/*

 * Copyright (c) 2001, 2016, 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

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package jdk.javadoc.internal.doclets.toolkit.taglets;

import java.io.*;

import java.lang.reflect.Method;

import java.util.*;

import javax.lang.model.element.Element;

import javax.lang.model.element.ExecutableElement;

import javax.lang.model.element.PackageElement;

import javax.lang.model.element.TypeElement;

import javax.lang.model.element.VariableElement;

import javax.lang.model.util.SimpleElementVisitor9;

import javax.tools.JavaFileManager;

import javax.tools.StandardJavaFileManager;

import com.sun.source.doctree.DocTree;

import com.sun.tools.javac.util.DefinedBy;

import com.sun.tools.javac.util.DefinedBy.Api;

import jdk.javadoc.internal.doclets.toolkit.util.CommentHelper;

import jdk.javadoc.internal.doclets.toolkit.util.MessageRetriever;

import jdk.javadoc.internal.doclets.toolkit.util.Utils;

import static javax.tools.DocumentationTool.Location.*;

import static com.sun.source.doctree.DocTree.Kind.*;

/**

 * Manages the {@code Taglet}s used by doclets.

 *

 *  <p><b>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>

 *

 * @author Jamie Ho

 */

public class TagletManager {

    /**

     * The default separator for the simple tag option.

     */

    public static final char SIMPLE_TAGLET_OPT_SEPARATOR = ':';

    /**

     * The alternate separator for simple tag options.  Use this

     * when you want the default separator to be in the name of the

     * custom tag.

     */

    public static final String ALT_SIMPLE_TAGLET_OPT_SEPARATOR = "-";

    /**

     * The map of custom tags.

     */

    private final LinkedHashMap<String,Taglet> customTags;

    /**

     * The array of custom tags that can appear in packages.

     */

    private List<Taglet> packageTags;

    /**

     * The array of custom tags that can appear in classes or interfaces.

     */

    private List<Taglet> typeTags;

    /**

     * The array of custom tags that can appear in fields.

     */

    private List<Taglet> fieldTags;

    /**

     * The array of custom tags that can appear in constructors.

     */

    private List<Taglet> constructorTags;

    /**

     * The array of custom tags that can appear in methods.

     */

    private List<Taglet> methodTags;

    /**

     * The array of custom tags that can appear in the overview.

     */

    private List<Taglet> overviewTags;

    /**

     * The array of custom tags that can appear in comments.

     */

    private List<Taglet> inlineTags;

    /**

     * The array of custom tags that can appear in the serialized form.

     */

    private List<Taglet> serializedFormTags;

    /**

     * The message retriever that will be used to print error messages.

     */

    private final MessageRetriever message;

    /**

     * Keep track of standard tags.

     */

    private final Set<String> standardTags;

    /**

     * Keep track of standard tags in lowercase to compare for better

     * error messages when a tag like @docRoot is mistakenly spelled

     * lowercase @docroot.

     */

    private final Set<String> standardTagsLowercase;

    /**

     * Keep track of overriden standard tags.

     */

    private final Set<String> overridenStandardTags;

    /**

     * Keep track of the tags that may conflict

     * with standard tags in the future (any custom tag without

     * a period in its name).

     */

    private final Set<String> potentiallyConflictingTags;

    /**

     * The set of unseen custom tags.

     */

    private final Set<String> unseenCustomTags;

    /**

     * True if we do not want to use @since tags.

     */

    private final boolean nosince;

    /**

     * True if we want to use @version tags.

     */

    private final boolean showversion;

    /**

     * True if we want to use @author tags.

     */

    private final boolean showauthor;

    /**

     * True if we want to use JavaFX-related tags (@propertyGetter,

     * @propertySetter, @propertyDescription, @defaultValue, @treatAsPrivate).

     */

    private final boolean javafx;

    /**

     * Construct a new <code>TagletManager</code>.

