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The Comment.java Java example source code
/*
* Copyright (c) 1997, 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.javadoc;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import com.sun.javadoc.*;
import com.sun.tools.javac.util.ListBuffer;
/**
* Comment contains all information in comment part.
* It allows users to get first sentence of this comment, get
* comment for different tags...
*
* <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>
*
* @author Kaiyang Liu (original)
* @author Robert Field (rewrite)
* @author Atul M Dambalkar
* @author Neal Gafter (rewrite)
*/
class Comment {
/**
* sorted comments with different tags.
*/
private final ListBuffer<Tag> tagList = new ListBuffer();
/**
* text minus any tags.
*/
private String text;
/**
* Doc environment
*/
private final DocEnv docenv;
/**
* constructor of Comment.
*/
Comment(final DocImpl holder, final String commentString) {
this.docenv = holder.env;
/**
* Separate the comment into the text part and zero to N tags.
* Simple state machine is in one of three states:
* <pre>
* IN_TEXT: parsing the comment text or tag text.
* TAG_NAME: parsing the name of a tag.
* TAG_GAP: skipping through the gap between the tag name and
* the tag text.
* </pre>
*/
@SuppressWarnings("fallthrough")
class CommentStringParser {
/**
* The entry point to the comment string parser
*/
void parseCommentStateMachine() {
final int IN_TEXT = 1;
final int TAG_GAP = 2;
final int TAG_NAME = 3;
int state = TAG_GAP;
boolean newLine = true;
String tagName = null;
int tagStart = 0;
int textStart = 0;
int lastNonWhite = -1;
int len = commentString.length();
for (int inx = 0; inx < len; ++inx) {
char ch = commentString.charAt(inx);
boolean isWhite = Character.isWhitespace(ch);
switch (state) {
case TAG_NAME:
if (isWhite) {
tagName = commentString.substring(tagStart, inx);
state = TAG_GAP;
}
break;
case TAG_GAP:
if (isWhite) {
break;
}
textStart = inx;
state = IN_TEXT;
/* fall thru */
case IN_TEXT:
if (newLine && ch == '@') {
parseCommentComponent(tagName, textStart,
lastNonWhite+1);
tagStart = inx;
state = TAG_NAME;
}
break;
}
if (ch == '\n') {
newLine = true;
} else if (!isWhite) {
lastNonWhite = inx;
newLine = false;
}
}
// Finish what's currently being processed
switch (state) {
case TAG_NAME:
tagName = commentString.substring(tagStart, len);
/* fall thru */
case TAG_GAP:
textStart = len;
/* fall thru */
case IN_TEXT:
parseCommentComponent(tagName, textStart, lastNonWhite+1);
break;
}
}
/**
* Save away the last parsed item.
*/
void parseCommentComponent(String tagName,
int from, int upto) {
String tx = upto <= from ? "" : commentString.substring(from, upto);
if (tagName == null) {
text = tx;
} else {
TagImpl tag;
if (tagName.equals("@exception") || tagName.equals("@throws")) {
warnIfEmpty(tagName, tx);
tag = new ThrowsTagImpl(holder, tagName, tx);
} else if (tagName.equals("@param")) {
warnIfEmpty(tagName, tx);
tag = new ParamTagImpl(holder, tagName, tx);
} else if (tagName.equals("@see")) {
warnIfEmpty(tagName, tx);
tag = new SeeTagImpl(holder, tagName, tx);
} else if (tagName.equals("@serialField")) {
warnIfEmpty(tagName, tx);
tag = new SerialFieldTagImpl(holder, tagName, tx);
} else if (tagName.equals("@return")) {
warnIfEmpty(tagName, tx);
tag = new TagImpl(holder, tagName, tx);
} else if (tagName.equals("@author")) {
warnIfEmpty(tagName, tx);
tag = new TagImpl(holder, tagName, tx);
} else if (tagName.equals("@version")) {
warnIfEmpty(tagName, tx);
tag = new TagImpl(holder, tagName, tx);
} else {
tag = new TagImpl(holder, tagName, tx);
}
tagList.append(tag);
}
}
void warnIfEmpty(String tagName, String tx) {
if (tx.length() == 0) {
docenv.warning(holder, "tag.tag_has_no_arguments", tagName);
}
}
}
new CommentStringParser().parseCommentStateMachine();
}
/**
* Return the text of the comment.
