Implemented (untested) the value builder

src/value/valuebuilder.cpp

@@ -0,0 +1,120 @@
+#include "valuebuilder.h"
+#include "yaml-cpp/mark.h"
+#include "yaml-cpp/value.h"
+#include <cassert>
+
+namespace YAML
+{
+	ValueBuilder::ValueBuilder(): m_pMemory(new detail::memory_holder), m_pRoot(0), m_mapDepth(0)
+	{
+		m_anchors.push_back(0); // since the anchors start at 1
+	}
+	
+	ValueBuilder::~ValueBuilder()
+	{
+	}
+	
+	void ValueBuilder::OnDocumentStart(const Mark&)
+	{
+	}
+	
+	void ValueBuilder::OnDocumentEnd()
+	{
+	}
+	
+	void ValueBuilder::OnNull(const Mark& mark, anchor_t anchor)
+	{
+		detail::node& node = Push(anchor);
+		node.set_null();
+		Pop();
+	}
+	
+	void ValueBuilder::OnAlias(const Mark& /*mark*/, anchor_t anchor)
+	{
+		detail::node& node = *m_anchors[anchor];
+		m_stack.push_back(&node);
+		Pop();
+	}
+	
+	void ValueBuilder::OnScalar(const Mark& mark, const std::string& tag, anchor_t anchor, const std::string& value)
+	{
+		detail::node& node = Push(anchor);
+		node.set_scalar(value);
+		Pop();
+	}
+	
+	void ValueBuilder::OnSequenceStart(const Mark& mark, const std::string& tag, anchor_t anchor)
+	{
+		detail::node& node = Push(anchor);
+		node.set_type(ValueType::Sequence);
+	}
+	
+	void ValueBuilder::OnSequenceEnd()
+	{
+		Pop();
+	}
+	
+	void ValueBuilder::OnMapStart(const Mark& mark, const std::string& tag, anchor_t anchor)
+	{
+		detail::node& node = Push(anchor);
+		node.set_type(ValueType::Map);
+		m_mapDepth++;
+	}
+	
+	void ValueBuilder::OnMapEnd()
+	{
+		assert(m_mapDepth > 0);
+		m_mapDepth--;
+		Pop();
+	}
+
+	detail::node& ValueBuilder::Push(anchor_t anchor)
+	{
+		detail::node& top = *m_stack.back();
+		
+		detail::node& node = m_pMemory->create_node();
+		m_stack.push_back(&node);
+		RegisterAnchor(anchor, node);
+		
+		if(top.type() == ValueType::Map && m_keys.size() < m_mapDepth)
+			m_keys.push_back(&node);
+		
+		return node;
+	}
+	
+	void ValueBuilder::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() == ValueType::Sequence) {
+			collection.append(node, m_pMemory);
+		} else if(collection.type() == ValueType::Map) {
+			detail::node& key = *m_keys.back();
+			if(&key != &node) {
+				m_keys.pop_back();
+				collection.insert(key, node, m_pMemory);
+			}
+		} else {
+			assert(false);
+			m_stack.clear();
+		}
+	}
+
+	void ValueBuilder::RegisterAnchor(anchor_t anchor, detail::node& node)
+	{
+		if(anchor) {
+			assert(anchor == m_anchors.size());
+			m_anchors.push_back(&node);
+		}
+	}
+}