001////////////////////////////////////////////////////////////////////////////////
002// checkstyle: Checks Java source code for adherence to a set of rules.
003// Copyright (C) 2001-2017 the original author or authors.
004//
005// This library is free software; you can redistribute it and/or
006// modify it under the terms of the GNU Lesser General Public
007// License as published by the Free Software Foundation; either
008// version 2.1 of the License, or (at your option) any later version.
009//
010// This library is distributed in the hope that it will be useful,
011// but WITHOUT ANY WARRANTY; without even the implied warranty of
012// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
013// Lesser General Public License for more details.
014//
015// You should have received a copy of the GNU Lesser General Public
016// License along with this library; if not, write to the Free Software
017// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
018////////////////////////////////////////////////////////////////////////////////
019
020package com.puppycrawl.tools.checkstyle.checks.javadoc;
021
022import java.util.regex.Matcher;
023import java.util.regex.Pattern;
024
025import com.puppycrawl.tools.checkstyle.StatelessCheck;
026import com.puppycrawl.tools.checkstyle.api.AbstractCheck;
027import com.puppycrawl.tools.checkstyle.api.DetailAST;
028import com.puppycrawl.tools.checkstyle.api.FileContents;
029import com.puppycrawl.tools.checkstyle.api.SeverityLevel;
030import com.puppycrawl.tools.checkstyle.api.TextBlock;
031import com.puppycrawl.tools.checkstyle.api.TokenTypes;
032import com.puppycrawl.tools.checkstyle.utils.CommonUtils;
033
034/**
035 * <p>
036 * Outputs a JavaDoc tag as information. Can be used e.g. with the stylesheets
037 * that sort the report by author name.
038 * To define the format for a tag, set property tagFormat to a
039 * regular expression.
040 * This check uses two different severity levels. The normal one is used for
041 * reporting when the tag is missing. The additional one (tagSeverity) is used
042 * for the level of reporting when the tag exists. The default value for
043 * tagSeverity is info.
044 * </p>
045 * <p> An example of how to configure the check for printing author name is:
046 *</p>
047 * <pre>
048 * &lt;module name="WriteTag"&gt;
049 *    &lt;property name="tag" value="@author"/&gt;
050 *    &lt;property name="tagFormat" value="\S"/&gt;
051 * &lt;/module&gt;
052 * </pre>
053 * <p> An example of how to configure the check to print warnings if an
054 * "@incomplete" tag is found, and not print anything if it is not found:
055 *</p>
056 * <pre>
057 * &lt;module name="WriteTag"&gt;
058 *    &lt;property name="tag" value="@incomplete"/&gt;
059 *    &lt;property name="tagFormat" value="\S"/&gt;
060 *    &lt;property name="severity" value="ignore"/&gt;
061 *    &lt;property name="tagSeverity" value="warning"/&gt;
062 * &lt;/module&gt;
063 * </pre>
064 *
065 * @author Daniel Grenner
066 */
067@StatelessCheck
068public class WriteTagCheck
069    extends AbstractCheck {
070
071    /**
072     * A key is pointing to the warning message text in "messages.properties"
073     * file.
074     */
075    public static final String MSG_MISSING_TAG = "type.missingTag";
076
077    /**
078     * A key is pointing to the warning message text in "messages.properties"
079     * file.
080     */
081    public static final String MSG_WRITE_TAG = "javadoc.writeTag";
082
083    /**
084     * A key is pointing to the warning message text in "messages.properties"
085     * file.
086     */
087    public static final String MSG_TAG_FORMAT = "type.tagFormat";
088
089    /** Compiled regexp to match tag. **/
090    private Pattern tagRegExp;
091    /** Compiled regexp to match tag content. **/
092    private Pattern tagFormat;
093
094    /** Regexp to match tag. */
095    private String tag;
096    /** The severity level of found tag reports. */
097    private SeverityLevel tagSeverity = SeverityLevel.INFO;
098
099    /**
100     * Sets the tag to check.
101     * @param tag tag to check
102     */
103    public void setTag(String tag) {
104        this.tag = tag;
105        tagRegExp = CommonUtils.createPattern(tag + "\\s*(.*$)");
106    }
107
108    /**
109     * Set the tag format.
110     * @param pattern a {@code String} value
111     */
112    public void setTagFormat(Pattern pattern) {
113        tagFormat = pattern;
114    }
115
116    /**
117     * Sets the tag severity level.
118     *
119     * @param severity  The new severity level
120     * @see SeverityLevel
121     */
122    public final void setTagSeverity(SeverityLevel severity) {
123        tagSeverity = severity;
124    }
125
126    @Override
127    public int[] getDefaultTokens() {
128        return new int[] {TokenTypes.INTERFACE_DEF,
129                          TokenTypes.CLASS_DEF,
130                          TokenTypes.ENUM_DEF,
131                          TokenTypes.ANNOTATION_DEF,
132        };
133    }
134
135    @Override
136    public int[] getAcceptableTokens() {
137        return new int[] {TokenTypes.INTERFACE_DEF,
138                          TokenTypes.CLASS_DEF,
139                          TokenTypes.ENUM_DEF,
140                          TokenTypes.ANNOTATION_DEF,
141                          TokenTypes.METHOD_DEF,
142                          TokenTypes.CTOR_DEF,
143                          TokenTypes.ENUM_CONSTANT_DEF,
144                          TokenTypes.ANNOTATION_FIELD_DEF,
145        };
146    }
147
148    @Override
149    public int[] getRequiredTokens() {
150        return CommonUtils.EMPTY_INT_ARRAY;
151    }
152
153    @Override
154    public void visitToken(DetailAST ast) {
155        final FileContents contents = getFileContents();
156        final int lineNo = ast.getLineNo();
157        final TextBlock cmt =
158            contents.getJavadocBefore(lineNo);
159        if (cmt == null) {
160            log(lineNo, MSG_MISSING_TAG, tag);
161        }
162        else {
163            checkTag(lineNo, cmt.getText());
164        }
165    }
166
167    /**
168     * Verifies that a type definition has a required tag.
169     * @param lineNo the line number for the type definition.
170     * @param comment the Javadoc comment for the type definition.
171     */
172    private void checkTag(int lineNo, String... comment) {
173        if (tagRegExp != null) {
174            int tagCount = 0;
175            for (int i = 0; i < comment.length; i++) {
176                final String commentValue = comment[i];
177                final Matcher matcher = tagRegExp.matcher(commentValue);
178                if (matcher.find()) {
179                    tagCount += 1;
180                    final int contentStart = matcher.start(1);
181                    final String content = commentValue.substring(contentStart);
182                    if (tagFormat == null || tagFormat.matcher(content).find()) {
183                        logTag(lineNo + i - comment.length, tag, content);
184                    }
185                    else {
186                        log(lineNo + i - comment.length, MSG_TAG_FORMAT, tag, tagFormat.pattern());
187                    }
188                }
189            }
190            if (tagCount == 0) {
191                log(lineNo, MSG_MISSING_TAG, tag);
192            }
193        }
194    }
195
196    /**
197     * Log a message.
198     *
199     * @param line the line number where the error was found
200     * @param tagName the javadoc tag to be logged
201     * @param tagValue the contents of the tag
202     *
203     * @see java.text.MessageFormat
204     */
205    private void logTag(int line, String tagName, String tagValue) {
206        final String originalSeverity = getSeverity();
207        setSeverity(tagSeverity.getName());
208
209        log(line, MSG_WRITE_TAG, tagName, tagValue);
210
211        setSeverity(originalSeverity);
212    }
213}