com.qulice.checkstyle.CascadeIndentationCheck Maven / Gradle / Ivy
The newest version!
/*
* Copyright (c) 2011-2024 Qulice.com
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* 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
* disclaimer in the documentation and/or other materials provided
* with the distribution. 3) Neither the name of the Qulice.com nor
* 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
* THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* 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.AbstractFileSetCheck;
import com.puppycrawl.tools.checkstyle.api.FileText;
import java.io.File;
import org.cactoos.text.Joined;
/**
* Make sure each line indentation is either:
*
* - the same as previous one or less
*
- bigger than previous by exactly 4
*
* All other cases must cause a failure.
*
* @since 0.3
*/
public final class CascadeIndentationCheck extends AbstractFileSetCheck {
/**
* Exact indentation increase difference.
*/
private static final int LINE_INDENT_DIFF = 4;
@Override
public void processFiltered(final File file, final FileText lines) {
int previous = 0;
for (int pos = 0; pos < lines.size(); pos += 1) {
final String line = lines.get(pos);
final int current = CascadeIndentationCheck.indentation(line);
if (CascadeIndentationCheck.inCommentBlock(line)
|| line.isEmpty()) {
continue;
}
if (current > previous
&& current != previous
+ CascadeIndentationCheck.LINE_INDENT_DIFF) {
this.log(
pos + 1,
String.format(
new Joined(
"",
"Indentation (%d) must be same or ",
"less than previous line (%d), or ",
"bigger by exactly 4"
).toString(),
current,
previous
)
);
}
previous = current;
}
}
/**
* Checks if the line belongs to a comment block.
* @param line Input.
* @return True if the line belongs to a comment block.
*/
private static boolean inCommentBlock(final String line) {
final String trimmed = line.trim();
return !trimmed.isEmpty()
&& (trimmed.charAt(0) == '*'
|| trimmed.startsWith("/*")
|| trimmed.startsWith("*/")
);
}
/**
* Calculates indentation of a line.
* @param line Input line
* @return Indentation of the given line.
*/
private static int indentation(final String line) {
int result = 0;
for (int pos = 0; pos < line.length(); pos += 1) {
if (!Character.isWhitespace(line.charAt(pos))) {
break;
}
result += 1;
}
return result;
}
}