     * @param nosince true if we do not want to use @since tags.

     * @param showversion true if we want to use @version tags.

     * @param showauthor true if we want to use @author tags.

     * @param javafx indicates whether javafx is active.

     * @param message the message retriever to print warnings.

     */

    public TagletManager(boolean nosince, boolean showversion,

                         boolean showauthor, boolean javafx,

                         MessageRetriever message) {

        overridenStandardTags = new HashSet<>();

        potentiallyConflictingTags = new HashSet<>();

        standardTags = new HashSet<>();

        standardTagsLowercase = new HashSet<>();

        unseenCustomTags = new HashSet<>();

        customTags = new LinkedHashMap<>();

        this.nosince = nosince;

        this.showversion = showversion;

        this.showauthor = showauthor;

        this.javafx = javafx;

        this.message = message;

        initStandardTaglets();

        initStandardTagsLowercase();

    }

    /**

     * Add a new <code>CustomTag</code>.  This is used to add a Taglet from within

     * a Doclet.  No message is printed to indicate that the Taglet is properly

     * registered because these Taglets are typically added for every execution of the

     * Doclet.  We don't want to see this type of error message every time.

     * @param customTag the new <code>CustomTag</code> to add.

     */

    public void addCustomTag(Taglet customTag) {

        if (customTag != null) {

            String name = customTag.getName();

            if (customTags.containsKey(name)) {

                customTags.remove(name);

            }

            customTags.put(name, customTag);

            checkTagName(name);

        }

    }

    public Set<String> getCustomTagNames() {

        return customTags.keySet();

    }

    /**

     * Add a new <code>Taglet</code>.  Print a message to indicate whether or not

     * the Taglet was registered properly.

     * @param classname  the name of the class representing the custom tag.

     * @param fileManager the filemanager to load classes and resources.

     * @param tagletPath  the path to the class representing the custom tag.

     */

    public void addCustomTag(String classname, JavaFileManager fileManager, String tagletPath) {

        try {

            ClassLoader tagClassLoader = null;

            if (!fileManager.hasLocation(TAGLET_PATH)) {

                List<File> paths = new ArrayList<>();

                if (tagletPath != null) {

                    for (String pathname : tagletPath.split(File.pathSeparator)) {

                        paths.add(new File(pathname));

                    }

                }

                if (fileManager instanceof StandardJavaFileManager) {

                    ((StandardJavaFileManager) fileManager).setLocation(TAGLET_PATH, paths);

                }

            }

            tagClassLoader = fileManager.getClassLoader(TAGLET_PATH);

            Class<?> customTagClass = tagClassLoader.loadClass(classname);

            ensureReadable(customTagClass);

            Object instance = customTagClass.newInstance();

            Taglet newLegacy = new UserTaglet((jdk.javadoc.doclet.taglet.Taglet)instance);

            String tname = newLegacy.getName();

            Taglet t = customTags.get(tname);

            if (t != null) {

                customTags.remove(tname);

            }

            customTags.put(tname, newLegacy);

            message.notice("doclet.Notice_taglet_registered", classname);

        } catch (Exception exc) {

            message.error("doclet.Error_taglet_not_registered", exc.getClass().getName(), classname);

        }

    }

    /**

     * Ensures that the module of the given class is readable to this

     * module.

     * @param targetClass class in module to be made readable

     */

    private void ensureReadable(Class<?> targetClass) {

        try {

            Method getModuleMethod = Class.class.getMethod("getModule");

            Object thisModule = getModuleMethod.invoke(this.getClass());

            Object targetModule = getModuleMethod.invoke(targetClass);

            Class<?> moduleClass = getModuleMethod.getReturnType();

            Method addReadsMethod = moduleClass.getMethod("addReads", moduleClass);

            addReadsMethod.invoke(thisModule, targetModule);

        } catch (NoSuchMethodException e) {

            // ignore

        } catch (Exception e) {

            throw new InternalError(e.toString());

        }

    }

    /**

     * Add a new <code>SimpleTaglet</code>.  If this tag already exists

     * and the header passed as an argument is null, move tag to the back of the

     * list. If this tag already exists and the header passed as an argument is

     * not null, overwrite previous tag with new one.  Otherwise, add new

     * SimpleTaglet to list.

