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// Copyright 2014 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef TOOLS_BLINK_GC_PLUGIN_JSON_WRITER_H_
#define TOOLS_BLINK_GC_PLUGIN_JSON_WRITER_H_
#include <memory>
#include <stack>
#include "llvm/Support/raw_ostream.h"
// Helper to write information for the points-to graph.
class JsonWriter {
public:
static JsonWriter* from(std::unique_ptr<llvm::raw_ostream> os) {
return os ? new JsonWriter(std::move(os)) : 0;
}
void OpenList() {
Separator();
*os_ << "[";
state_.push(false);
}
void OpenList(const std::string& key) {
Write(key);
*os_ << ":";
OpenList();
}
void CloseList() {
*os_ << "]";
state_.pop();
}
void OpenObject() {
Separator();
*os_ << "{";
state_.push(false);
}
void CloseObject() {
*os_ << "}\n";
state_.pop();
}
void Write(const size_t val) {
Separator();
*os_ << val;
}
void Write(const std::string& val) {
Separator();
*os_ << "\"" << Escape(val) << "\"";
}
void Write(const std::string& key, const size_t val) {
Separator();
*os_ << "\"" << Escape(key) << "\":" << val;
}
void Write(const std::string& key, const std::string& val) {
Separator();
*os_ << "\"" << Escape(key) << "\":\"" << Escape(val) << "\"";
}
private:
JsonWriter(std::unique_ptr<llvm::raw_ostream> os) : os_(std::move(os)) {}
void Separator() {
if (state_.empty())
return;
if (state_.top()) {
*os_ << ",";
return;
}
state_.top() = true;
}
std::string Escape(const std::string& s) {
std::string copy = s;
size_t i = 0;
while ((i = copy.find('\\', i)) != std::string::npos) {
copy.replace(i, 1, "\\\\");
i += 2;
}
return copy;
}
std::unique_ptr<llvm::raw_ostream> os_;
std::stack<bool> state_;
};
#endif // TOOLS_BLINK_GC_PLUGIN_JSON_WRITER_H_
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