*/
String commentText() {
return text;
}
/**
* Return all tags in this comment.
*/
Tag[] tags() {
return tagList.toArray(new Tag[tagList.length()]);
}
/**
* Return tags of the specified kind in this comment.
*/
Tag[] tags(String tagname) {
ListBuffer<Tag> found = new ListBuffer();
String target = tagname;
if (target.charAt(0) != '@') {
target = "@" + target;
}
for (Tag tag : tagList) {
if (tag.kind().equals(target)) {
found.append(tag);
}
}
return found.toArray(new Tag[found.length()]);
}
/**
* Return throws tags in this comment.
*/
ThrowsTag[] throwsTags() {
ListBuffer<ThrowsTag> found = new ListBuffer();
for (Tag next : tagList) {
if (next instanceof ThrowsTag) {
found.append((ThrowsTag)next);
}
}
return found.toArray(new ThrowsTag[found.length()]);
}
/**
* Return param tags (excluding type param tags) in this comment.
*/
ParamTag[] paramTags() {
return paramTags(false);
}
/**
* Return type param tags in this comment.
*/
ParamTag[] typeParamTags() {
return paramTags(true);
}
/**
* Return param tags in this comment. If typeParams is true
* include only type param tags, otherwise include only ordinary
* param tags.
*/
private ParamTag[] paramTags(boolean typeParams) {
ListBuffer<ParamTag> found = new ListBuffer();
for (Tag next : tagList) {
if (next instanceof ParamTag) {
ParamTag p = (ParamTag)next;
if (typeParams == p.isTypeParameter()) {
found.append(p);
}
}
}
return found.toArray(new ParamTag[found.length()]);
}
/**
* Return see also tags in this comment.
*/
SeeTag[] seeTags() {
ListBuffer<SeeTag> found = new ListBuffer();
for (Tag next : tagList) {
if (next instanceof SeeTag) {
found.append((SeeTag)next);
}
}
return found.toArray(new SeeTag[found.length()]);
}
/**
* Return serialField tags in this comment.
*/
SerialFieldTag[] serialFieldTags() {
ListBuffer<SerialFieldTag> found = new ListBuffer();
for (Tag next : tagList) {
if (next instanceof SerialFieldTag) {
found.append((SerialFieldTag)next);
}
}
return found.toArray(new SerialFieldTag[found.length()]);
}
/**
* Return array of tags with text and inline See Tags for a Doc comment.
*/
static Tag[] getInlineTags(DocImpl holder, String inlinetext) {
ListBuffer<Tag> taglist = new ListBuffer();
int delimend = 0, textstart = 0, len = inlinetext.length();
boolean inPre = false;
DocEnv docenv = holder.env;
if (len == 0) {
return taglist.toArray(new Tag[taglist.length()]);
}
while (true) {
int linkstart;
if ((linkstart = inlineTagFound(holder, inlinetext,
textstart)) == -1) {
taglist.append(new TagImpl(holder, "Text",
inlinetext.substring(textstart)));
break;
} else {
inPre = scanForPre(inlinetext, textstart, linkstart, inPre);
int seetextstart = linkstart;
for (int i = linkstart; i < inlinetext.length(); i++) {
char c = inlinetext.charAt(i);
if (Character.isWhitespace(c) ||
c == '}') {
seetextstart = i;
break;
}
}
String linkName = inlinetext.substring(linkstart+2, seetextstart);
if (!(inPre && (linkName.equals("code") || linkName.equals("literal")))) {
//Move past the white space after the inline tag name.
while (Character.isWhitespace(inlinetext.
