json-validator/include/jvalidate/validator.h

#pragma once

#include <regex>
#include <unordered_map>

#include <jvalidate/forward.h>
#include <jvalidate/status.h>
#include <jvalidate/validation_config.h>
#include <jvalidate/validation_visitor.h>

namespace jvalidate::detail {
class StdRegexEngine {
public:
  std::regex regex_;

public:
  StdRegexEngine(std::string const & regex) : regex_(detail::regex_escape(regex)) {}
  bool search(std::string const & text) const { return std::regex_search(text, regex_); }

  static bool is_valid(std::string const & regex) {
    try {
      std::regex{regex};
      return true;
    } catch (...) { return false; }
  }
};
}

namespace jvalidate {
template <RegexEngine RE = detail::StdRegexEngine> class ValidatorT {
private:
  schema::Node const & schema_;
  ValidationConfig cfg_;
  std::unordered_map<std::string, RE> regex_cache_;

public:
  ValidatorT(schema::Node const & schema, ValidationConfig const & cfg = {})
      : schema_(schema), cfg_(cfg) {}

  template <Adapter A>
  requires(not MutableAdapter<A>) bool validate(A const & json,
                                                ValidationResult * result = nullptr) {
    EXPECT_M(not cfg_.construct_default_values,
             "Cannot perform mutations on an immutable JSON Adapter");
    return static_cast<bool>(
        ValidationVisitor<A, RE>(json, schema_, cfg_, regex_cache_, result).validate());
  }

  template <MutableAdapter A> bool validate(A const & json, ValidationResult * result = nullptr) {
    return static_cast<bool>(
        ValidationVisitor<A, RE>(json, schema_, cfg_, regex_cache_, result).validate());
  }

  template <typename JSON>
  requires(not Adapter<JSON>) bool validate(JSON & json, ValidationResult * result = nullptr) {
    return validate(adapter::AdapterFor<JSON>(json), result);
  }
};

class Validator : public ValidatorT<> {
public:
  using Validator::ValidatorT::ValidatorT;
};
}