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FileContents.java
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FileContents.java
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////////////////////////////////////////////////////////////////////////////////
// checkstyle: Checks Java source code for adherence to a set of rules.
// Copyright (C) 2001-2013 Oliver Burn
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
//
// This library 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
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
////////////////////////////////////////////////////////////////////////////////
package com.puppycrawl.tools.checkstyle.api;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.Lists;
import com.google.common.collect.Maps;
import com.puppycrawl.tools.checkstyle.grammars.CommentListener;
import java.io.File;
import java.util.Arrays;
import java.util.Collection;
import java.util.List;
import java.util.Map;
import java.util.regex.Pattern;
/**
* Represents the contents of a file.
*
* @author Oliver Burn
* @version 1.0
*/
public final class FileContents implements CommentListener
{
/**
* the pattern to match a single line comment containing only the comment
* itself -- no code.
*/
private static final String MATCH_SINGLELINE_COMMENT_PAT = "^\\s*//.*$";
/** compiled regexp to match a single-line comment line */
private static final Pattern MATCH_SINGLELINE_COMMENT = Pattern
.compile(MATCH_SINGLELINE_COMMENT_PAT);
/** the file name */
private final String mFilename;
/** the text */
private final FileText mText;
/** map of the Javadoc comments indexed on the last line of the comment.
* The hack is it assumes that there is only one Javadoc comment per line.
*/
private final Map<Integer, TextBlock> mJavadocComments = Maps.newHashMap();
/** map of the C++ comments indexed on the first line of the comment. */
private final Map<Integer, TextBlock> mCPlusPlusComments =
Maps.newHashMap();
/**
* map of the C comments indexed on the first line of the comment to a list
* of comments on that line
*/
private final Map<Integer, List<TextBlock>> mCComments = Maps.newHashMap();
/**
* Creates a new <code>FileContents</code> instance.
*
* @param aFilename name of the file
* @param aLines the contents of the file
* @deprecated Use {@link #FileContents(FileText)} instead
* in order to preserve the original line breaks where possible.
*/
@Deprecated public FileContents(String aFilename, String[] aLines)
{
mFilename = aFilename;
mText = FileText.fromLines(new File(aFilename), Arrays.asList(aLines));
}
/**
* Creates a new <code>FileContents</code> instance.
*
* @param aText the contents of the file
*/
public FileContents(FileText aText)
{
mFilename = aText.getFile().toString();
mText = aText;
}
/** {@inheritDoc} */
public void reportSingleLineComment(String aType, int aStartLineNo,
int aStartColNo)
{
reportCppComment(aStartLineNo, aStartColNo);
}
/** {@inheritDoc} */
public void reportBlockComment(String aType, int aStartLineNo,
int aStartColNo, int aEndLineNo, int aEndColNo)
{
reportCComment(aStartLineNo, aStartColNo, aEndLineNo, aEndColNo);
}
/**
* Report the location of a C++ style comment.
* @param aStartLineNo the starting line number
* @param aStartColNo the starting column number
**/
public void reportCppComment(int aStartLineNo, int aStartColNo)
{
final String line = line(aStartLineNo - 1);
final String[] txt = new String[] {line.substring(aStartColNo)};
final Comment comment = new Comment(txt, aStartColNo, aStartLineNo,
line.length() - 1);
mCPlusPlusComments.put(aStartLineNo, comment);
}
/**
* Returns a map of all the C++ style comments. The key is a line number,
* the value is the comment {@link TextBlock} at the line.
* @return the Map of comments
*/
public ImmutableMap<Integer, TextBlock> getCppComments()
{
return ImmutableMap.copyOf(mCPlusPlusComments);
}
/**
* Report the location of a C-style comment.
* @param aStartLineNo the starting line number
* @param aStartColNo the starting column number
* @param aEndLineNo the ending line number
* @param aEndColNo the ending column number
**/
public void reportCComment(int aStartLineNo, int aStartColNo,
int aEndLineNo, int aEndColNo)
{
final String[] cc = extractCComment(aStartLineNo, aStartColNo,
aEndLineNo, aEndColNo);
final Comment comment = new Comment(cc, aStartColNo, aEndLineNo,
aEndColNo);
// save the comment
if (mCComments.containsKey(aStartLineNo)) {
final List<TextBlock> entries = mCComments.get(aStartLineNo);
entries.add(comment);
}
else {
final List<TextBlock> entries = Lists.newArrayList();
entries.add(comment);
mCComments.put(aStartLineNo, entries);
}
// Remember if possible Javadoc comment
if (line(aStartLineNo - 1).indexOf("/**", aStartColNo) != -1) {
mJavadocComments.put(aEndLineNo - 1, comment);
}
}
/**
* Returns a map of all C style comments. The key is the line number, the
* value is a {@link List} of C style comment {@link TextBlock}s
* that start at that line.