     * @param tagName the name of this tag

     * @param header the header to output.

     * @param locations the possible locations that this tag

     * can appear in.

     */

    public void addNewSimpleCustomTag(String tagName, String header, String locations) {

        if (tagName == null || locations == null) {

            return;

        }

        Taglet tag = customTags.get(tagName);

        locations = Utils.toLowerCase(locations);

        if (tag == null || header != null) {

            customTags.remove(tagName);

            customTags.put(tagName, new SimpleTaglet(tagName, header, locations));

            if (locations != null && locations.indexOf('x') == -1) {

                checkTagName(tagName);

            }

        } else {

            //Move to back

            customTags.remove(tagName);

            customTags.put(tagName, tag);

        }

    }

    /**

     * Given a tag name, add it to the set of tags it belongs to.

     */

    private void checkTagName(String name) {

        if (standardTags.contains(name)) {

            overridenStandardTags.add(name);

        } else {

            if (name.indexOf('.') == -1) {

                potentiallyConflictingTags.add(name);

            }

            unseenCustomTags.add(name);

        }

    }

    /**

     * Check the taglet to see if it is a legacy taglet.  Also

     * check its name for errors.

     */

    private void checkTaglet(Object taglet) {

        if (taglet instanceof Taglet) {

            checkTagName(((Taglet) taglet).getName());

        } else if (taglet instanceof jdk.javadoc.doclet.taglet.Taglet) {

            jdk.javadoc.doclet.taglet.Taglet legacyTaglet = (jdk.javadoc.doclet.taglet.Taglet) taglet;

            customTags.remove(legacyTaglet.getName());

            customTags.put(legacyTaglet.getName(), new UserTaglet(legacyTaglet));

            checkTagName(legacyTaglet.getName());

        } else {

            throw new IllegalArgumentException("Given object is not a taglet.");

        }

    }

    /**

     * Given a name of a seen custom tag, remove it from the set of unseen

     * custom tags.

     * @param name the name of the seen custom tag.

     */

    public void seenCustomTag(String name) {

        unseenCustomTags.remove(name);

    }

    /**

     * Given an array of <code>Tag</code>s, check for spelling mistakes.

     * @param utils the utility class to use

     * @param element the tags holder

     * @param trees the trees containing the comments

     * @param areInlineTags true if the array of tags are inline and false otherwise.

     */

    public void checkTags(final Utils utils, Element element,

                          Iterable<? extends DocTree> trees, boolean areInlineTags) {

        if (trees == null) {

            return;

        }

        CommentHelper ch = utils.getCommentHelper(element);

        for (DocTree tag : trees) {

            String name = tag.getKind().tagName;

            if (name == null) {

                continue;

            }

            if (name.length() > 0 && name.charAt(0) == '@') {

                name = name.substring(1, name.length());

            }

            if (! (standardTags.contains(name) || customTags.containsKey(name))) {

                if (standardTagsLowercase.contains(Utils.toLowerCase(name))) {

                    message.warning(ch.getDocTreePath(tag), "doclet.UnknownTagLowercase", ch.getTagName(tag));

                    continue;

                } else {

                    message.warning(ch.getDocTreePath(tag), "doclet.UnknownTag", ch.getTagName(tag));

                    continue;

                }

            }

            final Taglet taglet = customTags.get(name);

            // Check and verify tag usage

            if (taglet != null) {

                if (areInlineTags && !taglet.isInlineTag()) {

                    printTagMisuseWarn(ch, taglet, tag, "inline");

                }

                // nothing more to do

                if (element == null) {

                    return;

