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#include <cassert>
#include <sstream>
#include "yaml-cpp/emitfromevents.h"
#include "yaml-cpp/emitter.h"
#include "yaml-cpp/emittermanip.h"
#include "yaml-cpp/null.h"
namespace YAML {
struct Mark;
} // namespace YAML
namespace {
std::string ToString(YAML::anchor_t anchor) {
std::stringstream stream;
stream << anchor;
return stream.str();
}
}
namespace YAML {
EmitFromEvents::EmitFromEvents(Emitter& emitter) : m_emitter(emitter) {}
void EmitFromEvents::OnDocumentStart(const Mark&) {}
void EmitFromEvents::OnDocumentEnd() {}
void EmitFromEvents::OnNull(const Mark&, anchor_t anchor) {
BeginNode();
EmitProps("", anchor);
m_emitter << Null;
}
void EmitFromEvents::OnAlias(const Mark&, anchor_t anchor) {
BeginNode();
m_emitter << Alias(ToString(anchor));
}
void EmitFromEvents::OnScalar(const Mark&, const std::string& tag,
anchor_t anchor, const std::string& value) {
BeginNode();
EmitProps(tag, anchor);
m_emitter << value;
}
void EmitFromEvents::OnSequenceStart(const Mark&, const std::string& tag,
anchor_t anchor,
EmitterStyle::value style) {
BeginNode();
EmitProps(tag, anchor);
switch (style) {
case EmitterStyle::Block:
m_emitter << Block;
break;
case EmitterStyle::Flow:
m_emitter << Flow;
break;
default:
break;
}
m_emitter << BeginSeq;
m_stateStack.push(State::WaitingForSequenceEntry);
}
void EmitFromEvents::OnSequenceEnd() {
m_emitter << EndSeq;
assert(m_stateStack.top() == State::WaitingForSequenceEntry);
m_stateStack.pop();
}
void EmitFromEvents::OnMapStart(const Mark&, const std::string& tag,
anchor_t anchor, EmitterStyle::value style) {
BeginNode();
EmitProps(tag, anchor);
switch (style) {
case EmitterStyle::Block:
m_emitter << Block;
break;
case EmitterStyle::Flow:
m_emitter << Flow;
break;
default:
break;
}
m_emitter << BeginMap;
m_stateStack.push(State::WaitingForKey);
}
void EmitFromEvents::OnMapEnd() {
m_emitter << EndMap;
assert(m_stateStack.top() == State::WaitingForKey);
m_stateStack.pop();
}
void EmitFromEvents::BeginNode() {
if (m_stateStack.empty())
return;
switch (m_stateStack.top()) {
case State::WaitingForKey:
m_emitter << Key;
m_stateStack.top() = State::WaitingForValue;
break;
case State::WaitingForValue:
m_emitter << Value;
m_stateStack.top() = State::WaitingForKey;
break;
default:
break;
}
}
void EmitFromEvents::EmitProps(const std::string& tag, anchor_t anchor) {
if (!tag.empty() && tag != "?" && tag != "!")
m_emitter << VerbatimTag(tag);
if (anchor)
m_emitter << Anchor(ToString(anchor));
}
}
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