* @return the map of comments
*/
public ImmutableMap<Integer, List<TextBlock>> getCComments()
{
return ImmutableMap.copyOf(mCComments);
}
/**
* Returns the specified C comment as a String array.
* @return C comment as a array
* @param aStartLineNo the starting line number
* @param aStartColNo the starting column number
* @param aEndLineNo the ending line number
* @param aEndColNo the ending column number
**/
private String[] extractCComment(int aStartLineNo, int aStartColNo,
int aEndLineNo, int aEndColNo)
{
String[] retVal;
if (aStartLineNo == aEndLineNo) {
retVal = new String[1];
retVal[0] = line(aStartLineNo - 1).substring(aStartColNo,
aEndColNo + 1);
}
else {
retVal = new String[aEndLineNo - aStartLineNo + 1];
retVal[0] = line(aStartLineNo - 1).substring(aStartColNo);
for (int i = aStartLineNo; i < aEndLineNo; i++) {
retVal[i - aStartLineNo + 1] = line(i);
}
retVal[retVal.length - 1] = line(aEndLineNo - 1).substring(0,
aEndColNo + 1);
}
return retVal;
}
/**
* Returns the Javadoc comment before the specified line.
* A return value of <code>null</code> means there is no such comment.
* @return the Javadoc comment, or <code>null</code> if none
* @param aLineNo the line number to check before
**/
public TextBlock getJavadocBefore(int aLineNo)
{
// Lines start at 1 to the callers perspective, so need to take off 2
int lineNo = aLineNo - 2;
// skip blank lines
while ((lineNo > 0) && (lineIsBlank(lineNo) || lineIsComment(lineNo))) {
lineNo--;
}
return mJavadocComments.get(lineNo);
}
/**
* Get a single line.
* For internal use only, as getText().get(lineNo) is just as
* suitable for external use and avoids method duplication.
* @param aLineNo the number of the line to get
* @return the corresponding line, without terminator
* @throws IndexOutOfBoundsException if lineNo is invalid
*/
private String line(int aLineNo)
{
return mText.get(aLineNo);
}
/**
* Get the full text of the file.
* @return an object containing the full text of the file
*/
public FileText getText()
{
return mText;
}
/** @return the lines in the file */
public String[] getLines()
{
return mText.toLinesArray();
}
/** @return the name of the file */
public String getFilename()
{
return mFilename;
}
/**
* Checks if the specified line is blank.
* @param aLineNo the line number to check
* @return if the specified line consists only of tabs and spaces.
**/
public boolean lineIsBlank(int aLineNo)
{
// possible improvement: avoid garbage creation in trim()
return "".equals(line(aLineNo).trim());
}
/**
* Checks if the specified line is a single-line comment without code.
* @param aLineNo the line number to check
* @return if the specified line consists of only a single line comment
* without code.
**/
public boolean lineIsComment(int aLineNo)
{
return MATCH_SINGLELINE_COMMENT.matcher(line(aLineNo)).matches();
}
/**
* Checks if the specified position intersects with a comment.
* @param aStartLineNo the starting line number
* @param aStartColNo the starting column number
* @param aEndLineNo the ending line number
* @param aEndColNo the ending column number
* @return true if the positions intersects with a comment.
**/
public boolean hasIntersectionWithComment(int aStartLineNo,
int aStartColNo, int aEndLineNo, int aEndColNo)
{
// Check C comments (all comments should be checked)
final Collection<List<TextBlock>> values = mCComments.values();
for (final List<TextBlock> row : values) {
for (final TextBlock comment : row) {
if (comment.intersects(aStartLineNo, aStartColNo, aEndLineNo,
aEndColNo))
{
return true;
}
}
}
// Check CPP comments (line searching is possible)
for (int lineNumber = aStartLineNo; lineNumber <= aEndLineNo;
lineNumber++)
{
final TextBlock comment = mCPlusPlusComments.get(lineNumber);
if ((comment != null)
&& comment.intersects(aStartLineNo, aStartColNo,
aEndLineNo, aEndColNo))
{
return true;
}
}
return false;
}
/**
* Checks if the current file is a package-info.java file.
* @return true if the package file.
*/
public boolean inPackageInfo()
{
return this.getFilename().endsWith("package-info.java");
}
}