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

#pragma once

#include <string_view>
#include <unordered_map>
#include <unordered_set>

#include <jvalidate/enum.h>
#include <jvalidate/forward.h>

namespace jvalidate::detail {
template <Adapter A> struct ParserContext;
template <Adapter A> class Vocabulary {
public:
  friend class ConstraintFactory<A>;
  using pConstraint = std::unique_ptr<constraint::Constraint>;
  using MakeConstraint = std::function<pConstraint(ParserContext<A> const &)>;

private:
  schema::Version version_;
  std::unordered_map<std::string_view, MakeConstraint> make_;
  std::unordered_set<std::string_view> special_keywords_;

  // TODO(samjaffe): Migrate this back to constraintsfactory
  std::unordered_set<std::string_view> keywords_{"$defs",
                                                 "additionalItems",
                                                 "additionalProperties",
                                                 "allOf",
                                                 "anyOf",
                                                 "definitions",
                                                 "dependencies",
                                                 "dependentSchemas",
                                                 "else",
                                                 "if",
                                                 "items",
                                                 "not",
                                                 "oneOf",
                                                 "patternProperties",
                                                 "prefixItems",
                                                 "properties",
                                                 "then",
                                                 "unevaluatedItems",
                                                 "unevaluatedProperties"};
  std::unordered_set<std::string_view> property_keywords_{
      "$defs",     "definitions", "dependencies", "dependentSchemas", "patternProperties",
      "properties"};
  std::unordered_set<std::string_view> post_constraints_{"unevaluatedItems",
                                                         "unevaluatedProperties"};

public:
  Vocabulary() = default;
  Vocabulary(schema::Version version, std::unordered_map<std::string_view, MakeConstraint> make)
      : version_(version), make_(std::move(make)) {}

  void restrict(std::unordered_set<std::string> const & permitted_keywords) & {
    for (auto it = make_.begin(); it != make_.end();) {
      if (permitted_keywords.contains(std::string(it->first))) {
        ++it;
      } else {
        it = make_.erase(it);
      }
    }
  }

  schema::Version version() const { return version_; }

  /**
   * @brief Is the given "key"word actually a keyword? As in, would
   * I expect to resolve a constraint out of it.
   */
  bool is_keyword(std::string_view word) const {
    return make_.contains(word) && keywords_.contains(word);
  }

  /**
   * @brief Does the given "key"word represent a property object - that is to
   * say, an object containing some number of schemas mapped by arbitrary keys
   */
  bool is_property_keyword(std::string_view word) const {
    return is_keyword(word) && property_keywords_.contains(word);
  }

  bool is_constraint(std::string_view word) const { return make_.contains(word) && make_.at(word); }

  auto constraint(std::string_view word, ParserContext<A> const & context) const {
    return std::make_pair(is_constraint(word) ? make_.at(word)(context) : nullptr,
                          post_constraints_.contains(word));
  }
};
}