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#include <cassert>
#include "nodebuilder.h"
#include "yaml-cpp/node/detail/node.h"
#include "yaml-cpp/node/impl.h"
#include "yaml-cpp/node/node.h"
#include "yaml-cpp/node/type.h"
namespace YAML {
struct Mark;
NodeBuilder::NodeBuilder()
: m_pMemory(new detail::memory_holder),
m_pRoot(nullptr),
m_stack{},
m_anchors{},
m_keys{},
m_mapDepth(0) {
m_anchors.push_back(nullptr); // since the anchors start at 1
}
NodeBuilder::~NodeBuilder() = default;
Node NodeBuilder::Root() {
if (!m_pRoot)
return Node();
return Node(*m_pRoot, m_pMemory);
}
void NodeBuilder::OnDocumentStart(const Mark&) {}
void NodeBuilder::OnDocumentEnd() {}
void NodeBuilder::OnNull(const Mark& mark, anchor_t anchor) {
detail::node& node = Push(mark, anchor);
node.set_null();
Pop();
}
void NodeBuilder::OnAlias(const Mark& /* mark */, anchor_t anchor) {
detail::node& node = *m_anchors[anchor];
Push(node);
Pop();
}
void NodeBuilder::OnScalar(const Mark& mark, const std::string& tag,
anchor_t anchor, const std::string& value) {
detail::node& node = Push(mark, anchor);
node.set_scalar(value);
node.set_tag(tag);
Pop();
}
void NodeBuilder::OnSequenceStart(const Mark& mark, const std::string& tag,
anchor_t anchor, EmitterStyle::value style) {
detail::node& node = Push(mark, anchor);
node.set_tag(tag);
node.set_type(NodeType::Sequence);
node.set_style(style);
}
void NodeBuilder::OnSequenceEnd() { Pop(); }
void NodeBuilder::OnMapStart(const Mark& mark, const std::string& tag,
anchor_t anchor, EmitterStyle::value style) {
detail::node& node = Push(mark, anchor);
node.set_type(NodeType::Map);
node.set_tag(tag);
node.set_style(style);
m_mapDepth++;
}
void NodeBuilder::OnMapEnd() {
assert(m_mapDepth > 0);
m_mapDepth--;
Pop();
}
detail::node& NodeBuilder::Push(const Mark& mark, anchor_t anchor) {
detail::node& node = m_pMemory->create_node();
node.set_mark(mark);
RegisterAnchor(anchor, node);
Push(node);
return node;
}
void NodeBuilder::Push(detail::node& node) {
const bool needsKey =
(!m_stack.empty() && m_stack.back()->type() == NodeType::Map &&
m_keys.size() < m_mapDepth);
m_stack.push_back(&node);
if (needsKey)
m_keys.emplace_back(&node, false);
}
void NodeBuilder::Pop() {
assert(!m_stack.empty());
if (m_stack.size() == 1) {
m_pRoot = m_stack[0];
m_stack.pop_back();
return;
}
detail::node& node = *m_stack.back();
m_stack.pop_back();
detail::node& collection = *m_stack.back();
if (collection.type() == NodeType::Sequence) {
collection.push_back(node, m_pMemory);
} else if (collection.type() == NodeType::Map) {
assert(!m_keys.empty());
PushedKey& key = m_keys.back();
if (key.second) {
collection.insert(*key.first, node, m_pMemory);
m_keys.pop_back();
} else {
key.second = true;
}
} else {
assert(false);
m_stack.clear();
}
}
void NodeBuilder::RegisterAnchor(anchor_t anchor, detail::node& node) {
if (anchor) {
assert(anchor == m_anchors.size());
m_anchors.push_back(&node);
}
}
} // namespace YAML
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