com.qulice.checkstyle.JavadocLocationCheck Maven / Gradle / Ivy
/*
* Copyright (c) 2011-2019, Qulice.com
* All rights reserved.
*
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* modification, are permitted provided that the following conditions
* are met: 1) Redistributions of source code must retain the above
* copyright notice, this list of conditions and the following
* disclaimer. 2) Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
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* the names of its contributors may be used to endorse or promote
* products derived from this software without specific prior written
* permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT
* NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
* FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package com.qulice.checkstyle;
import com.puppycrawl.tools.checkstyle.api.AbstractCheck;
import com.puppycrawl.tools.checkstyle.api.DetailAST;
import com.puppycrawl.tools.checkstyle.api.TokenTypes;
/**
* Checks that there is no empty line between a javadoc and it's subject.
*
* You can't have empty lines between javadoc block and
* a class/method/variable. They should stay together, always.
*
* @since 0.3
*/
public final class JavadocLocationCheck extends AbstractCheck {
@Override
public int[] getDefaultTokens() {
return new int[] {
TokenTypes.CLASS_DEF,
TokenTypes.INTERFACE_DEF,
TokenTypes.VARIABLE_DEF,
TokenTypes.CTOR_DEF,
TokenTypes.METHOD_DEF,
};
}
@Override
public int[] getAcceptableTokens() {
return this.getDefaultTokens();
}
@Override
public int[] getRequiredTokens() {
return this.getDefaultTokens();
}
@Override
public void visitToken(final DetailAST ast) {
if (JavadocLocationCheck.isField(ast)) {
final int current = ast.getLineNo();
final int end = JavadocLocationCheck.findCommentEnd(
this.getLines(), current
);
if (end > JavadocLocationCheck.getCommentMinimum(ast)) {
this.report(current, end);
}
}
}
/**
* Report empty lines between current and end line.
* @param current Current line
* @param end Final line
*/
private void report(final int current, final int end) {
final int diff = current - end;
if (diff > 1) {
for (int pos = 1; pos < diff; pos += 1) {
this.log(
end + pos,
"Empty line between javadoc and subject"
);
}
}
}
/**
* Returns mimimum line number of the end of the comment.
* @param node Node to be checked for Java docs.
* @return Mimimum line number of the end of the comment.
*/
private static int getCommentMinimum(final DetailAST node) {
int minimum = 0;
final DetailAST parent = node.getParent();
if (null == parent) {
if (!JavadocLocationCheck.isFirst(node)) {
final DetailAST object = node
.getPreviousSibling()
.findFirstToken(TokenTypes.OBJBLOCK);
// @checkstyle NestedIfDepth (1 line)
if (object != null) {
minimum = object.getLastChild().getLineNo();
}
}
} else {
DetailAST previous = node.getPreviousSibling();
if (null == previous) {
previous = parent;
}
minimum = previous.getLineNo();
}
return minimum;
}
/**
* Checks the specified node: is it first element or not.
* @param node Node to be checked.
* @return True if there are no any nodes before this one, else -
* {@code false}.
*/
private static boolean isFirst(final DetailAST node) {
final DetailAST previous = node.getPreviousSibling();
return null == previous;
}
/**
* Returns {@code TRUE} if a specified node is something that should have
* a Javadoc, which includes classes, interface, class methods, and
* class variables.
* @param node Node to check
* @return Is it a Javadoc-required entity?
*/
private static boolean isField(final DetailAST node) {
boolean yes = true;
if (TokenTypes.VARIABLE_DEF == node.getType()) {
yes = TokenTypes.OBJBLOCK == node.getParent().getType();
}
return yes;
}
/**
* Find javadoc ending comment.
* @param lines List of lines to check.
* @param start Start searching from this line number.
* @return Line number with found ending comment, or -1 if it wasn't found.
*/
private static int findCommentEnd(final String[] lines, final int start) {
return JavadocLocationCheck.findTrimmedTextUp(lines, start, "*/");
}
/**
* Find a text in lines, by going up.
* @param lines List of lines to check.
* @param start Start searching from this line number.
* @param text Text to find.
* @return Line number with found text, or -1 if it wasn't found.
*/
private static int findTrimmedTextUp(final String[] lines,
final int start, final String text) {
int found = -1;
for (int pos = start - 1; pos >= 0; pos -= 1) {
if (lines[pos].trim().equals(text)) {
found = pos + 1;
break;
}
}
return found;
}
}