json-validator/include/jvalidate/detail/version.h

#pragma once

#include <map>

#include <jvalidate/detail/expect.h>
#include <jvalidate/enum.h>

namespace jvalidate::detail {
inline schema::Version version(std::string_view url) {
  static std::map<std::string_view, schema::Version> const g_schema_ids{
      {"json-schema.org/draft-04/schema", schema::Version::Draft04},
      {"json-schema.org/draft-06/schema", schema::Version::Draft06},
      {"json-schema.org/draft-07/schema", schema::Version::Draft07},
      {"json-schema.org/draft/2019-09/schema", schema::Version::Draft2019_09},
      {"json-schema.org/draft/2020-12/schema", schema::Version::Draft2020_12},
  };

  if (url.ends_with('#')) {
    url.remove_suffix(1);
  }
  if (url.starts_with("http://") || url.starts_with("https://")) {
    url.remove_prefix(url.find(':') + 3);
  }

  auto it = g_schema_ids.find(url);
  EXPECT_T(it != g_schema_ids.end(), std::invalid_argument, url);
  return it->second;
}

schema::Version version(Adapter auto const & json) {
  EXPECT(json.type() == adapter::Type::Object);
  EXPECT(json.as_object().contains("$schema"));

  auto const & schema = json.as_object()["$schema"];
  EXPECT(schema.type() == adapter::Type::String);

  return version(schema.as_string());
}

schema::Version version(Adapter auto const & json, schema::Version default_version) {
  RETURN_UNLESS(json.type() == adapter::Type::Object, default_version);
  RETURN_UNLESS(json.as_object().contains("$schema"), default_version);

  auto const & schema = json.as_object()["$schema"];
  RETURN_UNLESS(schema.type() == adapter::Type::String, default_version);

  return version(schema.as_string());
}
}