charAt(seetextstart))) {
if (inlinetext.length() <= seetextstart) {
taglist.append(new TagImpl(holder, "Text",
inlinetext.substring(textstart, seetextstart)));
docenv.warning(holder,
"tag.Improper_Use_Of_Link_Tag",
inlinetext);
return taglist.toArray(new Tag[taglist.length()]);
} else {
seetextstart++;
}
}
}
taglist.append(new TagImpl(holder, "Text",
inlinetext.substring(textstart, linkstart)));
textstart = seetextstart; // this text is actually seetag
if ((delimend = findInlineTagDelim(inlinetext, textstart)) == -1) {
//Missing closing '}' character.
// store the text as it is with the {@link.
taglist.append(new TagImpl(holder, "Text",
inlinetext.substring(textstart)));
docenv.warning(holder,
"tag.End_delimiter_missing_for_possible_SeeTag",
inlinetext);
return taglist.toArray(new Tag[taglist.length()]);
} else {
//Found closing '}' character.
if (linkName.equals("see")
|| linkName.equals("link")
|| linkName.equals("linkplain")) {
taglist.append( new SeeTagImpl(holder, "@" + linkName,
inlinetext.substring(textstart, delimend)));
} else {
taglist.append( new TagImpl(holder, "@" + linkName,
inlinetext.substring(textstart, delimend)));
}
textstart = delimend + 1;
}
}
if (textstart == inlinetext.length()) {
break;
}
}
return taglist.toArray(new Tag[taglist.length()]);
}
/** regex for case-insensitive match for {@literal <pre> } and {@literal }. */
private static final Pattern prePat = Pattern.compile("(?i)<(/?)pre>");
private static boolean scanForPre(String inlinetext, int start, int end, boolean inPre) {
Matcher m = prePat.matcher(inlinetext).region(start, end);
while (m.find()) {
inPre = m.group(1).isEmpty();
}
return inPre;
}
/**
* Recursively find the index of the closing '}' character for an inline tag
* and return it. If it can't be found, return -1.
* @param inlineText the text to search in.
* @param searchStart the index of the place to start searching at.
* @return the index of the closing '}' character for an inline tag.
* If it can't be found, return -1.
*/
private static int findInlineTagDelim(String inlineText, int searchStart) {
int delimEnd, nestedOpenBrace;
if ((delimEnd = inlineText.indexOf("}", searchStart)) == -1) {
return -1;
} else if (((nestedOpenBrace = inlineText.indexOf("{", searchStart)) != -1) &&
nestedOpenBrace < delimEnd){
//Found a nested open brace.
int nestedCloseBrace = findInlineTagDelim(inlineText, nestedOpenBrace + 1);
return (nestedCloseBrace != -1) ?
findInlineTagDelim(inlineText, nestedCloseBrace + 1) :
-1;
} else {
return delimEnd;
}
}
/**
* Recursively search for the characters '{', '@', followed by
* name of inline tag and white space,
* if found
* return the index of the text following the white space.
* else
* return -1.
*/
private static int inlineTagFound(DocImpl holder, String inlinetext, int start) {
DocEnv docenv = holder.env;
int linkstart = inlinetext.indexOf("{@", start);
if (start == inlinetext.length() || linkstart == -1) {
return -1;
} else if (inlinetext.indexOf('}', linkstart) == -1) {
//Missing '}'.
docenv.warning(holder, "tag.Improper_Use_Of_Link_Tag",
inlinetext.substring(linkstart, inlinetext.length()));
return -1;
} else {
return linkstart;
}
}
/**
* Return array of tags for the locale specific first sentence in the text.
*/
static Tag[] firstSentenceTags(DocImpl holder, String text) {
DocLocale doclocale = holder.env.doclocale;
return getInlineTags(holder,
doclocale.localeSpecificFirstSentence(holder, text));
}
/**
* Return text for this Doc comment.
*/
@Override
public String toString() {
return text;
}
}
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