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increase and decrease depth properly on subhandlers

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the original implementation couldn't parse a document with more than
depth_limit entries. now we explicitly increase *and* decrease the
depth on specific handlers like maps, sequences and so on - any
handler that may in turn callback into HandleNode().

this is a little clunky - I would have prefered to increment and
decrement the counter in only one place, but there are many different
return points and this is not Golang so I can't think of a better way
to to this.
This commit is contained in:
Antoine Beaupré 2017-04-26 10:39:45 -04:00 committed by Alan Griffiths
parent 099fb7b8d5
commit 6c5081b364
1 changed files with 12 additions and 1 deletions
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13
src/singledocparser.cpp
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@ -50,7 +50,6 @@ void SingleDocParser::HandleNode(EventHandler& eventHandler) {
if (depth > depth_limit) {
throw ParserException(m_scanner.mark(), ErrorMsg::BAD_FILE);
}
depth++;
// an empty node *is* a possibility
if (m_scanner.empty()) {
eventHandler.OnNull(m_scanner.mark(), NullAnchor);
@ -62,9 +61,11 @@ void SingleDocParser::HandleNode(EventHandler& eventHandler) {
// special case: a value node by itself must be a map, with no header
if (m_scanner.peek().type == Token::VALUE) {
depth++;
eventHandler.OnMapStart(mark, "?", NullAnchor, EmitterStyle::Default);
HandleMap(eventHandler);
eventHandler.OnMapEnd();
depth--;
return;
}
@ -109,32 +110,42 @@ void SingleDocParser::HandleNode(EventHandler& eventHandler) {
m_scanner.pop();
return;
case Token::FLOW_SEQ_START:
depth++;
eventHandler.OnSequenceStart(mark, tag, anchor, EmitterStyle::Flow);
HandleSequence(eventHandler);
eventHandler.OnSequenceEnd();
depth--;
return;
case Token::BLOCK_SEQ_START:
depth++;
eventHandler.OnSequenceStart(mark, tag, anchor, EmitterStyle::Block);
HandleSequence(eventHandler);
eventHandler.OnSequenceEnd();
depth--;
return;
case Token::FLOW_MAP_START:
depth++;
eventHandler.OnMapStart(mark, tag, anchor, EmitterStyle::Flow);
HandleMap(eventHandler);
eventHandler.OnMapEnd();
depth--;
return;
case Token::BLOCK_MAP_START:
depth++;
eventHandler.OnMapStart(mark, tag, anchor, EmitterStyle::Block);
HandleMap(eventHandler);
eventHandler.OnMapEnd();
depth--;
return;
case Token::KEY:
// compact maps can only go in a flow sequence
if (m_pCollectionStack->GetCurCollectionType() ==
CollectionType::FlowSeq) {
depth++;
eventHandler.OnMapStart(mark, tag, anchor, EmitterStyle::Flow);
HandleMap(eventHandler);
eventHandler.OnMapEnd();
depth--;
return;
}
break;