lucene/solr/solr-ref-guide/tools/BuildNavDataFiles.java

298 lines
11 KiB
Java

/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
import java.io.*;
import java.io.FilenameFilter;
import java.util.*;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.concurrent.atomic.AtomicReference;
import org.json.*;
import org.asciidoctor.Asciidoctor.Factory;
import org.asciidoctor.Asciidoctor;
import org.asciidoctor.ast.DocumentHeader;
public class BuildNavDataFiles {
public static void main(String[] args) throws Exception {
if (args.length != 2) {
throw new RuntimeException("Wrong # of args: " + args.length);
}
final File adocDir = new File(args[0]);
final String mainPageShortname = args[1];
if (! adocDir.exists()) {
throw new RuntimeException("asciidoc directory does not exist: " + adocDir.toString());
}
// build up a quick mapping of every known page
System.out.println("Building up tree of all known pages");
final Map<String,Page> allPages = new LinkedHashMap<String,Page>();
Asciidoctor doctor = null;
try {
doctor = Factory.create();
final File[] adocFiles = adocDir.listFiles(ADOC_FILE_NAMES);
for (File file : adocFiles) {
Page page = new Page(file, doctor.readDocumentHeader(file));
if (allPages.containsKey(page.shortname)) {
throw new RuntimeException("multiple pages with same shortname: " + page.file.toString() + " and " + allPages.get(page.shortname));
}
allPages.put(page.shortname, page);
}
} finally {
if (null != doctor) {
doctor.shutdown();
doctor = null;
}
}
// build up a hierarchical structure rooted at our mainPage
final Page mainPage = allPages.get(mainPageShortname);
if (null == mainPage) {
throw new RuntimeException("no main-page found with shortname: " + mainPageShortname);
}
// NOTE: mainPage claims to be its own parent to prevent anyone decendent from introducing a loop
mainPage.buildPageTreeRecursive(mainPage, allPages);
{ // validate that there are no orphan pages
int orphans = 0;
for (Page p : allPages.values()) {
if (null == p.getParent()) {
orphans++;
System.err.println("ERROR: Orphan page: " + p.file);
}
}
if (0 != orphans) {
throw new RuntimeException("Found " + orphans + " orphan pages (which are not in the 'page-children' attribute of any other pages)");
}
}
// Loop over all files "in order" to build up next/prev maps for use in building the scrollnav
final Map<String,Page> nextPage = new HashMap<String,Page>();
final Map<String,Page> prevPage = new HashMap<String,Page>();
System.out.println("Looping over pages to build nav data");
{ // the previous page seen during our walk
AtomicReference<Page> previous = new AtomicReference<Page>();
mainPage.depthFirstWalk(new Page.RecursiveAction() {
public boolean act(Page page) {
if (null != previous.get()) {
// add previous as our 'prev' page, and ourselves as the 'next' of previous
prevPage.put(page.shortname, previous.get());
nextPage.put(previous.get().shortname, page);
}
previous.set(page);
return true;
}
});
}
// Build up the scrollnav file for jekyll's footer
File scrollnavFile = new File(new File(adocDir, "_data"), "scrollnav.json");
if (scrollnavFile.exists()) {
throw new RuntimeException(scrollnavFile.toString() + " already exists");
}
System.out.println("Creating " + scrollnavFile.toString());
try (Writer w = new OutputStreamWriter(new FileOutputStream(scrollnavFile), "UTF-8")) {
JSONObject scrollnav = new JSONObject();
for (Page p : allPages.values()) {
JSONObject current = new JSONObject();
Page prev = prevPage.get(p.shortname);
Page next = nextPage.get(p.shortname);
if (null != prev) {
current.put("prev",
new JSONObject()
.put("url", prev.permalink)
.put("title", prev.title));
}
if (null != next) {
current.put("next",
new JSONObject()
.put("url", next.permalink)
.put("title", next.title));
}
scrollnav.put(p.shortname, current);
}
// HACK: jekyll doesn't like escaped forward slashes in it's JSON?
