/**
* Appends comment nodes to existing AST. It traverses each node in AST, looks for hidden comment
* tokens and appends found comment tokens as nodes in AST.
*
* @param root root of AST.
* @return root of AST with comment nodes.
*/
private static DetailAST appendHiddenCommentNodes(DetailAST root) {
DetailAST result = root;
DetailAST curNode = root;
DetailAST lastNode = root;
while (curNode != null) {
if (isPositionGreater(curNode, lastNode)) {
lastNode = curNode;
}
CommonHiddenStreamToken tokenBefore = curNode.getHiddenBefore();
DetailAST currentSibling = curNode;
while (tokenBefore != null) {
final DetailAST newCommentNode = createCommentAstFromToken(tokenBefore);
currentSibling.addPreviousSibling(newCommentNode);
if (currentSibling == result) {
result = newCommentNode;
}
currentSibling = newCommentNode;
tokenBefore = tokenBefore.getHiddenBefore();
}
DetailAST toVisit = curNode.getFirstChild();
while (curNode != null && toVisit == null) {
toVisit = curNode.getNextSibling();
if (toVisit == null) {
curNode = curNode.getParent();
}
}
curNode = toVisit;
}
if (lastNode != null) {
CommonHiddenStreamToken tokenAfter = lastNode.getHiddenAfter();
DetailAST currentSibling = lastNode;
while (tokenAfter != null) {
final DetailAST newCommentNode = createCommentAstFromToken(tokenAfter);
currentSibling.addNextSibling(newCommentNode);
currentSibling = newCommentNode;
tokenAfter = tokenAfter.getHiddenAfter();
}
}
return result;
}
private String debugHiddenBefore(AST ast) {
if (!(ast instanceof antlr.CommonASTWithHiddenTokens)) {
return "";
}
antlr.CommonHiddenStreamToken parent =
((antlr.CommonASTWithHiddenTokens) ast).getHiddenBefore();
if (parent == null) {
return "";
}
antlr.CommonHiddenStreamToken child = null;
do {
child = parent;
parent = child.getHiddenBefore();
} while (parent != null);
return debugHiddenTokens(child);
}
private String debugHiddenTokens(antlr.CommonHiddenStreamToken t) {
final StringBuilder sb = new StringBuilder();
for (; t != null; t = filter.getHiddenAfter(t)) {
if (sb.length() == 0) {
sb.append("[");
}
sb.append(t.getText().replace("\n", "\\n"));
}
if (sb.length() > 0) {
sb.append("]");
}
return sb.toString();
}