                }

                new SimpleElementVisitor9<Void, Void>() {

                    @Override @DefinedBy(Api.LANGUAGE_MODEL)

                    public Void visitPackage(PackageElement e, Void p) {

                        if (!taglet.inPackage()) {

                            printTagMisuseWarn(utils.getCommentHelper(e), taglet, tag, "package");

                        }

                        return null;

                    }

                    @Override @DefinedBy(Api.LANGUAGE_MODEL)

                    public Void visitType(TypeElement e, Void p) {

                        if (!taglet.inType()) {

                            printTagMisuseWarn(utils.getCommentHelper(e), taglet, tag, "class");

                        }

                        return null;

                    }

                    @Override @DefinedBy(Api.LANGUAGE_MODEL)

                    public Void visitExecutable(ExecutableElement e, Void p) {

                        if (utils.isConstructor(e) && !taglet.inConstructor()) {

                            printTagMisuseWarn(utils.getCommentHelper(e), taglet, tag, "constructor");

                        } else if (!taglet.inMethod()) {

                            printTagMisuseWarn(utils.getCommentHelper(e), taglet, tag, "method");

                        }

                        return null;

                    }

                    @Override @DefinedBy(Api.LANGUAGE_MODEL)

                    public Void visitVariable(VariableElement e, Void p) {

                        if (utils.isField(e) && !taglet.inField()) {

                            printTagMisuseWarn(utils.getCommentHelper(e), taglet, tag, "field");

                        }

                        return null;

                    }

                    @Override @DefinedBy(Api.LANGUAGE_MODEL)

                    public Void visitUnknown(Element e, Void p) {

                        if (utils.isOverviewElement(e) && !taglet.inOverview()) {

                            printTagMisuseWarn(utils.getCommentHelper(e), taglet, tag, "overview");

                        }

                        return null;

                    }

                    @Override @DefinedBy(Api.LANGUAGE_MODEL)

                    protected Void defaultAction(Element e, Void p) {

                        return null;

                    }

                }.visit(element);

            }

        }

    }

    /**

     * Given the taglet, the tag and the type of documentation that the tag

     * was found in, print a tag misuse warning.

     * @param taglet the taglet representing the misused tag.

     * @param tag the misused tag.

     * @param holderType the type of documentation that the misused tag was found in.

     */

    private void printTagMisuseWarn(CommentHelper ch, Taglet taglet, DocTree tag, String holderType) {

        Set<String> locationsSet = new LinkedHashSet<>();

        if (taglet.inOverview()) {

            locationsSet.add("overview");

        }

        if (taglet.inPackage()) {

            locationsSet.add("package");

        }

        if (taglet.inType()) {

            locationsSet.add("class/interface");

        }

        if (taglet.inConstructor())  {

            locationsSet.add("constructor");

        }

        if (taglet.inField()) {

            locationsSet.add("field");

        }

        if (taglet.inMethod()) {

            locationsSet.add("method");

        }

        if (taglet.isInlineTag()) {

            locationsSet.add("inline text");

        }

        String[] locations = locationsSet.toArray(new String[]{});

        if (locations == null || locations.length == 0) {

            //This known tag is excluded.

            return;

        }

        StringBuilder combined_locations = new StringBuilder();

        for (int i = 0; i < locations.length; i++) {

            if (i > 0) {

                combined_locations.append(", ");

            }

            combined_locations.append(locations[i]);

        }

        message.warning(ch.getDocTreePath(tag), "doclet.tag_misuse",

            "@" + taglet.getName(), holderType, combined_locations.toString());

    }

    /**

     * Return the array of <code>Taglet</code>s that can

     * appear in packages.

     * @return the array of <code>Taglet</code>s that can

     * appear in packages.

     */

    public List<Taglet> getPackageCustomTaglets() {

        if (packageTags == null) {

            initCustomTaglets();

        }

        return packageTags;

    }

    /**