public CommentsCollection parse(final InputStream in, final String charsetName)
throws IOException, UnsupportedEncodingException {
boolean lastWasASlashR = false;
BufferedReader br = new BufferedReader(new InputStreamReader(in, charsetName));
CommentsCollection comments = new CommentsCollection();
int r;
Deque prevTwoChars = new LinkedList<Character>(Arrays.asList('z', 'z'));
State state = State.CODE;
LineComment currentLineComment = null;
BlockComment currentBlockComment = null;
StringBuffer currentContent = null;
int currLine = 1;
int currCol = 1;
while ((r = br.read()) != -1) {
char c = (char) r;
if (c == '\r') {
lastWasASlashR = true;
} else if (c == '\n' && lastWasASlashR) {
lastWasASlashR = false;
continue;
} else {
lastWasASlashR = false;
}
switch (state) {
case CODE:
if (prevTwoChars.peekLast().equals('/') && c == '/') {
currentLineComment = new LineComment();
currentLineComment.setBeginLine(currLine);
currentLineComment.setBeginColumn(currCol - 1);
state = State.IN_LINE_COMMENT;
currentContent = new StringBuffer();
} else if (prevTwoChars.peekLast().equals('/') && c == '*') {
currentBlockComment = new BlockComment();
currentBlockComment.setBeginLine(currLine);
currentBlockComment.setBeginColumn(currCol - 1);
state = State.IN_BLOCK_COMMENT;
currentContent = new StringBuffer();
} else if (c == '"') {
state = State.IN_STRING;
} else {
// nothing to do
}
break;
case IN_LINE_COMMENT:
if (c == '\n' || c == '\r') {
currentLineComment.setContent(currentContent.toString());
currentLineComment.setEndLine(currLine);
currentLineComment.setEndColumn(currCol);
comments.addComment(currentLineComment);
state = State.CODE;
} else {
currentContent.append(c);
}
break;
case IN_BLOCK_COMMENT:
if (prevTwoChars.peekLast().equals('*')
&& c == '/'
&& !prevTwoChars.peekFirst().equals('/')) {
// delete last character
String content =
currentContent.deleteCharAt(currentContent.toString().length() - 1).toString();
if (content.startsWith("*")) {
JavadocComment javadocComment = new JavadocComment();
javadocComment.setContent(content.substring(1));
javadocComment.setBeginLine(currentBlockComment.getBeginLine());
javadocComment.setBeginColumn(currentBlockComment.getBeginColumn());
javadocComment.setEndLine(currLine);
javadocComment.setEndColumn(currCol + 1);
comments.addComment(javadocComment);
} else {
currentBlockComment.setContent(content);
currentBlockComment.setEndLine(currLine);
currentBlockComment.setEndColumn(currCol + 1);
comments.addComment(currentBlockComment);
}
state = State.CODE;
} else {
currentContent.append(c == '\r' ? '\n' : c);
}
break;
case IN_STRING:
if (!prevTwoChars.peekLast().equals('\\') && c == '"') {
state = State.CODE;
}
break;
default:
throw new RuntimeException("Unexpected");
}
switch (c) {
case '\n':
case '\r':
currLine += 1;
currCol = 1;
break;
case '\t':
currCol += COLUMNS_PER_TAB;
break;
default:
currCol += 1;
}
prevTwoChars.remove();
prevTwoChars.add(c);
}
if (state == State.IN_LINE_COMMENT) {
currentLineComment.setContent(currentContent.toString());
currentLineComment.setEndLine(currLine);
currentLineComment.setEndColumn(currCol);
comments.addComment(currentLineComment);
}
return comments;
}