w.write(scrollnav.toString(2).replaceAll("\\\\/","/"));
}
// Build up the sidebar file for jekyll
File sidebarFile = new File(new File(adocDir, "_data"), "sidebar.json");
if (sidebarFile.exists()) {
throw new RuntimeException(sidebarFile.toString() + " already exists");
}
System.out.println("Creating " + sidebarFile.toString());
try (Writer w = new OutputStreamWriter(new FileOutputStream(sidebarFile), "UTF-8")) {
// A stack for tracking what we're working on as we recurse
final Stack<JSONObject> stack = new Stack<JSONObject>();
mainPage.depthFirstWalk(new Page.RecursiveAction() {
public boolean act(Page page) {
final int depth = stack.size();
if (4 < depth) {
System.err.println("ERROR: depth==" + depth + " for " + page.permalink);
System.err.println("sidebar.html template can not support pages this deep");
System.exit(-1);
}
try {
final JSONObject current = new JSONObject()
.put("title",page.title)
.put("url", page.permalink)
.put("depth", depth)
.put("kids", new JSONArray());
if (0 < depth) {
JSONObject parent = stack.peek();
((JSONArray)parent.get("kids")).put(current);
}
stack.push(current);
} catch (JSONException e) {
throw new RuntimeException(e);
}
return true;
}
public void postKids(Page page) {
final JSONObject current = stack.pop();
if (0 == stack.size()) {
assert page == mainPage;
try {
// HACK: jekyll doesn't like escaped forward slashes in it's JSON?
w.write(current.toString(2).replaceAll("\\\\/","/"));
} catch (IOException | JSONException e) {
throw new RuntimeException(e);
}
}
}
});
}
}
/** Simple struct for modeling the key metadata for dealing with page navigation */
public static final class Page {
public final File file;
public final String title; // NOTE: has html escape codes in it
public final String shortname;
public final String permalink;
public final List<String> kidShortnames;
/** NOTE: not populated on construction
* @see #buildPageTreeRecursive
*/
private Page parent;
public Page getParent() {
return parent;
}
/** NOTE: not populated on construction
* @see #buildPageTreeRecursive
*/
public final List<Page> kids;
private final List<Page> mutableKids;
public Page(File file, DocumentHeader header) {
if (! file.getName().endsWith(".adoc")) {
throw new RuntimeException(file + " has does not end in '.adoc' - this code can't be used");
}
this.file = file;
this.title = header.getDocumentTitle().getMain();
this.shortname = file.getName().replaceAll("\\.adoc$","");
this.permalink = this.shortname + ".html";
// TODO: do error checking if attribute metadata we care about is missing
Map<String,Object> attrs = header.getAttributes();
// See SOLR-11541: Fail if a user adds new docs with older missleading attributes we don't use/want
for (String attr : Arrays.asList("page-shortname", "page-permalink")) {
if (attrs.containsKey(attr)) {
throw new RuntimeException(file + ": remove the " + attr + " attribute, it's no longer needed, and may confuse readers/editors");
}
}
if (attrs.containsKey("page-children")) {
String kidsString = ((String) attrs.get("page-children")).trim();
this.kidShortnames = Collections.<String>unmodifiableList
(Arrays.asList(kidsString.split(",\\s+")));
this.mutableKids = new ArrayList<Page>(kidShortnames.size());
} else {
this.kidShortnames = Collections.<String>emptyList();
this.mutableKids = Collections.<Page>emptyList();
}
this.kids = Collections.<Page>unmodifiableList(mutableKids);
}
/**
* Recursively sets {@link #getParent} and populates {@link #kids} from {@link #kidShortnames}
* via the <code>allPages</code> Map
*/
public void buildPageTreeRecursive(Page parent, Map<String,Page> allPages) {
if (null != parent) {
if (null != this.parent) {
// as long as we also check (later) that every page has a parent, this check (prior to recusion)
// also ensures we never have any loops
throw new RuntimeException(file.getName() + " is listed as the child of (at least) 2 pages: '" + parent.shortname + "' and '" + this.parent.shortname + "'");
}
this.parent = parent;
}
for (String kidShortname : kidShortnames) {
Page kid = allPages.get(kidShortname);
if (null == kid) {
throw new RuntimeException("Unable to locate " + kidShortname + "; child of " + shortname + "("+file.toString());
}
mutableKids.add(kid);
kid.buildPageTreeRecursive(this, allPages);
}
}
/**
* Do a depth first recursive action on this node and it's {@link #kids}
* @see RecursiveAction
*/
public void depthFirstWalk(RecursiveAction action) {
if (action.act(this)) {
for (Page kid : kids) {
kid.depthFirstWalk(action);
}
action.postKids(this);
}
}
/** @see #depthFirstWalk */
public static interface RecursiveAction {
/** return true if kids should also be visited */
public boolean act(Page page);
/**
* called after recusion to each kid (if any) of specified node,
* never called if {@link #act} returned false
*/
public default void postKids(Page page) { /* No-op */ };
}
}
/** Trivial filter for only "*.adoc" files */
public static final FilenameFilter ADOC_FILE_NAMES = new FilenameFilter() {
public boolean accept(File dir, String name) {
return name.endsWith(".adoc");
}
};
}