.javadoc/jdk.javadoc.internal.doclets.formats.html.markup
* jdk.javadoc/jdk.javadoc.internal.doclets.toolkit.resources:open

import java.nio.file.Files;
import java.nio.file.Path;
import java.util.Arrays;
import java.util.Set;
import java.util.TreeSet;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import jdk.javadoc.internal.doclets.formats.html.markup.HtmlStyle;

* This test compares the set of CSS class names defined in HtmlStyle
* and other files (such as search.js) against the set of CSS class names
* defined in the main stylesheet.css provided by the doclet.
* The goal is to detect "unexpected" discrepancies between the two sets.
* "Expected" discrepancies are taken into account, but may indicate a
* need to resolve the discrepancy.
* The test does not take into direct account the recent introduction of
* CSS constructs like section {@code [class$="-details"]}
public class CheckStylesheetClasses {
public static void main(String... args) throws Exception {
CheckStylesheetClasses c = new CheckStylesheetClasses();;

int errors = 0;

void run() throws Exception {
Set<String> htmlStyleNames = getHtmlStyleNames();
Set<String> styleSheetNames = getStylesheetNames();

System.err.println("found " + htmlStyleNames.size() + " names in HtmlStyle");
System.err.println("found " + styleSheetNames.size() + " names in stylesheet");

// Write the lists to external files for the benefit of external diff tools:
// for example, to compare against the CSS class names used in generated documentation.
// To find the classes used in a directory containing HTML files, use something like
// find $DIRECTORY -name \*.html | \
// xargs grep -o 'class="[^"]*"' | \
// sed -e 's/^[^"]*"//' -e 's/".*$//' | \
// while read line ; do for w in $line ; do echo $w ; done ; done | \
// sort -u

try (BufferedWriter out = Files.newBufferedWriter(Path.of("htmlStyleNames.txt"));
PrintWriter pw = new PrintWriter(out)) {

try (BufferedWriter out = Files.newBufferedWriter(Path.of("styleSheetNames.txt"));
PrintWriter pw = new PrintWriter(out)) {

// Remove names from htmlStyleNames if they are valid names generated by the doclet,
// even if they do not by default require a style to be defined in the stylesheet.
// In general, names in these lists are worthy of attention to see if they *should*
// be defined in the stylesheet, especially when the names exist in a family of
// related items: related by name or by function.

// the page names are provided to override a style on a specific page;
// only some are used in the stylesheet
htmlStyleNames.removeIf(s -> s.endsWith("-page") && !styleSheetNames.contains(s));

// descriptions; class-description is used;
// surprisingly? module-description and package-description are not
htmlStyleNames.removeIf(s -> s.endsWith("-description") && !styleSheetNames.contains(s));

// help page
htmlStyleNames.removeIf(s -> s.startsWith("help-") && !styleSheetNames.contains(s));

// summary and details tables; styles for these may be present in the stylesheet
// using constructs like these:
// .summary section[class$="-summary"], .details section[class$="-details"],
htmlStyleNames.removeIf(s -> s.endsWith("-details"));
htmlStyleNames.removeIf(s -> s.endsWith("-summary") && !styleSheetNames.contains(s));

// signature classes
removeAll(htmlStyleNames, "annotations", "element-name", "extends-implements",
"modifiers", "permits", "return-type");

// misc: these are defined in HtmlStyle, and used by the doclet
removeAll(htmlStyleNames, "col-plain", "details-table", "external-link",
"hierarchy", "index", "package-uses", "packages", "permits-note",
"serialized-package-container", "source-container");

// Remove names from styleSheetNames if they are false positives,
// or used by other code (i.e. not HtmlStyle),
// or if they are unused and therefore candidates to be deleted.

// false positives: file extensions and URL components
removeAll(styleSheetNames, "css", "png", "w3");

// for doc-comment authors; maybe worthy of inclusion in HtmlStyle, just to be documented
removeAll(styleSheetNames, "borderless", "plain", "striped");

// used in search.js; may be worth documenting in HtmlStyle
removeAll(styleSheetNames, "result-highlight", "result-item",
"search-tag-desc-result", "search-tag-holder-result",
"ui-autocomplete", "ui-autocomplete-category",

// very JDK specific

// apparently unused
// "tab" is commented implying it is in the header/footer, but
// (a) it is a poorly chosen name
// (b) it does not seem to be used in make/Docs.gmk or anywhere else
removeAll(styleSheetNames, "all-classes-container", "all-packages-container",
"bottom-nav", "clear", "constant-values-container", "deprecated-content",
"footer", "hidden", "override-specify-label", "serialized-class-details",
"tab", "table-sub-heading-color");

boolean ok = check(htmlStyleNames, "HtmlStyle", styleSheetNames, "stylesheet")
& check(styleSheetNames, "stylesheet", htmlStyleNames, "HtmlStyle");

if (!ok) {
throw new Exception("differences found");

if (errors > 0) {
throw new Exception(errors + " errors found");

boolean check(Set<String> s1, String l1, Set<String> s2, String l2) {
boolean equal = true;
for (String s : s1) {
if (!s2.contains(s)) {
System.err.println("In " + l1 + " but not " + l2 + ": " + s);
equal = false;
return equal;

* Remove all the names from the set, giving a message for any that were not found.
void removeAll(Set<String> set, String... names) {
for (String name : names) {
if (!set.remove(name)) {
error("name not found in set: " + name);

void error(String message) {
System.err.println("error: " + message);

Set<String> getHtmlStyleNames() {

Set<String> getStylesheetNames() throws IOException {
Set<String> names = new TreeSet<>();
String stylesheet = "/jdk/javadoc/internal/doclets/toolkit/resources/stylesheet.css";
URL url = HtmlStyle.class.getResource(stylesheet);
readStylesheet(url, names);
return names;

private void readStylesheet(URL resource, Set<String> names) throws IOException {
try (InputStream in = resource.openStream()) {
if (in == null) {
throw new AssertionError("Cannot find or access resource " + resource);
String s = new String(in.readAllBytes());
Pattern p = Pattern.compile("(?i)(\\s|([a-z][a-z0-9-]*))\\.(?<name>[a-z0-9-]+)\\b");
Matcher m = p.matcher(s);
while (m.find()) {

1 comment on commit 0754266

Copy link

@openjdk-notifier openjdk-notifier bot commented on 0754266 May 27, 2021

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

Please sign in to comment.