json: Add new module

Only has methods for writing JSON for now.
Will let you create invalid json, but should assert if you do.

1 files changed, 46 insertions, 0 deletions

diff --git a/src/json.hh b/src/json.hh
new file mode 100644
index 0000000..d872dde
--- /dev/null
+++ b/src/json.hh
@@ -0,0 +1,46 @@
+#ifndef JSON_HH
+#define JSON_HH
+
+#include <cstdint>
+#include <iosfwd>
+#include <memory>
+#include <string>
+#include <string_view>
+
+namespace json {
+
+class Writer {
+ public:
+  virtual ~Writer() = default;
+
+  virtual void value(std::string_view value) = 0;
+  virtual void value(int64_t value) = 0;
+  virtual void value(uint64_t value) = 0;
+  virtual void value(float value) = 0;
+  virtual void value(double value) = 0;
+  virtual void value(bool value) = 0;
+
+  void value(char const* value);
+  void value(int value);
+
+  virtual void start_array() = 0;
+  virtual void end_array() = 0;
+
+  virtual void start_object() = 0;
+  virtual void key(std::string_view name) = 0;
+  virtual void end_object() = 0;
+
+  virtual void clear() = 0;
+
+ protected:
+  Writer() = default;
+  Writer(Writer const&) = delete;
+  Writer& operator=(Writer const&) = delete;
+};
+
+std::unique_ptr<Writer> writer(std::string& out);
+std::unique_ptr<Writer> writer(std::ostream& out);
+
+}  // namespace json
+
+#endif  // JSON_HH